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757, Major Modification to a previo, Studies & Reports Studies & Reports �� Y • • Bolton Engineering Corp. �e 4,2 25834 Narbonne Ave.,Suite 210 Lomita,CA 90717 310-325-5580 Fax:310-325-5581 NAL Exceedance Report March 10 2014 Project Information #3 Appaloosa Lane Rolling Hills, Ca 90274 Prepared by: Bolton Engineering Corp. Civil Engineering& Land Surveying 25834 Narbonne Avenue,Suite 210 Lomita, CA 90717 Phone(310) 325-5580 NAL Exceedance Report • • Summary(See Attachment A for Rain event Report) In general,the existing Water Pollution Control Plan (WPCD) along with assigned BMPs are sufficient regarding slope protection,drain inlet protection,and erosion & sediment control.The site rough grading activities have been done since Feb. 5th, 2014,and is currently pending rough grading certificate in order to get a building permit.With that said,the site consists largely bare soil with vegetation that has not fully grown. Visual inspection • Runoff didn't contain non-storm water discharges,odor, or oil sheen. • Site no longer contains construction materials,vehicles,and activities • Slopes were well-dammed with straw wattles. • Drain inlets were well-protected with gravel bags • Silt fences were not installed at the toe of fill slopes. • Temporary construction entrance was not dammed to prevent runoff on to Appaloosa Lane. Reasons for the NAL Exceedance The average turbidity level is 273.5 which is only 23.5 over the NAL.The main reason for the NAL exceedance is largely because the bare-soil slopes that have vegetations that are not fully grown.Once the vegetations are established on the slopes,the turbidity level should come down. Proposed Action (See Attachment B for Erosion Control) • Berm temporary construction driveway @ low point with 3 feet high sand bags to trap sediment,and provide 2.5 feet high sand bag @ 3 sand bag wide opening to allow runoff. • Place sand bag check-dam laterally on concrete terrace with 2-high sand bags every 20 feet. . Monday,March 30,2 ..7:35:52 AM Pacific Daylight Time Subject: RE:Violation Notice-Claim No.7014 0150 0000 7270 7566 Date: Friday, March 27,2015 5:30:46 PM Pacific Daylight Time From: Goya, Harumi@Waterboards<Harumi.Goya@waterboards.ca.gov> To: Michael Wu<mwu@boltonengineering.com> CC: Yolanta Schwartz<ys@cityofrh.net>, Naslund, Lisa<LNASLUND@dpw.lacounty.gov>, Chatman, Wayne<WChatman@dpw.lacounty.gov>, Dan Bolton<dbolton@boltonengineering.com>, sfozoonmehr@gmail.com<sfozoonmehr@gmail.com> Mr. Wu, Your NER has been received. The status of the enforcement action has been changed to "Historical". If you have any questions,feel free to contact me. Thank you, Harumi Goya Engineering Geologist Storm Water Complinace and Enforcement Regional Water Quality Control Board, Los Angeles Region 320 W 4th St,Suite 200 Los Angeles, CA 90013 (213)620-2283 From: Michael Wu [mailto:mwu@boltonengineering.com] Sent: Friday, March 27, 2015 1:40 PM To: Goya, Harumi@Waterboards Cc: ys@cityofrh.net; Naslund, Lisa; Chatman,Wayne; Dan Bolton; sfozoonmehr@gmail.com Subject: Violation Notice- Claim No. 7014 0150 0000 7270 7566 Ms. Harumi Goya, This email is the response to the letter dated March 25, 2015 regarding the NAL Exceedance Report (NER) for the project located at 3 Appaloosa Road, Rolling Hills, CA 90274. The attached NER (Attachment ID: 1241114) is the same as the one that was uploaded in the Ad Hoc Reports Rain Event ID 820004 which was certified received on March 10th, 2014. Please contact me if you have any question. Michael Wu I P.E. C75964 I Q.S.D. #20254 BOLTON ENGINEERING CORP. 25834 Narbonne Ave., Suite 210 Lomita, CA 90717-7224 310-325-5580 I F: 310-325-5581 mwu@hol.tonermineer.inq.com Page 1 of 2 • Monday,March 30,21 :29:05 AM Pacific Daylight Time Subject: FW:Violation Notice-Claim No.7014 0150 0000 7270 7566 Date: Monday, March 30, 2015 8:11:29 AM Pacific Daylight Time From: Lisa Naslund<LNASLUND@dpw.lacounty.gov> To: 'mwu@bottonengineering.com'<mwu@boltonengineering.com>,sfozoonmehr@gmail.com <sfozoonmehr@gmail.com> CC: Yolanta Schwartz<ys@cityofrh.net>,Wayne Chatman<wchatman@dpw.lacounty.gov>, Kit Bagnell<KBAGNELL@dpw.lacounty.gov> Sorry, should have gone through my e-mails completely. Please let us know when these improvements (from your report)will be done so that we can perform an inspection. Proposed Action (See Attachment B for Erosion Control) • Berm temporary construction driveway @ low point with 3 feet high sand bags to trap sediment,and provide 2.5 feet high sand bag @ 3 sand bag wide opening to allow runoff. • Place sand bag check-dam laterally on concrete terrace with 2-high sand bags every 20 feet. Best, Lisa Naslund, PE L.A. County Department of Public Works Building and Safety Division Counter Hours: East LA 8:00-11:30am on Tuesday(323) 881-7030 Lomita 8-11:30 on Thursday(310) 534-3760 LET US KNOW HOW WE'RE DOING! http://dpw.lacounty.gov/go/bsdsurvey From: Michael Wu [mailto:mwu@boltonengineering.com] Sent: Friday, March 27, 2015 1:40 PM To: Harumi.goya@waterboards.ca.gov Cc: ys@cityofrh.net; Lisa Naslund; Wayne Chatman; Dan Bolton; sfozoonmehr@gmail.com Subject: Violation Notice- Claim No. 7014 0150 0000 7270 7566 Ms. Harumi Goya, This email is the response to the letter dated March 25, 2015 regarding the NAL Exceedance Report (NER) for the project located at 3 Appaloosa Road, Rolling Hills, CA 90274. The attached NER (Attachment ID: 1241114) is the same as the one that was uploaded in the Ad Hoc Reports Rain Event ID 820004 which was certified received on March 10th, 2014. Please contact me if you have any question. Michael Wu I P.E. C75964 I O.S.D. t20254 Page 1 of 2 . • • Friday,March 27,2912:10:13 PM Pacific Daylight Time Subject: FW:WDID#419C366900 Date: Friday, March 27, 2015 9:22:12 AM Pacific Daylight Time From: Kathleen McGowan<KMcGowan@Geosyntec.com> To: Yolanta Schwartz<ys@cityofrh.net> Hi Yolanta, This this enforcement letter went out on one of the construction sites in the City which has coverage under the Construction General Permit. It is the owner/contractor's responsibility to respond, but the City is copied due to its oversight of construction projects under the MS4 Permit. May be a good idea to forward to either Willdan or the County inspector who is handling this site so they can check on BMPs next time they are on site for inspections. Kathleen McGowan, P.E. Direct: 714.465.1255 Cell: 310.213.4979 kmcgowanfteosvntec.com From: Kathleen McGowan [mailto:kathleen.enve@verizon.net] Sent: Friday, March 27, 2015 7:06 AM To: Kathleen McGowan Subject: Fwd: WDID#419C366900 Sent from my iPad Begin forwarded message: From: "Aguirre, Valerie@Waterboards" <Valerie.Aguirre@waterboards.ca.gov> Date: March 26, 2015 at 11:12:55 AM PDT To: "gregg@ci.rolling-hills-estates.ca.us" <gregg c..ci.rolling-hills-estates.ca.us>, "kathleen.enve@verizon.net" <kathleen.enve r verizon.net> Cc: "Ejigu, Solomon@Waterboards" <Solomon.Ejigunwaterboards.ca.gov>, "Goya, Harumi@Waterboards" <Harmmi.Govan,waterboards.ca.gov> Subject: WDID#419C366900 The California Regional Quality Control Board for the Los Angeles Region (Regional Board) provides copies of correspondence through e-mail. The attached is your copy of recent correspondence; only the addressee will receive a hard copy. The letter is in Adobe Acrobat PDF format. You can obtain an Acrobat Reader free of charge at http://www.adobe.com/products/acrobat/readstep2.html. Please contact Harmui Goya, at (213) 620-2283 if you have any questions. Valerie Aguirre Page 1 of 2 • • Staff Services Analyst 320 W. 4th Street Los Angeles, CA 90013 (213)'576-6808 vaguirreCa�waterboards.ca.gov Page 2 of 2 110 • r,, j., CAl lr a aM IS "rz' 1t I711 I:i: _ Water Boards Los Angeles Regional Water Quality Control Board March 25,2015 Shahram Fozoonmehr Certified Mail • 28701 Highridge Road Return Receipt Requested Rancho Palos Verdes, CA 90275 Claim No. 7014 0150 0000 1270 7566 REQUEST FOR NAL EXCEEDANCE REPORT: NPDES GENERAL PERMIT FOR STORM WATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY (ORDER NO.2009-0009-DWQ AS AMENDED BY ORDER NO.2010-0014-DWQ AND NO. 2012-0006-DWQ,NPDES NO. CAS000002),WDID#4 19C366900 Dear Shahram Fozoonmehr: The construction site located at 3 Appaloosa Lane in the city of Rolling Hills is subject to the requirements of the NPDES General Permit for Storm Water Discharges associated with Construction and Land Disturbance Activities (Order No. 2009-0009-DWQ as amended by Order No. 2010-0014-DWQ and No. 2012-0006-DWQ, NPDES No. CAS000002) (General Permit)and is identified by WDID No. 4 19C366900. • As specified in the General Permit, the permittee is required to develop a Storm Water Pollution Prevention Plan(SWPPP) in which the permittee must identify potential sources of pollution and describe specific best management practices (BMPs) that shall be implemented to eliminate or reduce storm water pollution from the facility. Your 2013-14 Annual Report received by the Los Angeles Regional Water Quality Control Board (Regional Board) on December 10, 2014 shows that the Numeric Action Level (NAL) was exceeded as listed in Table 1 below. Table 1 Date Sampled Constituent Numeric Action Level Storm Event (NAL). . . g Average 2/28/2014 Turbidity 250 273.5 (in NTU) General Permit sections.I.H.54, V.B.3 and V.B.4 require permittees with NAL exceedances to immediately implement additional BMPs and revise their SWPPP accordingly to either prevent or to substantially reduce the pollutants from construction-related storm water discharges to levels consistently within the NAL. iv;I•.;.t:;..I • 511,1m,, +, Ilnlr? 5AM13I 1.11Jii1'F1, E1(4CtITlIC MrICER 141 44e51 4rt'Rt.Sal In 2fta CA PIllt3 www.wntofhoMrl,.rrt.pnv?IanrntlrJr,T • • • Shahram Fozoonmehr -2- March 25, 2015 The permitee is required to comply immediately with the following tasks: 1. Immediately ensure full compliance with the General Permit. 2. By April 24, 2015, submit a NAL Exceedance Report that addresses the requirements specified in General Permit Section V.B., and identifies whether the source(s) of the pollutants causing the exceedance of the NAL are: 1) Related to the construction activities and whether additional BMPs are required to • meet Best Available Technology Economically Achievable (BAT)/Best Conventional Pollutant Control Technology(BCT)requirements; • reduce or prevent pollutants in storm water discharges from 'causing exceedances of receiving water objectives; and • determine what corrective action(s) were taken or will be taken and with a description of the schedule for completion. AND/OR 2) Related to the run-on associated with the construction site location and whether additional BMPs measures are required to: • meet BAT/BCT requirements; • reduce or prevent pollutants in storm water discharges from causing exceedances of receiving water objectives; and • what corrective action(s) were taken or will be taken with a description of the schedule for completion. Submit the NAL Exceedance Report as a pdf via e-mail or disk to: Harumi Goya Los Angeles Regional Water Quality Control Board Stormwater Compliance&Enforcement Unit 320 W. 4th St., Suite 200 Los Angeles, CA 90013 (213) 620-2283 Harumi.Goya@waterboards.ca.gov If you fail to submit the NAL Exceedance Report or implement or upgrade your BMPs and amend your SWPPP in compliance with the General Permit, you will be subject to enforcement, including the assessment of administrative civil liability (penalties) of up to $10,000 per day for each day of violation. Penalties accrue from the date the violation first occurred and will remain ongoing until the permittee complies with the requirements and provisions of the General Permit. • • Shahram Fozoonmehr -3- March 25,2015 • If you have any questions regarding this matter, please contact Ms. Harumi Goya at (213) 620- 2283 or via email at Harumi.Goya@waterboards.ca.gov or Mr. Ejigu Solomon at(213) 620-2237 or via email at Ejigu.Solomon@waterboards.ca.gov. Sincerely, ar..4O✓Jr, Gr?21�.. Paula Rasmussen Assistant Executive Officer cc: Kathleen McGowan, City of Rolling Hills (via email only) Yolanta Schwartz, City of Rolling Hills(via email only) t • • B. Bolton Engineering Corp. F� {{� � 25834 Narbonne Ave., Suite 210 ' Lomita, CA 90717 e 310-325-5580 Fax: 310-325-5581 SEP 2 i 2012 4 Polling 1-fills city BY Standard Urban Stormwater Mitigation Plan Project Information Fozoonmehr Residence 3 Appaloosa Lane Rolling Hills, CA 90274 Prepared for: Fozoonmehr Residence 3 Appaloosa Lane Rolling Hills, CA 90274 Prepared by: Bolton Engineering Corp. Civil Engineering & Land Surveying 25834 Narbonne Avenue, Suite 210 Lomita, CA 90717 Phone (310) 325-5580 SUSMP TABLE OF CONTENTS 1. Project Description Page 1 1.1. Site Conditions Page 1 1.2. Flow Patterns Page 1 2. Planning Priority Project Subject to SUSMP Page 2 3. Additional Treatment BMPs Page 3 4. Treatment BMPs Maintenance Page 3 5. Additional Drainage System Maintenance Page 3 Appendix Appendix A— Grading and Drainage Plan Appendix B - SUSUMP Plan Appendix C — Energy Dissipater Appendix D — Swale • Hydro ogy and Hydraulics Study Fozoonmehr Residence 3 Appaloosa Lane Rolling Hills, CA 90274 1. Project Description The project is a single family residence on hillside. 1.1 Site Conditions The site is currently vacant with vegetation only. The proposed site will have a new single family house with garage, concrete driveway, terraces, and vegetation. 1.2 Flow Patterns Based on topography, existing drainage follows the existing contours and sheet flows downhill. For the post-development condition, hill side runoff will be diverted to vegetated areas before entering terraces where concrete swales will convey the runoff in to an underground drainage system; the said underground drainage system will also carry the pad and roof runoff. Finally, the runoff will be conveyed, as shown on Appendix A, into an erosion control structure where the runoff will be slowed down and dispersed to sheet flow downhill. Furthermore, an underground drainage system is also proposed for the bridle trail. The runoff will enter another erosion control structure where the runoff will be slowed down and dispersed to sheet flow downhill. (See Appendix A for Grading, Drainage Plan, and Appendix B for SUSMP Plan) Page 11 • Hydrology and Hydraulics Study Fozoonmehr Residence 3 Appaloosa Lane Rolling Hills, CA 90274 2. Planning Priority Project Subject to SUSMP The proposed project is a single-family hillside development that contemplates grading on a natural slope that is 25% or greater and where grading contemplates cut or fills slopes. Therefore, according to Los Angeles County Department of Public Works, the construction is obliged to the following requirements. • Single-Family Hillside Development Requirements: 1. Protect slopes and channels Retaining walls are included in the additions as shown on the Grading, Drainage Plan (Appendix A). Retaining wall serves as a protection for the slope. 2. Conserve natural areas Natural areas will be conserved as shown with SUSMP Note 1 on the SUSMP Plan (Appendix B).. 3. Direct surface flow to vegetated areas before discharge unless the diversion would result in slope instability. Surface runoff will be directed to vegetated areas before being collected by a catch basin.This is shown SUSMP Note 2 on SUSMP Plan (Appendix B) 4. Provide storm drain system stenciling and signage Stenciling and signage will be provided at storm drains as shown with SUSMP Note 3 on the SUSMP Plan (Appendix B). 5. Divert roof runoff to vegetated areas before discharge unless the diversion would result in slope instability. Since diverting the runoff to vegetated areas will result in slope instability, roof top runoff will be collected by downspouts that connect to the proposed underground drainage system per city requirements. This is shown SUSMP Note 4 on SUSMP Plan (Appendix B) Page 12 • Hydro ogy and Hydraulics Study Fozoonmehr Residence 3 Appaloosa Lane Rolling Hills, CA 90274 3. Additional Treatment BMPs Energy Dissipater (Appendix C) All runoff from the underground drainage system will ultimately enter energy dissipaters before discharging onto existing natural area.This is shown SUSMP Note 5 and Note 6 on SUSMP Plan (Appendix B). See Appendix C for details. 4. Treatment BMPs Maintenance Energy Dissipater Energy dissipater shall be inspected and cleared of debris and blockage before a forecasted rain event. Debris and blockage shall be cleaned and removed in order for the energy dissipater to dissipate runoff effectively. 5. Additional Drainage System Maintenance Owners of the property are to maintain the drainage system devices per the following requirements. - Catch Basins and grates shall be inspected and cleared of debris and blockage before the rainy season, and/or before a forecasted rain event. - Concrete Swales shall be inspected and cleared of debris before the rainy season, and/or before a forecasted rain event. Page 13 • • Appendix A Grading and Drainage Plan PROPOSED sOE_COIENT.. wn•••P. 01,4•Nv.0 .evav +!r Ir.r I Fry P!rT�pns SURFACE 8,..x.C CCNSSTMG OF ON-SHE ALL ROOF f%IANALS To BE CAPTURED [.sn.a COMAS • ~_- Tr'-• /' PM LA"W1ODAL5NEAR NO DPW WO M ORAIUA SYSTEM S.M.Mt r t A' A r r-At ! 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Z-- j, � , - �, + --- _-- Ur -'_ AWALLDRAINS,DRNNAGElNLEfS _ �"fr.i ,\ , - ,-© � ' —`�—�� .. —_ _••7_ DEVICES EVERY MONTHS OR MORE _5 i !/' ' / ' •J /'' -� �/ -'" © l = •. _ ___ �ii -_ OFTEN/�$NECESSARY Ei . ' - �% 01E s� © — - 3 y% /� _ I OJT 5 �:. /. , • /i */ i �f 'ate .I 111E 1 T .� _ ` 1 g El • :' / ©--_ ----- ---- --- - yd.T` 0, . , , (1 I IIR pf j 1, . • •,� \ ` \\ t �_ r___.: : . ' • ,-'" :.-..i. � -f p Q .1 'It T I • tCC ":.:" - - - _ _ /7i '''''' .o.' . .n. ...-/f6: A , 1 01. / / .4 ,II . • /:-... .7 RA -, ,' i, , i• , , frif 0 • /.- -- - '• -- - - - • ' - .. -0, I - 31L51 ITT SPE Aib PZ. '', 7'-- © -♦ - -Y ATI SEEPAGE 7tF5 �� 00 Z - g lE ��t— w.weEe i • �, -.lAj4 litc� 7 I 1.1 Mg f i —mar '�`'"� 1.001,. „/----... . .... � v '., I i _ -- , - -- +:`\ - - `— - - - — \ •.. N.LA Al 1.t --�f t. 1 Asti ♦ • � r' � _- = j'``� a' + 1 =-- ��.r �� '- ` _ -� spy <� a �` --t- RMr r • Appendix C Energy Dissipater i 0 18" 18" 18'I 18" 2'-0" 24" x 18" MIN. ROCK OR 4"x6"x12" MOUND DIRT . I �rp, CONCRETE BLOCK BURIED 6" //i/ IN SLAB. ONE ROCK PER 18 OVER PIPE I,AW, SQ. IN. MAX. 14%,... rs�4 j/ 12" LIP MATCH EXISTING GRADE Q 48" CUTOFF DEEPEN SAS REQUIRED TO PROTECT SLOPES #5 @ 24" EA.WAY 4 8" ` 8' 12' 8',d MATCH EXISTING GRADE 25' LONG ENERGY DISSIPATER DETAIL 0 NO SCALE 8" 8" 8" 8" 2'-0" 12" x 8" MIN. ROCK OR 4"x6"x12" MOUND DIRT 41: �S• CONCRETE BLOCK BURIED 6" OVER PIPE •w/N IN SLAB. ONE ROCK PER 18 �, III•• SQ. IN. MAX. 41\ Q r0�tij/ 2" LIP MATCH EXISTING GRADE 1 24" CUTOFF DEEPEN IV A,1 / AS REQUIRED TO S PROTECTES #4 @ 24" EA.WAY 4 �6 1 " 061. 8' 6 � , 1' 6'H MATCH EXISTING GRADE 15' LONG ENERGY DISSIPATER DETAIL 411 NO SCALE I r • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY EXECUTIVE SUMMARY BIOLOGICAL RESOURCES ASSESSMENT FOR THE FOZOON(\IEHR PROPERTY DEVELOPMENT PROJECT IN THE CITY OF ROLLING HILLS,Los ANGELES COUNTY, CALIFORNIA Prepared for: Dr.S. Fozoonmehr 28701 Highridge Dr. Rolling Hills Estates, California 90274 Prepared by: Taya K. Cummins and Michael W. Tuma SWCA Environmental Consultants 625 Fair Oaks Boulevard, Suite 1 90 South Pasadena, California 91030 (626) 240-0587 July 7, 2008 SWCA Project Number: 14594 1 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY EXECUTIVE SU11•1MIARv Introduction SWCA Environmental Consultants was retained by Dr. S. Fozoonmehr to conduct a biological assessment in support of a grading permit for the proposed construction of a residential hone'esources(poje(project) located at 3 Appaloosa Lane in the City of Rolling Hills (City), Los Angeles The purpose of this assessment is to determine whether the proposed project has Cthetpotentialot to'affect sensitive biological resources, and to explore options for mitigating the goals and objectives of the City. The project is located on a parcel approx inatelyt8.9wlaccreslly in swit ize; project grading is proposed for 2.44 acres of the parcel. In addition, to achieve slope stabilization,grading is also proposed on adjacent properties, including 0.60 acre at 17 Buggy whip Drive and 0.09 acre at 19 Buggy whip Drive. Methods SWCA biologists Michael Tuma (wildlife biologist) and Taya Cummins (botanist) conducted the field visit on June 24, 2008. between 8:00 a.m. and 10:30 a.m., implementing standard biological investigation field methodologies. Current land use on the project's parcel consists of an avocado orchard and a public equestrian trail running along the northern and western boundaries. A blue-line drainage associated with Sepulveda Canyon forms the eastern and southern boundaries of the property. Vegetation within the project area and the adjacent parcels is highly disturbed and consists primarily of Poison Oak-Toyon Coastal Sage Scrub, Lemonadeberry Coastal Sage Scrub, Revegetated Coastal Sage Scrub, Nonnative Grassland, Orchard,and Transitional Bare Areas. Results Because all of the habitats as well as plants and wildlife species identified in the CNDDB and CNPS Rare Plant Inventory searches were determined to either be "absent"or"not likely to occur," no special-status plant species are expected to occur within the project area. In addition, no oak trees were identified within the project area. Project implementation would result in the removal of approximately 0.39 acre of lemonadeberry coastal scrub, 0.52 acre of nonnative grassland, and 2.2 acres of existing orchard g operations. These habitats arenot considered sensitive. However, n pactshat to'tnatilve'ttvegeati nn communities within the project area, including the poison oak—toyon coastal scrub and the lmonadeberry coastal scrub,contribute to the ongoing loss of habitat within the vicinity as a result of new development. Habitats associated with the Sepulveda Canyon blue-line drainage, specifically the poison oak—toyon habitat, could be considered jurisdictional by the USACE or CDFG. This feature is located outside of grading limits and direct impacts to this drainage are not expected to occur. However, winter rains and construction activities may result in soil erosion and the deposition of debris into this drainage if appropriate erosion control practices are not implemented. The project area likely provides nesting habitat for nesting avian species whose nests and young are protected under the MBTA and California Fish and Game Codes. Construction activities that occur from January 15 through September 15 could result in both direct and indirect impacts to nesting avian species. Any impacts (direct or indirect) that result in the abandonment or destruction of an active nest or the destruction of eggs or young of any protected avian species, including special-status species, would be considered a significant impact under CEQA. SWCA Environmental Consultants ly I • S BIOLOGICAL RESOURCES MT FOZOONMENRASSESS PROPERTY Recommendations To account the loss of approximately ().39 acre of native lemonadeberry coastal scrub habitat from the proposed project. SWCA recommends that the vegetation be replaced on-site at a 4:I ratio, for a total of 1.56 acres. Revegetation shall be completed on-site and confined to „adjacent to graded areas. A list of plant species suitable for reveg graded areas and lands ed in immediately report. T guide the revegetation process, a revegetatiom plan should be prepared by a,quali is 1fiedlprofessional To Direct impacts to the blue-line Sepulveda Canyon drainage feature, including soil erosion and the deposition of debris into this channel, may result if proper best management practices (BMPs) are not implemented. SWCA recommends that BMPs, such as the installation of drift fences or straw wattles surrounding the grading limits, be implemented prior to grading and remain in place until construction is complete. With the implementation of such BMPs, impacts to this drainage would not be considered significant and a Streambed Alteration Agreement would likely not be required. SWCA recommends that ground-disturbing and vegetation removal of the project be performed outside of the breeding season for b ds'tors betweenassoctd September witht16canon d January 14. If these project activities cannot be implemented during this time period, biological surveys and nest protection measures will he necessary. SWCA Environmental Consultants iv • • T Biological Resources Assessment for the Fozoonmehr Property Development Project in the City of Rolling Hills, Los Angeles County, California Prepared for Dr. S. Fozoonmehr Prepared by SWCA Environmental Consultants June 30, 2008 \_ • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT FOR THE FOZOONMEHR PROPERTY DEVELOPMENT PROJECT IN TILE CITY OF ROLLING HILLS, Los ANGELES COUNTY, CALIFORNIA Prepared for: Dr. S. Fozoonmehr 28701 Highridge Dr. Rolling Hills Estates, California 90274 Prepared by: Taya K. Cummins and Michael W. Tuma SWCA Environmental Consultants 625 Fair Oaks Boulevard, Suite 190 South Pasadena, California 91030 (626)240-0587 June 30, 2008 S\VCA Project Number: 14594 1 � • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY TABLE OF CONTENTS 1. INTRODUCTION 1.1 Purpose of Assessment I 1.2 Project Location and Description I 1.3 Regulatory Setting 1 1.3.1 Federal Regulations I 1.3.2 State Regulations 1 1.3.3 Local Regulations 2 1.4 Environmental Settino 3 2. METHODS 3 2.1 Literature and Database Search 4 2.2 Field Surveys 4 2.3 Assessment of Special-status Species Potential 5 3. RESULTS 5 3.1 Field Survey 6 3.2 Biotic Habitats 6 3.2.1 Biotic Habitats within the Project Area 6 3.3 Assessment of Sensitive Biological Resources 7 3.3.1 Sensitive Habitats 11 3.3.2 Special-status Species I 1 4. IMPACT ANALYSIS I 1 4.1 Biotic Habitats 14 4.2 Sensitive Habitats 14 4.3 Special-status Plants 14 4.4 Special-status Wildlife 14 • 4.4.1 Nesting Migratory and Native Avian Species 14 5. RECOMMENDATIONS 14 5.1 Biotic Habitats 15 5.2 Sensitive Habitats 15 5.3 Nesting Migratory and Native Avian Species 15 6. REFERENCES 16 17 LIST OF TABLES Table I. Biotic Habitats 6 LIST OF FIGURES Figure 1. Project Location Figure 2. Habitats within the Project Area 18 Figure 3. Special-status Species Occurrences in the Project Area Vicinity 19 SWCA Environmental Consultants �l � r ' • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY LIST OF PHOTOGRAPHS Photograph I. Overview of Fozoonmehr Property from across Sepulveda Canyon (lacing west)... 4 Photograph 2. Coastal scrub habitat (right) and orchard(lclt) within grading limits along northwestern boundary of the Fozoonmchr property. Photograph 3. Poison oak—toyon scrub in drainage along southern boundary and blue-gum 7 eucalyptus grove on adjacent parcel (facing cast) Photograph 4. Revegctated coastal sage scrub on slope adjacent to the Fozoonmelu'property (facing north down Sepulveda Canyon). Photograph 5. Nonnative grassland on adjacent parcels within grading 9 Photograph 6. Overgrown vegetation and fruit tress in the orchard habitat�uts. 09 Photograph 7.Transitional bare area across Appaloosa Lane(facingeast 1 from orchard) ! I I LIST OF APPENDICES APPENDIX A:Plant and Wildlife Lists APPENDIX B:Assessment of Special-status Species and Sensitive Habitats Within the Project Area Vicinity SWCA Environmental Consultants iv t Gl • • . 1 • ' BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 1. INTRODUCTION 1.1 PURPOSE OF ASSESSMENT SWCA Environmental Consultants was retained by Dr. S. Fozoonmchr to conduct a biological resources assessment in support of a grading permit for the proposed constriction of a residential home (project) in the City of Rolling Hills (City), Los Angeles County, California. The purpose of this assessment is to determine whether the proposed project has the potential to affect sensitive biological resources, and to • explore options for mitigating those resources that will comply with the goals and objectives of the City. This biological resources assessment did not include a fornial wetland delineation or focused surveys and is not intended to provide sufficient documentation for federal or state permits. 1.2 PROJECT LOCATION AND DESCRIPTION The project is located at 3 Appaloosa Lane in the City of Rolling Hills, Los Angeles County, California. The project area is located approximately 1 mile southwest of the entrance to the gated community of Rolling Hills at the intersection of Palos Verdes Drive North and Portuguese Bend Road/Rolling Hills Road, and 4 miles west of the 110 freeway. The project area, which is situated at an elevation of approximately 250 meters (820 feet) above mean sea level, is located in the San Bernardino Meridian, Township 5 South, Range 14 West, section 4 (33° 45' 51.06" N; 118° 21' 07.48" W) of the 1964 U.S. Geologic Survey(USGS)Torrance 7.5-minute topographic quadrangle,photorevised 1981 (Figure 1). The project is located on a parcel approximately 8.9 acres in size; project grading is proposed for 2.44 acres of the parcel. In addition, to achieve slope stabilization, grading is also proposed on adjacent properties, including 0.60 acre at 17 Buggy whip Drive and 0.09 acre at 19 Buggy whip Drive. Current land use on the project's parcel consists of an avocado orchard and a public equestrian trail running along the northern and western boundaries. A blue-line drainage associated with Sepulveda Canyon forms the eastern and southern boundaries of the property. 1.3 REGULATORY SETTING 1.3.1 Federal Regulations Section 404 of the Clean Water Act(33 Unites States Code USCJ 1344 et seq.) Section 404 of the Clean Water Act (33 USC 1344 et seq.)prohibits discharge of dredged or fill material into "waters of the United States" without a permit from the U.S. Army Corps of Engineers (USACE). The USACE and the U.S. Environmental Protection Agency administer this Act. In addition to traditional navigable waters, the definition of waters of the U.S. includes wetland areas in or adjacent to jurisdictional waters "that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support,and that under normal circumstances do support,a prevalence of vegetation typically adapted for life in saturated soil conditions"(33 Code of Federal Regulations [CFR] 328.3 7b). Projects with impacts to waters of the U.S. may require an individual permit. Small-scale projects with minimal impacts may be authorized by nationwide permits, which have an expedited process compared with the individual permit process. Mitigation of wetland impacts is required as a condition of the Section 404 permit and may include preservation, restoration, or enhancement within the study area and/or off- SWCA Environmental Consultants 1 • f • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY site restoration or enhancement. The characteristics of restored or enhanced wetlands must be equal to or better than those characteristics of affected wetlands to achieve no net loss of wetlands values. Federal Endangered Species Act (ESA; 16 USC 153 et seq.) Applicants for projects that could result in adverse impacts to any federally listed species are required to mitigate potential impacts in consultation with the U.S. Fish and Wildlife Service (USFWS). Adverse impacts, defined as "take," are prohibited except under authorization through Section 7 or Section 10 consultation,and Incidental Take Authorization. During consultations, determinations arc made regarding the proposed project and its potential to jeopardize the continued existence of federally listed species,and reasonable and prudent mitigation measures required to avoid such jeopardy. Mitigation is required for adverse impacts to any listed species or candidate species proposed for listing. Take, under federal definition, currently includes actions that could result in "significant habitat modification or degradation" (50 CFR Section 17.3). Candidate species arc not protected under ESA. However, the USF\VS advises project applicants that candidate species could be elevated to listed status at any time, and should be regarded as species with special consideration.. Migratory Bird Treaty Act(MBTA; 16 USC 703 to 711) The MBTA prevents the take of all migratory birds, including their nests and eggs. Bald and Golden Eagle Protection Act(16 USC 668) This act specifically protects bald and golden eagles from being killed or their eggs taken. 1.3.2 State Regulations California Endangered Species Act(CESA; Fish and Game Code Section 2050 et seq.) Species listed under the CESA cannot be taken or harmed, except under specific permit. As currently stated in the act,"take"means to hunt,pursue,catch,capture,or kill or to attempt to do so. Fish and Game Code Sections 3511,4700,5050, and 5515 These sections provide a provision for the protection of bird, mammal, reptile, amphibian, and fish species that are "fully protected."Fully protected animals may not be harmed, taken,or possessed. Fish and Game Code Section 3503 This section states that it is unlawful to take, possess, or needlessly destroy the nest or eggs of any bird, except as otherwise provided by this Code or any regulation made pursuant thereto. Fish and Game Code Section 3503.5 This section provides protection for all birds of prey, including their eggs and nests. SWCA Environmental Consultants 2 �J • . i t BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fish and Game Code Section 3513 This section makes it unlawful to take or possess any migratory non-game bird as designated in the M 13TA. Fish and Game Code Sections 1900 et seq., or Native Plant Protection Act This section lists threatened, endangered, and rare plants so designated by the California Fish and Game Commission. Title 14,California Code of Regulations,Sections 670.2 and 670.5 These sections list animals designated as threatened or endangered in California. The California Department of Fish and Game (CDFG) designates spccics considered to be indicators of regional habitat changes, or candidate species for future state listing, as California species of special concern. Species of special concern do not have special legal status, but arc used by the CDFG as a management tool when considering the future use of any land parcel. California Fish and Game Code(Sections 1601 through 1607) These sections prohibit alteration of any lake or streambed, including intermittent and seasonal channels and many artificial channels, Without execution ofa Streambed Alteration Agreement through the CDFG. This applies to any channel modifications that would be required to meet drainage, transportation or flood control objectives of the project. California Environmental Quality Act(CEQA) CEQA requires that a project's effects on environmental resources must be analyzed and assessed using criteria determined by the lead agency. CEQA defines a rare species in a broader sense than the definitions of threatened, endangered, or California species of concern. Under this definition, CDFG can request additional consideration of species not otherwise protected. 1.3.3 Local Regulations City of Rolling Hills The City of Rolling Hills Planning Department oversees all development permits. As part of this process, they ensure that projects arc developed in an environmentally responsible manner. The City's Planning Department seeks to respect native wildlife and natural surroundings by protecting natural resources through project-specific recommendations. 1.4 ENVIRONMENTAL SETTING The project area consists primarily of sloping hillside which drains to an ephemeral creek within Sepulveda Canyon. Vegetation within the project area and the adjacent parcels is highly disturbed and consists primarily of an avocado orchard with a nonnative herbaceous understory, coastal sage scrub vegetation along the outer edges of the property, and ephemeral drainages (Photograph 1). Soils underlying the project area consist of calcareous materials and clay soils. Land uses in the vicinity of the SWCA Environmental Consultants 3 ` ) • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY project area include large residential lots, equestrian facilities, ruderal fields, and orchards, pastures, and urban development. The Pacific Ocean is located 4 miles south of the project area. • 1q0177atimi-...;--'-'-•,,,t,,..t...---,. .. .;I-SIA t;4'TM;;24 f t a .i----`r }.i..Na 7:x r1.t v.1! w C }t •<iw"- =rh r+'s "r y q'�""'kT^ -i-: +, ,,�,,,,4�tt,;,+ q ?t 1•., f! � ", y:tt 41, ..-i 3+.x't i,r�r ; ` We''_p ', ♦';ai T r1�i.�wE 4��'j 4a4 ,'jA""",.. 5�`', itt'tt +k i Al +Y�Jif {/ Sp w rt r i {rl4►� F` uaL( r f. .r s! ,. ,1"-4✓fir 1 '.I :I§. •ot%x �� .aF A 1 1 Sri '4 r +'~]''ti. 3� ,2+tr rr+ " - : it , l ",. 1, ,, +r 0. t t ,t x : ,.i. 4 iln� a y��l 4i .,�t ,�c+ �, GS, a M�v x r { 'r 4?i ',P Jr 1, aggitf fl+� �i b t r. G r k„ 7f� ,t I G 1,d " 1 .� R j",4 �._ `k. w jar�`4''.e ri Y �ar11a fa., c > 1 € , Yt{ � �1 i t a+h{ t, N 6. Liiy.,C' i<i; . ! tr r i 417f rM b]�, , ,N?is prt '4eS3'R r +r it+"= 1 , !t N s;f i �� 3 fl'8 '' 1(r "a 1 L(Srl+t f ry 7a:, t,, !: Ji, ;tk k4 a •L',!`' :-!:i--g_5;,.4 e 4 +s4.1 f'? Photograph 1. Overview of Fozoonmehr Property from across Sepulveda Canyon (facing west). 2. METHODS 2.1 LITERATURE AND DATABASE SEARCII SWCA biologists reviewed existing sources of information regarding occurrences of special-status species and assessed the potential for occurrence of these species within the project area. Special-status species arc plants and animals in one or more of the following categories: • Species listed or proposed for listing as threatened or endangered under ESA(50 CFR 17.12 [listed plants], 50 CFR 17.11 [listed animals],and various notices in the Federal Register[FR] [proposed species]). • Species that arc candidates for possible future listing as threatened or endangered under ESA(67 FR 40657,June 13, 2002). • Species listed or proposed for listing by the State of California as threatened or endangered under the California Endangered Species Act(CESA)(14 California Code of Regulations 670.5). • Species that meet the definitions of rare or endangered under CEQA (State CEQA Guidelines Section 15380). • Plants listed as rare under the California Native Plant Protection Act(California Fish and Game Code Section 1900 et seq.). • Plants considered by the California Native Plant Society(CNPS)to be"rare,threatened, or endangered in California"(Lists I B and 2 in CNPS 2008). • Plants listed by CNPS as plants about which more information is needed to determine their status and plants of limited distribution(Lists 3 and 4 in CNPS 2008),which may be included as special-status species on the basis of local significance or recent biological information. • Animal species of special concern as listed by CDFG (2006). SWCA Environmental Consultants 4 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY • Animals fully protected in California(California Fish and Game Code Sections 3511 [birds] 4700[mammals], 5050[amphibians and reptiles],and 5515 [fish]). The following sources of information were consulted: • The California Natural Diversity Database(CNDDB)(CNDDB 2008) for the USGS Torrance 7.5-minute quadrangle and eight surrounding quadrangles in the project vicinity, including Venice, Inglewood,South Gate, Redondo Beach, Long Beach, Redondo Beach OE S, San Pedro, and Long Beach OE S;accessed June 23, 2008. • CNPS 2007 online Inventory of Rare and Endangered Plants of California for the USGS Torrance 7.5-minute quadrangle and eight surrounding quadrangles in the project vicinity, including Venice, Inglewood, South Gate, Redondo Beach, Long Beach, Redondo Beach OE S, San Pedro, and Long Beach OE S; accessed June 23, 2008. • U.S. Fish and Wildlife Service(USFWS 2008a), Ventura Fish & Wildlife Office Endangered and Threatened Species List(Los Angeles County);Accessed June 23, 2008. • USFWS Division of Habitat and Resource Conservation, National Wetlands Inventory(N\\'1) Wetlands Mapper(http://wetlandsfws.er.usgs.gov/NWI/index.html); Accessed June 23,2008 (USFWS 2008b) 2.2 FIELD SURVEYS SWCA biologists walked the project area and visually scanned lands within 150 meters (492 feet) of the project area boundary. Special attention was given to the proposed project grading limits plus a 50-foot buffer around this area to determine whether sensitive habitats or special-status species occur there. Photographs were taken to document biological resources and field conditions. Specific survey methods arc described in detail below. All plant species observed during the survey, including special-status species, were identified to species or further using taxonomic nomenclature provided in The Jepson Manual of Higher Plants of California (Hickman 1993). Vegetation communities observed during the survey were described in field notes, verified on aerial photographs, and described according to A Manual of California Vegetation (Salyer and Keeler-Wolf 1995) and Preliminary Descriptions of the Terrestrial Natural Communities of California (Holland 1986) whenever appropriate. Any potential wetland areas were also described and noted on aerials,but not fonually delineated. Wildlife species were recorded during the survey of the project arca and were detected by sight and sound. Wildlife habitats were also assessed within the project arca. Special attention was given to the potential for nesting bird species, including raptors, that could nest in trees within and adjacent to the project area. All species were identified to the lowest possible taxonomic level. No nocturnal or protocol surveys were conducted. 2.3 ASSESSMENT OF SPECIAL-STATUS SPECIES POTENTIAL Following the database searches and field survey, SWCA assessed the potential for occurrence for special-status species within the project area and its immediate vicinity. This consisted of assessing the biological conditions within the project arca and its immediate vicinity and the known occurrences of special-status species within the general vicinity of the project area (nine-quadrangle area). During the assessment, each species was assigned to one of the categories listed below. SWCA Environmental Consultants 5 • 0 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Present: Species is known to occur within the study arca, based on recent (within 20 years) CNDDB or other records,and/or was observed within the study area during the field survey(s). May occur: Species is known to occur in the vicinity of the study area (based on recent [within 20 years] CNDDB or other records within 5 miles [10 miles for butterfly, bird, and bat species] and/or based on professional expertise specific to the study area or species), and there is suitable habitat within the study area. Alternatively, there is suitable habitat within the study area and the study area limits arc within the known range of the species. For avian species, a distinction was made between occurrence potential on the study area as a forager, nester,and/or transient. Not likely to occur: Species is known to occur in the vicinity of the study area (within 5 miles for plants and terrestrial animals or 10 miles for butterfly, bird, and bat species); however, there is poor quality or marginal habitat in the study area. If the species occurs at the study area, it would likely be as a migrant, and the species is not likely to reproduce (breed or nest) within the study area due to a lack of suitable habitat or because the study area is outside of their known breeding range. Absent: There is no suitable habitat for the species within the study area, or the study area is located outside of the known range of the species. Alternatively, a species was surveyed for during the appropriate season with negative results for species occurrence. 3. RESULTS 3.1 FIELD SUIRVE\' SWCA biologists Michael Tuma (wildlife biologist) and Taya Cummins (botanist) conducted the field visit on June 24, 2008, between 8:00 a.m. and 10:30 a.m. Conditions encountered during the survey included average temperatures of 78 degrees Fahrenheit and a slight breeze. 3.2 BIOTIC HABITATS Habitats identified within the project area arc mapped in Figure 2 and described in detail below. Acreages of biotic habitats within the project area are provided in Table 1, including graded areas and total acreages. Full lists of plant and wildlife species observed within biotic habitats within the project area and on adjacent lands arc presented in Appendix A. Tabled. II3�iotic Habitats `y tI4i zit ,Ithj. ri 1'�I07.i:,4�Lip t r�,'T!`,! )7 .� I � t 42; 1Z4,R III 1 + l � a I ' yIP 1{,vf.�i1'� 9r,� 1\ Jt1D 1A.17t 1�`ILll. �1, tfi P I n 1/,� '1,��1F, fI ` ��J-+�- -1 ,11 .•.0 !, ' � 1 t ft 5 , it 13`Nyy�Y.r'IR�t1 I�1', F� ��yy�IAA�Ii ` � ��t..i"?9f� �1� Q • 1 1 �l 11 +y�yy�V,� 1; Poison Oak-Toyon 0.24 0 0 Coastal Sage Scrub 0 0 Lemonadeberry 2.04 0.22 0.05 Coastal Sage Scrub 0.12 0.39 Revegetated Coastal 0.18 0 0 Sage Scrub 0 0 Nonnative Grassland 0 0 0.04 0.48 0.52 SWCA Environmental Consultants 6 0 • t BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY (y 'Table I. Biotic Habitats r r \1S►'� trit• y 11 ;1 + tt3 xl� I I rI i� hn/. `{� y�+ 1 � r. 7 �y I. j4 S B!l S y: ,r , �1>TF t�Yu trl�.r.1IJj'ihr1r,7 5+ I J PrIla 'JN-ri �, 4-1 V, ( +a t. 1 , > ��`yI 1 + fi r r� f t t l") �, -:: t I Q 4ril I t k -R 11- 1R I1 It�?``l' 7) �fT �;�-, y i r r t r.. i to to r' iitilj _•.��''�''`` g�7l£ 15�t i (l rph 1 q ,14}.,�t,...fr �r i )t ; i r II 6 �'j1 r ) , 7 t r3 [P v ..,�� i?. -1 i Jet rl i5 �l C c r e.t - t 1 1T!I�J'R Y 3 dQ I I ,- ,% i r t re' 7 J f ��'�-�y 1 f l/� 1 ,{t +� 1 1 Is �s r it a tt1 �7 � :J�. � � �� 'ij 11��7 p� ! f--rtw•,�.�� r �� e ,� rtr f I r ' 1 IS5 S � �,� .1 t . w r7. � i j t `:r-. t.. :I s'.X ,i. �t:. r�.. I _ ..tu,'r Ii.li i : t; i,�l' .0 t i 71,.iry t 1 Z tr a ' i{ r ,it I ... Orchard ti 21 ilEnill TransF EINIIIII itional Bare Area 0.22 0 0 Total 8.89 0 0 0 0 0.09 0.60 3.13 3.2.1 Biotic Habitats within the Project Area Lcmonadcbcrry Coastal Scrub Lcmonadcbcrry coastal scrub habitat, a form of Venturan coastal sage scrub (Holland 1986; Element Code 32300), is dominated by na Icmodcbc u Ic sag ►ry (Rims integrfblia) with other common species, including P e (Salvia leuc•ophI•/kr), California sagebrush (Artemesia califc�rnic•a), and ashy-leaved buckwheat (Eriogonum cinerermm). This habitat was identified along the perimeter of the orchard, along the trail, along Appaloosa Lane, and within the grading limits on the adjacent parcels (Photograph 2). Because of land use and development, this habitat has been highly fragmented in the vicinity of the project. In total,the grading limits include 0.39 acre of Icmonadcbc coastal scrub, includin 27 of the Fozoonmchr property, 0.05 acre on the 19 Buggy whip Drive roe b 0��acre Buggy whip Drive property(Table I; Figure 2 . i P rtY, snd 0.12 acre on the 17 g ) This habitat is not considered sensitive. r4, Yar k''`kIA ti�r.J,Yw �'9'f'41;'�`.r Fri t't}'�Ml. •* �� 'S � �tij�v '''�5�4• 'i t �i�'��l�ljrfi �• t ti 1 ti t r tyil_ rr .tr egy,5, Ott � '" tr i lI � 1t4t�r'� �cr '«NY+ri t r_ r rr i,J)l tt t i i r f,,,k r d w t�i,t Ni a f,ttr,'/ Ft.r{4 , ,At t " �;Jr 7 Fri$1VV y r fit 1",• caq' al 11,i,“ 14-,r� �tl„'" it J rt rr T'G {'r `l+it i }lt irlRC} � \+ t �C' ! adr�1\ cf r S }1 2�Jlc, i ' 'tj,.�l1 �itr '�•/tt«J�r+� xs��\ t t r a RSr �i Ar 7 t 1 � N h RI �. tV "3•b }: rrt i1 rS,,s ! tqr s r r tS f n� * Y? Y t dS"� l r lla �, 1. 9 wr r ff€ fi ice+ ' °jI kd+�l Ham' n Y yI 1 1 11 != r (r a r !�. r S 11 t� '�•rrr t' r i l� ,t '{ ti ... ct ' Iv t�lf+ k Cti{Y ( 7 Vs i;'� JV"• ^ {�� p\ � ! !t l5� 4`r 7 ffT '1 I)l}� �,�'r,�Cc. yj;�;L Z(vi"'�ttr Gqi�,4r�t ti. L ir, �� ° � tia t '71dt 1. 1 ;Y''$ct4'ip�•,f tHIS nisi t, et+4 �' f' }4r. .0 t-t,ti,. 114 f , x rt •iki sr`j 4l'' x ..•'S �t {j r } 1 t 4 � t.ifit�iltr , rt•• er.i f+,pp`'r <V;4;4 N t �,,1 .+ M•,r h �r y^,J.I IZ� "Z'� k , trar ,4, L C t 1t ..`..K ...i :� .,+ \Y Nr.y I U fY-i� 7,.• :iT + a1 3i r t I v.. tr» sx J\:d 41`t•n er' x a�t•'+�,()15�t1r `r ' 1(J'J�� rF-- a f,�1' ,r f "F�kdrt+ 1 , 9,",t �,4M e� eppp/R�:' � �Ii� 4/1.4r.' rF..�'1C Y 7 Y)) i1y � 1 Y' . 44 Yi.0, f 7�,�r1 ,-:—..= J. . td� f yt 7!!L1t,-t/ ft1tt},V itt i;'1 yt� �"v��'Yla Sa �..4 ;.,1i�.�; jnf �' �*r�; Ef••j�°1�,i. fI fr �I)t 1 t g '1,, rtfTt"i�fii#� Photograph 2. Coastal scrub habitat(right)and orchard left) grading limits alongwithin northiwestern boundary of the Fozoonmchr property. Poison Oak—Toyon Coastal Scrub Poison oak—toyon coastal scrub habitat, a more mesic association within the Venturan coastal sage scrub (Holland 1986; Element Code 32300), is dominated by both poison oak and toyon, which combined SWCA Environmental Consultants 7 . 0 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY consisted of more that 75 percent of the vegetative cover. Other species observed within this habitat included arroyo willow (Sali.t• /uxin/cpis), blackberry (Rubes u simrs), and man-root (alumh mic•roc•apsule). This habitat was identified in the Sepulveda Canyon drainage along the eastern and southern boundary of the project area (Photograph 3). Much of the drainage on the property has been previously filled along Appaloosa Lane. Remaining p` drainage features indicate that the drainage is ephemeral, as it did not contain water during the time of the survey. However, during rainfall events, this drainage collects all runoff from the project area,carrying it off-site in a northerly direction. The drainage is identified as a blue-line stream in the USGS Torrance topographic quadrangle and may be considered potentially jurisdictional waters of the United States by CDFG or USACE. This habitat occurs over 0.24 acre of the Fozoonmehr property,but is located outside of the proposed grading limits(Table 1; Figure 2). This habitat is not considered sensitive. iJ .w 1 vt r pal P til ' ,.'�. aB ii4;q tC t 1'1� .-:g' .i �'ZS4 ✓' k s 1s :A.t �wb6 ,i a rtotie +TFY ti ri�» i'ya', fi ij l T: ; Otil. Ct a xK"-, �e ,41,1?.V; is z 4•§�p 74 ] 1,e:t` ;- "t4�l Ll�t y 0, --. I 7 1r J fT 1 '•� Y�'I(♦-��1.,' �'y}}''_'.'{� M'� I 41#k1? 't' ('+� �ri�j�•t �{'�a{°,7 �:.s'.�,►. +�, �a}•fig 1' /T v ss ;' t u1 �1 Jute��. t, t b , :f,t t, .4 : t'r &• -i_�V'S "y` 4,'ki �3.-�•.,. ,, ..4. 4,-1 -X... tali rl7'�,' t f, ,.,vi e u.- 4i -.t , i...`.a u �44?' 1 ,,Y�yy� ¢y./ g.' - ,�: tn )• 4 ,yyz� 1K eplif 1 it 1Y ,e •Y ..eF A, :':+. 5,i!. J �. ,,(ys4.1 '04Ri.,,L, ."▪tiw''t1.,!�•• }3:. t1P.t om :,7.4,11:... Ik ^ C.a4 1 6t/�' li t HMV S,t^� .J r +� ` 11 "r i; V!f?fie 4 ws r▪ S'J-�,.+� } '�1 ft }if 'c a' 14."P 4 h ,�; �. ,5�..�t ��r YJ^tom �j� jM��{.. 'Rt,#rNiiY(,,;� P+ ra // ets tjei.JVIt• I f"f 7, • :!S„.'r ' • r, ZT}' h+r ;i14,SY ? f .Y.'3'1.�.u. Photograph3. Poison oak—toyon scrub in drainage along southern boundary and blue-gum eucalyptus grove on adjacent parcel (facing cast). Revegctated Coastal Sage Scrub The slope located in the northeastern corner of the Fozoonmehr property has recently been revegetated with coastal sage scrub species. Species used in this planting include purple sage, California sagebrush, California encelia (Ence/ia californica), and coyotebrush (Bacc•haris pilularis). This revegetation effort was completed in association with grading that occurred on the Fozoonmehr property as a result of a residential development on the adjacent parcel (Photograph 4). This habitat occurs over 0.1 S acre of the Fozoonmehr property, but is located outside of the proposed grading limits (Table 1; Figure 2). This habitat is not considered sensitive. SWCA Environmental Consultants 8 ( ji) • • BIOLOGICAL RESOURCES h FOZOONMEHRASSESS PROPERTY ";:41 '',r4 #, A 1 rf' ♦ 11 „F i,tt, rr'C 4:�'y t + r •;.f..d.f►,_T.r. {Y+ �.•{ 1� • Sf*`'�"1 h�`.�,W'�`y 1<.y, ... i .'a ��3"'/... -11 --' .�r ..qq ,Ole".."!; ! f I-f)'1 r4,4i.t 14 'i,. 4,-7r,Ste}• ; ti'. y4','[1 p 5 ` = r J ;: t r:Lt I" t4 }� {1' Y N 0. L U t A 't '.1 ',L f/ Y"P�.� y4 Ji 4 w"�. Li 'a {4 Yl j,Y.4'i .1'(rat r Yt, '1,. ,,VL „ '",a v t.ht Yam, v'C. 4 �Iv��.+„�y� f::�-.7 Zn``S� -1fr,��' f{F'h� r tr•+4�,{w wy..M1,� H tt %,f,1 'I'Ava � ,r"'.4, .. a-is ,l',-4� 5 }i*T r s' .:j rv,,,sC.� ��y'4 „.. .A}• Sri.$T y,A;., b�.,v,r f :4 ��, .+:' r: •? j Iy�h� I ,Ij14P741 4,.' •"X A tf 1 1`I 1 I� •M f1 IY z.1a.• „� • �` '""6Z2,.' 'rj.� (, j1,j'aw• i"'s;.,et,',,,,;:, ' „a i" t•1 t + J: f CY?•h f ^ ♦ �t s4 Lek 1 �. �',�� ( 1�v'Y'►ev}'F ,t� 1Ff�i�'+ c,✓�'�. 9 fi�•i�y ,t.r� ra�d� ' !A cr.« 'c: Sa Ca ,i.x1a,4_=_.4,'N:4t J',., .Kt" tc.:,:. ►i.:-,a,•r ti`ti, ..., I Photograph 4. Revegctated coastal sage scrub on slope adjacent to the Fozoonmehr property (facing north down Sepulveda Canyon). Nonnative Grassland Nonnative grassland, classified as California annual grassland by Sawyer and Keeler-\Volt (1995), consists of nonnative herbaceous species. This habitat was identified on an abandoned orchard site within the grading limits and the surrounding 50-foot buffer of the adjacent parcels (Photograph 5). Plant species identified in this habitat included brome grasses (thymus spp.),filarce and included a few scattered mature peach (Prunus pe s ca)t trees.lThisrhabitat eoatas not identified on the Fozoonmehr property but was present within the grading limits on adjacent parcels, including 0.04 acre of the 19 Buggy whip Drive property and 0.60 acre of the 17 Buggy whip Drive property(Table I; Figure 2).This habitat is not considered sensitive. �I ili ��rl hLl��p+Y. 4 Y 2 S,�dd��iy r'��yV ti i{At11�". i'+��M,.,,.r �.1„j'„t'�*Tr '4 I� ! 1 '.,Ip N Nw s-:a l 11Kh I3µ ti�iF�,1i•'4r+N:1�r` , d� �i'tr�,i.trer'e'p` '1,,4''4,L3; ' , .tlr• c:,;1 t' P.4 y { ;v I� ti r,,f,' ZI h tti �* .�,... y Y T, J, 1� �.:f1,U i. t y{'Yf'7 114 f, f`*:.1,°+`3f' "( :k �f 1, ,Vr 'C• F'; � M I� �I� 1 t 4.+ , Itt "1� , F 'r. +i'M1 � L f �. t;t,i4�'1 i4 of f,";,„t: ,:' °�� >l `. + t,f-1p.,4 e i�t.11'0 - ��+'� C +.j�t41:t'lli 1.ak. �4.1%',�.11 rr f t'Q�1�,' .� 1.,' t ryf° -,i �'ti ,``t ,'I .`x_ryry( .i c� .r t a, ,r,p{tV hhr k�J YT �, ., r.�1n,. 1,4.'t� t "j,Is''4;Yl`'' e-fi▪t w1 ;-,1 ,�i-- ,111za''.t "',, .5 � ., t t}N`1}'r*f, -r''�`v.- :1:',�wy'�' 71 ,� h ,ti r� < _ ., till '" ✓'. r,,��! '1 t .b ra M "•L — • •• '...r �'L. f Zt r1 TS... h 7,. t*�.(1 x• fI�, t.i`,r.Y ry �,.r r r `��1''o ei 11 ta,/+',`al '4 t�l ,'., .ter +1 +`'N''E krA S k r ' 7`Z,' s•.rt0 yt 'r Fyn ? Y '';.;`, t'S - G Photograph 5. Nonnative grassland on adjacent parcels within grading limits. SWCA Environmental Consultants _ 9 i 0 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Orchard Most of the Fozoonmehr property consists of an avocado (Persea americana) orchard. The undcrstory consists of weedy species, including black mustard (Brasslca nigra) and slender wild oat (Arena barbata). Other species of fruit trees and volunteer native species common to the surrounding coastal scnrb habitats are scattered throughout the orchard (Photograph 6). This habitat consists of 6.21 acres of the Fozoonmehr property, including 2.22 acres within the grading limits (Table I; Figure 2). This habitat is not considered sensitive. 'a ,4 E� .e , q" F 3fi� hr any 2^' .F4! tip .. �- F) ( y�—,,.sad W.F �.{yam y� �1',.:P}iN •�„•J i r-4.,„¶r i s{'�i;v !' /%.o r' i4„1..t "y"t"�_,,;;• {w yti fi tt� 4, 3 F4 jt; .'i 5'J ii *,,, " Y� f ._�1A+i.ir.▪iN .,,„?.ail ,a. �,r i "�J'*;,T1 r`'er:7.s1 i tti, a�5.7{j'„,�'�p'.(„��e�tk.� „'"♦`vi.{,..�/ � ,c.1�r` 'fin i�., :s,Ta i Y !i` (- % �' ..t ryt�1t1 t } t. {; iwr a}} !,, rrr Lyeir)• G' r, s ` P'.7 77 tR ty. 4 04 C`4 Ll�el._X' 't/'t '�� a. .s,�.p rr 1. F 1 t'. '�i l . t ' L41,1. {}� T i�'l t '` r ,t,, at+.�?ti s.�i1.74.h l't " ''.7:" 'jot.' ;-S `#'tip * s44;ii:.-t4 it. j+K• • ' 1 4,-,. /" fr ..:?.1.14. ,•:•! . . , .,_.,5,' 'Aiwa Photograph 6.Overgrown vegetation and fruit tress in the orchard habitat. Transitional Bare Area Transitional bare areas arc defined as areas which are in transition from one land use activity to another (Anderson et al. 1976). Transitional bare areas were identified along the cast side of Appaloosa Lane, but still within the Fozoonmehr property(Photograph 7).This habitat was void of vegetation aside from a few opportunistic species such as redstem filarce and black mustard. This habitat consists of 0.22 acre of the Fozoonmehr property, and no grading is expected to occur within this habitat (Table 1; Figure 2). This habitat is not considered sensitive. SWCA Environmental Consultants 10 • • + , BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY ttt' S,i�t. ' d�tM t ,�, .l t I D • F�4 JC Y'4'^UI.>'4t-, `;:,r FDs 7•C• - ,i,y r a. <F �f1/ + < 177? V ,,rif trig cYr ✓ r ut •• l� .1"5.4 l ��,� �� I/ t71w"�4 wt ti� �Z L � r�+i1'rl1� �tot f'f t . ,,,ifii 3 7 �n}J`�"5'.1- >•, ,.9, 7 . ib 1` '1ti4 1~ 7 t .' �` V4t ?r ( t�J{.!n •r �r itiQ.b 1, a 1i: *'Rar 4r"'y • }.•yJ{t1,t tFky..r't($1 h��.(dy�q� A `fe Y WM �f }+Si ,,li'SkdtY - �I� rrnl't J ii�` t , 4 ...p ,Z-•R y >rw.. ttr �a,J�v f4�7`>•• '`j L ��7!•;k` '��nY #Ili}( it" .r � r3 �L7r / 6�17 �ti*9( lip'1tti+a��a 1F'+�T'••_.;L 1 � rl t AI.i� y�_...`1 r� ,�, ty .{ y, k XN�,1a" ] C(},7r)), , ' t 3 yF cL 1 ', :3', tff .7Tti li t it 1:114 4,-..W'i . �Jq -.i 1•''' tf ' „ . X r 4 • .-- .s h \ 'r tr 1.�-}p ,fn ti rrKVF°t ,•4 • i4 a`Y> C 7 .. a t i''F AC 7r ,. tk rr V�"F,tn YS�it. i 4 • t,if i. ul t• t>'�`�+• Photograph 7.Transitional bare area across Appaloosa Lane(facing east from orchard). 3.3 ASSESSIIENT OF SENSITIVE BIOLOGICAL RESOURCES A list of special-status species known to occur within the vicinity of the study area was geneated from the CNDDB and the CNPS 2007 online Inventory of Rare and Endangered Plants of California.r A total of 60 special-status species, including 25 plants and 35 wildlife species, as well as three sensitive habitats were identified within the nine-quadrangle area in the vicinity of the project area (Appendix B; Figure Provided below arc expanded descriptions for those species or habitats that were either present within the project area, or their occurrence potential was evaluated as"may occur"within the project arca. 3.3.1 Sensitive Habitats During the field survey, the potential for sensitive and potentially jurisdictional habitats was assessed within the project arca. A search of the CNDDB records for sensitive habitats was also conducted,which identified three sensitive habitats within the nine-quadrangle area, including southern coastal bluff scrub, southern coastal salt marsh, and southern dune scrub. None of these habitats were identified within the project arca during the survey. However, habitats associated with the Sepulveda Canyon drainage may be considered jurisdictional by CDFG or USACE. 3.3.2 Special-status Species Special-status Plants During the field survey, habitats capable of supporting special-status plant species were evaluated within the project area. Based on the analysis provided in Appendix B, the following species were eliminated from further consideration because (I) there is no suitable habitat within the project area and there arc no local records (within 5 miles) in the vicinity of the project area and/or (2) the project area is outside of their known ranee. Alternatively, although there arc records of these species within the project's vicinity (within 5 miles), there is no suitable habitat within the project area to support the occurrence of these species. These species were assessed as"absent": SWCA Environmental Consultants 11 ('�; • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY • Ventura marsh milk-vetch (Aslragahrs pl'C'nos/ac/n•as var./anosissimus) • Coastal dunes milk-vetch(Astruga/rrs lever var.liti) • Orcutt's pincushion (Chaenactisglabriusc'rdcr var.orcvrlliana) • Salt marsh bird's-beak (Cordrlanthus mari/inrtrs ssp. maritinurs) • Beach spectaclepod (Dithrrea maritinta) • Coulter's goldfields (Lav!lreniaglabrala ssp. council) • Spreading navarrctia(Narmrretiafos'salis) • California orcutt grass(Orcullia cc:111617lca) • Ballona cinquefoil (Potentil/a nrultijuga) • Lewis'evening-primrose(Camis:so,ticr/ewisii) • Lyon's pentachacta (Pentachaelu lrnnii) • Island green dudlcya (Dudleya virens ssp. ins/do/is) • Catalina crossosoma (Crossosoma ca/finnicum) • Southern tarplant(Cenlromadia(=Henrconiaj parn•i ssp.arrstralis) • Venial barley(Hordeuur intercedeus) • San Bernardino aster(Srnrpht'otric•hrrnt defoliation) • Estuary seablite (Suaeda es/erocr) • Coast woolly-heads(Nemac•atrlis denudala var.denudata) • Brand's star phacelia (Phace/ia stellaris) • San Fernando Valley spincflower(Chori_anthe pan3'i var.fernandina) Based on the analysis provided in Appendix B, the following species were eliminated from further consideration either because (1) there arc no recent local records of their occurrence in the vicinity of the project area, as determined through the CNDDB; or (2) although there arc recent local records of their occurrence within the vicinity of the project area, habitat within the project arca was determined to be to be marginal, limited, or otherwise unfavorable; or(3)the site does not likely provide suitable habitat fora sustaining population of this species. These species were assessed as"not likely to occur": • Aphanisma(Aphanisma bliloides) • South coast saltscalc(Atriplev pacifica) • Parish's brittlescale (A/ripler parishii) • Davidson's saltscale(Alriplex serenana var.dark/sonii) • Santa Catalina Island desert thorn (Lvcitmr brevipes var.hassei) Because all of the plants identified in the CNDDB and CNPS Rare Plant Inventory searches were determined to either be "absent" or "not likely to occur," no special-status plant species arc expected to occur within the project arca. In addition, no oak trees were identified within the project arca. Special-status Wildlife During the field survey, habitats capable of supporting special-status wildlife species were evaluated within the project area. Based on the analysis provided in Appendix B, the following species were eliminated from further consideration because (I) there is no suitable habitat within the project area AND there are no local records (within 5 miles or 10 miles for butterfly, bird, and bat species) in the vicinity of the project arca, and/or(2) the project area is outside of their known range. Alternatively, although there SWCA Environmental Consultants 12 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY are records of these species within the project's vicinity(within 5 miles or 10 miles for butterfly, bird,and bat species), there is no suitable habitat within the project area to support the occurrence of these species. These species were assessed as"absent:" • Belkin's dune tabanid fly(Brennania belkini) • Sandy beach tiger beetle(Cicinc/ela llirticolis gravida) • Western beach tiger beetle(Cicinc/ela latesignata lotesignata) • Frost's tiger beetle(Cici ic/ela sensllls fi•o.cti) • Globose dune beetle(Coe/Its globoses) • Henne's eucosman moth(Errcosma hennei) • El Segundo blue butterfly(Euphilotes battoides allrni) • Palos Verdes blue butterfly(Glcutcopsyche lygdannts palosrerc/esen is) • Lange's El Segundo Dune Weevil (Onychobaris langei) • Wandering (=saltmarsh)skipper (Panoguina errans) • El Segundo flower-loving fly(Rhaphionridas terminates terminates) • Dorothy's El Segundo dune weevil (Tnigonoscltta dorothea dorothea) • Mimic tryonia (California brackishwater snail)(Tri'onia imitator) • Mohave tui chub(Gila bicolor molravensis) • Southwestern pond turtle(Actinemps nlarmorata pallida) • Coast horned lizard(Phri,,osoma coronatlnn) • Tricolored blackbird(Agelaires tricolor) • Burrowing owl (.4thene cunicularicl) • Western snowy plover(Charadrius alerandrinus nirosus) • Southwestern willow flycatcher (Empidonax traillii eetimres) • California black rail (Latera/hts jamaicensis coRu•nie:this) • Belding's savannah sparrow(Passerculus sandwichensis beldingi) • California brown pelican (Pelecanus occidentalis c•a/ifornic•uc) • Coastal California gnatcatchcr(Po/iopti/a ca/ifornica californiccr) • California least tern (Sternll/a antil/arum brawni) • South coast marsh vole(tiiicrnius c•alifornic•Its stcphensi) • Pocketed free-tailed bat (1Vvc•tinonrops femorosacc•us) • Big free-tailed bat(Nrc•tinomops macrons) • Pacific pocket mouse(Perognathus longimembris perc•ifrcus) • Southern California saltmarsh shrew(Sorer ornatus salicornic•us) • American badger(Taxidea torus) Based on the analysis provided in Appendix B, the following species were eliminated from further consideration either because (I) there arc no recent local records of their occurrence in the vicinity of the project area, as determined through the CNDDB; or (2) although there are recent local records of their occurrence within the vicinity of the project area, habitat within the project area was determined to be to be marginal, limited, or otherwise unfavorable; or(3)the site does not likely provide suitable habitat for a sustaining population of this species. In addition, avian species may have been eliminated from further consideration because (1) they would use the project area only as a migrant or (2) they arc not likely to SWCA Environmental Consultants 13 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY reside or reproduce there due to a lack of appropriate habitat or because the project area is outside of their known breeding range. These species were assessed as"not likely to occur": • Monarch butterfly(Danau.c ple.rippns) • California mastiff bat(Eranops perolis cu/ifc�rnicrrs) • Silver-haired bat(Lasiont•c•leris nociiragans) • San Diego desert woodrat(Neotonra lepicla interntec/ia) Based on the analysis provided in Appendix B, no special-status wildlife species are expected to occur within the project arca. 4. IMPACT ANALYSIS 4.1 BIOTIC HABITATS Project implementation would result in the removal of approximately 0.39 acre of lemonadeberry coastal scrub, 0.52 acre of nonnative grassland, and 2.2 acres of existing orchard habitat during grading operations. These habitats are not considered sensitive. However, impacts to native vegetation communities within the project area, including the poison oak—toyon coastal scrub and the lemonadeberry coastal scrub,contribute to the ongoing loss of habitat within the vicinity as a result of new development. 4.2 SENSITIVE HABITATS No sensitive habitats listed by CNDDB were identified within the project arca. In addition, habitats associated with the Sepulveda Canyon blue-line drainage,specifically the poison oak—toyon habitat,could be considered jurisdictional by the USACE of CDFG. The actual drainage feature has been filled along most of the reach located on the Fozoonmehr property. It is located outside of grading limits but impacts to this drainage,including deposition of debris as a result of surface runoff, may occur. 4.3 SPECIAL-STATUS PLANTS No special-status plant species listed by CNPS or CNDDB were determined to occur within the project area. Therefore, no impacts to special-status plant species are expected as the result of implementation of the proposed project. 4.4 SPECIAL-STATUS WILDLIFE No special-status wildlife species listed by CNDDB were determined to occur within the project area. Therefore, no impacts to special-status wildlife species are expected as the result of implementation of the proposed project. 4.4.1 Nesting!Migratory and Native Avian Species The project arca likely provides nesting habitat for nesting avian species whose nests and young arc protected under the MBTA and California Fish and Game Codes. Construction activities associated with the proposed project that result in ground disturbance and/or the removal of vegetation could have both direct and indirect impacts to these sensitive resources. SWCA Environmental Consultants C � `� 14 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY The breeding season for birds generally occurs from January 15 through September 15; implementation of the project during this period could result in both direct and indirect impacts to nesting avian species. Direct project impacts would include the destruction of active nests, eggs, yno r vegetation removed within the proposed project. Indirect impacts would include noisegandced dtisturbanlce associated with the construction activities that cause birds in adjacent habitats to abandon their nests.Any impacts (direct or indirect) that result in the abandonment or destruction of an active nest or the destruction of eggs or young of any protected avian species, including special-status species, would be considered a significant impact under CEQA. 5. RECOMMENDATIONS 5.1 BIOTIC HABITATS To account the loss of approximately 0.39 acre of native lemonadeberry coastal scrub habitat from the proposed project, SWCA recommends that the vegetation be replaced on-site at a 4:1 ratio, for a total of 1.56 acres. Revegetation shall be completed on-site and confined to graded areas and lands immediately adjacent to graded areas. To guide this process, a revegetation plan should be prepared by a qualified professional. The plan should include the following details: • Project Description—Project description,purpose and goals of revegetation,and environmental setting. • Revegetation Design—Planting plan and irrigation plan layouts,native vegetation palette. Irrigation system should be temporary(three years). • Plant Materials—Revegctation materials should consist of site-specific species identified in the botanical inventory as appropriate for revegetation efforts. Plant materials should be derived from local native sources. A mixture of hydroseeding and container planting is recommended. • Implementation instructions—Detailed guide to planting, irrigation schedule,and erosion control methods and procedures. Installation and maintenance should be conducted by a qualified landscape contractor or other qualified professional. • Maintenance—Long-terns(three-year) maintenance plan, including weed control,mortality replacement,and irrigation issues. • Monitoring—A biological monitor shall visit the site on a bi-annual basis to ensure that revegetation efforts are meeting success criteria and to make maintenance recommendations. • Success Criteria—Success criteria shall be established for annual assessment for such items as native plant cover, weed cover,species diversity and recruitment, survivorship,and plant density. Identify remedial actions if identifiable problems arise or success goals are not met. • Reporting—At the end of the project,a summary report of revegetation efforts shall be submitted to the City. 5.2 SENSITIVE HABITATS The poison oak—toyon habitat associated with the blue-line Sepulveda Canyon drainage feature could be considered jurisdictional. To avoid impacts to this habitat,erosion control measures, including or straw wattles,should be put in place around the habitat to minimize surface runoff and deposition of debris. SWCA Environmental Consultants 15 • I BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 5.3 NESTING MIGRATORY AN!) NATIVE AVIAN SPECIES S\VCA recommends that ground-disturbing and vegetation removal activities associated with construction of the project be performed outside of the breeding season for birds, or between September 16 and January 14. If these project activities cannot be implemented during this time period, the project applicant should retain a qualified biologist to perform pre-construction nest surveys to identify active nests within and adjacent to(up to 500 feet) the project area. Any active non-raptor nests identified within the project area or within 300 feet of the project arca should be marked with a 300-foot buffer, and the buffer area would need to be avoided by construction activities until a qualified biologist determines that the chicks have fledged. Active raptor nests within the project arca or within 500 feet of the project arca should be marked with a 500-foot buffer and the buffer avoided until a qualified biologist determines that the chicks have fledged. If the 300-foot buffer for non-raptor nests or 500-foot buffer for raptor nests cannot be avoided during construction of the project, the project applicant should retain a qualified biologist to monitor the nests on a daily basis during construction to ensure that the nests do not fail as the result of noise generated by the construction. The biological monitor should have the authority to halt construction if the construction activities cause negative effects, such as the adults abandoning the nest or chicks falling from the nest. • SWCA Environmental Consultants ( �— 16 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 6. REFERENCES California Department of Fish and Game(CDFG). 2006. Special Animals. State of California, The Resources Agency, Department of Fish and Game, Natural Heritage Division, Natural Diversity Data Base, February 2006 update. California Native Plant Society(CNPS).2008. Inventory of Rare and Endangered Plants (online edition, v7-07d).California Native Plant Society. Sacramento,California, USA. <http://www.cnps.org/inventory>Accessed June 23,2008. California Natural Diversity Database (CNDDB). 2008. RAREFIND,Natural Heritage Division. California Department of Fish and Game,State of California. <http://www.dfg.ca.gov/biogeodata/cnddb/>Accessed June 23,2008. Hickman,J. C.,editor. 1993.The Jepson Manual. University of California Press, Berkeley, California, USA. Holland, R. F. 1986. Preliminary Descriptions of the Terrestrial natural Communities of California.State of California, The Resources Agency, Nongame Heritage Program, Department of Fish and Game, Sacramento,California, USA. Sawyer,.1. O.,and T. Keeler-Wolf. 1995. A Manual of California Vegetation. California Native Plant Society.Sacramento,California, USA. U. S. Fish and Wildlife Service(USFWS).2008a. Ventura Fish& Wildlife Office Endangered and Threatened Species List(Los Angeles County). U. S. Fish and Wildlife Service,Carlsbad, California, USA. <http://wvww.flvs.aov/vcntura/CFWO_Specics_List.htm> Accessed June 23, 2008. U.S. Fish and Wildlife Service(USF\VS). 2008b. National Wetlands Inventory Online Mapper. <http://www.fws.gov/nwi/>Accessed June 23,2008. SWCA Environmental Consultants ,7 17 • • • , • \ /:.••• leJ c • --e• 7 :RANCHvICW l;0 ‘..°\?..>-‘,. 0-'15' • ...:. 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I"tt f tt,t ..Illt:',..,. .,- ,-. l' l=r2===1 N Legend 0 25 50 Meters Vegetation Map oramitato Emma it f::1 Project Area 4...T5041BL/ter 0 100 200 Feet CD Parcel Boundaries * Shed Sfructure USGS Grad Fozoonmehr Property 7 5'Ooen,ang)e- EZ-.1. ing Limits Torrance.CA 1864 1Pnoto•oveed 1881) 0.--EquestnanTrail land Grant-Loa Pa Oa Vwees 1::::2 Aopaloosa Lare 1:2,400 Nom Soorce•TeeoSarrof Toenal•hp OSS Range 1.1W Umsectone0 .k.n4 Darr Make 7034 Figure 2. Habitats within the Project Area SWCA Environmental Consultants 19 . . e • .7„....7...z.,...t.......74,,,..,...,..„.,7:77-,..,...„,.•:.7.7.4.......'.:7,:,'. '•••-.-"'I,.• '...2,•--• -'"." • 'or ...t. • . , ;,,,,,.•.2•17....)..%•!>7.,;,, t '_ ; . •,-,.,.. ..-",i•-7-..;•'...c.i..--,10: .,. ,.: ...,..,,,,.,4;i.,...„.;.: . ,-;,..--:)....".-.r.' P p%..."1"7',--... 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I % • ,:.••• '.).•••:: .....'•-.1 .• . . • I • -c:.'...-1-':•'. .1.• - - 's : , • .A.;,....L.,c,:....- . ‘-,--....,... .....g .. , .......... . , , . , e••.; -.-,-... .,. : ‘i —.....:".. : .,.. • , 1- : ..,..„... .... ,-' - • .., ,...,„ ,,,.....,..... i . ---• •..., ,• ... ; .s. .,• ...., •. • . . ,,.- .. ,•• •., ,,•-• ......_, ..•-•- ...... I. Upend 0 2.000 4.000 Meters ....-1 ..,'"'" :1 Special•Statos Itt=ztot 1=IPtn,e1Ama ..D.V V*,.../..1.. ..,...,..,„.,..,,,,,., species Occurrences t 25 2 5 Mies Jj IC...:! ED Sp.,*Status Spec's&Ocrte,ncet Apatoosa Lane Project la,./..1 las rows Vogt.% 1158.400 iEt:::-)F.. ..1:7";‘tr: '^.IIIIIEITIIIII 110 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY APPENDIX A: Plant and Wildlife Lists SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fozoonmchr Property—Partial List of Plants,June 24,2008 tl_ ' '0� a e r r -e e eta ,; -- ., , Gymnosperms icc : firoOt ' 4�t �� > A.tJ;;w . ' Pinus sp. Pine tree Pinaceae Angiosperm—Dinocotyledons X Malosma laurina Laurel sumac Anacardiaceae • Rhus integrifolia X 9 Lemonade-berry Anacardiaceae X X ill • Schinus molle Peruvian pepper Anacardiaceae X Schinus• X X terebinthifolius Brazillian pepper Anacardiaceae Toxicodendron X X diversilobum Poison oak Anacardiaceae X • Bidens ilosa X p Beggar's tick Asteraceae X Daucus pusil/us Wild carrot X X X Apiaceae X X• 0 • Foeniculum vulgare Fennel Apiaceae X X Ner/um oleander Oleander Apocynaceae X Asclepias Narrow-leaf X • fascicularis milkweed Asclepidaceae Artemesia California X • califonica sagebrush Asteraceae Baccharis pilularis Coyotebrush Asteraceae X X X X X • Encelia califomica California encelia Asteraceae X X X Two-tone • Gnapha/ium bicolor everlasting Asteraceae Helianthus annuus Common sunflower Asteraceae X X X X X X X • lsocoma menziesii Coast goldenbush Asteraceae • X Lactuca seriola Prickly lettuce Asteraceae • Ma/acothrix saxitilis Cliff aster X X X X ` Asteraceae X Piciris echioides Bristly ox-tongue Asteraceae ' Si/ibum marianum Milk thistle X X X Asteraceae Brassica nigra Black mustard Brassicaceae X • Raphanus sativus Wild radish BrassicaceaeX XX X X X SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY rozoonmcltr Property—Partial List of Plants,June 24,2008 :` �-- ::. t 'I-:- . c=T=: 'llt•1=1 1 111 , .`"f `""`k''�'�v • - 1fa� '- �� . ( _` 1 , - Lonicera ..• • subspicata Honeysuckle Caprifoliaceae Sambucus X • mexicana Mexican elderberry Caprifoliaceae Chenopodium X X • album Lamb's quarters Chenopodiaceae Convovulus X X X • arvensis Field bindweed Convovulaceae Mara/,macrocapus Man-root Cucurbitaceae X X X X Lotus scoparius Deer weed Fabaceae X • Melilotus indicus Yellow sweetclover Fabaceae X X X X X • Vicia villosa Common vetch Fabaceae X Erodium cicutarium Redstem fillaree Geraniaceae X ,�� Geranium molle Dove's foot Geraniaceae X X X �- • Salvia leucophylla Purple sage Lamiaceae X X Persea americana Avocado(cultivars) Lauraceae X X • Malva parvifolia Cheeseweed Malvaceae X * I X X Olea europa European olive Oleaceae Eriogonum Ashy-leaved X • cinereum buckwheat Polygonaceae Eriogonum X g California • fasciculatum buckwheat Polygonaceae X X HeteromelesIII • arbutifolia Toyon Rosaceae X X Prunus armeniaca Apricot Rosaceae Prunus persica Peach Rosaceae X Rubus ursinus Blackberry Rosaceae X X X Galium aparine Goose grass Rubiaceae • Citrus x Limon X Lemon Rutaceae Salix lasiolepis Arroyo willow Salicaceae X X • Tropaeolum majus Nasturtium Tropaeolaceae X SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fozoonmelir Property—Partial List of Plants,June 24,2008 • Vv74444o aSri ut '� �i a V jo�' . +' _ _ tk1gLtigAngiosperm—Monocotyledons Yucca • Yucca sp. (ornamental) Liliaceae • Avena barbata Slender wild oat Poaceae X • Bromus diandrus Ripgut brome Poaceae X X X X Bromus X X XX X madritensis ssp. • * rubens Red brome Poaceae • Hordeum vulgare Barley Poaceae X X X X X Leymus X X X X X • condensates Giant wild rye Poaceae • Melica irnperfecta Coast melic X X X X Poaceae X X • Nassella pulchra Purple needlegrass Poaceae X --C'�` CSS=Coastal sage scrub;• =Nonnative species;•=Suitable for revegetation X X X Jj • SWCA Environmental Consultants • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Wildlife Species Observed on and adjacent to the Project Area e.' t ;} 4t4t1 ^ LIV ,I.F i ,Reptiles 4. Western fence lizard Sceloperus occidentalis San Diego Alligator Lizard Elgaria multicarinata webbii Birds 1111111111111.11111.1111111 Red-tailed hawk Buteo jamaicensis Falco sparverius Mourning dove Zenaida macroura Anna's hummingbird Calypte anna Western scrub-jay Aphelocoma calilornica American crow Corvus brachyrhynchos Psaltriparus minimus Thryomanes bewickii Northern mockingbird Mimus polyglottos California towhee Pipilo crissalis Spotted towhee Pipilo maculatus White-crowned sparrow Zonolrichia leucophrys House finch Carpodacus mexicanus Lesser goldfinch Carduelis psaltria SWCA Environmental Consultants CLI3 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY APPENDIX B: Assessment of Special-status Species and Sensitive Habitats Within the Project Area Vicinity SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT Special-status Plants and Sensitive Habitats Ra�7.11 : +rtlr Aphanisma blitoides Aphanisma None Nonejg 18.2 March— Coastal bluff scrub,coastal On bluffs and slopes near Not likely to occur:Though June dunes,coastal scrub. the ocean in sandy or clay there are 2 recent CNDDB soils. In steep decline on the records within 5 miles,there islands and the mainland. 1— is no suitable habitat within Astragalus Ventura Marsh milk- FE305 m elevation. the project area. pycnostachyus var. vetch SE 18.1 June—Oct Coastal salt marshes. Within reach of high tide or Absent:There is no suitable lanosissimus Historically in coastal protected by barrierIII thin the proj southern California;Now beaches,more rarely near area tandat lthere are noect known at one site in Ventura seeps on sandy bluffs. 1-35 records within 5 miles. Astragalus toner var. Coastal Dunes milk- FE County. m elevation. A ah SE 16.1 March— Coastal bluff scrub,coastal Moist,sandy depressions of Absent:There is no suitable May dunes. Known only from a bluffs or dunes along and habitat within the project few extant occurrences; near the Pacific Ocean;one area and there are no mostly historical in southern site on a clay terrace. 1-50 records within 5 miles. Atriplex paciCca South Coast California. m elevation. None None 1B 1-3(3-\' .2 Mar—Oct Coastal scrub,coastal bluff Alkali soils.1-500 m saltscale scrub,playas,chenopod elevation. Not likely to occur:Thereis marginally suitable habitat within the project area and 1 recent(1992)CNDDB record.However,this species was not identified Alriplex parishii Parish's brittlescale None None during the survey. 1 B.1 June—Oct Alkali meadows,vernal Usually on drying alkali flats Not likely to Occur: pools,chenopod scrub, with fine soils.4-140 m Though there is suitable playas. Plant collected only elevation. habitat within the project once since 1974(in 1993). area,there is only one historic record(date Atriplex serenana Davidson's saltscale None None unknown)within 5 miles. var. /er se endavidsoni 1B.2 April—Oct Coastal bluff scrub,coastal Alkaline soils.3-250 m Not likely to Occur: 4111 scrub. elevation. Though there is suitable habitat within the project area,there is only one historic record(date None None 3 unknown)within 5 miles. March— Very sandy substrates near June the beach,typically on GNPS Absent:records in there are beach bluffs. CNPS in the Inglewood,San Pedro,and Lewis'evening- Venice Quads,there is no amissonia lewisii primrose suitable habitat within the C project area. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT - Fq Ir 'e � .-( t Centromadia Southern tarplant FSC � - � � � � T None 1B.1 Ma Nov Marshes and swamps ssp.auzontaJ parryi y- P Often in disturbed sites near Absent:Though there are ssp.australis (margins),valley and foothill the coast.Also in alkaline two recent record(1997, grassland,vernal pools. soils,sometimes with is From southern California saltgrass.Also vernal pools. no0suitab a habitatwith n1)within 5 mils, re the Chaenactis and Baia California. 0-425 m elevation. project area. Orcutt's pincushion None None 16.1 Jan-Aug Coastal bluff scrub,coastal Sandy sites.3-100 m Absent:There is no suitable glabriuscula var. orcutfiana dunes. elevation. habitat within the project Chorizanfhe ararea and there are no p ry San Fernando Valley FC SE records within 5 miles. var.Fernandina Saspin ar 1B.1 April- Coastal scrub.Formerly Sandy soils.1,000-1,700 m Absent:Though there is II/ June known from southern elevation. California;currently known suitable habitat within the only from single site at project area,there are no Ahmanson Ranch in records within 5 miles. orylanthus Salt marsh bird's- Thousand Oaks. C Cord emus ssp. beak FE SE 1B.2 May-Oct Coastal salt marsh,coastal Limited to the higher zones Absent:There is no suitable mamarittmus dunes. of the salt marsh habitat.0- habitat within the project 30 m elevation. area and there are no or.: Crossosoma Catalina crossosoma None records within 5 miles. Caososom None 16.2 Feb-May Chaparral and coastal scrub Rocky sea bluffs;elevation Absent:Though there are fomicum range 0-500 m. two recent record (1991,1996)within 5 miles, there is no suitable habitat Dithyrea marittma Beach spectaclepod FSC ST within the project area. 16.1 March- Coastal dunes,coastal Seashores,on sand dunes, Absent:There is no suitable May scrub.Formerly more and sandy places near the habitat within the project widespread in coastal shore.3-50 m elevation. area and there are no habitat in southern records within 5 miles. Dudleya vireos ssp. Island green dudleya None None California. i ls 18.2 Apr-June Coastal bluff scrub and Rocky soils;Elevation range Absent:Though there are Coastal scrub. 5-300 m. two recent record (1990,1992)within 5 miles, • Hordeum intercedens Vernal barley None None there is no suitable habitat area. 3.2 March- Grasslands or vernal pool Saline flats and depressions. Absent:Thoughtthe there is a June basins. record(CNPS-Venice Quad)within 5 miles,there is no suitable habitat within Lasthenia glabrata Coulter's goldfields FSC the project area. ssp.cou/feri None 18.1 Feb- Coastal salt marshes, Usually found on alkaline Absent:There is no June playas,valley and foothill soils in playas,sinks,and habitat within the p ojectable grasslands,vernal pools. grasslands.1-1,400 m area and there are no elevation. records within 5 miles. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT '- l lJtj,t X�L!l J i l i 5> y:-4 Ls( 7 • Sly ' r tii 11<It7 i - r b%z� ri �- k; l`t 1t[rni fig_ ti` z 1 ,'. Lycium brevipes var. Santa Catalina None .`f <: 1 ; hassei Island desert thorn None 18.1 June Coastal bluff scrub,Coastal Elevation range 10-300 m; Not likely to occur:Thought' scrub. presumed extirpated from there is 1 recent(1992) islands. record within 5 miles,there is marginal habitat for this species and it was not Navarrelia fossalis Spreading navarretia FT None 16,1 observed during the survey. April- Vernal pools,chenopod San Diego Hardpan and San Absent:There is no suitable June scrub,marshes and Diego Claypan vernal pools. habitat within the project swamps,playas. In In swales and vernal pools, area and there are no • California,known only from often surrounded by other records within five miles. Riverside and San Diego habitat types.30-1,300 m Nemacaulis Coast woolly-heads None Counties. elevation. deaca var. None 1B.2 April-Sep Coastal dunes. denudate Elevation range 0-100 m. Absent:Though there is one historic(1905)record of this species within 5 miles,there Orcuttia calilornica California orcutt FE is no suitable habitat within �\ 18.1 the project area. grass SE April-Aug Vernal pools.Known only 15-660 m elevation. from southern California and Absent:There a no suitable (<3.........s.:,) Baja. habitat within the project Pentachaeta lyonii Lyon's pentachaeta FE area and there are no SE 18.1 March- records within 5 miles. Chaparral,valley and foothill Rocky to clay soils.30-630 Absent:Though there are Aug grassland;Edges of m elevation.blooming period historic(1910,1889)records clearings in chaparral, Mar-Aug.Historical of this species within 5 usually at the ecotone collection of single plant from miles,there is no suitable between grassland and SCT Isl.was likely habitat within the project chaparral or edges of introduced. Phacelia slellaris Brand's star phacelia None None firebreaks. area. 1B.1 March- Coastal scrub,coastal June Open areas.5-1,515 m Absent:Though there is dunes.Southern California •elevation. and Baja, one historic(1909)record of this species within 5 miles, Potentilla multi�uga Ballona cinquefoil FSCthere is no suitable habitat None 1A within the project area. June- Meadows and seeps. Brackish meadows.0-2 m Absent:There is no suitable Aug Endemic to Los Angeles elevation. ;apparentlyhabitat within the project County; extinct. area and there are no Suaeda esferoa Estuary seablite None None records within 5 miles. 16.2 May-Oct Marshes and swamps. Coastal salt marshes in clay, Absent:Though there is silt,and sand substrates.0- one historic(1904)record of 5 m elevation. this species within 5 miles, there is no suitable habitat • within the project area. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT l !1�1-11 ;. s ir�►t I�•, I., �/1 ra v'_tiri. T �ry�•i; `� iF _ 4iy� 7-- Symphyolnchum San Bernardino aster None None � � Selo/iatum July—Nov Cismontane woodland, In vernally mesic soils near Absent:Though there is Coastal scrub,Lower ditches,streams,springs, marginally suitable habitat montane coniferous forest, 165-1,000 m elevation. within the project area,there Meadows and seeps, Blooms April—Ma Marshes and swamps, y are no records within 5 • Valley and foothill grassland. miles. Southern Coastal _ Bluff Scrub None None CNDDB Ocean-influenced moisture- Plants up to 2 m tall.Most Absent:Not identified within laden winds.Intergrades in plants wood y III and/or less exposed settings with succulent,flowering late the project area. Venturan Coastal Sage winter through spring. Scrub,or on finer-grained soils with Valley and Foothill Grassland.Localized sites along the coast,south of Pt. Conception and on the off- shoreSouthern Coastalill islands. Salt Marsh None None CNDDB Bays,lagoons,and Species include Atri lex Absent:No estuaries along the coast watsonii,Batis maritra, he project atreaentified within K.„,:c::_.,1 from about Point Conception Lycium californicum, to the Mexican border. Monanfhochloe lifloralis, Considerably reduced by Suaeda califomica,and Southern Dune Scrub land development activities. Salicomia subferminalis. None None CNDDB Sand verbena-beach Adapted to continuously bursage series in Sawyer moving sand and extreme the project area.identified within and Keeler-Wolf(1995). aridity.Transitions into coastal sage scrub. Federal State FT=Federal Threatened Other CNPS FT=Federal Tdanen d EE Calliednia listed as FSS=Forest Service List 16=Plants rare or endangered in California and elsewhere FPT=Federal Proposed CT=California listed as Sensitive List 2=Rare,threatened,or endangered in California,but more common Threatened Threatened Management Bureau of nsLand elsewhere. FPE=Federal Proposed CR=California Rare Species CDFS C Sensitive of • p List 3=We need more information about this plant(Review List). Endangered SC=California Species of Forestry Sensitive Dept. 0.1=Seriously endangered in California(more than 80%of occurrences p Forest FPD=Federal Proposed Delisting Special Concern CNDDB=CA Natural threatened/high degree and immediacy of threat) FC=Federal Candidate FP=California Fully Diversity Database 0.2=Fairly endangered in California(20%-80%occurrences threatened) < FD=Federal Delisted Protected (maintained by CDFG) 0.3=Not very endangered in California (<20%of occurrences threatened) CA-Endemic=Plant's native range is confined to California SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT Special-status Wildlife -r! 3"lit l f ' ►040. - , 'akin:, a� ; e r cWt.141 Brennania belkini 1124111111.1111.111111111111111111111111111111111..... �� 'j ��=%t�� >�4 Belkin's dune tabanidin' fly ® Inhabits coastal sand dunes of Southern California. Absent:There is no suitable habitat Carolella busckana within the r Busck's gall moth None project area and there are no -Unknown. records within 5 miles. Unknown. Unknown. Cicindela hirficolis Sandy beach tiger None None • gravida beetle Inhabits areas adjacent to non- brackish water along the coast of Clean,dry,light-colored Absent:Though there are 2 historic sand in the upper zone. (1979)recordsCalifornia from San Francisco Bay Subterranean larvae prefer suitable habitat wit tthin hin the 5 (pro,there is ject area.les no to northern Mexico. moist sand not affected by Cicindela latesignata Western beach None None wave action. Cicind e a er beetle Mudflats and beaches in coastal Southern California. Absent:There is no suitable habitat latesignaCicindela sensi/is Frost's tiger None within the project area and there are no ;/� frosli None records within 5 miles. beetle Inhabits the marine shoreline from Inhabits dark-colored mud in Absent:There is no suitable habitat \ (; J the central California coast south to the lower zone and dried salt within the ro'ec �/ Coelus globosus the salt marshes of San Diego. pans in the uppert 1 t area and there are no Globose dune None zone records within 5 miles. beetleb Inhabitant of coastal sand dune habitat,from Bodega Head in Absent:There is no suitable habitat within the project area and there are no Sonoma County south to Ensenada, Danaus plexippus Monarch butterfly None None Mexico, records within 5 miles. (Wintering Sites)Winter roost sites Roosts located in wind- extend along the coast fromNot likely recordsto d (1989,89 1998)9 there within are northern Mendocino to Baja protected tree groves two recent California,Mexico. f (Eucalyptus,Monterey Pine, 10 miles,there is marginal habitat Cypress),with nectar and adjacent to the project area(roosting Eucosma hennei Henne's water sources nearby. trees). • None None Endemic to the El Segundo dunes Absent:There is no suitable habitat eucosman moth (type locality),Los Angeles County. uphifotes battoides El Segundo blue within the project area and there are no None Restricted to remnant coastal dune Host plant is Eriogonum records Thou h t miles. E Absent: g habitat in Southern California. parvifolium;larvae feed only records within tenmiles,there ois no allyni butterfly here are on the flowers and seeds; suitable coastal dune habitat within the used by adults as major project area. Glaucopsyche Palos Verdes FE nectar source. Glylaucopsyche damus a butterfly Verde None Restricted to the cool,fog-shrouded, Host plant is Astra alus palosverdesensis seaward side of Palos Verdes Hills, trichopodus var.lonchus Absent:rdsThough milesere are several recent Los Angeles County, records within of the project (locoweed). area,there is no suitable habitat within the project area. SWCA Environmental Consultants • FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT .tl -r 1 �f r t $40-11 banslangei Lange's =� i 'fit 8f :' .. %i 't .' Y 9 s El None None Known • �� ..-Segundo dune dune from El Segundo dunes. Presumed extinct. Absent: e .r.. • weevil Absent:There is no suitable habitat Panoquina errans Wandering None None within the project area and there are no (=andering Southern. California coastal salt records within 5 miles. skipper marshes. Requires moist en saltgrass for Absent:There is no suitable habitat larval development. within the project area and there are no Rltaphiomidas El Segundo None None 2001) terminates flower-loving fly Known from El Segundo dunes. records within 10 miles. termterminates Presumed extinct. Absent:Though there is 1 recent suitable noscuta Dorothy's El None record within 5 miles,there is no suitable Trigonosdorothea dorolhea SegundoDorothy's Dune None Coastal sand dunes in Los Angeles habitat:Thee is projectui area. • weevil County. Absent:There is no suitable habitat s. Tryonia imitator Mimic tryonia None None within the project area and there are no records within five Inhabits coastal lagoons,estuaries Found only in permanently Absent:Though theree is 1 historic(date (California( ackishwater and salt marshes,from Sonoma submerged areas in a variety unknown)record within 5 miles,there is snail) County south to San Diego County. of sediment types;able to no suitable habitat within the project withstand a wide range of area. ___ salinities. IIZZIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Gila bicolor Mohave tui chub mohavensis Endemic to the Mohave River basin, Needs deep pools,ponds or Absent:Though there is one historic adapted to alkaline,mineralized waters. slough-like areas.Needs record(1976)of this species within 5 Reptiles and vegetation for spawning. miles,there is no suitable habitat within Amphibians IIIIIIIIIII the project area. IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Actinemys Southwestern marmorata pallida None Inhabits permanent or near) pond turtle y Require basking sites such Absent:There is no suitable habitat permanent bodies of water in many as partially submerged logs, within the project area and there are no habitat types below 6000 ft. vegetation mats,or open records within 5 miles. Phrynosoma Coast horned mud banks. coronatum None Inhabits coastal sage scrub and lizard Prefers friable,rockyor chaparral in arid and semi-arid Absent:Though project is marginalhe climate conditions. shallow sandy soil. habitat within the project area,there are • • __- no records within 5 miles. Agelaius Tricolor Tricolored None species,most Requires open water,Highly colonial blackbird numerous in the Central Valleyand Absent:Though there are recent protective nestingsubstrate records(1980s)within 10 miles,there is vicinity. Largely endemic to California. and foraging area with insect no suitable nesting habitat within the prey within a few km of the project area. Athene cunicularia Burrowing owl None colony. Open,dry annual or perennial Subterranean nester, Thre is no1111 ill grasslands,deserts and scrublands dependent upon burrowing withinit nthe project area and suitable herelaare no characterized by low-growing mammals,especially y records within 10 miles. California ground squirrel. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT ,_,-,1',,,:t''-'';..:. -.,.,'-':? ;:t,'-•4"--. 7•..g'ec,..:1-7•OLO TS:-',''..;-4 ILZ g,tv.1.,:t,.:7,':' :4:-.1q % ;•*7 :;:::'-:,:'-::":';''' '-'rz.:t. ::::27', 41.1.-:: :',.:.;1":';`, f:-.4'*i-li''.i';:',.2-4:::c.'',I. L.;!-. -r.C'; '.:','4F4':,,,,Zigt".7.17.17 "_-'Ff --42„:.' ,:' Charadrius Western snowy jty alexaalexandrines plover(coastal Sand beaches on marine and y f a ns population) tat estuarine shores,also salt Requires sandy,gravelly or Absent:There is no suitable habitat o pondfriable soil substrates for within the project area and there are no nivosulinlevees and the shores of large alkali nesting.Empidonax trail/ii Southwestern lakes. records within 10 miles. Riparian woodlands in southern Breeds principally in(at low Absent:There is no suitable habitat extimus willow flycatcher California. elevations)dense willow, within the project area and there are no cottonwood,and tamarisk records within 10 miles. • Laterallus thickets and woodland along California black None streams and rivers. 'a teicensis rail Mainly inhabits salt-marshes coturniculus bordering larger bays. State listing includes all Absent:There is no suitable habitat P t urn/culus subspecies. within the project area and there are no sandwichensis Gelding's None savannah IUCN:LC, Coastal salt marshes,from Santa records within 10 miles. tat beldingi sparrow FSS,BCC Barbara,south to San Diego Nests in margins of t on and P California brown County. 9 about tidal flats. within the project area and there sent:There is no suitable are no Pelecanus ele mice s pelican ® Coastal salt water,beaches,bays, Feeds on saltwater fishes records within 10 miles. occi californicus ® marshes and on the open ocean. such as anchovy. Absent:rd Though there is one0), n ca/i orn/c calilomicaovy. recent v l \ Coastal Clif record within 10 miles(2000),there is no e scrub in Absent:Though there are recent ca/ilornfca gnatstal CaliforniaC r Obligate permanent resident of suitable habitat within the project area. PolN coastal sage scrub below 2,500 ft in and washecoasts,ongmesas and records within 10 miles of the project southern California. slopes.Prefers stands area,the coastal scrub habitat is dominated by Artemisia severely fragmented and dominated by Sternula anli!larum californica. sugarbush,and therefore does not California least CaliforniaNests along coast from Sanrovide appropriate nesting habitat. lif breeder bare, Absent:Though there is one historic brown! tern(N) Francisco Bay south to northern Baja California, or sparsely vegetated,flat (1977)record within 5 miles and 2 recent substrates: sand beaches, (1987 and 1996)records within 10 miles, Mammals alkali flats,landfills,or paved there is no suitable habitat within the Eumops111111111111111111111111.1111111areas. numm perolis California mastiff None project area. californicus bat Many open,semi-arid to arid • habitats,including conifer and Roosts in crevices in cliff Not likely to occur:Though there is one faces,high buildings,trees historic record(1929)within 10 miles, deciduous woodlands,coastal Lasionycteris scrub,grasslands,chaparral,etc. and tunnels, there is marginally suitable habitat within Silver-haired bat None None noctivagans Primarily coastal and montanesn the project area. forest dweller feeding over streams, sags,buildings,hollg rock w trees, Not r c record to occur:Though therero is one ponds and brushy areas.Duringthereetris marginally suitable ta o miles, crevices,caves,and under is roosting spring and fall migrations the silver- bark. haired bat may be found anywhere habitat within the project area. in California. . SWCA Environmental Consultants FOZOONMEHR PROPERTY . BIOLOGICAL RESOURCES ASSESSMENT f .,.ftlirjr,1 f4g!Z',-.7.!7: 4-q,-::(::`,;J:::,:::, •::-7:: ',..1,: ,-.. .:::::;-.-,- .,,,,f. .]:1:7-.F„, Microtus calilornicus South coast 1RI ti _ ] "� None Meadows.Fresh vegetation stephensi marsh vole e � Construct surface runways Absent:There is no suitable habitat ~ clippings and fecal pellets are and extensive underground within the project area and there are no indicators of the Voles'presence. burrows,and are active throughout the year,chiefly records within 10 miles. Neotoma lepida San Diego desert None at dawn and dusk. e la wan Die IUCN:DD Coastal scrub of southern California Prefers moderate to dense Not likely to occur:Though there is one rat from San Diego County to San Luis canopies;abundant in rock recent record(1991)within 5 miles,there Obispo County, outcrops and rocky cliffs and is marginally suitable habitat within the slopes. Nyctinomops Pocketed free- lemorosaccus tailed bat None IUCN:LC, Arid regions including pine-juniper project area and it is highly disturbed. • WBWG:M woodlands,desert scrub,palmy Rocky areas with high cliffs. Absent:There are no records within 10 miles and there is no suitable habitat oasis,desert wash,and desert Nyctinomops Big free-tailed bat None riparian habitats. within the project area. macrons Lives in rocky areas of desert scrub Roosts by day in crevices on Absent:Though there is one historic or coniferous forests. /�'•. cliff faces record(1983)within ten miles,there is Perognathus no suitable habitat within the project t longimembrisPacific pocketpacificusmouse ®None Narrow coastal lains Mex.To EI area. Segundo) p ( Alluvial sands near ocean. Absent:Though there is one historic Sorex ornatus Southern record(1931)within 10 miles,there is no suitable Sore micus None Confined to the coastal marshes in Dense ground cover,nesting Absent:There tis'nos table habitatsatic area.thin the project California rsh sallmania shrew Los Angeles,Orange,and Ventura sites above mean high tide within the project area and there are no counties. and free from inundation. records within 5 miles. Taxidea laxus American badger None Most abundant in drier open stages Need sufficient food,friable Absent:There is no suitable habitat of shrub,forest,and herbaceous of shrub forest, friable soils. soils,and uncultivated within the project area and there are no ground.Prey on burrowing records within 5 miles. FT=Federal Threatened rodents.Dig burrows. SE=California listed as Endangered WBWG=Western Bat Working Group FE=Federal Endangered FPT=Federal Proposed Threatened ST=California listed as Threatened H=High Priority FPE=Federal Proposed Endangered SR California= Rare Species • • SC=California Species of Special MH=Medium-High Priority FPD=Federal Proposed Delisting Concern Medium Priority • FC=Federal Candidate FP=California Fully Protected Species LM=Low-Medium Priority FD=Federal Delisted WL=California Watch List USBC=The United States Bird Conservation Watch List ABC=The American Bird Conservancy Green List Audubon=WatchList BCC=U.S.Fish and Wildlife Service Birds of Conservation Concern SWCA Environmental Consultants 0 • r i t at ? . 'R 1 -,- r , r t , �x��! ,,3�s� g�� St�r�,j.,'�"�,/� i A11 J, �',` 7a- ,e • _ ;h�1< '!4 �'�t ,,,t, ^'"!'(�r` l fAj t11+_:r u , ;' e ,(. --' •^G " y' t h' , r ,� { '.: �t r �' . ._a' !.�"tit�.r t.�1 t�4 v'!ii h / b 'a , ` " 1 it ��a t you ,1 *. r .ir r ,lt r.- r r'+' Potso Oak-Toyon '''.- r i..r I'hl =dui 1st".,fy'I▪ ir` 44 ; : 4 .: t}}r {,;t,',, ,,,, {j ,e .tt CoastalSageScrub ? {� (''f "{.7t J,di 9F li";r ^t �I f r. .,r' KrI`.• 1. _ t : , 1,E R 1 9 4 rc it i % fh t ', [.. 't r ray �,, /�. 4<p ��• t - 'tReve 1+' - i a `r 0.,lei f r 1*.,-.d .14 Qyt; t t�s•.tt, $� ;" 4r gage S - c.:2`...n '45". t;: .d*�r t. y s + 1 �r Coastal Sage Scrub §� { j t II` ! E.I t A.y..-',:a4 . ,�5 &kj ! 1 - $ 1,r l _ .I'^"` 9. ems. •4 t.;c �� T jtl ,*i f t�1a .V, �� 1' . F�, ;' �+„! i,,}f'}at� yt t. r� z{r`r t ,[.yt,�.• ^`, r , > i 4s "t �. j - - it}'11 ,c(d 1 !"{ 4; vM e a A4= " 1(t r �/ t 05 t v/'` , r Y t '{ I 1'', 4Y, f el ze 10 �,yl Y ..., Ya ,'J., ^'1 L E,r 1` 1�{ y l ! a 1- 1� tf � , ! 7 C P rid- 'Life;'rr1 :' ro L` (' G C� n' fi f "r r,h a;; S,Yq +J�"`M�-p r a�'7G rOP. . - .1 t , t Ct t { , f1 ' Poison Oak-To on I i1 r + 1 t 41 fs��' 1 • t�x'j f };i „• +� Coastal 8a`ge ScrubY;'1 i i r i ,y,tt�. P,.fy c Ar. n° ,•"�+r ..'4 y-i �• c'9 Shed Nth � rtt, 'c lt�,�2T A:=fiat t;,�y�F},',`�� !t ' , 3 s, Ir r i dr 4" ',T r r Uo.- StnJCtUre 4'N, 0) X: r , tt • ▪ r r'r- �w't P '1•.� , 4 r < r y r , -! , 'N ; .; rQ �3 } "' E ,t, a ti rr,i,. a tr��!! y<,�tl��r 19/76u99YWh1 Dr Ajr t� rr�� ?�+1 at fit •if' ,l� � 'e e• Sr , .l y",'1�w_ 4��" y�,P,} �R < ,� t ,�s � h •,t ar '�y A''7`*4 ; �r , 1, f.r f �C Est ' t��4 a�/ "�!;1, 4/1if-,s 'ir t,. I t" '-', e'4•i }gip. , m 1 0.,� +j t ,b.. t �� , t sr a >� r S d �Y O r , t n - & 1 ,d•s'k A, t'1 rL - •r'' t 1 t r ti `'✓riS �.(.}, J ,1 t,: Nonnatrve>,El`" '1 �s r I ! "r t , cvta• 41#1 p} ij{°Y§rlA�sly 4t1'j�k y r {�t1,+1�,+uya Grassland o !iy ` ($ 7- 1 f /,%.-r3•.M ..4;i r ,t/ s ��±�, `+3 7t j", -I••` �` t., ~ , r 4• ,1� ''ty K'f t 5 A' 6, \5. r y. ? ''J' {3'' Y`tt w„ 4g b r1 P- A i 7 ir , 'g Y'i pC��{,,r f j ;•, • rlr 1'4;( rj¢Ky' R tTt -. .sd( 1 ,, -�,••R � ,./..o.11yy• ,,±r , ,,,,, tr„'r,�r..a• .4,,,i t .A „ „ ,. "-, , j �: i:� '1 i�- 9 fi �175 {�1 �' ,r' �!, ,l-rf i"' *Y' i 17 Bu9Y Wh1p Dr / • I rlt rY y-+ ti, 1 � .. Ertl >,1{",r� u r....1, �.f?., .4 $ ,. a:;.4 y ft.r ,J,,&^7! 4, a J 4 `%lei y jo t :Nonnative:/' ;i i u ' .i ? r,�' .,: Y o� ( a{ �edpj Grassland ( i . + ti t. �, r4� �'i ttT"ch 'c['"� alit + 4 Orchard 'a � i +r n• r 'r ^.l _r{] dt 1u°!}r,�-. °.} 3 y�1/y,1 is.�r,. !_ •,'1_ y o.'•,,f- -*-..144 �, �r �r. r�"` L ,L 1 '..::A ` Y "•3 r I y') ii'' el�l i kitiii++1 �j,, ',tt ° r! ; , s�s 2=k' 4/ r CC, y ( to .r It / i ! �(4*A fgi` 1' '• `t f 4 1,y �t Y ro r r g }'y,sK � ti°"a y} !, 7.4/t�# #4i.dol + ',� ; ,,/ ull��a t � Al 1 t°1��y 1f49r aM rc r w l gai - t� f^ic ?` Sig,,+j� t '+� fin ( V��4�Z it .tt 1 , I I Q'tfIf ar ! 1t +,r: !!�. �. tr .M / f 1, 1 to 1'; ti'�1 �• ills ti I. ' , T 11,11 c t rr 4Itg. 1 r e .�; np tSry , t y 4 (°1 ,y 4 i t "".. 1 � W E 1 C�tv 1�-jtf" rK a'M5 7 { >ti RT( rl y, • w,,,,,,i, 11 1 k Va ' T ANT 4 r V` r<!�N�,,"� f -�/ omit = '• V., 5 ,ty 1,0 • , '711 Kfj.1 �rt jU pt it �! �� 4� A .R �.� /E ` ft lr1,try 2i1t'D* G.;�{ rirp 4r f,(4'7"",s4 P( i es Q. .f (� �tr 4• ({lt 9i t§iM'1 ?, v ,� r 4r M 1„ tl r^ Y:, '>jtf yy� 't i., 1 hR'� t. N Jr• ' i } 1 k rl t"k., n ry `f ��,� . y / �t Y -',:_ �h4fifw,} ��. i .14 l•Yf 3 d'.• �A•r `tQ t b y 1• t r Y t �� r V-44 1� Vegetation ` §'I�.� tJ11 ,'^�„ %4 t•.,,r__ _01 ' }° �3e'F Appaloosa Lane `, ! 1 f t' ; , ¢� t _,,, „r'tt (tlty,,z�r�r 1(1('"t Poison deberrOak-ToyC Coastal Sagegrub �',s �j s"r� 14,r Poison Oak Toyon "F �Tn�a r'r r,Y1 4 � rrY g t s.10/ ',r I y k�{rCoast nl Sage Scrub r-1 �:r � 4" "'t'�t.0 F Lemonadeberry a Coastal Sage Scrub ; Y +.,y� f. ti I q , r ,t ,t7it,,,tl t�eP tip/ h'44s, d,4l l.`Yd4 .;,t1,"} I 9 u 4 r4 . i Reve elated Coastal Sage Scrub >.:,,� ! i F ,1. y1, r �m y._j n, rr.V, ,is'�t_k r u,, !�'tr2,M mitt,it 7 er,-,: f r ,1 1 i, 1 ,,1 , , Nonnative Grassland }t 'rr rt '� '1 1�a t', '11 $rltdv� t?. t 4lu S,' ! t H' ,t . R� ' ~'�,• , a 11•1 1, ;�i (,Y t¢`x Orchard ;r �;� 1 ° . S�, ' r P 4i �5j {t +J'f r �.... Transitional Bare Area .' ,a . r Legend ,,,, a,;.,#�: 0 25 50 Meters " r (�_-�Project Area Shed Structure Vegetation Map 0 100 200 Feet �Parcel Bounda es V Grading Lim is Q�Equest anTrail usGS 7.5•Quadrangle: Fozoonmehr Property Torrance,CA 1964(Photorev(sed 19811 Appaloosa Lane ��Stream Land Grant:Los Palos Verdes • , Township;OSS,Range:14 W,Unsectgned lent r:`50'tt Buller SW . ,�� 1:2,400 Aerial Source:TerraSe ver \V�V/ Aenal Date:March 2004 d M•r,o-v,<CrM4•ll ( j) 1 • Aft- BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY EXECUTIVE SUMMARY BIOLOGICAL RESOURCES ASSESSMENT FOR THE FOZOONMEHR PROPERTY DEVELOPMENT PROJECT IN THE CITY OF ROLLING HILLS,Los ANGELES COUNTY,CALIFORNIA Prepared for: Dr.S.Fozoonmehr 28701 Highridge Dr. Rolling Hills Estates, California 90274 Prepared by: Taya K. Cummins and Michael W.Tuma SWCA Environmental Consultants 625 Fair Oaks Boulevard, Suite 190 South Pasadena,California 91030 (626)240-0587 July 7,2008 SWCA Project Number: 14594 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY EXECUTIVE SUMMARY Introduction SWCA Environmental Consultants was retained by Dr. S.Fozoonmehr to conduct a biological resources assessment in support of a grading permit for the proposed construction of a residential home (project) located at 3 Appaloosa Lane in the City of Rolling Hills (City), Los Angeles County, California. The purpose of this assessment is to determine whether the proposed project has the potential to affect sensitive biological resources, and to explore options for mitigating those resources that will comply with the goals and objectives of the City. The project is located on a parcel approximately 8.9 acres in size; project grading is proposed for 2.44 acres of the parcel.In addition,to achieve slope stabilization,grading is also proposed on adjacent properties, including 0.60 acre at 17 Buggy whip Drive and 0.09 acre at 19 Buggy whip Drive. Methods SWCA biologists Michael Tuma (wildlife biologist) and Taya Cummins (botanist) conducted the field visit on June 24,2008,between 8:00 a.m. and 10:30 a.m.,implementing standard biological investigation field methodologies. Current land use on the project's parcel consists of an avocado orchard and a public equestrian trail running along the northern and western boundaries. A blue-line drainage associated with Sepulveda Canyon forms the eastern and southern boundaries of the property. Vegetation within the project area and the adjacent parcels is highly disturbed and consists primarily of Poison Oak-Toyon Coastal Sage Scrub, Lemonadeberry Coastal Sage Scrub, Revegetated Coastal Sage Scrub, Nonnative Grassland,Orchard,and Transitional Bare Areas. Results Because all of the habitats as well as plants and wildlife species identified in the CNDDB and CNPS Rare Plant Inventory searches were determined to either be"absent" or"not likely to occur," no special-status plant species are expected to occur within the project area.In addition,no oak trees were identified within the project area. Project implementation would result in the removal of approximately 0.39 acre of lemonadeberry coastal scrub, 0.52 acre of nonnative grassland, and 2.2 acres of existing orchard habitat during grading operations. These habitats are not considered sensitive. However, impacts to native vegetation communities within the project area,including the poison oak—toyon coastal scrub and the lemonadeberry coastal scrub,contribute to the ongoing loss of habitat within the vicinity as a result of new development. Habitats associated with the Sepulveda Canyon blue-line drainage, specifically the poison oak—toyon habitat, could be considered jurisdictional by the USACE or CDFG. This feature is located outside of grading limits and direct impacts to this drainage are not expected to occur. However, winter rains and construction activities may result in soil erosion and the deposition of debris into this drainage if appropriate erosion control practices are not implemented. The project area likely provides nesting habitat for nesting avian species whose nests and young are protected under the MBTA and California Fish and Game Codes. Construction activities that occur from January 15 through September 15 could result in both direct and indirect impacts to nesting avian species. Any impacts (direct or indirect) that result in the abandonment or destruction of an active nest or the destruction of eggs or young of any protected avian species, including special-status species, would be considered a significant impact under CEQA. SWCA Environmental Consultants iii • 110 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Recommendations To account the loss of approximately 0.39 acre of native lemonadeberry coastal scrub habitat from the proposed project, SWCA recommends that the vegetation be replaced on-site at a 4:1 ratio, for a total of 1.56 acres. Revegetation shall be completed on-site and confined to graded areas and lands immediately adjacent to graded areas. A list of plant species suitable for revegetation is included in this report. To guide the revegetation process,a revegetation plan should be prepared by a qualified professional. Direct impacts to the blue-line Sepulveda Canyon drainage feature, including soil erosion and the deposition of debris into this channel, may result if proper best management practices (BMPs) are not implemented. SWCA recommends that BMPs, such as the installation of drift fences or straw wattles surrounding the grading limits, be implemented prior to grading and remain in place until construction is complete. With the implementation of such BMPs, impacts to this drainage would not be considered significant and a Streambed Alteration Agreement would likely not be required. SWCA recommends that ground-disturbing and vegetation removal activities associated with construction of the project be performed outside of the breeding season for birds, or between September 16 and January 14. If these project activities cannot be implemented during this time period, biological surveys and nest protection measures will be necessary. A-IlL1-4 4 ' _ 0072_ (3©3 ) O SWCA Environmental Consultants iv S Biological Resources Assessment for the Fozoonmehr Property Development Project in the City of Rolling Hills, Los Angeles County, California Prepared for Dr. S. Fozoonmehr Prepared by SWCA Environmental Consultants June 30, 2008 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT FOR THE FOZOONMEHR PROPERTY DEVELOPMENT PROJECT IN THE CITY OF ROLLING HILLS,Los ANGELES COUNTY,CALIFORNIA Prepared for: Dr. S. Fozoonmehr 28701 Highridge Dr. Rolling Hills Estates, California 90274 Prepared by: Taya K. Cummins and Michael W.Tuma SWCA Environmental Consultants 625 Fair Oaks Boulevard, Suite 190 South Pasadena, California 91030 (626)240-0587 June 30,2008 SWCA Project Number: 14594 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY TABLE OF CONTENTS • 1. INTRODUCTION 1 1.1 Purpose of Assessment 1 1.2 Project Location and Description 1 1.3 Regulatory Setting 1 1.3.1 Federal Regulations 1 1.3.2 State Regulations 2 1.3.3 Local Regulations 3 1.4 Environmental Setting 3 2. METHODS 4 2.1 Literature and Database Search 4 2.2 Field Surveys 5 2.3 Assessment of Special-status Species Potential 5 3. RESULTS 6 3.1 Field Survey 6 3.2 Biotic Habitats 6 3.2.1 Biotic Habitats within the Project Area 7 3.3 Assessment of Sensitive Biological Resources 11 3.3.1 Sensitive Habitats 11 3.3.2 Special-status Species 11 4. IMPACT ANALYSIS 14 4.1 Biotic Habitats 14 4.2 Sensitive Habitats 14 4.3 Special-status Plants 14 4.4 Special-status Wildlife 14 4.4.1 Nesting Migratory and Native Avian Species 14 5. RECOMMENDATIONS 15 5.1 Biotic Habitats 15 5.2 Sensitive Habitats 15 5.3 Nesting Migratory and Native Avian Species 16 6. REFERENCES 17 LIST OF TABLES Table 1.Biotic Habitats 6 LIST OF FIGURES Figure 1.Project Location 18 Figure 2.Habitats within the Project Area 19 Figure 3. Special-status Species Occurrences in the Project Area Vicinity 20 SWCA Environmental Consultants iii 1 1111 BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY LIST OF PHOTOGRAPHS Photograph 1.Overview of Fozoonmehr Property from across Sepulveda Canyon(facing west) 4 Photograph 2.Coastal scrub habitat(right)and orchard(left)within grading limits along northwestern boundary of the Fozoonmehr property. 7 Photograph 3.Poison oak—toyon scrub in drainage along southern boundary and blue-gum eucalyptus grove on adjacent parcel(facing east). 8 Photograph 4.Revegetated coastal sage scrub on slope adjacent to the Fozoonmehr property (facing north down Sepulveda Canyon) 9 Photograph 5.Nonnative grassland on adjacent parcels within grading limits. 9 Photograph 6.Overgrown vegetation and fruit tress in the orchard habitat. 10 Photograph 7.Transitional bare area across Appaloosa Lane(facing east from orchard) 11 LIST OF APPENDICES APPENDIX A:Plant and Wildlife Lists APPENDIX B:Assessment of Special-status Species and Sensitive Habitats Within the Project Area Vicinity SWCA Environmental Consultants iv 1 , S • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 1. INTRODUCTION 1.1 PURPOSE OF ASSESSMENT SWCA Environmental Consultants was retained by Dr. S. Fozoonmehr to conduct a biological resources assessment in support of a grading permit for the proposed construction of a residential home(project) in the City of Rolling Hills (City), Los Angeles County, California. The purpose of this assessment is to determine whether the proposed project has the potential to affect sensitive biological resources, and to explore options for mitigating those resources that will comply with the goals and objectives of the City. This biological resources assessment did not include a formal wetland delineation or focused surveys and is not intended to provide sufficient documentation for federal or state permits. 1.2 PROJECT LOCATION AND DESCRIPTION The project is located at 3 Appaloosa Lane in the City of Rolling Hills, Los Angeles County, California. The project area is located approximately 1 mile southwest of the entrance to the gated community of Rolling Hills at the intersection of Palos Verdes Drive North and Portuguese Bend Road/Rolling Hills Road, and 4 miles west of the 110 freeway. The project area, which is situated at an elevation of approximately 250 meters (820 feet) above mean sea level, is located in the San Bernardino Meridian, Township 5 South, Range 14 West, section 4 (33° 45' 51.06" N; 118° 21' 07.48" W) of the 1964 U.S. Geologic Survey(USGS)Torrance 7.5-minute topographic quadrangle,photorevised 1981 (Figure 1). The project is located on a parcel approximately 8.9 acres in size; project grading is proposed for 2.44 acres of the parcel. In addition, to achieve slope stabilization, grading is also proposed on adjacent properties, including 0.60 acre at 17 Buggy whip Drive and 0.09 acre at 19 Buggy whip Drive. Current land use on the project's parcel consists of an avocado orchard and a public equestrian trail running along the northern and western boundaries. A blue-line drainage associated with Sepulveda Canyon forms the eastern and southern boundaries of the property. 1.3 REGULATORY SETTING 1.3.1 Federal Regulations Section 404 of the Clean Water Act(33 Unites States Code [USC] 1344 et seq.) Section 404 of the Clean Water Act(33 USC 1344 et seq.)prohibits discharge of dredged or fill material into "waters of the United States" without a permit from the U.S. Army Corps of Engineers (USACE). The USACE and the U.S.Environmental Protection Agency administer this Act. In addition to traditional navigable waters, the definition of waters of the U.S. includes wetland areas in or adjacent to jurisdictional waters "that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support,and that under normal circumstances do support,a prevalence of vegetation typically adapted for life in saturated soil conditions"(33 Code of Federal Regulations [CFR] 328.3 7b). Projects with impacts to waters of the U.S. may require an individual permit. Small-scale projects with minimal impacts may be authorized by nationwide permits, which have an expedited process compared with the individual permit process.Mitigation of wetland impacts is required as a condition of the Section 404 permit and may include preservation, restoration, or enhancement within the study area and/or off- SWCA Environmental Consultants 1 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY site restoration or enhancement. The characteristics of restored or enhanced wetlands must be equal to or better than those characteristics of affected wetlands to achieve no net loss of wetlands values. Federal Endangered Species Act(ESA; 16 USC 153 et seq.) Applicants for projects that could result in adverse impacts to any federally listed species are required to mitigate potential impacts in consultation with the U.S. Fish and Wildlife Service (USFWS). Adverse impacts, defined as "take," are prohibited except under authorization through Section 7 or Section 10 consultation,and Incidental Take Authorization.During consultations,determinations are made regarding the proposed project and its potential to jeopardize the continued existence of federally listed species,and reasonable and prudent mitigation measures required to avoid such jeopardy. Mitigation is required for adverse impacts to any listed species or candidate species proposed for listing. Take, under federal definition, currently includes actions that could result in"significant habitat modification or degradation" (50 CFR Section 17.3). Candidate species are not protected under ESA. However, the USFWS advises project applicants that candidate species could be elevated to listed status at any time, and should be regarded as species with special consideration. Migratory Bird Treaty Act(MBTA; 16 USC 703 to 711) The MBTA prevents the take of all migratory birds,including their nests and eggs. Bald and Golden Eagle Protection Act(16 USC 668) This act specifically protects bald and golden eagles from being killed or their eggs taken. 1.3.2 State Regulations California Endangered Species Act(CESA; Fish and Game Code Section 2050 et seq.) Species listed under the CESA cannot be taken or harmed, except under specific permit. As currently stated in the act,"take"means to hunt,pursue,catch,capture,or kill or to attempt to do so. Fish and Game Code Sections 3511,4700,5050,and 5515 These sections provide a provision for the protection of bird, mammal, reptile, amphibian, and fish species that are"fully protected."Fully protected animals may not be harmed,taken,or possessed. Fish and Game Code Section 3503 This section states that it is unlawful to take,possess, or needlessly destroy the nest or eggs of any bird, except as otherwise provided by this Code or any regulation made pursuant thereto. Fish and Game Code Section 3503.5 This section provides protection for all birds of prey,including their eggs and nests. SWCA Environmental Consultants 2 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fish and Game Code Section 3513 This section makes it unlawful to take or possess any migratory non-game bird as designated in the MBTA. Fish and Game Code Sections 1900 et seq.,or Native Plant Protection Act This section lists threatened, endangered, and rare plants so designated by the California Fish and Game Commission. Title 14,California Code of Regulations,Sections 670.2 and 670.5 These sections list animals designated as threatened or endangered in California. The California Department of Fish and Game (CDFG) designates species considered to be indicators of regional habitat changes, or candidate species for future state listing, as California species of special concern. Species of special concern do not have special legal status, but are used by the CDFG as a management tool when considering the future use of any land parcel. California Fish and Game Code(Sections 1601 through 1607) These sections prohibit alteration of any lake or streambed, including intermittent and seasonal channels and many artificial channels,without execution of a Streambed Alteration Agreement through the CDFG. This applies to any channel modifications that would be required to meet drainage,transportation or flood control objectives of the project. California Environmental Quality Act(CEQA) CEQA requires that a project's effects on environmental resources must be analyzed and assessed using criteria determined by the lead agency. CEQA defines a rare species in a broader sense than the definitions of threatened, endangered, or California species of concern. Under this definition, CDFG can request additional consideration of species not otherwise protected. 1.3.3 Local Regulations City of Rolling Hills The City of Rolling Hills Planning Department oversees all development permits.As part of this process, they ensure that projects are developed in an environmentally responsible manner. The City's Planning Department seeks to respect native wildlife and natural surroundings by protecting natural resources through project-specific recommendations. 1.4 ENVIRONMENTAL SETTING The project area consists primarily of sloping hillside which drains to an ephemeral creek within Sepulveda Canyon. Vegetation within the project area and the adjacent parcels is highly disturbed and consists primarily of an avocado orchard with a nonnative herbaceous understory, coastal sage scrub vegetation along the outer edges of the property, and ephemeral drainages (Photograph 1). Soils underlying the project area consist of calcareous materials and clay soils. Land uses in the vicinity of the SWCA Environmental Consultants 3 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY project area include large residential lots, equestrian facilities, ruderal fields, and orchards,pastures, and urban development. The Pacific Ocean is located 4 miles south of the project area. • {4. fi ; iY " � "•�� 't 1 iwy . ` F" ,11 w • cam _ Photograph 1.Overview of Fozoonmehr Property from across Sepulveda Canyon(facing west). 2. METHODS 2.1 LITERATURE AND DATABASE SEARCH SWCA biologists reviewed existing sources of information regarding occurrences of special-status species and assessed the potential for occurrence of these species within the project area. Special-status species are plants and animals in one or more of the following categories: ' • Species listed or proposed for listing as threatened or endangered under ESA(50 CFR 17.12 [listed plants],50 CFR 17.11 [listed animals],and various notices in the Federal Register[FR] [proposed species]). • Species that are candidates for possible future listing as threatened or endangered under ESA(67 FR 40657,June 13,2002). • Species listed or proposed for listing by the State of California as threatened or endangered under the California Endangered Species Act(CESA)(14 California Code of Regulations 670.5). • Species that meet the definitions of rare or endangered under CEQA(State CEQA Guidelines Section 15380). • Plants listed as rare under the California Native Plant Protection Act(California Fish and Game Code Section 1900 et seq.). • Plants considered by the California Native Plant Society(CNPS)to be"rare,threatened,or • endangered in California"(Lists 1B and 2 in CNPS 2008). • Plants listed by CNPS as plants about which more information is needed to determine their status and plants of limited distribution(Lists 3 and 4 in CNPS 2008),which may be included as special-status species on the basis of local significance or recent biological information. • Animal species of special concern as listed by CDFG(2006). SWCA Environmental Consultants 4 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY • Animals fully protected in California(California Fish and Game Code Sections 3511 [birds], 4700 [mammals],5050[amphibians and reptiles],and 5515 [fish]). The following sources of information were consulted: • The California Natural Diversity Database(CNDDB)(CNDDB 2008)for the USGS Torrance 7.5-minute quadrangle and eight surrounding quadrangles in the project vicinity,including Venice,Inglewood, South Gate,Redondo Beach,Long Beach,Redondo Beach OE S, San Pedro, and Long Beach OE S;accessed June 23,2008. • CNPS 2007 online Inventory of Rare and Endangered Plants of California for the USGS Torrance 7.5-minute quadrangle and eight surrounding quadrangles in the project vicinity,including Venice,Inglewood,South Gate,Redondo Beach,Long Beach,Redondo Beach OE S, San Pedro, and Long Beach OE S;accessed June 23,2008. • U.S.Fish and Wildlife Service(USFWS 2008a),Ventura Fish&Wildlife Office Endangered and Threatened Species List(Los Angeles County);Accessed June 23,2008. • USFWS Division of Habitat and Resource Conservation,National Wetlands Inventory(NWI) Wetlands Mapper(http://wetlandsfws.er.usgs.gov/NWI/index.html);Accessed June 23,2008 (USFWS 2008b) 2.2 FIELD SURVEYS SWCA biologists walked the project area and visually scanned lands within 150 meters (492 feet) of the project area boundary. Special attention was given to the proposed project grading limits plus a 50-foot buffer around this area to determine whether sensitive habitats or special-status species occur there. Photographs were taken to document biological resources and field conditions. Specific survey methods are described in detail below. All plant species observed during the survey, including special-status species, were identified to species or further using taxonomic nomenclature provided in The Jepson Manual of Higher Plants of California (Hickman 1993). Vegetation communities observed during the survey were described in field notes, verified on aerial photographs, and described according to A Manual of California Vegetation (Sawyer and Keeler-Wolf 1995) and Preliminary Descriptions of the Terrestrial Natural Communities of California (Holland 1986) whenever appropriate. Any potential wetland areas were also described and noted on aerials,but not formally delineated. Wildlife species were recorded during the survey of the project area and were detected by sight and sound. Wildlife habitats were also assessed within the project area. Special attention was given to the potential for nesting bird species, including raptors, that could nest in trees within and adjacent to the project area. All species were identified to the lowest possible taxonomic level. No nocturnal or protocol surveys were conducted. 2.3 ASSESSMENT OF SPECIAL-STATUS SPECIES POTENTIAL Following the database searches and field survey, SWCA assessed the potential for occurrence for special-status species within the project area and its immediate vicinity. This consisted of assessing the biological conditions within the project area and its immediate vicinity and the known occurrences of special-status species within the general vicinity of the project area (nine-quadrangle area). During the assessment,each species was assigned to one of the categories listed below. SWCA Environmental Consultants 5 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Present: Species is known to occur within the study area,based on recent (within 20 years) CNDDB or other records,and/or was observed within the study area during the field survey(s). May occur: Species is known to occur in the vicinity of the study area(based on recent[within 20 years] CNDDB or other records within 5 miles [10 miles for butterfly, bird, and bat species] and/or based on professional expertise specific to the study area or species), and there is suitable habitat within the study area. Alternatively, there is suitable habitat within the study area and the study area limits are within the known range of the species. For avian species, a distinction was made between occurrence potential on the study area as a forager,nester,and/or transient. Not likely to occur: Species is known to occur in the vicinity of the study area(within 5 miles for plants and terrestrial animals or 10 miles for butterfly, bird, and bat species); however, there is poor quality or marginal habitat in the study area. If the species occurs at the study area, it would likely be as a migrant, and the species is not likely to reproduce (breed or nest) within the study area due to a lack of suitable habitat or because the study area is outside of their known breeding range. Absent: There is no suitable habitat for the species within the study area, or the study area is located outside of the known range of the species. Alternatively, a species was surveyed for during the appropriate season with negative results for species occurrence. 3. RESULTS 3.1 FIELD SURVEY SWCA biologists Michael Tuma (wildlife biologist) and Taya Cummins (botanist) conducted the field visit on June 24, 2008, between 8:00 a.m. and 10:30 a.m. Conditions encountered during the survey included average temperatures of 78 degrees Fahrenheit and a slight breeze. 3.2 BIOTIC HABITATS Habitats identified within the project area are mapped in Figure 2 and described in detail below.Acreages of biotic habitats within the project area are provided in Table 1, including graded areas and total acreages.Full lists of plant and wildlife species observed within biotic habitats within the project area and on adjacent lands are presented in Appendix A. Table 1.Biotic Habitats ; l i [o o f met )o oonmeh tug_ h F -I ) 'roper I roper"- i'1 ra +ship IRittisl Graded (! (Gra.el r,,ded ( ra. d ''I 1) 1 fI I) ,»R0) Poison Oak-Toyon 0.24 0 0 0 0 Coastal Sage Scrub Lemonadeberry 2.04 0.22 0.05 0.12 0.39 Coastal Sage Scrub Revegetated Coastal 0.18 0 0 0 0 Sage Scrub Nonnative Grassland 0 0 0.04 0.48 0.52 SWCA Environmental Consultants 6 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Table 1.Biotic Habitats a. ifiTItirricl Cozoonme_ir iozoonmehr 1119atu_ 4j Ouuggr aid Propert Proper; \v up Dr $T4,10 I ri e (0 o a ( 'r 'ci ( 'ra' (COO ti) 4..VC .I °' 1) ,f4'm3s,) f l) jam) Orchard 6.21 2.22 0 0 2.22 Transitional Bare Area 0.22 0 0 0 0 Total 8.89 2.44 0.09 0.60 3.13 3.2.1 Biotic Habitats within the Project Area Lemonadeberry Coastal Scrub Lemonadeberry coastal scrub habitat, a form of Venturan coastal sage scrub (Holland 19.86; Element Code 32300), is dominated by lemonadeberry (Rhus integrifolia) with other common species, including purple sage (Salvia leucophylla), California sagebrush (Artemesia californica), and ashy-leaved buckwheat (Eriogonum cinereum). This habitat was identified along the perimeter of the orchard, along the trail, along Appaloosa Lane, and within the grading limits on the adjacent parcels (Photograph 2). Because of land use and development, this habitat has been highly fragmented in the vicinity of the project. In total, the grading limits include 0.39 acre of lemonadeberry coastal scrub, including 0.22 acre of the Fozoonmehr property, 0.05 acre on the 19 Buggy whip Drive property, and 0.12 acre on the 17 Buggy whip Drive property(Table 1;Figure 2).This habitat is not considered sensitive. ''" sPZ.'. .1 . . - de , . ..„, f. ,: 1, ., -..-4!..„ . ..,...1. n, r t�7 , a , i * `r4 ' Y ( T' AGa� ? s � t ',4..fi , cKCR I ' �� 14 s r• +,'Ira ,:3 ,,•,, ., . ▪y▪ _ .,.. ., rl il?7';'*.lil.s ,, r� t � �r y • rt )j�p{ olk� N�ai � ,"l ' 4 � ,ttP ' s '-',',it tad .f e.W�_t�x. '.-__ ..., ,,.-tl,..1,1 e,�•,. .'..... r.f' Photograph 2.Coastal scrub habitat(right)and orchard(left)within grading limits along northwestern boundary of the Fozoonmehr property. Poison Oak—Toyon Coastal Scrub Poison oak—toyon coastal scrub habitat, a more mesic association within the Venturan coastal sage scrub (Holland 1986; Element Code 32300), is dominated by both poison oak and toyon, which combined SWCA Environmental Consultants 7 r • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY consisted of more that 75 percent of the vegetative cover. Other species observed within this habitat included arroyo willow (Salix lasiolepis), blackberry (Rubus ursinus), and man-root (Marah microcapsule). This habitat was identified in the Sepulveda Canyon drainage along the eastern and southern boundary of the project area (Photograph 3). Much of the drainage on the property has been previously filled along Appaloosa Lane. Remaining drainage features indicate that the drainage is ephemeral, as it did not contain water during the time of the survey. However, during rainfall events,this drainage collects all runoff from the project area,carrying it off-site in a northerly direction.The drainage is identified as a blue-line stream in the USGS Torrance topographic quadrangle and may be considered potentially jurisdictional waters of the United States by CDFG or USACE. This habitat occurs over 0.24 acre of the Fozoonmehr property,but is located outside of the proposed grading limits(Table 1;Figure 2). This habitat is not considered sensitive. e i i ,,,,„„ , ..., ,, .14 : ..-li, ,,,, ,,,, r b rst,k Y , . - 3 tt S dT"t�. 5 .. . 4 .,i r tr, ' ,y. " t #..t R ^. 4. a • a s I: , ,,. .- ' r y �+ �� r a - .r, '��+ 1.^a.v � - 'Y1,�-`k x�.,. f ti>r�.r: P0. �i / to 1SI 4 +, �f*Y��•" q. } Alik k s,� '�d Tl* i � Y 4a`. ,,JJ ��'�§'�'T gyp, i r : 1 kaI. '' tit a"�.f +a. • 1., 6..t,..l .: A. ,4,,,' ',,T.,".," ''' '*f '.!:-,, ',;.-,.:,,: ": Ef,,,,•°-;'.. ., -`,[ ^�v Si µ ., ,''f .,; ' , 7..i F j t sty, {, Photograph 3.Poison oak—toyon scrub in drainage along southern boundary and blue-gum eucalyptus grove on adjacent parcel(facing east). Revegetated Coastal Sage Scrub The slope located in the northeastern corner of the Fozoonmehr property has recently been revegetated with coastal sage scrub species. Species used in this planting include purple sage, California sagebrush, California encelia (Encelia californica), and coyotebrush (Baccharis pilularis). This revegetation effort was completed in association with grading that occurred on the Fozoonmehr property as a result of a residential development on the adjacent parcel (Photograph 4). This habitat occurs over 0.18 acre of the Fozoonmehr property, but is located outside of the proposed grading limits (Table 1; Figure 2). This habitat is not considered sensitive. SWCA Environmental Consultants 8 I 0 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY fi; 4 ,,A sty ' 0a �-N y ,' .. 7 '..t ;,14 .�-�a '`5•p-ems" ' ,,s -vf �"*"rrO� .,,0 S °'�a.pw, :,(his.- 3t;% $'fit.,-'t•° �- �- r,''', . r ''rM • L kli :, (y5., '1.i r 4-' a' r,.Y° r fti'"tf. ' .1,,e' Photograph 4.Revegetated coastal sage scrub on slope adjacent to the Fozoonmehr property (facing north down Sepulveda Canyon). Nonnative Grassland Nonnative grassland, classified as California annual grassland by Sawyer and Keeler-Wolf (1995), consists of nonnative herbaceous species. This habitat was identified on an abandoned orchard site within the grading limits and the surrounding 50-foot buffer of the adjacent parcels(Photograph 5).Plant species identified in this habitat included brome grasses (Bromus spp.), black mustard, slender wild oats, and redstem filaree and included a few scattered mature peach (Prunus persica) trees. This habitat was not identified on the Fozoonmehr property but was present within the grading limits on adjacent parcels, including 0.04 acre of the 19 Buggy whip Drive property and 0.60 acre of the 17 Buggy whip Drive property(Table 1;Figure 2).This habitat is not considered sensitive. � S '—� fir} �� M ri _,' ., `y fir, „. r t' k , 'Y 1 YA 4 + am' 'yi • _ •a Photograph 5.Nonnative grassland on adjacent parcels within grading limits. SWCA Environmental Consultants 9 • II BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Orchard Most of the Fozoonmehr property consists of an avocado (Persea americana) orchard. The understory consists of weedy species, including black mustard (Brassica nigra) and slender wild oat (Avena barbata). Other species of fruit trees and volunteer native species common to the surrounding coastal scrub habitats are scattered throughout the orchard (Photograph 6). This habitat consists of 6.21 acres of the Fozoonmehr property,including 2.22 acres within the grading limits (Table 1; Figure 2). This habitat is not considered sensitive. A e R•'.4 7. a -..5. P. .p'a&.+fir ,, `t« ' sue^ ! ti11 ;'�,• � c y 4 t ;i.,,,,:-. ;„ ,,:yt,i-jo...,, ,:.:;,.,, ,.... : ,,,.,, ,,!t '., ,. ;, ,,,,,-;_,up„,-,4&;-.,... - ' ,, A.,,,' ,.':' t ' - '' '''1 1°`-. " r /1. 1 tit 4,* 4 , t , • ,f:-•,-, )s,,,I.,,,, Photograph 6.Overgrown vegetation and fruit tress in the orchard habitat. Transitional Bare Area Transitional bare areas are defined as areas which are in transition from one land use activity to another (Anderson et al. 1976). Transitional bare areas were identified along the east side of Appaloosa Lane,but still within the Fozoonmehr property(Photograph 7).This habitat was void of vegetation aside from a few opportunistic species such as redstem filaree and black mustard. This habitat consists of 0.22 acre of the Fozoonmehr property, and no grading is expected to occur within this habitat (Table 1; Figure 2). This habitat is not considered sensitive. SWCA Environmental Consultants 10 I • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY fir ti k y� �qv;.:_1- ,-','s t; r 'R . °,J. ,..,...'A.-_ '! ..- J _ ..�4. .rl,r ...:1 Photograph 7.Transitional bare area across Appaloosa Lane(facing east from orchard). 3.3 ASSESSMENT OF SENSITIVE BIOLOGICAL RESOURCES A list of special-status species known to occur within the vicinity of the study area was generated from the CNDDB and the CNPS 2007 online Inventory of Rare and Endangered Plants of California.A total of 60 special-status species, including 25 plants and 35 wildlife species, as well as three sensitive habitats were identified within the nine-quadrangle area in the vicinity of the project area(Appendix B; Figure 3). Provided below are expanded descriptions for those species or habitats that were either present within the project area,or their occurrence potential was evaluated as"may occur"within the project area. 3.3.1 Sensitive Habitats During the field survey, the potential for sensitive and potentially jurisdictional habitats was assessed within the project area. A search of the CNDDB records for sensitive habitats was also conducted,which identified three sensitive habitats within the nine-quadrangle area, including southern coastal bluff scrub, southern coastal salt marsh, and southern dune scrub. None of these habitats were identified within the project area during the survey. However,habitats associated with the Sepulveda Canyon drainage may be considered jurisdictional by CDFG or USACE. 3.3.2 Special-status Species Special-status Plants During the field survey,habitats capable of supporting special-status plant species were evaluated within the project area. Based on the analysis provided in Appendix B, the following species were eliminated from further consideration because(1)there is no suitable habitat within the project area and there are no local records (within 5 miles) in the vicinity of the project area and/or (2) the project area is outside of their known range. Alternatively, although there are records of these species within the project's vicinity (within 5 miles), there is no suitable habitat within the project area to support the occurrence of these species.These species were assessed as"absent": SWCA Environmental Consultants 11 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY • Ventura marsh milk-vetch(Astragalus pycnostachyus var.lanosissimus) • Coastal dunes milk-vetch(Astragalus tener var.titi) • Orcutt's pincushion(Chaenactis glabriuscula var.orcuttiana) • Salt marsh bird's-beak(Cordylanthus maritimus ssp.maritimus) • Beach spectaclepod(Dithyrea maritima) • Coulter's goldfields(Lasthenia glabrata ssp.coulteri) • Spreading navarretia(Navarretia fossalis) • California orcutt grass(Orcuttia californica) • Ballona cinquefoil(Potentilla multijuga) • Lewis'evening-primrose(Camissonia lewisii) • Lyon's pentachaeta(Pentachaeta lyonii) • Island green dudleya(Dudleya virens ssp.insularis) • Catalina crossosoma(Crossosoma californicum) • Southern tarplant(Centromadia[=Hemizonia]parryi ssp.australis) • Vernal barley(Hordeum intercedens) • San Bernardino aster(Symphyotrichum defoliatum) • Estuary seablite (Suaeda esteroa) • Coast woolly-heads(Nemacaulis denudata var.denudata) • Brand's star phacelia(Phacelia stellaris) • San Fernando Valley spineflower(Chorizanthe parryi var.fernandina) Based on the analysis provided in Appendix B, the following species were eliminated from further consideration either because(1)there are no recent local records of their occurrence in the vicinity of the project area, as determined through the CNDDB; or (2) although there are recent local records of their occurrence within the vicinity of the project area,habitat within the project area was determined to be to be marginal,limited,or otherwise unfavorable;or(3)the site does not likely provide suitable habitat for a sustaining population of this species.These species were assessed as"not likely to occur": • Aphanisma(Aphanisma blitoides) • South coast saltscale(Atriplex pacifica) • Parish's brittlescale (Atriplex parishii) • Davidson's saltscale(Atriplex serenana var.davidsonii) • Santa Catalina Island desert thorn(Lycium brevipes var.hassei) Because all of the plants identified in the CNDDB and CNPS Rare Plant Inventory searches were determined to either be "absent" or"not likely to occur,"no special-status plant species are expected to occur within the project area.In addition,no oak trees were identified within the project area. Special-status Wildlife During the field survey, habitats capable of supporting special-status wildlife species were evaluated within the project area. Based on the analysis provided in Appendix B, the following species were eliminated from further consideration because(1)there is no suitable habitat within the project area AND there are no local records(within 5 miles or 10 miles for butterfly,bird, and bat species)in the vicinity of the project area, and/or(2) the project area is outside of their known range. Alternatively, although there SWCA Environmental Consultants 12 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY are records of these species within the project's vicinity(within 5 miles or 10 miles for butterfly,bird,and bat species),there is no suitable habitat within the project area to support the occurrence of these species. These species were assessed as"absent:" • Belkin's dune tabanid fly(Brennania belkini) • Sandy beach tiger beetle(Cicindela hirticolis gravida) • Western beach tiger beetle(Cicindela latesignata latesignata) • Frost's tiger beetle(Cicindela sensilis frosti) • Globose dune beetle(Coelus globosus) • Henne's eucosman moth(Eucosma hennei) • El Segundo blue butterfly(Euphilotes battoides allyni) • Palos Verdes blue butterfly(Glaucopsyche lygdamus palosverdesensis) • Lange's El Segundo Dune Weevil(Onychobaris langei) • Wandering(=saltmarsh)skipper (Panoquina errans) • El Segundo flower-loving fly(Rhaphiomidas terminatus terminatus) • Dorothy's El Segundo dune weevil(Trigonoscuta dorothea dorothea) • Mimic tryonia(California brackishwater snail)(Tryonia imitator) • Mohave tui chub(Gila bicolor mohavensis) • Southwestern pond turtle(Actinemys marmorata pallida) • Coast horned lizard(Phrynosoma coronatum) • Tricolored blackbird(Agelaius tricolor) • Burrowing owl (Athene cunicularia) • Western snowy plover(Charadrius alexandrinus nivosus) • Southwestern willow flycatcher (Empidonax traillii extimus) • California black rail(Laterallus jamaicensis coturniculus) • Belding's savannah sparrow(Passerculus sandwichensis beldingi) • California brown pelican(Pelecanus occidentalis californicus) • Coastal California gnatcatcher(Polioptila californica californica) • California least tern(Sternula antillarum browni) • South coast marsh vole(Microtus californicus stephensi) • Pocketed free-tailed bat (Nyctinomops femorosaccus) • Big free-tailed bat(Nyctinomops macrotis) • Pacific pocket mouse(Perognathus longimembris pacificus) • Southern California saltmarsh shrew(Sorex ornatus salicornicus) • American badger(Taxidea taxus) Based on the analysis provided in Appendix B, the following species were eliminated from further consideration either because(1)there are no recent local records of their occurrence in the vicinity of the project area, as determined through the CNDDB; or (2) although there are recent local records of their occurrence within the vicinity of the project area, habitat within the project area was determined to be to be marginal,limited,or otherwise unfavorable;or(3)the site does not likely provide suitable habitat for a sustaining population of this species. In addition, avian species may have been eliminated from further consideration because (1) they would use the project area only as a migrant or (2) they are not likely to SWCA Environmental Consultants 13 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY reside or reproduce there due to a lack of appropriate habitat or because the project area is outside of their known breeding range.These species were assessed as"not likely to occur": • Monarch butterfly(Danaus plexippus) • California mastiff bat(Eumops perotis californicus) • Silver-haired bat(Lasionycteris noctivagans) • San Diego desert woodrat(Neotoma lepida intermedia) Based on the analysis provided in Appendix B, no special-status wildlife species are expected to occur within the project area. 4. IMPACT ANALYSIS 4.1 BIOTIC HABITATS Project implementation would result in the removal of approximately 0.39 acre of lemonadeberry coastal scrub, 0.52 acre of nonnative grassland, and 2.2 acres of existing orchard habitat during grading operations. These habitats are not considered sensitive. However, impacts to native vegetation communities within the project area,including the poison oak—toyon coastal scrub and the lemonadeberry coastal scrub,contribute to the ongoing loss of habitat within the vicinity as a result of new development. 4.2 SENSITIVE HABITATS No sensitive habitats listed by CNDDB were identified within the project area. In addition, habitats associated with the Sepulveda Canyon blue-line drainage,specifically the poison oak—toyon habitat,could be considered jurisdictional by the USACE of CDFG. The actual drainage feature has been filled along most of the reach located on the Fozoonmehr property. It is located outside of grading limits but impacts to this drainage,including deposition of debris as a result of surface runoff,may occur. 4.3 SPECIAL-STATUS PLANTS No special-status plant species listed by CNPS or CNDDB were determined to occur within the project area.Therefore,no impacts to special-status plant species are expected as the result of implementation of the proposed project. 4.4 SPECIAL-STATUS WILDLIFE No special-status wildlife species listed by CNDDB were determined to occur within the project area. Therefore,no impacts to special-status wildlife species are expected as the result of implementation of the proposed project. 4.4.1 Nesting Migratory and Native Avian Species The project area likely provides nesting habitat for nesting avian species whose nests and young are protected under the MBTA and California Fish and Game Codes. Construction activities associated with the proposed project that result in ground disturbance and/or the removal of vegetation could have both direct and indirect impacts to these sensitive resources. SWCA Environmental Consultants 14 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY The breeding season for birds generally occurs from January 15 through September 15; implementation of the project during this period could result in both direct and indirect impacts to nesting avian species. Direct project impacts would include the destruction of active nests, eggs, or young located within vegetation removed within the proposed project. Indirect impacts would include noise and disturbance associated with the construction activities that cause birds in adjacent habitats to abandon their nests.Any impacts (direct or indirect) that result in the abandonment or destruction of an active nest or the destruction of eggs or young of any protected avian species, including special-status species, would be considered a significant impact under CEQA. 5. RECOMMENDATIONS 5.1 BIOTIC HABITATS To account the loss of approximately 0.39 acre of native lemonadeberry coastal scrub habitat from the proposed project, SWCA recommends that the vegetation be replaced on-site at a 4:1 ratio, for a total of 1.56 acres. Revegetation shall be completed on-site and confined to graded areas and lands immediately adjacent to graded areas. To guide this process, a revegetation plan should be prepared by a qualified professional.The plan should include the following details: • Project Description—Project description,purpose and goals of revegetation,and environmental setting. • Revegetation Design—Planting plan and irrigation plan layouts,native vegetation palette. Irrigation system should be temporary(three years). • Plant Materials—Revegetation materials should consist of site-specific species identified in the botanical inventory as appropriate for revegetation efforts.Plant materials should be derived from local native sources.A mixture of hydroseeding and container planting is recommended. • Implementation Instructions—Detailed guide to planting,irrigation schedule,and erosion control methods and procedures.Installation and maintenance should be conducted by a qualified landscape contractor or other qualified professional. • Maintenance—Long-term(three-year)maintenance plan,including weed control,mortality replacement,and irrigation issues. • Monitoring—A biological monitor shall visit the site on a bi-annual basis to ensure that revegetation efforts are meeting success criteria and to make maintenance recommendations. • Success Criteria—Success criteria shall be established for annual assessment for such items as native plant cover,weed cover,species diversity and recruitment,survivorship,and plant density. Identify remedial actions if identifiable problems arise or success goals are not met. • Reporting—At the end of the project,a summary report of revegetation efforts shall be submitted to the City. 5.2 SENSITIVE HABITATS The poison oak—toyon habitat associated with the blue-line Sepulveda Canyon drainage feature could be considered jurisdictional.To avoid impacts to this habitat,erosion control measures,including drift fences or straw wattles, should be put in place around the habitat to minimize surface runoff and deposition of debris. SWCA Environmental Consultants 15 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 5.3 NESTING MIGRATORY AND NATIVE AVIAN SPECIES SWCA recommends that ground-disturbing and vegetation removal activities associated with construction of the project be performed outside of the breeding season for birds, or between September 16 and January 14.If these project activities cannot be implemented during this time period,the project applicant should retain a qualified biologist to perform pre-construction nest surveys to identify active nests within and adjacent to(up to 500 feet)the project area. Any active non-raptor nests identified within the project area or within 300 feet of the project area should be marked with a 300-foot buffer, and the buffer area would need to be avoided by construction activities until a qualified biologist determines that the chicks have fledged. Active raptor nests within the project area or within 500 feet of the project area should be marked with a 500-foot buffer and the buffer avoided until a qualified biologist determines that the chicks have fledged. If the 300-foot buffer for non-raptor nests or 500-foot buffer for raptor nests cannot be avoided during construction of the project, the project applicant should retain a qualified biologist to monitor the nests on a daily basis during construction to ensure that the nests do not fail as the result of noise generated by the construction. The biological monitor should have the authority to halt construction if the construction activities cause negative effects, such as the adults abandoning the nest or chicks falling from the nest. SWCA Environmental Consultants 16 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 6. REFERENCES California Department of Fish and Game(CDFG).2006. Special Animals. State of California,The Resources Agency,Department of Fish and Game,Natural Heritage Division,Natural Diversity Data Base,February 2006 update. California Native Plant Society(CNPS).2008.Inventory of Rare and Endangered Plants(online edition, v7-07d).California Native Plant Society.Sacramento,California,USA. <http://www.cnps.org/inventory>Accessed June 23,2008. California Natural Diversity Database(CNDDB).2008.RAREFIND,Natural Heritage Division. California Department of Fish and Game,State of California. <http://www.dfg.ca.gov/biogeodata/cnddb/>Accessed June 23,2008. Hickman,J. C.,editor. 1993.The Jepson Manual.University of California Press,Berkeley,California, USA. Holland,R.F. 1986. Preliminary Descriptions of the Terrestrial natural Communities of California. State of California,The Resources Agency,Nongame Heritage Program,Department of Fish and Game,Sacramento,California,USA. Sawyer,J.O.,and T.Keeler-Wolf. 1995.A Manual of California Vegetation.California Native Plant Society. Sacramento,California,USA. U. S.Fish and Wildlife Service(USFWS).2008a.Ventura Fish&Wildlife Office Endangered and Threatened Species List(Los Angeles County).U.S.Fish and Wildlife Service,Carlsbad, California,USA.<http://www.fws.gov/ventura/CFWO_Species_List.htm>Accessed June 23, 2008. U.S.Fish and Wildlife Service(USFWS).2008b.National Wetlands Inventory Online Mapper. <http://www.fws.gov/nwi/>Accessed June 23,2008. SWCA Environmental Consultants 17 • . BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY APPENDIX A: Plant and Wildlife Lists SWCA Environmental Consultants • I 'nos X) 11 •�.z„,,.v . ,A°.*Tan Kem San 1`�� ! S Count£y Da Sch 4 �Ytr� t7-., s- /• / v.BNl 42t ,a \ ., Los Bernardino NIB.',0 '. �ir�1_S .. �, lt, 44\p�6` , Ventura Angeles � . �`` J� 7 _ ProJecl locatl�\ Riverside r l` -` l e1 .mil -I% - � .__ ry �4*' •/ bOrange �� 1� - VV�'re, 1 t. L.l29 e; .:♦� • ,rah C 4 `\ r r �7 San Diego .. I California • r� } "' ' . 4 r .. . y � 1,") ✓''- t� I kw- ¢M �.`,.. Jot .t // 4 74,J `r�� ; — 71\ ,,,L,:77.7N':.,. •/,‘..fAir,-\ .:.-7, -:7.4-': ,,-.1r17.-- 7 . 7-77yrii, ,7\ 0 7) ...(N\N_ „��\`'.k..4., • 4 tr' (� � .t — ''' � it), �r'i fi ,�F s• v- ithoop, +-0.enter `,!% �`'lk- ?�/ ' '�`0 2-# y., llJ• i ' fik „ .. AL ...,........ '.1%.,t.j'''.4,..,,.....24.:C:,..4 0 7%N.., 3,* :‘•/lc/.7.... ./-*4--...2,1- :,_.. .e..„:„.. .....e.„..v:,.:..,._ .• . -, ,,,,,„,,,.. ,,...,__,„) ,,,,,,,..„,,,,b,,,, t..„., .,.., _,. _.,,r. ,,,_.„,,,A,..:. .:._;,_ 7 • ,,,,,,,,,...„,,,,_,,,, . t. ,,.. , .... ., . v, . ,,.,, ,.„ r.,,,.. ---)„,...,,,--, 2_,,..,...„,_,, , .,..„,•,,,.... .._,,„„...„. . . : . _ , ,.,...;,,, . . . ,,,.. . . „ . ,/,_ ,...!: . . 1.,.. . i;..) / ..:''...' 1. ' • it e:I:. . .›.:".", .. ' ''Z• i'''' ': ',1.'1:,'1 ' /\ '.;‘ It.. ', ' ,7 ' .i.''i''''':'. .-Vf--II)').)(( :"-t: _____I) -': :': -''',',. S':—.. . ." I _ It., . ' '1 47;:k) ' ''t<_( , /---7.,•,‘,--:;_t'-'2: ,e(=.-: '-- - • ---..-.. ." • i\ .'C is g I: ,,. - .► y !i' git uu1116.1. - : -. ' • ✓ Fiae`-Sch 0% i ji�'�- 4 `` f �-�4� 10 //'? ,7;;V,�� : • i� .� • > 0 S P4 • __ • ••. .4' a tea. U,ri' .rt l . Cet s�T.a p '•�� '' ,CS'.5.1 . �„•ljr ,,,,k,..7.., a�'� /. - . I 1 ,11 .. • •r -1 (_,_„,.,__'.-offz = 0 at-I�24858�J, *'—• 1-��;• •4 ,I . 'i•. ; '�;1' ` _ v ,rx Imo �.',•,,, ( •,. Jx 1 ��•i� it ,. . ' `ems a` 1 „ _ f yhn ": •. ✓ �,,j , .. JF "a,', ,,' \!..2 -,:::; , '1,•s•-•,..t::"\ -- ,..Yr 1 t•)Z.::_,, ') ,' ' !,,,--a--•'‘, ,.,t:,''''''''''0,..„,'\!..t ,r , ,,,--:. .. , .,_,- 'i ' a � _ , " /r____. F.., - . • •/1 J‘RCts .t 1.. �+-¢� " 1 / . -\ * Y 1 • \i�a.'�o4. nk`E x; di . 1/7-.? \� (.„ y o , :,(0-:-.. G� -L\ ,,,\ 0 250 Meters N Legend Project Location Map 0 Project Area o too0 2,000 Feet ��• Apaloosa Lane Project USGS n 7.e, Q 1964(gie: ' W V CL i Torrance,CA 1964(PhotoreNsed 1981) ��fff Land Grant:Los Palos Verdes Township:05S,Range:14W,Unsectioned 1:24,000 CNVIRONMCNrAL CONSULTANTS Figure 1 • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY 4 t, Toyon iM r 44-1 Cal..r Scrub n 7 +°, rl. r ''" d z Revegetated fal Sage Scrub = - a e 1/7 , 1 - ce" Stled// / ; Structure,i ti /517). 121. !II:E)'-'- 'I" ,/// / 1 t. ,// // /f ,/:////" 4 .. aijL1,i) Orchard '. tVt v,„ . "'fi k 1.- y P t j '. ,x - _ r' Vegetation , 4 . - MO Appaloosa Lane �k` III PoisonOak-Toyon Coastal Sage Scrub i w. (nnlIt...al�t�'iJ IIII Lemonadeberry Coastal Sage Scrub Revegetated Coastal Sage Scrub III iNonnative Grassland Orchard ..... tt ` S Transitional Bare Area Legend Vegetation Map 0 25 50 Meters N .� Q Proiect Area i rr-1"50-ft Buffer 0 100 200 Feet Q Parc&Boundaries * Shed Structure USGS 7 5 Quadrangle Fozoonmehr Property ',n1 Grading Limits. Torrance,CA 1964(Phdorevixd 1981) 11111 .EquestnanTrail Land Grant:Los Palos Verdes -Appaloosa Lane SWCA Township:05S,Rarge'.14W.Unsectoned 1:2,400 Aerial Source'TorraServer Aerial Date:March 2004 Figure 2.Habitats within the Project Area SWCA Environmental Consultants 19 • • � ,,F .. ,„.„....„_,,,,:,,,,. .....„ .xz tfas 4! "F' z+ f;•5' x '€+' iyi + ' 494 1 E r � ' i f +� am-1. qa , 740,,F t u _e stb3 Y 1, ,n�, ' . < 'yS+a a c r. J'L,A!-.a a, n -`4 T�-t05,7 x �' � ' 7;; At7i44` �p Ef ' , - ." aa ih 4 ,P� �. t �� o t 'A *L . 4Ltl ''ail ,'+ ' :4'✓ y " 2r '' , a ',,,74,.. ,,rm ,r ;.,„-, .�:', ( k , - °et t.t &' .. f. t"'Ea ' ' € i,� x -....d ,3 Mt4 i,c . ti. Se:Ik " ¢ set rLi Y 1 E �jai I I$ ° a � + # �' 4(MMci . "r 'i J '.si i tw.a L .— I- -` ? a a � k 'w �, ba¢ �4 42A`6M au :jf A ziriii -i3.$' 41 �� iiek Ate- t-aii t Y, NSF"dglait_ `♦� 1' 'd' k . a 7,1-, S as ,4,,"""".° .t} ,, ," x{ or",.,, `'§ra,.r �'!�.pj viiia rat "S. L .a,nalee.,e N. `"`.FAwn.l= .. tg, .,- ,- 7 : A- : rt' ' aye i� L o w, a - x•o- ;fir r : L 1s ,�� o x. i >ero,e.em t,�a . �f a..- z � j ♦ j m 1, f‹ref,".''' r", .`,.1,-, ttp j I # r- p+,�61'' + �" a'N'± ,sl,rll�! witi esewnm e..ea...mi ° �., �..: f ff 'S' # anre w wn i 'S1 a,aw,mro...,.IreN , - Ma•4 ' v ! N'' 1 ['at`; ,i ,y'1( "I. .. � • 1 ""wn, � , "'� 9 cacti Nara .: („ w�# ' & d>- m', l i e .. A err a � {{ : n wuaN /`�, .1._ as a cw,„,..e,mm3,lun .w I +aaNtwm , e. r. sMtl ase,aiVlera apnmcma • .� ! { •,•�,' vmwame ,I`♦'♦ C.someex ,su Sante CeleLns lebna 0e®MM1om ,, (Mt. LVm agmacM1eee ;\,\, s Been...re \ au a a•n.4v. Sal I,egodesed woodFat .\ i �, i ♦ i Lepen° C (' Special-Status o z,000 4,000Meters Oprge tAee SWCA Species Occurrences 0 7�25 2.5 Miles C.)SMiles 6uRer uses�.swaarana. ospae0-Slaws speciee or�urrences Apaloosa Lane Project -.ram...."(pnabnvrtl,Bat) aloe V.., e� �,+ene b oosaR:n,.:,.w.0 aaaea es,aoo Wuab.H '"T Figure 2 • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY APPENDIX B: Assessment of Special-status Species and Sensitive Habitats Within the Project Area Vicinity SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fozoonmehr Property—Partial List of Plants,June 24,2008 •Olson Oa — Lemonade, Re ege a ed onna t :e . st ion:I ram, D C• 0,IMIED kUiat oyonGEID ber � Orc and C } Gymnosperms * Pinus sp. Pine tree Pinaceae X Angiosperm-Dinocotyledons Malosma laurina Laurel sumac Anacardiaceae X • Rhus integrifolia Lemonade-berry Anacardiaceae X X X • * Schinus molle Peruvian pepper Anacardiaceae X X Schinus * terebinthifolius Brazillian pepper Anacardiaceae X X Toxicodendron diversilobum Poison oak Anacardiaceae X X * Bidens pilosa Beggar's tick Asteraceae X X X X Daucus pusillus Wild carrot Apiaceae X X X X * Foeniculum vulgare Fennel Apiaceae X * Nerium oleander Oleander Apocynaceae X Asclepias Narrow-leaf • fascicularis milkweed Asclepidaceae X Artemesia California • califonica sagebrush Asteraceae X X Baccharis pilularis Coyotebrush Asteraceae X X X • Encelia califomica California encelia Asteraceae X X X Two-tone 1 • Gnaphalium bicolor everlasting Asteraceae X X X X X11111 Helianthus annuus Common sunflower Asteraceae X X • lsocoma menziesii Coast goldenbush Asteraceae X * Lactuca seriola Prickly lettuce Asteraceae X X X X • Malacothrix saxitilis Cliff aster Asteraceae X * Piciris echioides Bristly ox-tongue Asteraceae X X X * Silibum marianum Milk thistle Asteraceae X * Brassica nigra Black mustard Brassicaceae X X X X * Raphanus sativus Wild radish Brassicaceae X SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fozoonmehr Property—Partial List of Plants,June 24,2008 •oiso_ - * r Revegeta ed Norma we fans' Tonal C i f * n•i)t'i lgj o on@D@ berry CS al@ @Wi t) GOV) C. Lonicera • subspicata Honeysuckle Caprifoliaceae X Sambucus • mexicana Mexican elderberry Caprifoliaceae X X Chenopodium * album Lamb's quarters Chenopodiaceae III X X X Convovulus * arvensis Field bindweed Convovulaceae X Marah macrocapus Man-root Cucurbitaceae X X X Lotus scoparius Deer weed Fabaceae X X * Melilotus indicus Yellow sweetclover Fabaceae X X X X _ * Vicia villosa Common vetch Fabaceae X X Erodium cicutarium Redstem fillaree Geraniaceae X X X * Geranium mole Dove's foot Geraniaceae X X • Salvia leucophylla Purple sage Lamiaceae X X * Persea americana Avocado(cultivars) Lauraceae X - * Malva parvifolia Cheeseweed Malvaceae X X * 0/ea europa European olive Oleaceae X Eriogonum Ashy-leaved • cinereum buckwheat Polygonaceae X Eriogonum California • • fasciculatum buckwheat Polygonaceae X X Heteromeles • arbutifolia Toyon Rosaceae X X * Prunus armeniaca Apricot Rosaceae X * Prunus persica Peach Rosaceae X Rubus ursinus Blackberry Rosaceae X X Galium aparine Goose grass Rubiaceae X * Citrus x limon Lemon Rutaceae X Salix lasiolepis Arroyo willow Salicaceae X * Tropaeolum majus Nasturtium Tropaeolaceae X SWCA Environmental Consultants BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Fozoonmehr Property—Partial List of Plants,June 24,2008 Po • Oa' l . • r • •t Re'ege a ed onna ive ra s lonal @AZINERIDED Co mon[thuigg PERIIV To on berry CSS. l t;t:i (o 1 [ j( Angiosperm—Monocotyledons Yucca * Yucca sp. (ornamental) Liliaceae X * Avena barbata Slender wild oat Poaceae X X X X * Bromus diandrus Ripgut brome Poaceae X X X X X _ • Bromus madritensis ssp. * rubens Red brome Poaceae X X X X X _ * Hordeum vulgare Barley Poaceae X X X X X Leymus • condensatus Giant wild rye Poaceae X X X X • Melica imperfecta Coast melic Poaceae X X X • Nassella pulchra Purple needlegrass Poaceae X X X CSS=Coastal sage scrub;*=Nonnative species;•=Suitable for revegetation • SWCA Environmental Consultants • • BIOLOGICAL RESOURCES ASSESSMENT FOZOONMEHR PROPERTY Wildlife Species Observed on and adjacent to the Project Area Reptiles Western fence lizard Sceloperus occidentalis San Diego Alligator Lizard Elgaria multicarinata webbii Birds Red-tailed hawk Buteo jamaicensis American kestrel Falco sparverius Mourning dove Zenaida macroura Anna's hummingbird Calypte anna Western scrub-jay Aphelocoma californica American crow Corvus brachyrhynchos Bushtit Psaltriparus minim us Bewick's wren Thryomanes bewickii Northern mockingbird Mimus polyglottos California towhee Pipilo crissalis Spotted towhee Pipilo maculatus White-crowned sparrow Zonotrichia leucophrys House finch Carpodacus mexicanus Lesser goldfinch Carduelis psaltria SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT Special-status Plants and Sensitive Habitats Ot e t=TLij,'l -o ent a Fo '1jfij E Rail',i•i () Per o• Ji4 31 Si cro-*a•`i a Occu ence Aphanisma blitoides Aphanisma None None 16.2 March- Coastal bluff scrub,coastal On bluffs and slopes near Not likely to occur:Though June dunes,coastal scrub. the ocean in sandy or clay there are 2 recent CNDDB soils. In steep decline on the records within 5 miles,there islands and the mainland.1- is no suitable habitat within 305 m elevation. the project area. Astragalus Ventura Marsh milk- FE SE 1B.1 June-Oct Coastal salt marshes. Within reach of high tide or Absent:There is no suitable pycnostachyus var. vetch Historically in coastal protected by barrier habitat within the project III lanosissimus southern California;Now beaches,more rarely near area and there are no known at one site in Ventura seeps on sandy bluffs.1-35 records within 5 miles. County. m elevation. Astragalus tener var. Coastal Dunes milk- FE SE 16.1 March- Coastal bluff scrub,coastal Moist,sandy depressions of Absent:There is no suitable titi vetch May dunes. Known only from a bluffs or dunes along and habitat within the project few extant occurrences; near the Pacific Ocean;one area and there are no mostly historical in southern site on a clay terrace.1-50 records within 5 miles. California. m elevation. Atriplex pacifica South Coast None None 16.2 Mar-Oct Coastal scrub,coastal bluff Alkali soils.1-500 m Not likely to occur:There saltscale scrub,playas,chenopod elevation. is marginally suitable habitat scrub. within the project area and 1 recent(1992)CNDDB record.However,this species was not identified during the survey. Atriplex parishii Parish's brittlescale None None 16.1 June-Oct Alkali meadows,vernal Usually on drying alkali flats Not likely to Occur: pools,chenopod scrub, with fine soils.4-140 m Though there is suitable playas. Plant collected only elevation. habitat within the project once since 1974(in 1993). area,there is only one historic record(date unknown)within 5 miles. Atriplex serenana Davidson's saltscale None None 1B.2 April-Oct Coastal bluff scrub,coastal Alkaline soils.3-250 m Not likely to Occur: var.davidsonii scrub. elevation. Though there is suitable • habitat within the project area,there is only one historic record(date unknown)within 5 miles. None None 3 March- Very sandy substrates near Absent:Though there are June the beach,typically on CNPS records in the beach bluffs. Inglewood,San Pedro,and Venice Quads,there is no Lewis'evening- suitable habitat within the Camissonia lewisii primrose project area. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT J @BB ow r :I•• " Po ent al Pot li 'tiD Commo Name alio eat@ (04;e 1•elr od Genera abi a M cro• a. tat Occ rrence Centromadia Southern tarplant FSC None 1B.1 May-Nov Marshes and swamps Often in disturbed sites near Absent:Though there are (=Hemizonia)parry! (margins),valley and foothill the coast.Also in alkaline two recent record(1997, ssp.australis grassland,vernal pools. soils,sometimes with 2001)within 5 miles,there is From southern California saltgrass.Also vernal pools. no suitable habitat within the and Baja California. 0-425 m elevation. project area. Chaenactis Orcutt's pincushion None None 1 B.1 Jan-Aug Coastal bluff scrub,coastal Sandy sites.3-100 m Absent:There is no suitable glabriuscula var. dunes. elevation. habitat within the project orcuttiana area and there are no records within 5 miles. Chorizanthe panyi San Fernando Valley FC SE 1B.1 April- Coastal scrub.Formerly Sandy soils.1,000-1,700 m Absent:Though there is • var.femandina spineflower June known from southern elevation. suitable habitat within the California;currently known project area,there are no only from single site at records within 5 miles. Ahmanson Ranch in Thousand Oaks. Cordylanthus Salt marsh bird's- FE SE 16.2 May-Oct Coastal salt marsh,coastal Limited to the higher zones Absent:There is no suitable maritimus ssp. beak dunes, of the salt marsh habitat.0- habitat within the project maritimus 30 m elevation. area and there are no records within 5 miles. Crossosoma Catalina crossosoma None None 1 B.2 Feb-May Chaparral and coastal scrub Rocky sea bluffs;elevation Absent:Though there are califomicum range 0-500 m. two recent record (1991,1996)within 5 miles, there is no suitable habitat within the project area. Dithyrea maritima Beach spectaclepod FSC ST 1B.1 March- Coastal dunes,coastal Seashores,on sand dunes, Absent:There is no suitable May scrub.Formerly more and sandy places near the habitat within the project widespread in coastal shore.3-50 m elevation. area and there are no habitat in southern records within 5 miles. California. Dudleya vireos ssp. Island green dudleya None None 1 B.2 Apr-June Coastal bluff scrub and Rocky soils;Elevation range Absent:Though there are insularis Coastal scrub. 5-300 m. two recent record • (1990,1992)within 5 miles, there is no suitable habitat within the project area. Hordeum intercedens Vernal barley None None 3.2 March- Grasslands or vernal pool Saline flats and depressions. Absent:Though there is a June basins. record(CNPS-Venice Quad)within 5 miles,there is no suitable habitat within the project area. Lasthenia glabrata Coulter's goldfields FSC None 1B.1 Feb- Coastal salt marshes, Usually found on alkaline Absent:There is no suitable ssp.cou!teri June playas,valley and foothill soils in playas,sinks,and habitat within the project grasslands,vernal pools. grasslands.1-1,400 m area and there are no elevation. records within 5 miles. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT krt.= alp ,• B oom Po en at or RitaMADRID op ungam t>TT- Eatl..ars ( ) RTirirq (RazialeagIa tcro-r a`.1ta Occ i rrence. Lycium brevipes var. Santa Catalina None None 1 B.1 June Coastal bluff scrub,Coastal Elevation range 10-300 m; Not likely to occur:Though hassei Island desert thorn scrub. presumed extirpated from there is 1 recent(1992) islands. record within 5 miles,there is marginal habitat for this species and it was not observed during the survey. Navarretia fossalis Spreading navarretia FT None 1B.1 April— Vernal pools,chenopod San Diego Hardpan and San Absent:There is no suitable June scrub,marshes and Diego Claypan vernal pools. habitat within the project swamps,playas. In In swales and vernal pools, area and there are no California,known only from often surrounded by other records within five miles. Riverside and San Diego habitat types.30-1,300 m IP Counties. elevation. Nemacaulis Coast woolly-heads None None 1 B.2 April—Sep Coastal dunes. Elevation range 0-100 m. Absent:Though there is one denudata var. historic(1905)record of this denudata species within 5 miles,there is no suitable habitat within the project area. Orcuttia califomica California orcutt FE SE 16.1 April—Aug Vernal pools.Known only 15-660 m elevation. Absent:There is no suitable grass from southern California and habitat within the project Baja. area and there are no records within 5 miles. Pentachaeta lyonii Lyon's pentachaeta FE SE 16.1 March— Chaparral,valley and foothill Rocky to clay soils.30-630 Absent:Though there are Aug grassland;Edges of m elevation.blooming period historic(1910,1889)records clearings in chaparral, Mar—Aug.Historical of this species within 5 usually at the ecotone collection of single plant from miles,there is no suitable between grassland and SCT Isl.was likely habitat within the project chaparral or edges of introduced. area. firebreaks. Phacelia stellaris Brand's star phacelia None None 1B.1 March— Coastal scrub,coastal Open areas.5-1,515 m Absent:Though there is June dunes.Southern California elevation. one historic(1909)record of and Baja. this species within 5 miles, there is no suitable habitat • within the project area. Potentilla multijuga Ballona cinquefoil FSC None 1A June— Meadows and seeps. Brackish meadows.0-2 m Absent:There is no suitable Aug Endemic to Los Angeles elevation. habitat within the project County;apparently extinct. area and there are no records within 5 miles. Suaeda estenoa Estuary seablite None None 1 B.2 May—Oct Marshes and swamps. Coastal salt marshes in clay, Absent:Though there is silt,and sand substrates.0— one historic(1904)record of 5 m elevation. this species within 5 miles, there is no suitable habitat within the project area. SWCA Environmental Consultants L FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT ffafaa 3 Lei "i B •• Po ent al'For miairiewaiD Co •n Ilk,1ta aEftrp, olttri au-Q.) Per od Genera abrtat ifir4ttrtMED Occurrence Symphyotrichum San Bernardino aster None None 1B.2 July—Nov Cismontane woodland, In vernally mesic soils near Absent:Though there is defoliatum Coastal scrub,Lower ditches,streams,springs, marginally suitable habitat montane coniferous forest, 165-1,000 m elevation. within the project area,there Meadows and seeps, Blooms April—May. are no records within 5 Marshes and swamps, miles. Valley and foothill grassland. Habitats Southern Coastal None None CNDDB Ocean-influenced moisture- Plants up to 2 m tall.Most Absent:Not identified within Bluff Scrub laden winds.Intergrades in plants woody and/or the project area. less exposed settings with succulent,flowering from late • Venturan Coastal Sage winter through spring. Scrub,or on finer-grained soils with Valley and Foothill Grassland.Localized sites along the coast,south of Pt. Conception and on the off- shore islands. Southern Coastal None None CNDDB Bays,lagoons,and Species include Atrip/ex Absent:Not identified within Salt Marsh estuaries along the coast watsonii,Balls maritima, the project area. from about Point Conception Lycium califomicum, to the Mexican border. Monanthochloe littoralis, Considerably reduced by Suaeda califomica,and land development activities. Salicomia subterminalis. Southern Dune Scrub None None CNDDB Sand verbena-beach Adapted to continuously Absent:Not identified within bursage series in Sawyer moving sand and extreme the project area. and Keeler-Wolf(1995). aridity.Transitions into coastal sage scrub. Federal State Other CNPS FT=Federal Threatened CE=California listed as FSS=Forest Service List 1 B=Plants rare or endangered in California and elsewhere FE=Federal Endangered Endangered Sensitive 9 List 2=Rare,threatened,or endangered in California,but more common FPT=Federal Proposed CT=California listed as BLMS=Bureau of Land elsewhere. • Threatened Threatened Management Sensitive List 3=We need more information about this plant(Review List). FPE=Federal Proposed CR=California Rare Species CDFS=California Dept.of 0.1=Seriously endangered in California(more than 80%of occurrences Endangered SC=California Species of Forestry Sensitive threatened/high degree and immediacy of threat) FPD=Federal Proposed Delisting Special Concern CNDDB=CA Natural 0.2=Fairly endangered in California(20%-80%occurrences threatened) FP=Califomia FullyDiversity Database FC=Federal Candidate protected (maintained by CDFG) 0.3=Not very endangered in California(<20%of occurrences threatened) FD=Federal Delisted CA-Endemic=Plant's native range is confined to California SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT Special-status Wildlife (kfillitL.tll I CSFiIg '(h a Iiii Wjli17 WttM GMT R4110.) i. M cro•Hab a •:o ent al o Occurrence Invertebrates Brennania belkini Belkin's dune None SC Inhabits coastal sand dunes of Absent:There is no suitable habitat tabanid fly Southern California. within the project area and there are no records within 5 miles. _ Caro/ella busckana Busck's gall moth None SC Unknown. Unknown. Unknown. Cicindela hirticolis Sandy beach tiger None None Inhabits areas adjacent to non- Clean,dry,light-colored Absent:Though there are 2 historic 10 gravida beetle brackish water along the coast of sand in the upper zone. (1979)records within 5 miles,there is no California from San Francisco Bay Subterranean larvae prefer suitable habitat within the project area. to northern Mexico. moist sand not affected by wave action. Cicindela latesignata Western beach None None Mudflats and beaches in coastal Absent:There is no suitable habitat latesignata tiger beetle Southern California. within the project area and there are no records within 5 miles. Cicindela sensilis Frost's tiger None None Inhabits the marine shoreline from Inhabits dark-colored mud in Absent:There is no suitable habitat frosti beetle the central California coast south to the lower zone and dried salt within the project area and there are no the salt marshes of San Diego. pans in the upper zone records within 5 miles. Coe/us globosus Globose dune None SC Inhabitant of coastal sand dune Absent:There is no suitable habitat beetle habitat,from Bodega Head in within the project area and there are no Sonoma County south to Ensenada, records within 5 miles. Mexico. Danaus plexippus Monarch butterfly None None (Wintering Sites)Winter roost sites Roosts located in wind- Not likely to occur:Though there are extend along the coast from protected tree groves two recent records(1989,1998)within northern Mendocino to Baja (Eucalyptus,Monterey Pine, 10 miles,there is marginal habitat California,Mexico. Cypress),with nectar and adjacent to the project area(roosting water sources nearby. trees). Eucosma hennei Henne's None None Endemic to the El Segundo dunes Absent:There is no suitable habitat • eucosman moth (type locality),Los Angeles County. within the project area and there are no records within 10 miles. Euphilotes batto/des El Segundo blue FE None Restricted to remnant coastal dune Host plant is Eriogonum Absent:Though there are two recent allyni butterfly habitat in Southern California. parvifolium;larvae feed only records within ten miles,there is no on the flowers and seeds; suitable coastal dune habitat within the used by adults as major project area. nectar source. Glaucopsyche Palos Verdes FE None Restricted to the cool,fog-shrouded, Host plant is Astragalus Absent:Though there are several recent lygdamus blue butterfly seaward side of Palos Verdes Hills, trichopodus var.lonchus records within 10 miles of the project palosverdesensis Los Angeles County. (locoweed). area,there is no suitable habitat within the project area. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT iT Olt* -2att M c o-lia.1 a Po en is .fo Occur a ce Onychobaris langei Lange's El None None Known from El Segundo dunes. Presumed extinct. Absent:There is no suitable habitat Segundo dune within the project area and there are no weevil records within 5 miles. Panoquina errans Wandering None None Southern California coastal salt Requires moist saltgrass for Absent:There is no suitable habitat (=saltmarsh) marshes. larval development. within the project area and there are no skipper records within 10 miles. Rhaphiomidas El Segundo None None Known from El Segundo dunes. Presumed extinct. Absent:Though there is 1 recent(2001) terminatus flower-loving fly record within 5 miles,there is no suitable terminatus habitat within the project area. ill Trigonoscuta Dorothy's El None None Coastal sand dunes in Los Angeles Absent:There is no suitable habitat dorothea dorothea Segundo Dune County. within the project area and there are no weevil records within five miles. Tryonia imitator Mimic tryonia None None Inhabits coastal lagoons,estuaries Found only in permanently Absent:Though there is 1 historic(date (California and salt marshes,from Sonoma submerged areas in a variety unknown)record within 5 miles,there is brackishwater County south to San Diego County. of sediment types;able to no suitable habitat within the project snail) withstand a wide range of area. salinities. Fish Gila bicolor Mohave tui chub FE SE Endemic to the Mohave River basin, Needs deep pools,ponds or Absent:Though there is one historic mohavensis adapted to alkaline,mineralized slough-like areas.Needs record(1976)of this species within 5 waters. vegetation for spawning. miles,there is no suitable habitat within the project area. Reptiles and Amphibians Actinemys Southwestern None SC Inhabits permanent or nearly Require basking sites such Absent:There is no suitable habitat marmorata pallida pond turtle permanent bodies of water in many as partially submerged logs, within the project area and there are no habitat types below 6000 ft. vegetation mats,or open records within 5 miles. mud banks. Phrynosoma Coast homed None SC FSS Inhabits coastal sage scrub and Prefers friable,rocky or Absent:Though there is marginal Ill coronatum lizard chaparral in arid and semi-arid shallow sandy soil. habitat within the project area,there are climate conditions. no records within 5 miles. Birds Agelaius tricolor Tricolored None SC BLMS Highly colonial species,most Requires open water, Absent:Though there are recent blackbird numerous in the Central Valley and protective nesting substrate records(1980s)within 10 miles,there is vicinity. Largely endemic to and foraging area with insect no suitable nesting habitat within the California. prey within a few km of the project area. colony. Athene cunicularia Burrowing owl None SC BLMS Open,dry annual or perennial Subterranean nester, Absent:There is no suitable habitat grasslands,deserts and scrublands dependent upon burrowing within the project area and there are no characterized by low-growing mammals,especially records within 10 miles. vegetation. California ground squirrel. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT Common Federal State Scientific Name Name Status Status Other General Habitat Micro-Habitat Potential for Occurrence Charadrius Western snowy FT SC Sand beaches on marine and Requires sandy,gravelly or Absent:There is no suitable habitat alexandrinus plover(coastal estuarine shores,also salt pond friable soil substrates for within the project area and there are no nivosus population)(N) levees and the shores of large alkali nesting. records within 10 miles. lakes. Empidonax traillii Southwestern FE SE Riparian woodlands in southern Breeds principally in(at low Absent:There is no suitable habitat extimus willow flycatcher California. elevations)dense willow, within the project area and there are no cottonwood,and tamarisk records within 10 miles. thickets and woodland along streams and rivers. Laterallus California black None ST Mainly inhabits salt-marshes State listing includes all Absent:There is no suitable habitat • jamaicensis rail bordering larger bays. subspecies. within the project area and there are no coturniculus records within 10 miles. Passerculus Belding's None SE IUCN:LC, Coastal salt marshes,from Santa Nests in Salcornia on and Absent:There is no suitable habitat sandwichensis savannah FSS,BCC Barbara,south to San Diego about margins of tidal flats. within the project area and there are no beldingi sparrow County. records within 10 miles. Pelecanus California brown FE SE,FP Coastal salt water,beaches,bays, Feeds on saltwater fishes Absent:Though there is one recent occidentalis pelican marshes and on the open ocean. such as anchovy. record within 10 miles(2000),there is no californicus suitable habitat within the project area. Polioptila californica Coastal California FT SC Obligate permanent resident of Low,coastal sage scrub in Absent:Though there are recent californica gnatcatcher coastal sage scrub below 2,500 ft in arid washes,on mesas and records within 10 miles of the project southern California. slopes.Prefers stands area,the coastal scrub habitat is dominated by Artemisia severely fragmented and dominated by californica. sugarbush,and therefore does not provide appropriate nesting habitat. Sternula antillarum California least FE SE,FP Nests along coast from San California breeder on bare, Absent:Though there is one historic browni tern(N) Francisco Bay south to northern or sparsely vegetated,flat (1977)record within 5 miles and 2 recent Baja California. substrates: sand beaches, (1987 and 1996)records within 10 miles, alkali flats,landfills,or paved there is no suitable habitat within the areas. project area. Mammals ill Eumops perotis California mastiff None SC BLMS Many open,semi-arid to arid Roosts in crevices in cliff Not likely to occur:Though there is one califomicus bat habitats,including conifer and faces,high buildings,trees historic record(1929)within 10 miles, deciduous woodlands,coastal and tunnels. there is marginally suitable habitat within scrub,grasslands,chaparral,etc. the project area. Lasionycteris Silver-haired bat None None Primarily coastal and montane Roosts in hollow trees, Not likely to occur:Though there is one noctivagans forest dweller feeding over streams, snags,buildings,rock historic record(1986)within 10 miles, ponds and brushy areas.During crevices,caves,and under there is marginally suitable roosting spring and fall migrations the silver- bark. habitat within the project area. haired bat may be found anywhere in California. SWCA Environmental Consultants FOZOONMEHR PROPERTY BIOLOGICAL RESOURCES ASSESSMENT 'uLit11)Earaillif.MM i- C`.►t.L RrttrO >m Othe rilatatilean M c o-rabi a Poten a: o Occ rrence Microtus califomicus South coast None SC Meadows.Fresh vegetation Construct surface runways Absent:There is no suitable habitat stephensi marsh vole clippings and fecal pellets are and extensive underground within the project area and there are no indicators of the Voles'presence. burrows,and are active records within 10 miles. throughout the year,chiefly at dawn and dusk. Neotoma lepida San Diego desert None SC IUCN:DD Coastal scrub of southern California Prefers moderate to dense Not likely to occur:Though there is one intermedia woodrat from San Diego County to San Luis canopies;abundant in rock recent record(1991)within 5 miles,there Obispo County. outcrops and rocky cliffs and is marginally suitable habitat within the slopes. project area and it is highly disturbed. III Nyctinomops Pocketed free- None SC IUCN:LC, Arid regions including pine juniper Rocky areas with high cliffs. Absent:There are no records within 10 femorosaccus tailed bat WBWG:M woodlands,desert scrub,palm miles and there is no suitable habitat oasis,desert wash,and desert within the project area. riparian habitats. Nyctinomops Big free-tailed bat None SC Lives in rocky areas of desert scrub Roosts by day in crevices on Absent:Though there is one historic macrons or coniferous forests. cliff faces record(1983)within ten miles,there is no suitable habitat within the project area. Perognathus Pacific pocket FE None Narrow coastal plains(Mex.To El Alluvial sands near ocean Absent:Though there is one historic longimembris mouse Segundo) record(1931)within 10 miles,there is no pacificus suitable habitat within the project area. Sorex omatus Southern None SC Confined to the coastal marshes in Dense ground cover,nesting Absent:There is no suitable habitat salicomicus California Los Angeles,Orange,and Ventura sites above mean high tide within the project area and there are no saltmarsh shrew counties. and free from inundation. records within 5 miles. Taxidea taxus American badger None SC Most abundant in drier open stages Need sufficient food,friable Absent:There is no suitable habitat of shrub,forest,and herbaceous soils,and uncultivated within the project area and there are no habitats,with friable soils. ground.Prey on burrowing records within 5 miles. rodents.Dig burrows. FT=Federal Threatened SE=California listed as Endangered WBWG=Western Bat Working Group FE=Federal Endangered ST=California listed as Threatened H=High Priority FPT=Federal Proposed Threatened SR=California Rare Species MH=Medium-High PriorityIII FPE=Federal Proposed Endangered SC=California Species of Special M=Medium Priority FPD=Federal Proposed Delisting Concern LM=Low-Medium Priority FC=Federal Candidate FP=California Fully Protected Species USBC=The United States Bird Conservation Watch List FD=Federal Delisted WL=California Watch List ABC=The American Bird Conservancy Green List Audubon=WatchList BCC=U.S.Fish and Wildlife Service Birds of Conservation Concern SWCA Environmental Consultants I • • DR. SHAHRAM FOZOONMEHR 28701 HIGHRIDGE ROAD ROLLING HILLS ESTATE, CALIFORNIA 90274 ADDENDUM No. 2 TO PRELIMINARY GEOTECHNICAL ENGINEERING AND • ENGINEERING GEOLOGY INVESTIGATION FOR 3 APPALOOSA LANE ROLLING HILLS Response to Review Letters Dated 10/11/06 and 10/26/06 Prepared By SASSAN Geosciences, Inc. 1290 North Lake Avenue, Suite 204 Pasadena, California 91104-2869 October 9, 2007 i • SAS SASSAN Geosciences,Inc. October 9, 2007 Dr. Shahram Fozoonmehr 28701 Highridge Road Rolling Hills Estate, CA 90274 Subject: Addendum No. 2 to Preliminary Geotechnical Engineering and Engineering Geology Investigation (Response to Review Letters Dated 10/11/06 and 10/26/06) 3 Appaloosa Lane, Rolling Hills SAS File Number: 5F0Z091 Current Reference Report/ Document Prepared by Report/Letter Log No. Date Preliminary Soils & Geo 5F0Z091 03-16-06 SASSAN Geosciences, Inc. Geologic Review Sheet 0403180001 04-17-06 County of Los Angeles Soils Eng. Review Sheet 0403180001 04-20-06 County of Los Angeles Addndm 1 Soils & Geo 5F0Z091 08-30-06 SASSAN Geosciences, Inc. Geologic Review Sheet 0403180001 10-11-06 County of Los Angeles Soils Eng. Review Sheet 0403180001 10-26-06 County of Los Angeles Dear Mr. Fozoonmehr: SASSAN Geosciences, Inc. (SAS) has prepared this addendum to our preliminary geotechnical engineering and engineering geology investigation for the proposed development to respond to the questions raised by the County in their Geologic Review 1290 North Lake Avenue.Suite 204.Pasadena.California 91104-2869 . (626)345-1819 . Fax(626)345-1820 . sasgeoinc@aol.coni • • Sheet dated 10/11/06 and Soils Engineering Review Sheet dated 10/26/06. A copy of the Review Sheets is presented in Attachment No. 1. The questions are responded to in the order raised. Introduction The following responses to the Geologic and Soil Engineering Review Sheets will incorporate several items that have come up since submittal of the last addendum report dated August 30, 2006, prepared by this office. These items are as follows: • The development/grading plan has been changed. The stable/barn and access road to the barn have been eliminated from the plan and shown only as "future" stable. This change was discussed at an earlier meeting with county personnel and is significant in that it reduces the area requiring remedial grading/stabilization in the northern portion of the site. • The owner has requested that the landslide mass and proposed improvements be stabilized utilizing earth buttresses/shear keys rather than rows of soldier piles. The previously recommended soldier piles have therefore been removed from the geotechnical plan/ cross sections. The recommended shear keys/buttresses are shown on the geotechnical plan and cross sections, as well as the grading plan. • During the discovery phase of a lawsuit involving the subject property, a previous, relatively complete geotechnical report by Converse Ward Davis Dixon prepared in December, 1980 for a development scheme involving splitting the property into three parcels, was provided to our office. Data from this report, which was SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 2 of 23 • previously unknown to us, has been incorporated in the Geotechnical Map, Cross- Sections, and our overall interpretation of the site soil and geologic conditions. A copy of the Converse report is provided with this submittal in Enclosures. • Additional field exploration has been conducted in part to aide in responding to previous review comments, and in part to clarify data from the Converse report. Specifically, the depth and extent of the upper portion of the landslide mass that extends westerly into the properties adjacent to Buggy Whip Drive, was explored with additional test pits T-1 through T-10. Data from this exploration has been utilized to modify the subsurface geometry of the upper landslide area and to clarify the western margin of the landslide. Copies of the trench logs are included in Attachment No. 3. And in order to define and calculate the settlement of the proposed structure, bore holes B-9 through B-11 were drilled. Copies of these bore hole logs along with copies of the logs for B-1 through B-8 are presented in Attachment No. 4. • Permission has been obtained from the owners of the properties to the west at 17 and 19 Buggy Whip Drive to encroach into their properties during the grading operation to stabilize the upper portion of the landslide. Accordingly, the stabilization fill that replaces the existing slide mass encroaches into those properties. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 3 of 23 i Discussion The following issues are addressed in this report that have not been addressed before: Lateral Support System - During our meeting with the Department a decision was made to change the lateral support of the slide mass from rows of soldier piles to a buttress system. This report closely analyzes this approach. Settlement Calculation - During the same meeting a decision was made to change the support of the proposed residence from friction piles to a combined continuous and spread footing system. This report provides recommendations for the proposed foundation system and analyzes the anticipated settlements. This information is provided in Foundation Recommendations section of this report. Expansive Soils - The earth materials supporting the residence will consist of a minimum of ten-foot-thick layer of engineered fill. This fill will largely be composed of native earth materials that are highly expansive. As such, all recommendations presented in this report consider the very high expansive index of the native earth materials. Strength Parameters -The required strength parameters for the earth materials used in the buttress/engineered fill are C = 1,600 psf and $= 33 degrees. Multiple laboratory tests were performed on the site earth materials that resulted in low strength parameters. As such, a campaign of testing soil-cement mix was initiated. The mix of the native earth materials with cement ranging from three (3) percent to ten (10) percent of the weight did not furnish the desired strength parameters. Finally a new mix of sixty-five (65) percent native earth materials with twenty-five (25) percent sand and ten (10) percent cement resulted in the above strength parameters. Copies of the laboratory direct shear test results are presented in Attachment No. 8 of this report. The contractor may use any other mix provided that it can provide the above minimum strength parameters. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 4 of 23 • 41, Geologic Review Sheet Q 1 - As stated on the geologic review sheet dated 4/17/06: Required plans were not submitted. Two sets of plans must be submitted in order to complete the review. (Please note: an update geotechnical/geologic map, utilizing the most recent proposed grading plan, must be provided when the final grading plan is developed). Al - A copy of the most recent grading plan, prepared by Bolton Engineering has been utilized as the base map for the attached Geotechnical Map, Figure A-2 in Attachment No. 2. It should be noted that some major aspects of the grading plan/development have been changed. In particular, the stable and the associated connecting road have been eliminated from the plan, necessitating other changes to the northwesterly slope that descends from the proposed residence. Q2 - The consultant must provide subsurface data to verify the western and southern limits of the landslide considering that the current consultant has rejected EGL's subsurface investigation, with the exception of borings B-7 and B-9, as well as their interpretations. A2 - Additional subsurface exploration has been conducted to verify the western and southern margins of the landslide. Test pits T-1 and T-2 were excavated approximately midslope, in the central portion of the landslide. Ground control was measured from a survey point on a roadway near the test pits. The landslide SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 5 of 23 • • margin was found in Test Pit T-1, as shown on the test pit log, Geotechnical Map, and Cross-Section H-H' (Test Pit T-2 also verified the landslide rupture surface north of the exposure in T-1). It should be noted that the locations of B-8, P-1 and P-2 were shifted northward from the locations shown previously, based on new measurements/ground control from the survey point found at the site. Test pits T-3 and T-4 were excavated near the toe of the south margin of the landslide. The landslide was found in T-4, as indicated on the log and on the Geotechnical Map. T-3 was outside the limits of the landslide. Although technically the test pits did not expose the actual slide margin, the test pits were only 20 feet apart, and the slide margin is shown passing between the test pits on the enclosed Geotechnical Map, Figure A-2 in Attachment No. 2. In order to clarify the western limits of the landslide, test pits T-2 and T-3 by EGL, and TP-7 and boring BH-7 by Converse, all of which were within the landslide mass, have been added to the Geotechnical Map. In addition, new test pits T-5 through T-10 were excavated on the equestrian trail along the western property line. Copies of the test pit logs including the diagrammatic illustration of them are presented on Figures 3-1 through 3-10 in Attachment No. 3 of this report. As a result of the exploration, the depth of the landslide as it extends offsite has been modified, and the western limit of the on-site landslide has been adjusted to coincide with data from the test pits, although the changes are not substantial. The results are shown on the geotechnical plan, and cross sections. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 6 of 23 111 • Q3 - Data presented for the site indicates rotational failure of the landslide, however, block slides are illustrated, showing a failure surface along a planar discontinuity with corresponding analysis. Either provide additional justification for the configuration for a planar slide or revise the sections to illustrate a configuration consistent with rotational failure. Provide revised stability analysis for the revised sections. (For definition, refer to Page 338, Figure 13-1, in Landslides: Investigation and Mitigation, Special Report 247, Turner and Schuster, eds., 1996). A3 - We agree that the landslide is a rotational failure and have redrawn the cross sections accordingly. Our stability analysis reflects the changed landslide geometry. Copies of the modified cross-sections are presented on Figures A-3 through A-7 in Attachment No. 2 of this report. Q4 - The intent of prior remark #7 was to have several cross-sections through the steepest areas of the natural ascending slope to determine any additional surcharge onto the proposed piles. Cross-section F-F'partially addresses this concern but may not represent the highest surcharge the piles may experience due to the steep ascending slope. Therefore,please provide more cross-sections, roughly in this orientation, covering the area of the proposed piles, and provide stability analyses to determine the surcharge. A4 - Cross-Sections G-G' and I-I' have been added to address other portions of the westerly ascending slope above the property. As indicated in cross section G-G' as compared to Cross-Section F-F', the slope areas represented in the sections are at a similar inclination, however the total slope height in section F-F' is higher and is above the proposed residence where site grades will be lowered. It is therefore our opinion that Cross-Section F-F' is the most critical SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 7 of 23 • Q5 - Provide the logs of P-1 and P-2. Information that must be included, as for all subsurface logs, are the date drilled, the method of drilling, and the person or persons that logged the excavation. Please also include this information on the logs for borings B-1 through B-8. A5 - The borings for P-1 and P-2 were not downhole logged by the geologist, Thomas G. Hill, who was present during the drilling process. The borings were drilled in a cut area where bedrock was exposed at the surface, so the entire boring was in bedrock of the Monterey Formation similar to that logged in boring B-8, immediately adjacent to P-1 and P-2. The requested information, indicating the date of drilling, geologist logging the boring, etc... has been added to borings B-1 through B-11. Copies of the boring logs are presented in Attachment No. 4. Q6 - The response to prior comment #10 cannot be evaluated until plans are received that depict the proposed location of the sewage disposal system. After the location has been determined and this information has been furnished to the geotechnical consultants the following will be required: Based on the recommended location, data on the possible adverse impact of the private sewage disposal system relative to site stability and adjacent properties must be provided. The consultant must discuss the path of migration of effluent and whether daylighting of the effluent will occur. Stability calculations must consider the effect on groundwater. Show on geologic cross section(s) the anticipated path and saturation from the effluent based on hydrogeology of the site. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 8 of 23 S A6 - Cross-Sections H-H' and X-X' have been drawn to evaluate the potential influence of effluent migration on the stability of the proposed improvements and landslides on the site, as well as the stability of the adjacent upslope properties. Please note that H-H' extends to the south portion of the property, in an area not proposed for development, where Converse has mapped a relatively shallow, surficial landslide. Cross-Sections H-H' and X-X' are presented on Figures A-6 and A-7 in Attachment No. 2. Deep-seated static and pseudo-static slope stability analyses were performed for section X-X' considering the path of migration of effluent. The results of the stability analyses for section X-X' are presented in Attachment No. 7. Based on the slope stability analyses and our analyses of the path of effluent migration, as depicted on Cross-Sections H-H' and X-X', the sewage disposal system, in the location proposed, will not have an adverse effect on the stability of the subject site and adjacent properties. Q7 - All recommendations of the consulting geologist and soils engineer must be incorporated into the design or shown as notes on the plans. A7 - Acknowledged. The civil engineer-of-record has been advised regarding this request. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 9 of 23 • • Q8 - The plan must be specifically approved by the consultant geologist and soils engineer by manual, original signatures and dates on each sheet prior to approval by the Geology Section. Submit two (2) sets for review. A8 - Acknowledged. The civil engineer-of-record has been advised to provide two (2) sets of plans for approval by the consulting geologist and soils engineer. Q9 - Add the following as notes to the plan: In-grading inspections must be made by the consulting geologist and soils engineer. Monthly in-grading inspection reports must be submitted directly to the Geology and Soils Section by the consultants. Rough grading must be approved by a final engineering geology and soils engineering report. An As-Built Geologic Map must be included in the final geology report. Provide a final report statement that verifies work was done in accordance with report recommendations and code provisions (Section 3318.1). The final report(s) must be submitted to the Geotechnical and Materials Engineering Division for review and approval. Foundation excavations must be inspected and approved by the consulting geologist and soils engineer prior to the placing of steel or concrete. A9 - Acknowledged. The civil engineer-of-record has been advised to show the required notes on the grading plans. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 10 of 23 • Q10 - Show all proposed corrective measures (piles, deep removals, etc.) on the plan. A10 - Acknowledged. The proposed corrective measures are included on the plan. Q 11 - The Soils Engineering review dated 10/26/06 Is attached. Al 1 - Acknowledged. Copies of the Review Sheets are presented in Attachment No. 1. Soils Engineering Review Sheet Q1 - Requirements of the Geology Section are attached. Additional slope stability analysis and back calculation to determine the shear strength parameters of the slide plane materials may be required when the geology of the site (limits and depth of landslide, etc.) is conclusively determined. Al - Additional back-calculation analyses are performed on the revised cross-section C- C' to determine the shear strength parameters of the slide plane materials. A series of back-calculation analyses were performed, using the very conservative existing topography at a dry condition (no groundwater at the moment of failure). The plan line of the cross-section is presented on Figure A-2 in Attachment No. 2. Section C-C', used in back-calculation analyses, is presented on Figure 5-1 in Attachment No. 5. The following sets of strength parameters were obtained from our back-calculation effort: SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 11 of 23 • • Back-Calculations Section C-C' (i) F.S. (degrees) (psf) 10 349 1.000 11 266 1.000 12 182 1.000 13 97 1.000 A copy of a set of back-calculation analysis for cross-section C-C' is presented in Attachment No. 5. Additional deep-seated stability analyses are performed on the revised cross- sections A-A', B-B', C-C', F-F', G-G', and new cross-section I-I' to determine the factor of safety of the slope after implementation of the proposed buttress. The strength parameters for the earth materials of the proposed buttress are considered as C=1,600 psf and 4)=33 degrees. Copies of deep-seated stability analyses for all cross-sections are presented in Attachment No. 6. The stability of the slopes was analyzed using STABL5, a computer program developed by Purdue University to handle general slope stability problems by the Simplified Janbu and the Modified Bishop method of slices. A set of strength parameters was obtained from the laboratory direct shear test results, as well as, back-calculation analyses of the slide plane material. Slopes that will be affected by the proposed construction are selected for the analyses. The plan lines of these cross-sections are presented on Figure A-2 in Attachment SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 12 of 23 • • No. 2. All sections used in static and pseudo-static analyses are presented on Figures 6-1 through 6-6, and the surficial slope stability analyses are presented on Figures 6-7 through 6-13 in Attachment No. 6. Following table summarizes the strength parameters used in slope stability analyses: Strength Parameters Slide Slide Material Type Bedrock Buttress Plane Debris Internal Friction Angle 11 24 30 33 Cohesion (psf) 266 600 620 1,600 Total Unit Weight (pcf) 115 115 120 120 Saturated Unit Weight (pcf) 115 115 120 120 Series of deep-seated static, pseudo-static and surficial slope stability analyses for all sections resulted in minimum factors of safety that are reflected in the following table: Calculated Factors of Safety Cross-Section Static Pseudo-Static Surficial A-A' 1.837 1.158 1.71 B-B' 1.884 1.138 1.74 C-C' 1.972 1.205 2.29 F-F' 1.706 1.491 1.62 G-G' 2.090 1.475 1.63 I-I' 1.963 1.336 1.91 SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 13 of 23 • • The backup calculations for deep-seated and surficial stability analyses are presented in Attachment No. 6. Q2 - Independent analyses give higher active EFP's (or loads) than those recommended in the 8/30/06 report. Per County policy, the slope with the proposed mitigation must have a Factor of Safety of at least 1.5. (That is, the combine resistance from the soils and the soldier piles must be at 1.5 times the driving force due to the landslide mass). Verify and provide revised active EFP's (or loads) as necessary. Provide additional or revised analyses of the proposed soldier pile as necessary. A2 - Due to the fact that the entire design concept has changed from a soldier pile support system to a buttress/stabilization fill system the lateral design values are not relevant at this time. Q3 - Based on the recommended location of the proposed sewage system,provide data on the possible adverse impact of the private sewage disposal system(s) relative to site stability and adjacent properties. Discuss the path of migration of the effluent and whether ponding or daylighting of the effluent will occur. Stability calculations must consider the effect ofponding/perched groundwater. A3 - As mentioned on the original SAS report and Addendum No. 1 report "The proposed seepage pits will be located away from the proposed residence and away from the ancient landslide area. Three 2'-diameter boreholes; B-8, P-1, and P-2 were drilled and tested for percolation. The cone of influence that encompasses the boundary of the effluent does not reach the slide mass and does not interfere with the proposed improvements. The proposed private sewage disposal system SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 14 of 23 • s will not adversely affect the proposed improvements; neither will it affect the neighboring properties. " To demonstrate this graphically, two (2) cross-sections were prepared and presented in Attachment No. 7 of the Addendum No. 1 report. These cross-sections clearly demonstrate that the cone of influence of the effluent does not interfere with the improvements and they do not compromise the stability of the site. Additional cross-sections H-H' and X-X' have been drawn and are presented on Figures A-6 and A-7 in Attachment No. 2 of this report. Based on these cross- sections the path of migration of the effluent does not daylight and ponding of the effluent will not occur. The zone of influence of the effluent does not affect the areas that were analyzed for their stability. Deep-seated static and pseudo-static slope stability analyses were performed for section X-X' considering the path of migration of effluent. Series of deep-seated static slope stability analyses resulted in a minimum factor of safety of 1.692. Series of deep-seated pseudo-static slope stability analyses resulted in a minimum factor of safety of 1.250. The results of the stability analyses for section X-X' are presented in Attachment No. 7. Based on our slope stability analyses, the sewage disposal system, in the location proposed, will not have an adverse effect on the stability of the subject site and adjacent properties. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 15 of 23 • • Q4 - Show the following on the grading plans: a. Soldier pile plan and details (diameters, spacing, lengths, embedment depth, etc.). b. Approximate limits and depth of removal and recompaction of unsuitable soils under the proposed floor slab,per the soils engineer. c. Locations of dewatering wells,per the soils engineer. d. Location of subdrains as necessary. e. Location of private sewage disposal system(s). f. All recommended mitigation measures. A4 - The civil engineer-of-record has been advised to show the required information on the grading plans. Q5 - The Soils Engineer of record must review the grading plans and sign and stamp the plans in verification of his recommendations. Original manual signature and wet stamp are required. A5 - Upon presentation of the grading plans, the Soils Engineer of record will review the grading plans and sign and stamp the plans in verification of his recommendations. Q6 - Submit two sets of grading plans to the Soils Section for verification of compliance with County codes and policies. A6 - The owner and the consulting civil engineer of record are informed regarding this request. The plans will be submitted to the Soils Section for your verification. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 16 of 23 • • Q7 - Include a copy of this review sheet with your response. A7 - A copy of this Review Sheet is presented in Attachment No. 1. CONCLUSIONS AND RECOMMENDATIONS General The referenced property is considered to be suitable for the proposed construction from a geotechnical engineering and engineering geology standpoint against hazards such as landslides, settlement, and slippage, provided that our recommendations are incorporated into the approved construction plans. Further, the proposed status of the building or grading, as known, will not adversely affect the stability of adjacent properties. The referenced property is considered to be suitable for the proposed construction from a geotechnical engineering and engineering geology standpoint, provided that our recommendations are incorporated into the approved construction plans. The conclusions and recommendations presented here are based on our observations at the site during our investigation, engineering judgment, and analysis of the soil samples obtained from the boreholes and test pits. Minor variations of subsurface conditions are common, and major variations are possible. Foundation The proposed residence must be supported by continuous footings, spread footings, or a combination of both. Footings must be founded into the engineered fill with a minimum relative compaction of ninety(90) percent of its maximum dry density(ASTM 1557). SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 17 of 23 • • The native earth materials are considered to be highly expansive. The following recommendations are provided with that consideration. A bearing capacity of 2,000 psf must be used for footings twenty-four (24) inches wide and founded twenty-four (24) inches into the engineered fill. The allowable bearing capacity may be increased by twenty (20) percent for every additional foot of width or depth to a maximum value of 3,000 psf. The allowable bearing value is for dead-plus-live loads and may be increased by thirty (30) percent for momentary wind and seismic loads. The following minimums apply to all footings: 1. Footings must be founded at a depth of twenty-four (24) inches into engineered fill. 2. Footings must be reinforced with a minimum of four(4) #4 bars - two at the top and two at the bottom. The final design of the footings must be provided by a structural engineer in conjunction with this office. 3. A coefficient of friction of 0.25 must be utilized for resisting lateral loads at the contact surface of concrete and foundation soils. 4. Active earth pressure increasing at the rate of 35 psf per foot of depth must be used in calculations. 5. Passive earth pressure increasing at the rate of 250 psf per foot of depth, to a maximum of 2,500 psf, must be used in calculations. 6. All concrete elements of the substructure, which are in contact with the soil, must be constructed from concrete based on Cement Type V for highly corrosive soils. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 18 of 23 • Retaining walls must be provided with weep holes or perforated pipe and gravel sub-drain to prevent entrapment of water in the backfill. The perforated pipe must consist of four- inch (4") minimum diameter PVC Schedule 40, or ABS SDR-35, with a minimum of sixteen (16) perforations per foot on the bottom one-third of the pipe. Every foot of the pipe should be embedded in three (3) cubic feet of three-quarter-inch (3/4") gravel wrapped in filter fabric (Mirafi 140N or equal). Placement of gravel and filter fabric is also required for weep holes. The subdrain system behind the basement retaining walls will be located below the street level and will not drain via gravity. The subdrain water must be collected in a concrete catch basin and pumped to the street via sump-pumps. In addition, the retaining walls of the basement must be provided with extensive damp- proofing. The damp-proofing must be designed by a water proofing specialist. Engineered Fill The required strength parameters for the earth materials used in the buttress/engineered fill are C = 1,600 psf and = 33 degrees. During laboratory testing, a mix of sixty-five (65) percent native earth materials with twenty-five (25) percent sand and ten (10) percent cement resulted in the above strength parameters. The contractor may use any other mix provided that it can provide the above minimum strength parameters. All fill earth materials must consist of clean soil or the proper mix of native soils imported sand and cement that is free of vegetation and other debris. The fill must be placed in six- (6-) to eight- (8-) inch thick lifts at near optimum moisture content and compacted. The minimum required strength parameters must be furnished by the contractor and must be verified by laboratory testing. The contractor may use approved earth work technologies that would render equal or better pairs of strength parameters. SAS SASSAN Geosciences,Inc. 5FOZ091 October 9,2007 Page 19 of 23 • . Particles larger than three (3) inches in diameter must not be allowed in the backfill material. Earth materials must not be imported to the site without prior approval by the soil engineer. All engineered fill must be compacted to a minimum of ninety (90) percent of its maximum dry density(ASTM D 1557). Neither jetting nor water tamping are permitted. Settlement Based on consolidation test results and associated total settlement calculations the maximum total and differential settlements are expected to be less than one (1) and one- half(V2) inches, respectively, provided that our recommendations are followed. The consolidations test results are presented in Attachment No. 9 of this report and the associated settlement calculations are presented in Attachment No. 10 of this report. Due to high expansive index of the site earth materials the structural engineer-of-record is advised to use a one (1) inch differential settlement in the calculation of the structure of the residence. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 20 of 23 • • DESIGN REVIEW We suggest that the geotechnical and geological aspects of the project be reviewed by this firm during the design process. The scope of our services may include assistance to the design team by providing specific recommendations for special cases, reviewing the foundation design, reviewing the geotechnical and geological portions of the project for possible cost savings through alternative approaches, and evaluating the overall applicability of our recommendations. Additional site-specific explorations may also be considered if significant foundation modifications are required using the above recommendations. INSPECTION All excavations must be inspected and approved. All fill placed for engineering purposes must be tested for compaction and moisture content and certified. The subdrain system must be observed and approved. Inspection of excavations and subdrain system may also be required by the appropriate reviewing governmental agencies. It is recommended that SAS be retained to verify compliance with the recommendations made in this report, to ensure compliance with the design concepts, specifications, and recommendations, and to allow design changes in the event that exposed subsurface conditions differ from those anticipated herein. A joint meeting among the parties involved in this project is recommended prior to the start of groundbreaking to discuss specific procedures and scheduling. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 21 of 23 • • Inspections performed by SAS are for verification purposes only and shall under no circumstance relieve other parties involved in the design and construction from their obligation to perform work in accordance with the approved plans. In the event that the recommendations contained herein are interpreted by others, SAS will not accept responsibility for such interpretations. INVESTIGATION LIMITATIONS The conclusions and recommendations presented in this report are based on the findings and observations in the field and the results of laboratory tests performed on representative samples. The soils encountered in the boreholes and test pits are believed to be representative of the total area; however, soil characteristics can vary throughout the site. SAS should be notified if subsurface conditions are encountered which differ from those described in this report. This report has not been prepared for use by parties or projects other than those named and described above. It may not contain sufficient information for other parties or other purposes. The conclusions and recommendations presented in this report are professional opinions. These opinions have been derived in accordance with current standards of geotechnical engineering and engineering geology practice, field observations and laboratory test results. No other warranty is expressed or implied. Samples secured for this investigation will be retained in our laboratory for a period of thirty (30) days from the date of this report and will be disposed after this period unless other arrangements are made. SAS SASSAN Geosciences,Inc. 5F0Z091 October 9,2007 Page 22 of 23 0 • We appreciate the opportunity to be of service to you. If you have any questions, please call our office. Sincerely, SASSAN GEOSCIENC Q� sio .5_0S.D tt, GEo�o ��es° *A.SA(45,ee, 4 e 1" No.1100 ,.1' CONN CO m Exp.9-30-O8 w No.2579 F° m CERTIFIED cc Exp.6-30-09 p3 N ENGINEERING Q it ''' GEOLOGIST Q-• c 9 d>, ?EC HOC'0 �F OF c A`%FO 9rFOF CA�h�� Sassan A. Salehipour, G. Thomas G. Hill, C.E.G. President Engineering Geologist SAS/TH:ak/5foz09I g.doc Attachments SAS SASSAN Geosciences,Inc. 5F0Z09 1 October 9,2007 Page 23 of 23 i a List of References 1. Dibblee, T.W., Jr., 1999, Geologic Map of the Palos Verdes Peninsula and Vicinity, Dibblee Geological Foundation, Map DF-70, Scale 1:24,000 2. Cleveland, G.B., 1976, Geology of the Northeast Part of the Palos Verdes Hills, Los Angeles County, California, Map Sheet 27, Scale 1:12,000 3. Hu Associates, Inc., February 2, 2004, Preliminary Soil and Geology Investigation Report 4. Environmental Geotechnology Laboratory, Inc., January 19, 2004, Engineering Geologic Investigation, Proposed Single Family Residential Development, 3 Appaloosa Lane, Rolling Hills, California, EGL Project No. 03-137-01OG 5. County of Los Angeles, Geologic Review Sheet, April 22, 2004, Plan Check No. 0403180001 6. County of Los Angeles, May 11, 2004, Soils Engineering Review Sheet, Grading Plan Check No. 0403180001 7. County of Los Angeles, Geologic Review Sheet, April 21, 2005, Plan Check No. 0403180001 8. County of Los Angeles, Soils Engineering Review Sheet, May 12, 2005, Plan Check No. 0403180001 9. Environmental Geotechnology Laboratory, Inc., February 14, 2005, Response to County of Los Angeles Department of Public Works, Geotechnical and Materials Engineering Division, Geotechnical Review Sheet, Grading Plan Check No. • 0 0403180001, 3 Appaloosa Lane, Rolling Hills, California, EGL Project No. 03-137- 010GR 10.Hu Associates, Inc., February 28, 2005, response to County of Los Angeles Geologic and Soils Engineering Review Sheets, Proposed Single Family Residence, 3 Appaloosa Lane, Rolling Hills, California, Project No. HA-4830-2 11.Converse Ward Davis Dixon, December 23, 1980, Geotechnical Investigation, Tentative Tract No. 31836, Rolling Hills, California, Project No. 80-2238-01 12.County of Los Angeles, Geologic Review Sheet, October 11, 2006, Plan Check No. 0403180001 13.County of Los Angeles, Soils Engineering Review Sheet, October 26, 2006, Plan Check No. 0403180001 • • List of Attachments Attachment No. 1 Geologic Review Sheet dated 10/11/06 and Soils Engineering Review Sheet dated 10/26/06 Attachment No. 2 Maps and Cross-Sections: Figure A-2 Geologic Map (Site Plan), Figure A-3 Geologic Sections A-A and B-B, Figure A-4 Geologic Sections C-C and D-D, Figure A-5 Geologic Sections E-E and F-F, Figure A-6 Geologic Sections G-G and H-H, Figure A-7 Geologic Sections I-I and X-X, Attachment No. 3 Logs of Trenches and Test Pits T-1 through T-10, Figures 3-1 through 3-10, Attachment No. 4 Logs of Bore Holes B-9 through B-11, Figures B-1 through B-11, Attachment No. 5 Back-Calculation Analyses on Section C-C, Attachment No. 6 Slope Stability Analyses and Surficial Slope Stability Analyses, Attachment No. 7 Slope Stability Analyses for Section X-X (Seepage Pit Area), Attachment No. 8 Direct Shear Test Results on Soil/Cement Mixes, Figures 8-1 through 8-8, Attachment No. 9 Consolidation Test Results, Figures 9-1 through 9-11, Attachment No. 10 Consolidation Settlement Analysis, Figure 10-1. Dist.Office 12.02 111Punty of Los Angeles Department of PubllArks DISTRIBUTION GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION 1 Dist.Office Sheet 1 of 2 GEOLOGIC REVIEW SHEET 1 Geologist 900 So.Fremont Ave.,Alhambra,CA 91803 Soils Engineer TEL.(626)458-4925 1 GMED File _ Grading Section 4th Review Inspector ArchJEngineer Tract 1 Parcel Map Lot(s) Parent Tract Location City of Rolling bills Site Address 3 Appaloosa Lane APN 7569-026-011 Geologist Sassan Geosciences, Inc. Developer/Owner Fozoonmehr Solis Engineer Same as above Engineer/Arch. _Bolton Engineering(of record) Processing Center Date on Grading Plan 3/23/04 Grading P.C.No. 0403180001 For. Grading for SFR(9420 c.y.) Building P.C.No. N/A Geologic Report Dated Soils Engineering Report Dated Geology and Soils Engineering Report(s)Dated 8/30/06,3/16/06(5F0Z091) Additional Reports Reviewed EGL:2/14/05,1/19/04(03-137-010G):Hu Assoc.: 2/28/05,2/02/04(HA-4830-2) Action: Plan is not recommended for approval for reasons below. Remarks/Conditions: 1. As stated on the geologic review sheet dated 4/17/06: Required plans were not submitted. Two sets of plans must be submitted in order to complete the review. (Please note: an update geotechnical/geologic map, utilizing the most recent proposed grading plan,must be provided when the final grading plan is developed). 2. The consultant must provide subsurface data to verify the western and southern limits of the landslide considering that the current consultant has rejected EGL's subsurface investigation,with the exception of borings B-7 and B-9,as well as their interpretations. 3. Data presented forthe site indicates rotational failure of the landslide,however,block slides are illustrated,showing a failure surface along a planar discontinuity with corresponding analysis. Either provide additional justification forthe configuration for a planar slide or revise the sections to illustrate a configuration consistent with rotational failure. Provide revised stability analysis for the revised sections. (For definition,refer to Page 338,Figure 13-1,in Landslides: Investigation and Mitigation, Special Report 247,Turner and Schuster,eds., 1996). 4. The intent of prior remark#7 was to have several cross-sections through the steepest areas of the natural ascending slope to determine any additional surcharge onto the proposed piles. Cross-section F-F'partially addresses this concern but may not represent the highest surcharge the piles may experience due to the steep ascending slope. Therefore,please provide more cross-sections,roughly in this orientation,covering the area of the proposed piles,and provide stability analyses to determine the surcharge. 5. Provide the logs of P-1 and P-2. Information that must be included, as for all subsurface logs, are the date drilled,the method of drilling,and the person or persons that logged the excavation. Please also include this information on the logs for borings B-1 through B-B. 6. The response to prior comment#10 cannot be evaluated until plans are received that depict the proposed location of the sewage disposal system. After the location has been determined and this information has been furnished to the geotechnical consultants the following will be required: Based on the recommended location,data on the possible adverse impact of the private sewage disposal system relative to site stability and adjacent properties must be provided. The consultant must discuss the path of migration of effluent and whether daylighting of the effluent will occur. Stability calculations must consider the effect on groundwater. Show on geologic cross section(s)the anticipated path and saturation from the effluent based on hydrogeology of the site. 7. All recommendations of the consulting geologist and soils engineer must be incorporated into the design or shown as notes on the plans. 8. The plan must be specifically approved by the consultant geologist and soils engineer by manual,original signatures and dates on each sheet prior to approval by the Geology Section. Submit two(2)sets for review. (continued on next sheet) unty of Los Angeles Department of Public orks GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION Sheet 2 of 2 GEOLOGIC REVIEW SHEET 9. Add the following as notes to the plan: In-grading inspections must be made by the consulting geologist and soils engineer. Monthly in-grading inspection reports must be submitted directly to the Geology and Soils Section by the consultants. Rough grading must be approved by a final engineering geology and soils engineering report. An As-Built Geologic Map must be included in the final geology report. Provide a final report statement that verifies work was done in accordance with report recommendations and code provisions(Section 3318.1). The final report(s)must be submitted to the Geotechnical and Materials Engineering Division for review and approval. Foundation excavations must be inspected and approved by the consulting geologist and soils engineer prior to the placing of steel or concrete. 10. Show all proposed corrective measures(piles,deep removals,etc.)on the plan. 11. . The Soils Engineering review dated ((210(ob is attached. • Prepared by eviewed by D to October 11,2006 Karin Burger P:\Gmepub\Geclogy Review\Forms\Form05.doc 10/20/03 .___• • • COUNTY OF LOS ANGELES DEPARTMENT OF PUBLIC WORKS GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION SOILS ENGINEERING REVIEW SHEET Address: 900 S. Fremont Ave.,Alhambra,CA 91803 District Office 12.02 Telephone: (626)458-4925 Job Number B372001 Fax: (626)458-4913 Sheet 1 of 1 DISTRIBUTION: Single Family Residence Drainage Grading Location 3 Appaloosa Lane, City of Rolling Hills 1 Geo/Soils Central Fife Developer/Owner Fozoonmehr 1 District Engineer Engineer/Architect Bolton Engineering_ 1 Geologist Soils Engineer Sassan Geosciences(5F0Z091) 1 Soils Engineer Geologist EGL 1 Engineer/Architect Grading Plan Check No.0403180001 Review of: Grading Plan Dated By Processing Center 3/23/04 Soils Engineering and Engineering Reports Dated 8/30/06 and 3/16/06 Soils Engineering Reports By Hu Dated 2/28/05 and 2/2/04 Geologic Reports By EGL Dated 2/14/05 and 1/19/04 Previous review sheet dated 4/20/06 ACTION: Grading plan is not recommended for approval. REMARKS: 1. Requirements of the Geology Section are attached. Additional slope stability analysis and back calculation to determine the shear strength parameters of the slide plane materials may be required when the geology of the site(limits and depth of landslide,etc.)is conclusively determined. 2. Independent analyses give higher active EFP's(or loads)than those recommended in the 8/30/06 report.Per County policy, the slope with the proposed mitigation must have a Factor of Safety of at least 1.5.(That is,the combine resistance from the soils and the soldier piles must be at 1.5 times the driving force due to the landslide mass).Verify and provide revised active EFP's(or loads)as necessary. Provide additional or revised analyses of the proposed soldier pile as necessary. 3. Based on the recommended location of the proposed sewage system,provide data on the possible adverse impact of the private sewage disposal systems)relative to site stability and adjacent properties. Discuss the path of migration of the effluent and whether ponding or daylighting of the effluent will occur. Stability calculations must consider the effect of ponding/perched groundwater. 4. Show the following on the grading plans: a. Soldier pile plan and details(diameters,spacing,lengths,embedment depth,etc.). b. Approximate limits and depth of removal and recompaction of unsuitable soils under the proposed floor slab, per the soils engineer. c. Locations of dewatering wells,per the soils engineer. d. Location of subdrains as necessary. e. Location of private sewage disposal system(s). f. All recommended mitigation measures. 5. The Soils Engineer of record must review the grading plans and sign and stamp the plans in verification of his recommendations. Original manual signature and wet stamp are required. 6. Submit two sets of grading plans to the Soils Section for verification of compliance with County codes and policies. 7. Include a copy of this review sheet with your response. NOTE(S)TO THE PLAN CHECKER/BUILDING AND SAFETY E ON-SITE SOILS ARE CORROSIVE TO FERROUS METALS A ( ' ANSION POTENTIAL. pared by ` , ExP.sUro7 Date 10/26/06 Ga L: ., NOTICE: Public safety,relative to geotechnlcal subsurface exploration • C�� tiN`C;_ate. cordance with current codes for excavations, inclusive of the Los Angeles County Code,Chapter 11.48,and the State 7�.'ifDrn�41 ' ." onstruction Safety Orders. Gan:appaloosa-3-gp .. • • DR. SHAHRAM FOZOONMEHR 28701 HIGHRIDGE ROAD ROLLING HILLS ESTATE, CALIFORNIA 90274 ADDENDUM No. 1 TO PRELIMINARY GEOTECHNICAL ENGINEERING AND ENGINEERING GEOLOGY INVESTIGATION FOR 3 APPALOOSA LANE ROLLING HILLS Response to Review Letters Dated 4/17/06 and 4/20/06 Prepared By SASSAN Geosciences, Inc. 1290 North Lake Avenue, Suite 204 Pasadena, California 91104-2869 August 30, 2006 • • SAS SASSAN Geosciences,Inc. August 30, 2006 Dr. Shahram Fozoonmehr 28701 Highridge Road Rolling Hills Estate, CA 90274 Subject: Addendum No. 1 to Preliminary Geotechnical Engineering and Engineering Geology Investigation (Response to Review Letters Dated 4/17/06 and 4/20/06) 3 Appaloosa Lane, Rolling Hills SAS File Number: 5F0Z091 Current Reference Report/ Document Prepared by Report/Letter Log No. Date Preliminary Soils & Geol. 5F0Z091 03-16-06 SASSAN Geosciences, Inc. Geologic Review Sheet 0403180001 04-17-06 County of Los Angeles Soils Eng. Review Sheet 0403180001 04-20-06 County of Los Angeles Dear Mr. Fozoonmehr: SASSAN Geosciences, Inc. (SAS) has prepared this addendum to our preliminary geotechnical engineering and engineering geology investigation for the proposed development to respond to the questions raised by the County in their Geologic Review 1290 North Lake Avenue.Suite 204.Pasadena.California 91104-2869 . (626)345-1819 . Fax(626)345-1820 . 5asgeoinc@aol.conl • • Sheet dated 04/17/06 and Soils Engineering Review Sheet dated 04/20/06. A copy of the Review Sheets is presented in Attachment No. 1. The questions are responded to in the order raised. ACKNOWLEDGMENT AS CONSULTANT OF RECORD This letter is to acknowledge our appointment as the "Consultant of Record" for the referenced property. We have reviewed the reports prepared by previous consultants and County Review Sheets referenced herein (List of References). Please be advised that in our original Preliminary Geotechnical Engineering and Engineering Geology Investigation report dated 03/16/06, we used very limited data (bore holes B-7, B-9; copies of logs provided in Attachment No. 8) from the reports prepared by Environmental Geotechnology Laboratory, Inc. and Hu Associates, Inc., and we do not concur with either report and do not accept responsibility for the findings and laboratory test results presented in the reports by Environmental Geotechnology Laboratory, Inc. and Hu Associates, Inc. Geologic Review Sheet Q1 - The Geotechnical and Materials Engineering Division requires that a letter/report from both the prior and "new" engineering geologist-of-record be submitted when a change in consultant occurs during the process of review or when construction is in progress. The "new" engineering geologist-of-record must review and reference all reports prepared for the subject site (including EGL report dated 2/14/05). Al - SASSAN Geosciences did indeed review all known previous reports as well as L.A. County review sheets prepared for the site. The February 14, 2005 report by EGL, SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 2 of 24 • • Inc. was not referenced separately, as it was included as part of the Hu Associates, Inc. report dated February 28, 2005. A new reference list, including all known reports by both Hu Associates and EGL, Inc., as well as Geologic and Soil Engineering Review Sheets prepared by Los Angeles County, is attached. SASSAN Geosciences, Inc. is not in a position to request a change-of-consultant letter from the prior"Geologist and Soil Engineer of Record". It is our opinion that the owner should request this letter. Q2 - The content of the change-of-consultant letter must include clarification and/or resolution of pertinent discrepancies in professional opinions and data, e.g. an explanation must be provided as to why the "new" consultant-of-record did not consider and/or accept all previous subsurface data. A2 - SASSAN Geosciences, prior to conducting a new, independent investigation of the site, reviewed the EGL, Inc. report and made the following notes regarding the EGL investigation and characterization of the landslide: • The initial report by EGL, Inc. did not acknowledge the landslide present on the site even though it was indicated on the Geologic Map (Dibblee) included in their report, and is obvious based on the surface topography at the site. • Based on our review, as well as cross sections A-A' through E-E' presented by EGL, Inc. in their report/response dated 2/14/05, Borings 1 through 6 did not penetrate the landslide and were therefore inadequate to determine the landslide thickness or geometry. SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 3 of 24 • Borings 7, 8, 9 presented in the EGL, Inc. report dated 2/14/2005, penetrated the landslide, however by themselves were inadequate to characterize the landslide limits and subsurface geometry. A review of the EGL, Inc. report dated 2/14/05 indicates that the basal rupture surface depicted in cross sections A-A' through G-G' is queried in its entirety in every cross section. It is our opinion that such characterization is inadequate and cannot and should not be used by Hu Associates, Inc., by SAS or others to design remedial grading or other means to stabilize the site landslide and to construct site improvements. • The goal of the investigation by SAS was to provide a minimum of two points in each cross section on the basal rupture surface of the landslide such that no question marks would be necessary. This goal was achieved. Data compiled by EGL, Inc. was used sparingly for the reasons presented above, and included (on the previous geologic map presented) EGL borings B-7 and B-9 (copies of logs provided in Attachment No. 8). Q3 - Required plans were not submitted. Two sets of plans must be submitted in order to complete the review. (Please note: an update geotechnical/geologic map, utilizing the most recent proposed grading plan, must be provided when the final grading plan is developed). A3 - Acknowledged plans will be submitted as requested. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 4 of 24 • Q4 - On the geologic map (Figure A-2) indicate and label the relative limits of the landslide as mapped by: the current consultant; in the most recent EGL report (referenced above); Cleveland; and Dibblee. Cross-sections must be updated, as appropriate. A4 - It is the opinion of SAS, based on the reasons presented in item Q2 above, that it is neither appropriate nor prudent to include that landslide limits as depicted by EGL, Inc. on their most recent map (2/14/2005) on our Geologic Map. The landslide limits presented in the EGL, Inc. report are queried in their entirety and therefore should not and will not be included in the characterization of the landslide limits and determination of measures to stabilize the landslide. Further, the EGL, Inc. Geologic Map included in the 2/14/2005 report erroneously labels their interpreted landslide boundary as "Approximate and Estimated Landslide Boundary(EGL, 2004)". No such boundary is presented on the Geologic Map included in the EGL, Inc. report dated January 19, 2004. The queried landslide limits are apparently the interpreted limits based on the 2/14/2005 data. A small recent landslide labeled on the Geologic Map presented in the 2004 by EGL, Inc. and again on the 2005 Geologic Map is also queried in its entirety and, in our opinion, has no basis in fact based on the exploration by EGL, Inc. or by our investigation. "Recent" landslides are most normally designated as such due to new scarps or other topographic evidence of landslide activity. No such evidence is present at the site, and it is therefore our opinion that the "recent landslide" should not be included on our map or cross sections. Dibblee and Cleveland maps: The geologic map by Dibblee, 1999, exactly replicates (to the extent possible at scale of 1:24,000 Dibblee; and 1:12,000 Cleveland) the limits of the landslide as depicted on the geologic map by Cleveland SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 5 of 24 (1976). This can be verified by duplicating the maps to similar scales and utilizing a light table. It is our opinion that attempting to transfer the landslide limits is not warranted or necessary for the following reasons: 1. It is difficult to transfer data from maps utilizing a topographic base map with a scale of 1:24,000 (or 1:12,000) to a map with a scale used for engineering reports. No common data points are typically present and therefore the results introduce more error to the landslide limits than are acceptable in preparing Geologic Maps and Cross Sections to be utilized for engineering analyses. As an example, the EGL, Inc. 2005 report attempted to depict the Cleveland and Dibblee landslide limits (which as pointed out above are identical) on the Geologic Map. The results are predictably woefully inaccurate, showing different landslide limits as well as landslide deposits outside areas where the site landslide (see the interpreted limits of Cleveland) could reasonably be present. 2. The landslide limits shown by Cleveland and Dibblee are based on the profound slope break and limits of hummocky ground, which define the landslide. These limits are adequately similar to our interpretation of the landslide limits, for the purposes of the investigation and engineering analyses. An exception in the southern portion of the landslide, where Cleveland's map differs from our interpretation, has been added to our geologic map and is discussed in a following portion of this response. SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 6 of 24 • 1110 3. It is our opinion that the landslide limits shown on the Cleveland and Dibblee maps should be used in similar fashion to the potential Liquefaction and Earthquake Induced Landslide maps published by the California Geological Survey, as a guide to directing consultants to areas where more detailed studies, including subsurface investigation, should be conducted. The maps, however, should not be used directly for geologic and engineering analysis. Notes on both maps tend to substantiate this position, as follows: a. Cleveland, 1976: "This map is a product of a regional study to delineate geologic features of possible engineering significance. It is not a "hazards map" and it should not be used for final planning of specific engineering structures. Question of siting and site-related structural design for a given locality may require detailed geologic and engineering analyses depending on the local geologic conditions and the intended use. Each of the many landslides in the area has its own setting and characteristics that determine its present degree of stability. The limitations of the investigation precluded identifying and confirming all the landslides in the area. Further, the boundaries of many landslides indicated on the map cannot be determined precisely without additional subsurface exploration, and future detailed study may show that some of the features mapped as landslides do not represent ground failure. Some lithologic and structural elements of the bedrock terrane are shown in areas of mapped surficial deposits where isolated outcrops, fragments of float, topographic expressions, or man-made excavations suggest the nature of the subsurface geology". b. Dibblee, 1999: "The data depicted herein are based on reconnaissance field geologic mapping and data compilation by T. W. Dibblee, Jr., with emphasis on bedrock geology. No warranty as to actual conditions is expressed or SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 7 of 24 • implied. Site-specific conditions should be verified by the user by detailed surface mapping and/or sub-surface exploration. Topographic changes associated with recent development may not be shown. This map does not show Alquist-Priolo earthquake fault zones and/or seismic hazard zones, if any, that may exist in this area. For additional information on these subjects please see California Division of Mines Special Publication 42 and visit their web site http://www.consrv.ca.gov/dmg/shezp/." It is our opinion that the investigation preformed by our office adequately evaluates both the limits and subsurface geometry of the site landslide and that adding the landslides limits of Cleveland 1976, will unnecessarily clutter the geologic map and cross sections and will have no legitimate use in our interpretation of the landslide, with the exception as discussed below. 4. We have plotted the limits of the landslide, as mapped by Cleveland and Dibblee, in the southern portion where the limits of the landslide differ significantly from our interpretation, in that they extend further to the south approximately 180 feet and would include the area where the percolation tests were conducted, and boring B-8 was drilled. No evidence of landsliding was found in boring B-8. It appears that the landslide limits interpreted by Cleveland correspond to a small gully as indicated on the USGS topography. No such gully was observed in our field investigation and none is present on the large scale topography utilized for this project. It is therefore our opinion, based on both surface and subsurface evidence, that the landslide limits as depicted on our Geologic Map are correct. SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 8 of 24 • • Q5 - Provide graphic logs for each excavation (per page 17 of the Manual for the Preparation of Geotechnical Reports: http://ladpw.org/gmed/manual.pdf). A5 - It is our opinion that graphics added to boring logs are largely cartoonish due to the nature of borehole logging (as opposed to backhoe trenches used for structural or fault interpretation), and do not aid in interpreting the geology of the site either by the consultant geologist or by the reviewer. We have however, added graphics to the boring logs attached to this response (see Attachment No. 8). Q6 - The scale of the geologic map must match the scale of the cross-sections. It appears that due to the difference in scales (1"=30' map; 1"=50'cross-sections) there are significant discrepancies with regards to landslide limits between the map and cross-sections. The consultant must correct these discrepancies prior to complete review and provide maps and cross-sections at the same scale or an easily resolvable scale (e.g. 1"=20'for map and 1"=40'for cross-sections). A6 - We have changed the scale of the map and cross sections to the same scale, l"=40'. We have further checked each cross section for consistency and made corrections/ additions as necessary. The revised Geologic Map and Cross Sections are attached. Q7 - Sections A-A', B-B', and D-D'are oblique to the slope ascending from the equestrian trail to Buggy Whip. The slope gradient, measured normal to the contours, are considerably steeper when sections are oriented N83E, N88E, and N85W, respectively,from the equestrian trail. Revise cross-sections to consider the steeper slopes and provide slope analyses based on the revised topographic profiles. SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 9 of 24 • • A7 - Sections A-A', B-B' and D-D' were drawn approximately parallel to the direction of movement of the landslide in order to evaluate the stability of the landslide mass. These sections were not utilized to evaluate the stability of the ascending slope between the landslide and the homes on Buggy Whip to the west, primarily because the proposed grading and construction will generally not impact this slope and the geology is favorable (dips in-to-slope). We do not find it appropriate to modify these cross-sections as they serve the purpose for which they were intended, however, we have drawn a new cross section, F-F', perpendicular to the slope contours and in an area where proposed grading most reasonably could impact the stability of the subject slope. The section is, in our opinion, a critical section that reasonably evaluates the stability of the slope. The results of the analysis indicate a factor of safety of 1.653 for static condition, and a factor of safety of 1.106 for pseudo-static condition. The analyses are presented in Attachment No. 4. Q8 - Please verify the term "groove". Does this term correspond to striation and/or slickenside? The consultant has indicated the trend but what is the plunge of the striae/grooves? A8 - The term "groove" was used in the report as defined in the American Geological Institute Glossary of Geology, 1980, Second Edition as follows: "groove [fault] one of a series of parallel scratches developed along a fault surface. A groove is a larger structure than a striation. CF: slickensides; mullion structure; slip scratch." SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 10 of 24 I Both striations or striae, as well as grooves were observed on the basal rupture surface of the landslide and were described as such. Landslide studies borrow terms from fault terminology as the features on fault and landslide surfaces are similar. We prefer not to use the term slickensides to describe landslide features to avoid confusion with faulting, although the features produced often appear identical. It is our opinion that depicting the plunge of the striations and grooves will not provide meaningful information to interpreting the geometry of the landslide, particularly because the slide has failed across bedding or along strike. The cross sections were drawn to generally, as much as possible, parallel the direction of movement of the landslide, and the basal rupture surface of the slide was interpreted by connecting points in a minimum of two borings where the slide surface was measured. We believe this method is the most accurate way to determine the orientation of the slide surface. Q9 - Review Section E-E', which shows SAS B-5, but which is really EGL B-7. Correct this error as appropriate. A9 - Acknowledged and corrected. Q 10 - Prior to approval of the grading plan, the recommended location of the on-site sewage disposal must be determined and shown on the grading plan. SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 11 of 24 • • Based on the recommended location, data on the possible adverse impact of the private sewage disposal system relative to site stability and adjacent properties must be provided. The consultant must discuss the path of migration of effluent and whether daylighting of the effluent will occur. Stability calculations must consider the effect on groundwater. Show on geologic cross section(s) the anticipated path and saturation from the effluent based on hydrogeology of the site. A10 - Please see our comment (A10) on page 22. Q11 - All recommendations of the consulting geologist and soils engineer must be incorporated into the design or shown as notes on the plans. All - Acknowledge and concur. Q12 - The plan must be specifically approved by the consultant geologist and soils engineer by manual, original signatures and dates on each sheet prior to approval by the Geology Section. Submit two (2) sets for review. Al2 - Acknowledge and concur. Q13 - Add the following as notes to the plan: In-grading inspections must be made by the consulting geologist and soils engineer. Monthly in-grading inspection reports must be submitted directly to the Geology and Soils Section by the consultants. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 12 of 24 • 410 Rough grading must be approved by a final engineering geology and soils engineering report. An As-Built Geologic Map must be included in the final geology report. Provide a final report statement that verifies work was done in accordance with report recommendations and code provisions (Section 3318.1). The final report(s) must be submitted to the Geotechnical and Materials Engineering Division for review and approval. Foundation excavations must be inspected and approved by the consulting geologist and soils engineer prior to the placing of steel or concrete. A13 - Acknowledge and concur. Q14 - Show all proposed corrective measures (piles, deep removals, etc.) on the plan. A14 - All proposed corrective measures (piles, retaining walls, deep removals, etc.) are shown on the plan. Q15 - The Soils Engineering review dated 4/20/06Is attached. A15 - Acknowledged. Copies of the Review Sheets are presented in Attachment No. 1. Soils Engineering Review Sheet Q 1 - Provide a change of consultant letter that will indicate the Soils Engineer of record for this project. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 13 of 24 • ! Al - The change of consultant letter that indicates the Soils Engineer-of-Record for this project is provided earlier in this report (page 2). Q2 - The Soils Engineer of record must acknowledge all pertinent previous soil reports and make a statement that he agrees with their findings, conclusions and recommendations or provide appropriate modifications. (It is noted that the analyses presented in the 3/16/06 report utilized primarily new subsurface information. However, some subsurface information from previous investigations is included in the geotechnical map provided in the 3/16/06 report). A2 - We have reviewed the reports referenced herein (List of References). Please be advised that in our original Preliminary Geotechnical Engineering and Engineering Geology Investigation report dated 03/16/06 we used very limited data (bore holes B-7, B-9; copies of logs provided in Attachment No. 8) from the reports prepared by Environmental Geotechnology Laboratory, Inc. and Hu Associates, Inc., however we do not concur with neither we accept responsibility for the findings and laboratory test results presented in the reports by Environmental Geotechnology Laboratory, Inc. and Hu Associates, Inc. Q3 - Requirements of the Geology Section are attached. A3 - The comment respectfully noted. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 14 of 24 • • Q4 - Additional slope stability analysis and back calculation to determine the shear strength parameters of the slide plane materials may be required when the geology of the site (limits and depth of landslide, etc.) is conclusively determined. A4 - Additional back-calculation analyses are performed on the revised cross-section E- E to determine the shear strength parameters of the slide plane materials. A series of back-calculation analyses were performed, using an estimated pre-slide topography at a dry condition (no groundwater at the moment of failure). The plan line of the cross-section is presented on Figure A-2 in Attachment No. 2. Section E-E used in back-calculation analyses is presented on Figure E-2 in Attachment No. 3. The following sets of strength parameters were obtained from our back-calculation effort: Back-Calculations Section E-E C F.S. (degrees) (psf) 10 530 1.000 11 457 1.000 12 384 1.000 13 309 1.000 14 234 1.000 15 159 1.000 SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 15 of 24 • • A copy of a set of back-calculation analysis for cross-section E-E is presented in Attachment No. 3. Additional deep-seated stability analyses are performed on the revised cross-section C-C and new cross-section F-F to determine the factor of safety of the bedrock material underlying the landslide debris. Sections E-E and F-F used in stability analyses are presented on Figures F-1 and F-3 in Attachment No. 4. The stability analyses for these sections resulted in a minimum factor of safety of 1.653 for static condition, and a minimum factor of safety of 1.106 for pseudo-static condition. Copies of deep-seated stability analyses for cross-sections C-C and F-F are presented in Attachment No. 4. Q5 - Provide additional or revised analyses of the proposed soldier pile considering the following: a. Revised shear strength of the slide plane materials as determined in Remarks NO. 4. Provide revised analyses of proposed soldier piles using revised shear strength parameters as necessary. b. Slide wedges used in the pile analyses for Pile Rows F, G, and H. It appears that the only a portion of the slide wedge was considered in each the pile analyses for piles in Rows F, G, and H. For example, the analyses of piles in Row G only consider the slide wedge extending from the row offriction piles to the proposed soldier piles in Row G. Yet the slide wedge extends to soldier piles in Row C (i.e., beyond the row offriction piles) as shown in Section E-E, and this larger wedge is approximately twice the size of the slide wedge analyzed. Verify and provide revised soldier pile analyses as necessary. (It is noted that SAS SASSAN Geosciences,Inc. 5FOZ091 August 30,2006 Page 16 of 24 • • the calculated EFP of 30 pcf acting on the soldier piles is less than the commonly recommended value of 43 pcffor a pile-supported wall with a 2:1 H:V backslope). c. Passive equivalent fluid pressures (EFP's) recommended for soldier piles. Independent analyses give lower passive EFP's than the recommended passive EFP's of 1083 to 1431 pcffor the onsite bedrock. Verify and provide revised passive EFP's as necessary. A5 - Following are responses to each of the comments in item Q5: a. Additional equivalent fluid pressure (EFP) analyses were performed for the proposed soldier pile rows based on the revised geologic cross-sections and revised shear strength parameters of the slide plane materials as provided in item A4 above. Sections A-A, C-C, D-D and E-E used in EFP analyses are presented on Figures H-1, H-2, H-3 and H-4 in Attachment No. 5. The lateral design pressure values obtained from our EFP analyses are provided in the following table: SAS SASSAN Geosciences,inc. 5FOZ091 August 30,2006 Page 17 of 24 • • Active Earth Pressure for Lateral Support System Active Total Lateral Depth of ROW EFP Load Application (pcf) (kips) (ft) A 156 52.8 26 B 162 83.1 32 C 202 68.3 26 D 73 77.6 46 E 92 47.1 32 F 69 35.2 32 G 43 0 39 H 43 0 25 Copies of EFP analyses for the proposed soldier pile rows are presented in Attachment No. 5. b. The equivalent fluid pressure (EFP) analyses performed for the proposed soldier pile rows "F", "G" and "H" were presented in Appendix H of our report dated 03/16/06 referenced above. The EFP analysis for the proposed soldier pile row "F" was performed on cross- section C-C (Figure H-2 in Appendix H of 03/16/06 report). The entire wedge of slide mass between rows "C" and "F" participated in the analysis. This includes blocks "0" through "5". SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 18 of 24 • • The EFP analysis for the proposed soldier pile row "G" was performed on cross-sections A-A (Figure H-1 in Appendix H of 03/16/06 report) and E-E (Figure H-4 in Appendix H of 03/16/06 report). The entire wedge of slide mass between rows "D" and "G" (section A-A; Figure H-1; blocks "1" through "5") and rows "C" and "G" (section E-E; Figure H-4; blocks "2" through "5") participated in the analysis. The EFP analysis for the proposed soldier pile row "H" was performed on cross-section D-D (Figure H-3 in Appendix H of 03/16/06 report). The entire wedge of slide mass between the rows "E" and "H"participated in the analysis. This includes blocks "1" through "6". c. We have performed a two-dimensional study of a passive wedge without taking into account the resistance of the sides of the failing wedge. The analysis resulted in a minimum passive earth pressure increasing at the rate of 575 psf per foot of depth. The results of the passive pressure analysis are presented on Figure I-5 in Attachment No. 6. Following are our revised recommendations for passive pressure: Passive earth pressure increasing at the rate of 575 psf per foot of depth, to a maximum of 5,750 psf, must be used in the design of the soldier piles. The soldier piles must be assumed fixed at the slide plane contact. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 19 of 24 • • The suggested passive pressure value may be doubled for an isolated pile condition, when piles are placed a minimum distance of 2.5 times their diameter from each other (d>2.5D). Q6 - The 3/16/06 report recommends that the proposed residential structure be supported on friction piles that will be embedded into bedrock. The report also recommends that the proposed barn be supported on shallow footings that will be founded on engineered fill or in native soils (i.e., colluvium or landslide debris). If shallow footing foundations founded on compacted fill, colluvium or landslide debris are proposed, then provide additional laboratory test results (consolidation test results, etc.) to substantiate that the colluvium or landslide debris will be suitable for supporting certified fill and structures. A6 - The proposed barn shall be supported on friction piles. The same recommendations presented for the design of the support for the proposed residence shall apply. Q7 - Recommend the additional Equivalent Fluid Pressures (EFP's)for the design of the proposed retaining walls (as shown on the plan) that may be subject to surcharge from the landslide debris as necessary. Provide data and analyses to substantiate the additional EFP's recommended. A7 - The retaining walls, garden walls, and hardscaping atop the ancient slide mass are not subject to any additional lateral pressures. Due to the fact that said walls do not traverse from the top of the ancient slide mass to the areas that are not underlain by the ancient slide mass and due to the fact that the proposed soldier piles would arrest the potential future movements, the retaining walls will never be subject to potential slide movement EFPs. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 20 of 24 • • Q8 - Also,provide foundation recommendations for the proposed retaining walls shown on the plans. A8 - Please see page 26 of 35 of the 3/16/06 report. A comprehensive and conservative set of recommendations was presented in said report, referenced herein. Q9 - Address whether the proposed mitigation measures will incorporate the areas of the proposed access driveway as shown on the plans. If so, then show the recommended mitigation for the proposed driveway. If not, then provide additional recommendations with substantiating data and analyses as necessary. A9 - The exact geometry of the access driveway is not available to the undersigned. The general design of the driveway, however, is comprised of paved surfaces and the surrounding garden walls. The design of the paved area is presented on page 32 of the original SAS report dated 3/16/06. The design of the garden walls/retaining walls that would accompany the driveway is presented on page 26 of the same report. Q 10 - Provide data on the possible adverse impact of the private sewage disposal system(s) relative to site stability and adjacent properties. (Based on the subsurface information provided in the 2/28/05 report, the depth of the landslide may be more than 50 feet). Discuss the path of migration of the effluent and whether ponding or daylighting of the effluent will occur. Stability calculations must consider the effect of ponding/perched groundwater. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 21 of 24 • • A10 - As mentioned on the original SAS report "The proposed seepage pits will be located away from the proposed residence and away from the ancient landslide area. Three 2'-diameter boreholes; B-8, P-1, and P-2 were drilled and tested for percolation. The cone of influence that encompasses the boundary of the effluent does not reach the slide mass and does not interfere with the proposed improvements. The proposed private sewage disposal system will not adversely affect the proposed improvements; neither will it affect the neighboring properties. " To demonstrate this graphically, two (2) cross-sections were prepared and are presented in Attachment No. 7. These cross-sections clearly demonstrate that the cone of influence of the effluents does not interfere with the improvements and they do not compromise the stability of the site. Q 11 - Show the following on the grading plans: a. Soldier pile plan and details (diameters, spacing, lengths, embedment depth, etc.). b. Approximate limits and depth of removal and recompaction of unsuitable soils under the proposed floor slab,per the soils engineer. c. Locations of dewatering wells, per the soils engineer. d. Location of subdrains as necessary. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 22 of 24 • • e. Location of private sewage disposal system(s). f. All recommended mitigation measures. A l l - The consulting civil engineer of record will provide the requested items outlined above on a set of plans and under a separate submittal. Q12 - The Soils Engineer of record must review the grading plans and sign and stamp the plans in verification of his recommendations. Original manual signature and wet stamp are required. Al2 - Upon presentation of the grading plans the Soils Engineer of record will review the grading plans and sign and stamp the plans in verification of his recommendations. Q13 - Submit two sets of grading plans to the Soils Section for verification of compliance with County codes and policies. A13 - The owner and the consulting civil engineer of record are informed regarding this request. The plans will be submitted to the Soils Section for your verification. Q14 - Include a copy of this review sheet with your response. A14 - A copy of this Review Sheet is presented in Attachment No. 1. SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 23 of 24 • • We appreciate the opportunity to be of service to you. If you have any questions, please call our office. Sincerely, vsoFEss;SASSAN GEOSCIENCES, I O 1 , y Q G Z� y No.2579 70 Exp.630-07 Sassan A. Salehipour, G. . lFonto.*° Thomas G. Hill, C.E.G. President Engineering Geologist SAS/TH:ak/5foz09 I e2.doc Attachments SAS SASSAN Geosciences,Inc. 5F0Z091 August 30,2006 Page 24 of 24 • List of References 1. Dibblee, T.W., Jr., 1999, Geologic Map of the Palos Verdes Peninsula and Vicinity, Dibblee Geological Foundation, Map DF-70, Scale 1:24,000 2. Cleveland, G.B., 1976, Geology of the Northeast Part of the Palos Verdes Hills, Los Angeles County, California, Map Sheet 27, Scale 1:12,000 3. Hu Associates, Inc., February 2, 2004, Preliminary Soil and Geology Investigation Report 4. Environmental Geotechnology Laboratory, Inc., January 19, 2004, Engineering Geologic Investigation, Proposed Single Family Residential Development, 3 Appaloosa Lane, Rolling Hills, California, EGL Project No. 03-137-01OG 5. County of Los Angeles, Geologic Review Sheet, April 22, 2004, Plan Check No. 0403180001 6. County of Los Angeles, May 11, 2004, Soils Engineering Review Sheet, Grading Plan Check No. 0403180001 7. County of Los Angeles, Geologic Review Sheet, April 21, 2005, Plan Check No. 0403180001 8. County of Los Angeles, Soils Engineering Review Sheet, May 12, 2005, Plan Check No. 0403180001 9. Environmental Geotechnology Laboratory, Inc., February 14, 2005, Response to County of Los Angeles Department of Public Works, Geotechnical and Materials Engineering Division, Geotechnical Review Sheet, Grading Plan Check No. • 111 0403180001, 3 Appaloosa Lane, Rolling Hills, California, EGL Project No. 03-137- 010GR 10.Hu Associates, Inc., February 28, 2005, response to County of Los Angeles Geologic and Soils Engineering Review Sheets, Proposed Single Family Residence, 3 Appaloosa Lane, Rolling Hills, California, Project No. HA-4830-2 i w List of Attachments Attachment No. 1 Geologic Review Sheet dated 04/17/06 and Soils Engineering Review Sheet dated 04/20/06 Attachment No. 2 Maps and Cross-Sections Figure A-2 Geologic Map (Site Plan) Figure A-3 Geologic Sections A-A and B-B Figure A-4 Geologic Sections C-C and D-D Figure A-5 Geologic Sections E-E and F-F Attachment No. 3 Back-Calculation Analyses on Section E-E Figure E-2 Section E-E Attachment No. 4 Bedrock Stability Analyses on Sections C-C and F-F Figure F-1 Section C-C Figure F-3 Section F-F Attachment No. 5 Equivalent Fluid Pressure Analyses Figure H-1, Section A-A, Pile Rows D and G Figure H-2, Section C-C, Pile Rows A, B, C and F Figure H-3, Section D-D, Pile Rows E and H Figure H-4, Section E-E, Pile Rows A, B, C and G Attachment No. 6 Passive Pressure Analyses Figure I-5 Passive Pressure Analyses Attachment No. 7 Sections X-X and Y-Y for Private Sewage System Figure J-1, Section X-X Figure J-2, Section Y-Y • • Attachment No. 8 Copies of Logs of Bore Holes B-7 and B-9 by Environmental Geotechnology Laboratory, Inc. Copies of Logs of Bore Holes B-1 through B-8 by SASSAN Geosciences, Inc. Dist.Office 12.02 County of Los Angeles Department of Public Works DISTRIBUTION 4 GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION 1 Dist. Office Sheet 1 of 2 GEOLOGIC REVIEW SHEET 1 Geologist 900 So.Fremont Ave.,Alhambra, CA 91803 Soils Engineer TEL.(626)458-4925 1 GMED File Grading Section Inspector Arch./Engineer Tract I Parcel Map Lot(s) Parent Tract Location City of Rolling Hills Site Address 3 Appaloosa Lane APN 7569-026-011 Geologist Sassan Geosciences,Inc. Developer/Owner Fozoonmehr Soils Engineer Same as above Engineer/Arch. Bolton Engineering Processing Center Date on Grading Plan 3/23/04 Grading P.C.No. 0403180001 For Grading for SFR(9420 c.y.) Building P.C.No. N/A Geologic Report Dated Soils Engineering Report Dated Geology and Soils Engineering Report(s)Dated 3/16/06(5F0Z091) Additional Reports Reviewed EGL:2/14/05,1/19/04(03-137-010G);Hu Assoc.: 2/28/05,2/02/04(HA-4830-2) Action: Plan is not recommended for approval for reasons below. Remarks/Conditions: 1. The Geotechnical and Materials Engineering Division requires that a letter/report from both the prior and"new"engineering geologist-of-record be submitted when a change in consultant occurs during the process of review or when construction is in progress. The"new'engineering geologist-of-record must review and reference all reports prepared for the subject site(including EGL report dated 2/14/05). 2. The content of the change-of-consultant letter must Include clarification and/or resolution of pertinent discrepancies in professional opinions and data,e.g.an explanation must be provided as to why the"nevi'consultant-of-record did not consider and/or accept all previous subsurface data. 3. Required plans were not submitted. Two sets of plans must be submitted in order to complete the review. (Please note: an update geotechnical/geologic map,utilizing the most recent proposed grading plan,must be provided when the final grading plan is developed). 4. On the geologic map(Figure A-2)indicate and label the relative limits of the landslide as mapped by: the current consultant; in the most recent EGL report(referenced above);Cleveland;and Dibblee. Cross-sections must be updated,as appropriate. 5. Provide graphic logs for each excavation (per page 17 of the Manual for the Preparation of Geotechnical Reports : http://ladpw.orq/gmcd/manual.ndf). 6. The scale of the geologic map must match the scale of the cross-sections. It appears that due to the difference in scales (1"=30'map;1"=50'cross-sections)there are significant discrepancies with regards to landslide limits between the map and cross-sections. The consultant must correct these discrepancies prior to complete review and provide maps and cross- sections at the same scale or an easily resolvable scale(e.g.1"=20'for map and 1"=40'for cross-sections). 7- Sections A-A', B-B', and D-D' are oblique to the slope ascending from the equestrian trail to Buggy Whip. The slope gradient,measured normal to the contours,are considerably steeper when sections are oriented N83E,N88E,and N85W, respectively,from the equestrian trail. Revise cross-sections to consider the steeper slopes and provide slope analyses based on the revised topographic profiles. 8. Please verify the term"groove". Does this term correspond to striation and/or slickenside?The consultant has indicated the trend but what is the plunge of the striae/grooves? 9. Review Section E-E',which shows SAS B-5,but which is really EGL B-7. Correct this error as appropriate. 10. Prior to approval of the grading plan,the recommended location of the on-site sewage disposal must be determined and shown on the grading plan. Based on the recommended location,data on the possible adverse impact of the private sewage disposal system relative to site stability and adjacent properties must be provided. The consultant must discuss the path of migration of effluent and whether daylighting of the effluent will occur. Stability calculations must consider the effect on groundwater. Show on geologic cross section(s)the anticipated path and saturation from the effluent based on hydrogeology of the site. (continued on next sheet) • County of Los Angeles Department of Public Works Sheet 2 of 2 GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION GEOLOGIC REVIEW SHEET 11. All recommendations of the consulting geologist and soils engineer must be incorporated into the design or shown as notes on the plans. 12. The plan must be specifically approved by the consultant geologist and soils engineer by manual,original signatures and dates on each sheet prior to approval by the Geology Section. Submit two(2)sets for review. 13. Add the following as notes to the plan: In-grading inspections must be made by the consulting geologist and soils engineer. Monthly in-grading inspection reports must be submitted directly to the Geology and Soils Section by the consultants. Rough grading must be approved by a final engineering geology and soils engineering report. An As-Built Geologic Map must be included in the final geology report. Provide a final report statement that verifies work was done in accordance with report recommendations and code provisions(Section 3318.1). The final report(s)must be submitted to the Geotechnical and Materials Engineering Division for review and approval. Foundation excavations must be Inspected and approved by the consulting geologist and soils engineer prior to the placing of steel or concrete. 14. Show all proposed corrective measures(piles,)deep removals,etc.)on the plan. 15. The Soils Engineering review dated i/'A/v 6 Is attached. • • • • Prepared by Reviewed by Date April 17,2006 Karin Va u z P:1Gmepub\Geology Review\Forms\Form06.doc 10/20/03 11) COUNTY OF LOS ANGELES DEPARTMENT OF PUBLIC WORKS GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION SOILS ENGINEERING REVIEW SHEET Address: 900 S. Fremont Ave.,Alhambra,CA 91803 District Office 12.02 Telephone: (626)458-4925 Job Number B372001 Fax: (626)458-4913 Sheet 1 of 2 DISTRIBUTION: Single Family Residence _Drainage Grading Location 3 Appaloosa Lane. City of Rolling Hills 1 Geo/Soils Central File Developer/Owner Fozoonmehr 1 District Engineer Engineer/Architect Bolton Engineering 1 Geologist Soils Engineer Sassan Geosciences(5F0Z091) 1 Soils Engineer Geologist EGL 1 Engineer/Architect Grading Plan Check No.0403180001 Review of: Grading Plan Dated By Processing Center 3/23/04 Soils Engineering and Engineering Report Dated 3/16/06 Soils Engineering Reports By Hu Dated 2/28/05 and 2/2/04 Geologic Reports By EGL Dated 2/14/05 and 1/19/04 - Previous review sheet dated 5/12/05 ACTION: Grading plan is not recommended for approval. REMARKS: 1. Provide a change of consultant letter that will indicate the Soils Engineer of record for this project. 2. The Soils Engineer of record must acknowledge all pertinent previous soil reports and make a statement that he agrees with their findings,conclusions and recommendations or provide appropriate modifications. (it is noted that the analyses presented in the 3/16/06 report utilized primarily new subsurface information. However,some subsurface information from previous investigations is included in the geotechnical map provided in the 3/16/06 report). 3. Requirements of the Geology Section are attached. 4. Additional slope stability analysis and back calculation to determine the shear strength parameters of the slide plane materials may be required when the geology of the site(limits and depth of landslide,etc.)is conclusively determined. 5. Provide additional or revised analyses of the proposed soldier pile considering the following: a. Revised shear strength of the slide plane materials as determined in Remarks No.4. Provide revised analyses of proposed soldier piles using revised shear strength parameters as necessary. b. Slide wedges used in the pile analyses for Pile Rows F, G,and H. It appears that the only a portion of the slide wedge was considered in each the pile analyses for piles in Rows F,G,and H. For example,the analyses of piles in Row G only consider the slide wedge extending from the row of friction piles to the proposed soldier piles in Row G. Yet the slide wedge extends to soldier piles in Row C(i.e., beyond the row of friction piles)as shown in Section E-E,and this larger wedge is approximately twice the size of the slide wedge analyzed. Verify and provide revised soldier pile analyses as necessary. (It is noted that the calculated EFP of 30 pcf acting on the soldier piles is less than the commonly recommended value of 43 pcf for a pile-supported wall with a 2:1 H:V backslope). c. Passive equivalent fluid pressures(EFP's)recommended for soldier piles. Independent analyses give lower passive EFP's than the recommended passive EFP's of 1083 to 1431 pcf for the onsite bedrock. Verify and provide revised passive EFP's as necessary. • COUNTY OF LOS ANGELES DEPARTMENT OF PUBLIC WORKS GEOTECHNICAL AND MATERIALS ENGINEERING DIVISION • SOILS ENGINEERING REVIEW SHEET Grading Plan Check No.0403180001 Sheet 2 of 2 REMARKS(CONT.): 6. The 3/16/06 report recommends that the proposed residential structure be supported on friction piles that will be embedded into bedrock. The report also recommends that the proposed barn be supported on shallow footings that will be founded on engineered fill or in native soils(i.e.,colluvium or landslide debris). If shallow footing foundations founded on compacted fill,colluvium or landslide debris are proposed,then provide additional laboratory test results (consolidation test results,etc.)to substantiate that the colluvium or landslide debris will be suitable for supporting certified fill and structures. 7. Recommend the additional Equivalent Fluid Pressures(EFP's)for the design of the proposed retaining walls(as shown on the plan)that may be subject to surcharge from the landside debris as necessary. Provide data and analyses to substantiate the additional EFP's recommended. 8. Also,provide foundation recommendations for the proposed retaining walls shown on the plans. 9. Address whether the proposed mitigation measures will incorporate the areas of the proposed access driveway as shown on the plans. If so,then show the recommended mitigation for the proposed driveway. if not,then provide additional recommendations with substantiating data and analyses as necessary. 10. Provide data on the possible adverse impact of the private sewage disposal system(s)relative to site stability and adjacent properties. (Based on the subsurface information provided in the 2/28/05 report,the depth of the landslide may be more than 50 feet). Discuss the path of migration of the effluent and whether ponding or daylighting of the effluent will occur. Stability calculations must consider the effect of ponding/perched groundwater. • 11. Show the following on the grading plans: a. Soldier pile plan and details(diameters,spacing,lengths, embedment depth, etc.). b. Approximate limits and depth of removal and recompaction of unsuitable soils under the proposed floor slab,per the soils engineer. c. Locations of dewatering wells,per the soils engineer. d. Location of subdrains as necessary. e. Location of private sewage disposal system(s). f. All recommended mitigation measures. 12. The Soils Engineer of record must review the grading plans and sign and stamp the plans in verification of his recommendations. Original manual signature and wet stamp are required. 13. Submit two sets of grading plans to the Soils Section for verification of compliance with County codes and policies. 14. Include a copy of this review sheet with your response. NOTE(S)TO THE PLAN CHECKER/BUILDING AND SAFETLENGINEER: ON-SITE SOILS ARE CORROSIVE TO FERROUS M E A HIGH EXPANSION POTENTIAL. r"Q9 OPa `�\f y� \• NO.2328 ! m Q EXP.G/30107 I ' Py pared by yT‘orect,NnP��Q Date 4/20/06 da cry=1 NOTICE: Public safety,relative to geotechnical subsurface exploration,shall be provided in accordance with current codes for excavations, inclusive of the Los Angeles County Code,Chapter 11.48,and the State of California,Title 8,Construction Safety Orders. Gan:appaloosa-3-gp • • DR. SHAHRAM FOZOONMEHR 28701 HIGHRIDGE ROAD ROLLING HILLS ESTATE, CALIFORNIA 90274 PRELIMINARY GEOTECHNICAL ENGINEERING AND ENGINEERING GEOLOGY INVESTIGATION FOR 3 APPALOOSA LANE ROLLING HILLS Prepared By SASSAN Geosciences, Inc. 1290 North Lake Avenue, Suite 204 Pasadena, California 91104-2869 March 16, 2006 • • SAS Sassan Geosciences,Inc. March 16, 2006 Dr. Shahram Fozoonmehr 28701 Highridge Road Rolling Hills Estate, CA 90274 Subject: Preliminary Geotechnical Engineering and Engineering Geology Investigation 3 Appaloosa Lane, Rolling Hills SAS File Number: 5F0Z091 Dear Dr. Fozoonmehr: SASSAN Geosciences, Inc. (SAS) has completed the preliminary geotechnical engineering and engineering geology investigations for the subject property. These exploratory investigations were performed to determine the nature of surface and subsurface soils and to evaluate their physical and engineering properties. The results were then analyzed, and recommendations for foundation design and related parameters were prepared. This report presents our findings and recommendations. 1290 North Lake Avenue.Suite 204.Pasadena.California 91104-2869 . (626)345-1819 . Fax(626)345-1820 . saseeoinc@aol.com • • LOCATION AND SITE DESCRIPTION The subject property is located on the west side of Appaloosa Lane in Rolling Hills, California. A vicinity map is presented on Figure A-1 in Appendix A. This property is comprised of a vacant lot that is mainly covered with an avocado grove. In general, the slope of the site is facing towards the northeast and the gradient ranges from gentle to steep. An ancient landslide underlies northern portion of the subject property. Several existing horse trails traverse through the subject property. The total relief within the subject property is approximately 240 feet and the approximate total height of the slopes within the close vicinity of the subject property is approximately 100 feet. OBJECTIVE The owner wishes to assess the geotechnical and geological characteristics of the underlying ground in order to construct a two-story single-family residence with a basement, a swimming pool, a stable, and a bowling alley at the subject property. FIELD INVESTIGATION Subsurface exploration was performed during a period from October 10th to November 7th, 2005 and involved drilling eight (8) boreholes to a maximum depth of approximately seventy(70) feet. The drilling operation was performed utilizing a twenty-four (24)-inch diameter bucket auger mounted on a drilling rig. Two and one-half-inch (2.5) diameter SAS SASSAN Geosciences,Inc. 5FOZ091 March 16,2006 Page 2 of 35 • split spoon ring samples were obtained from the boreholes. Earth materials encountered were classified in accordance with the visual-manual procedures of the Unified Soil Classification System. An oversized plot plan indicating the approximate borehole locations is presented on Figure A-2 in Appendix A. GEOLOGY Site Description The site is located on the west wall of Sepulveda Canyon, a "Blue Line" stream that drains northerly to the lowland area of the Los Angeles basin north of the Palos Verdes Hills. Total vertical relief within the property boundaries is on the order of 240 feet, ranging from an elevation of 740 feet at the north end of the property in the bottom of Sepulveda Canyon, to an elevation of 980 feet along the western margin of the property on the slope that ascends to Buggy Whip Lane and residences on the ridgeline west of the site. The slope angles range from 1.3:1 (horizontal:vertical) on the higher portions of the ridgeline west of the property, to 4:1 (horizontal:vertical) in the flatter central portion of the property where the residence is planned. Development on the property has been limited to a small wood shed to house agricultural equipment, dirt roads from Appaloosa Lane, that provide access to the avocado and citrus orchards that cover the entire site, and dirt equestrian trails. Previous grading has been limited to minor cuts and fills to construct the dirt roads and trails, and cuts and fills to construct Appaloosa Lane. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 3 of 35 • • Mature avocado trees of various kinds, as well as citrus trees, are present on the entire site, as well as a limited amount of native vegetation. Geologic Conditions The entire project site is underlain at depth by bedrock of the Monterey Formation, which in the site area is further subdivided as the lower part of the Altimira Shale (see Geologic Map on Figure A-2 in Appendix A). The lower Altimira Shale is characterized by light gray shale and mudstone with intervals of bentonitic tuff, as well as flows and/or intrusions of basalt (Dibblee, 1999). Bedding encountered in the bedrock conforms to published geologic maps and strikes northeasterly and dips at low to moderate inclinations to the northwest, a generally favorable condition for site slopes, which face easterly. Previous investigations by other consultants, as well as published geologic maps (Cleveland, 1976; Dibblee, 1999) have mapped a large ancient landslide underlying much of the northern portion of the site, including the proposed building site for a single family residence, barns, and roadways. Our subsurface investigation was aimed primarily at further refinement of the depth and lateral limits of the landslide to aide in the design of a method to stabilize the landslide, as well as to determine a site to conduct percolation testing. Our interpretation of the landslide geometry is depicted on the Geological Map presented on Figure A-2 and Cross-Sections presented on Figures A-3 and A-4 in Appendix A. Percolation testing was conducted by others, in an area outside the limits of the site landslide, and the results are/will be presented in a separate report. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 4 of 35 • • As shown on the Geotechnical Map and Cross-Sections, the landslide moved northeasterly into Sepulveda Canyon, based on the trend of groove directions on the basal rupture surface of the landslide, site topography, and the inclination of the basal rupture surface. The slide moved generally in an anti-dip, north easterly direction and consists of highly chaotic bedrock debris with generally discontinuous bedding and mixing with surficial materials (residual soil and/or colluvium). The extent of colluvial soils that have accumulated on the landslide surface generally average almost 20 feet in thickness, suggesting that the slide is old. EARTH MATERIALS Detailed logs of boreholes are presented on Figures B-1 through B-8 in Appendix B. GROUNDWATER Groundwater was not encountered in our borings within the landslide or in the area selected for percolation testing. DE-WATERING In order to reduce the likelihood of further slope failure occurrences, proper slope maintenance must be observed across the project site and surface runoff should be directed away from the area. Additionally a de-watering program should be considered with efforts focused along the entire eastern site boundary. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 5 of 35 • • A minimum of three (3) de-watering wells must be installed at locations designated on the plot plan presented on Figure A-2 in Appendix A. The wells are placed to effectively lower the perched water or water table (if any). Pumps must extract the water from the de- watering wells and direct it to a municipal storm water pipe(s). The de-watering wells must penetrate ten (10) feet beneath the slide plane; Qls/bedrock contact. In order to best utilize the water table/perched water level information; the exact location of the de-watering wells should only be determined after completion of the installation of soldier piles. Installation of the soldier piles would furnish tens of new shafts that will provide a better picture of the geometry of the perched water (if any) at the subject property. LABORATORY TESTING Moisture content (ASTM D 2216) and shear strength (ASTM D 3080) were determined for selected samples of soil considered to be representative of those encountered. The results of direct shear tests are presented on Figures B-9 through B-20 in Appendix B. Evaluation of the test data is reflected throughout this report. LIQUEFACTION The susceptibility of the site soils to liquefaction is mitigated due to the stiff, clayey and silty nature of the earth materials. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 6 of 35 • • ANALYSIS PROCEDURE The study of the subject slope and the associated slide has been divided into several segments. Portion of the subject property is underlain by an ancient landslide. As such, after performing a comprehensive field investigation, the geological map and several cross-sections have provided a three-dimensional picture of the failure plane. We understand that this failure plane is an indication of the lower boundary of an ancient slide. The topography of the pre-slide surface at the time of the failure is unknown. A conservative approach has been opted to manufacture the pre-slide surface. With the understanding of the geometry of the slide plane a back-calculation campaign initiates the study of the subject slope. It must be noted that the most conservative assumption regarding the water table was used in the back-calculation analyses. We assumed that at the time of ancient slide water was not present. This assumption would render the lowest pair of strength parameters. The backup analyses are presented in Appendix E of this report. Multiple sets of direct shear tests were performed on samples that were obtained from the boreholes at various depths. The result of these direct shear tests are presented in Appendix B of this report. In addition, the strength parameters that were obtained from the back-calculation are incorporated in the list. The background sets of strength parameters reported by the California Department of Mines and Geology(CDMG) are also included in the list to provide a more general picture of the overall strength parameters. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 7 of 35 • ! It is important to mention that the back-calculated pairs of strength parameters are the most relevant pairs for use in the analyses for the study of the failure plane. The laboratory test results are the most relevant pair for the slide mass. And a comparison between the background data from CDMG and laboratory test result can provide an appropriate pair for the underlying and undisturbed bedrock. This table is presented on page 10 of this report. After selection of representative pairs of strength parameters from the various sources of data, the study of the lateral design loads starts. The process of locating the proper spot for the soldier piles that would best furnish the required lateral support while keeping the overtopping problem in-check requires a close look on several geologic cross-sections, proposed finish grading surfaces, and the current City Codes. Introduction of the resisting media that would provide the necessary passive pressures to secure the movement of the slide mass by providing higher strength parameters and a favorable geology is crucial. The current codes require the earth media to possess a factor of safety in excess of 1.5 against sliding before it is considered suitable for housing the support elements such as soldier piles. The manipulation of the failure plane during the slope stability analysis can furnish such surface below which the factors of safety are in excess of 1.5. This task was accomplished via implementation of the above procedure. The backup analyses are presented in Appendix F of this report. All slopes between the rows of soldier piles will then be analyzed for the overtopping issue. Deep-seated slope stability analyses for all segments of slopes that are bound by at least one row of soldier piles will provide their factor of safety against the slope failure. Attempt is made to modify the location of the soldier piles to accomplish a minimum SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 8 of 35 • • factor of safety of 1.5 against overtopping. The backup analyses are presented in Appendix G of this report. During this process the locations of the soldier piles are finalized. Later changes in the finish grades, or revisions of the strength parameters would alter the lateral design values, as well as, the location of the soldier pile rows and their associated depths. When the locations of the soldier pile rows are established a comprehensive limit equilibrium analyses for several cross-sections that are broken down to several blocks commences. These analyses would render EFP on various rows and various segments of each row. The backup analyses are presented in Appendix H of this report. The passive resistance of the underlying undisturbed bedrock is calculated based on the geometry of the contact plane between the undisturbed bedrock and slide mass. The contact angles of 5 degrees, 12 degrees, and 25 degrees are used in the analyses. The backup analyses are presented in Appendix I of this report. A simple set of surficial slope stability analyses will follow the above study to secure the slopes against surficial and local failures. The backup analyses are presented in Appendix J of this report. STRENGTH PARAMETERS Sets of strength parameters were obtained from the laboratory direct shear test results, as well as, our back-calculation analyses. The entire list is presented in the following table: SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 9 of 35 Table No. 1 Strength Parameters Various Sources Depth y C 4) Borehole Sample Description (ft) (pcf) (psf) (deg) B-1 1 5 86 250 28 Residual/Colluvium/Surficial B-1 2 10 89 760 8 Residual/Colluvium B-1 3 15 92 870 21 Residual/Colluvium B-1 4 20 80 770 20 Residual/Colluvium B-1 5 25 71 600 24 Monterey fm/LS B-1 6 30 83 660 25 Monterey fm/LS B-1 10 50 74 670 30 Bedrock/Re-Sheared B-1 12 60 75 1,260 10 Bedrock B-2 1 5 86 310 38 Residual/Colluvium/Surficial B-2 2 10 80 420 17 Monterey fm/LS/Re-Sheared B-2 5 25 90 840 28 Monterey fm/LS B-2 6 30 90 660 25 Monterey fm/LS B-2 9 45 84 1,360 11 Bedrock B-2 10 50 74 2,380 12 Bedrock B-3 1 5 92 630 18 Residual/Colluvium B-3 2 10 93 540 32 Residual/Colluvium B-3 3 15 88 710 17 Residual/Colluvium B-3 4 20 76 920 12 Monterey fm/LS B-3 5 25 95 800 21 Monterey fm/LS B-3 6 30 92 650 29 Monterey fm/LS SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 10 of 35 • • Table No. 1 (Continues) Strength Parameters Various Sources Depth y C Borehole Sample Description (ft) (pcf) (psf) (deg) B-3 9 45 84 1,050 8 Bedrock B-3 11 55 92 760 25 Bedrock B-3 12 60 86 850 43 Bedrock B-4 2 10 90 560 21 Residual/Colluvium B-5 2 10 68 720 22 Monterey fm/LS B-5 3 15 88 530 23 Monterey fm/LS B-5 8 40 83 1,490 25 Monterey fm/LS B-6 2 10 93 910 12 Monterey fm/LS B-6 4 25 79 700 29 Monterey fm/LS B-6 5 30 92 660 33 Monterey fm/LS B-8 1 10 80 620 30 Bedrock/Re-Sheared B-8 2 20 125 740 32 Bedrock B-8 5 50 84 680 26 Bedrock/Re-Sheared CDMG - - - 570 18 Bedrock/Along Bedding Back - Cale. - - 301 14 Slide Plane Material SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 11 of 35 • • The following table presents the strength parameters used in our analyses. Table No. 2 Strength Parameters Used in Analyses Strength Parameters Bedrock Bedrock Slide Plane Material Type Slide Mass Cross-Bed Along-Bed Material Depth (ft) 10 10 Back-Calc Location Number B-1 CDMG B-2 Sect. E-E Internal Friction Angle 30 570 17 14 Cohesion (psi) 670 18 420 301 Total Unit Weight (pcf) 120 120 120 120 Saturated Unit Weight (pcf) 120 120 120 120 BACK-CALCULATION ANALYSIS To obtain the most conservative strength parameters for the existing slide plane material, we utilized STABL5, a computer program developed by Purdue University to handle general slope stability problems by the Simplified Janbu and the Modified Bishop method of slices. A series of back-calculation analyses were performed on Sections C-C and E-E, using an estimated pre-slide topography at a dry condition (no groundwater at the moment of failure). The most critical sections were selected for the analysis. The plan lines of the SAS SASSAN Geosciences,Inc. 5FOZ091 March 16,2006 Page 12 of 35 • • cross-sections are presented on Figure A-2 in Appendix A. Sections C-C and E-E used in back-calculation analyses are presented on Figures E-1 and E-2 in Appendix E. The following sets of strength parameters are resulted from our back-calculation effort: Table 3 Back-Calculations Section C-C C F.S. (degrees) (psf) 17 500 1.000 18 427 0.999 19 356 1.000 20 283 0.999 21 208 0.999 SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 13 of 35 • • Table 4 Back-Calculations Section E-E $ F.S. (degrees) (psf) 13 387 1.000 14 301 1.000 15 214 1.000 16 127 0.999 A copy of a set of back-calculation analyses for each of these cross-sections is presented in Appendix E. STABILITY OF UNDISTURBED BEDROCK The stability of the bedrock material underlying the slide mass was analyzed using STABL5, a computer program developed by Purdue University to handle general slope stability problems by the Simplified Janbu and the Modified Bishop method of slices. The most critical slopes were selected to analyze the stability of the bedrock material and to determine the location of the plane with a factor of safety of 1.5. The plan lines of these cross-sections are presented on Figure A-2 in Appendix A. Sections C-C and E-E used in stability analyses are presented on Figures F-1 and F-2 in Appendix F. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 14 of 35 0 • A series of deep-seated stability analyses and analyses of stability of the upper layers of bedrock were performed for sections C-C and E-E. The stability analyses for section C-C resulted in a minimum factor of safety of 1.928 for bedrock. The stability analyses for section E-E resulted in a minimum factor of safety of 1.830 for bedrock. The results of our analyses indicate that the undisturbed bedrock that underlies the slide mass possesses a factor of safety that is in excess of 1.5. The results of the stability analyses are presented in Appendix F. OVERTOPPING ANALYSIS The stability of the slide mass after the installation of the proposed soldier piles was analyzed using STABLS, a computer program developed by Purdue University to handle general slope stability problems by the Simplified Janbu and the Modified Bishop method of slices. The most critical slopes were selected to analyze the stability of the slide mass after the installation of the proposed soldier piles. The plan lines of these cross-sections are presented on Figure A-2 in Appendix A. Sections A-A, C-C, D-D and E-E used in • stability analyses are presented on Figures G-1 through G-4 in Appendix G. A series of deep-seated stability analyses were performed for sections A-A, C-C, D-D and E-E to determine the factors of safety of the slide mass for overtopping. The stability analyses for section A-A resulted in a minimum factor of safety of 1.521. The stability analyses for section C-C resulted in a minimum factor of safety of 1.512. The stability analyses for section D-D resulted in a minimum factor of safety of 1.537. The stability SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 15 of 35 • • analyses for section E-E resulted in a minimum factor of safety of 1.574. The results of the stability analyses are presented in Appendix G. EQUIVALENT FLUID PRESSURE ANALYSIS A series of limit equilibrium block analyses were performed for relevant cross-sections A- A, C-C, D-D and E-E to determine the values of the active earth pressures acting upon the proposed rows of soldier piles. The conservative strength parameters for the slide plane used in the equivalent fluid pressure (EFP) analyses are obtained from back-calculations. The plan lines of the cross-sections used in EFP analyses are presented on Geologic Map on Figure A-2 in Appendix A. Copies of the EFP analyses along with the associated cross-sections are presented in Appendix H. The recommended design values of active EFPs for various rows of the proposed soldier piles are summarized in Table 7 later in this report. Our Analyses considered the following variables: • Geometry of the active wedges, • Surface angle of bedrock contact (slide plane), • Cohesion of slide plane materials, • Internal friction angle of the slide plane materials, and • Highest anticipated water level. The results of the EFP analyses with associated cross-sections are presented in Appendix H. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 16 of 35 • ! PASSIVE EARTH PRESSURE ANALYSIS The passive resistance of the underlying undisturbed bedrock is calculated based on the shear strength of bedrock and the geometry of the contact plane between the undisturbed bedrock and slide mass. The contact angles of 25 degrees, 12 degrees, and 5 degrees are used in the analyses. A series of limit equilibrium block analyses were performed to determine the values of the lateral passive earth pressure supporting the proposed soldier piles via undisturbed underlying bedrock. The passive pressures are listed in the following table: Table No. 5 Passive Pressure Contact Angle Passive Pressure Maximum (degrees) (pcf) Pressure (psf) 5 1,400 14,000 12 1,300 13,000 25 1,000 10,000 The point of application of the passive pressure for pile rows A, B, and C is at two (2) feet below the bedrock contact. The point of application of the passive pressure for pile rows D, F, G, and H is at the bedrock contact. And the point of application of the passive pressure for pile row E is at five (5) feet below the bedrock contact. The backup analyses are presented in Appendix I of this report. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 17 of 35 • PRIVATE SEWAGE DISPOSAL SEEPAGE PITS The proposed seepage pits will be located away from the proposed residence and away from the ancient landslide area. Three 2'-diameter boreholes; B-8, P-1, and P-2 were drilled and tested for percolation. The cone of influence that encompasses the boundary of the effluent does not reach the slide mass and does not interfere with the proposed improvements. The proposed private sewage disposal system will not adversely affect the proposed improvements; neither will it affect the neighboring properties. The percolation tests are performed by an independent private firm and their report will be submitted to the Department separately. CONCLUSIONS AND RECOMMENDATIONS Statement 111 We find that the proposed construction will be safe from geotechnical engineering and engineering geology standpoints against hazards such as landslides, settlement, and slippage. Further, the proposed status of the building or grading, as known, will not adversely affect the stability of adjacent properties, provided that the recommendations herein are followed SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 18 of 35 • • General The referenced property is considered to be suitable for the proposed construction from a geotechnical engineering and engineering geology standpoint against hazards such as landslides, settlement, and slippage, provided that our recommendations are incorporated into the approved construction plans. Further, the proposed status of the building or grading, as known, will not adversely affect the stability of adjacent properties. The referenced property is considered to be suitable for the proposed construction from geotechnical engineering and engineering geology standpoints, provided that our recommendations are incorporated into the approved construction plans. The conclusions and recommendations presented here are based on our observations at the site during our visit, engineering judgment, and analysis of the soil samples obtained from the boreholes. Minor variations of subsurface conditions are common, and major variations are possible. General Grading Grading areas must be stripped of all vegetation, debris, and other deleterious material. All loose soil disturbed by the removal of trees and/or structures (if applicable) must be removed and recompacted. In addition, the civil plans indicate that the final finish elevation of the proposed pad is 845'. The pad must be provided with a gentle slope from south to northeast such that at the northeast edge of the pad the elevation of the pad (top of slope) is 840'. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 19 of 35 • • Temporary Excavations and Shoring Depending on the geometry of the proposed construction, shoring of earth materials may be required to protect lives and properties. If such a condition arises, this office can provide the necessary strength parameters needed in the design of shoring elements. We understand that the maximum depth of the temporary excavations is anticipated to be approximately up to ten (10) feet. Based on the integrity of the site earth materials, it is our opinion that the temporary excavations may be performed continuously in accordance with the following table: Table No. 6 Temporary Excavation Recommendations Maximum Maximum Depth of Cut Slope Ratio (ft) (H:V) 0-5 Vertical >5 1:1 The contractor may perform the excavation under continuous monitoring of a grading inspector who would ensure the quality of grading and presence of competent earth materials. The excavations may be left open for a temporary period of four(4) weeks. A grading inspector must be present when laborers are working within five (5) feet of the temporary cut area. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 20 of 35 • • FOUNDATION Lateral Support System The lateral support must consist of grade beam/soldier pile combination system. The following recommendations should be implemented. A side friction value of 750 psf in compression and 375 psf in tension may be utilized for the portion of the soldier piles that are penetrated into competent bedrock. The allowable side friction values may be increased by thirty(30) percent for momentary wind and seismic loads. The following minimums apply to the soldier piles: 1. Soldier piles must be founded at a minimum depth of twelve (12) feet into competent bedrock. The actual depth of soldier piles, however, must be determined by the structural engineer in conjunction with this office. 2. Soldier piles must have a minimum diameter of twenty-four (24) inches. 3. The excavations must not be left open overnight. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 21 of 35 • • 4. Active earth pressure increasing at rates listed in the following table must be used in calculations: Table No. 7 Active Earth Pressure for Lateral Support System EFP ROW (pcf) A 150 B 150 C 158 D 71 E 94 F 30 G 30 H 30 Copies of EFP analyses are presented in Appendix H. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 22 of 35 • • 5. Passive earth pressure increasing at rates listed in the following table must be used in calculations: Table No. 8 Passive Earth Pressure Recommendations ROW EFP Point of Application (pcf) Below Bedrock Contact (ft) A 1,000 2 B 1,000 2 C 1,000 2 D 1,300 0 E 1,400 5 F 1,400 0 G 1,400 0 H 1,400 0 The point of application of the passive pressure for pile rows A, B, and C is at two (2) feet below the bedrock contact. The point of application of the passive pressure for pile rows D, F, G, and H is at the bedrock contact. And the point of application of the passive pressure for pile row E is at five (5) feet below the bedrock contact. The backup analyses are presented in Appendix I of this report 6. The suggested passive pressure may not be doubled for an isolated pile condition. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 23 of 35 • • 7. A minimum daylight distance of forty(40) feet must be considered for all footings on or near descending slopes. Residence The proposed residence must be supported on a grade beam/friction pile combination footing unless the piles are a part of the soldier pile row. The following recommendations should be implemented. A side friction value of 750 psf in compression and 375 psf in tension may be utilized for the portion of the friction piles that are penetrated into competent bedrock. The allowable side friction values may be increased by thirty(30) percent for momentary wind and seismic loads. The following minimums apply to the friction piles: 1. Friction piles must be founded at a minimum depth of eight (8) feet into competent bedrock. The actual depth of friction piles, however, must be determined by the structural engineer in conjunction with this office. 2. Friction piles must have a minimum diameter of twenty-four(24) inches. 3. The excavations must not be left open overnight. 4. A minimum daylight distance of ten (10) feet must be considered for all footings on or near descending slopes. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 24 of 35 • • Stables The proposed stables must be supported by a grade-beam foundation system. The grade- beams must be connected in both directions in a rigid manner to provide a positive and negative moment support and to limit the differential settlements to a '/a of-one-inch. Grade-beams must be founded into the native/natural earth materials or into engineered fill. A bearing capacity of 1,000 psf must be used for footings eighteen (18) inches wide and founded twenty-four (24) inches into the native/natural earth materials. The allowable bearing value is for dead-plus-live loads and may be increased by thirty (30) percent for momentary wind and seismic loads. The following minimums apply to all footings: 1. Footings must be founded at a depth of twenty-four (24) inches into the native/natural earth materials or into engineered fill. 2. Footings must be reinforced with a minimum of four (4) #4 bars - two at the top and two at the bottom. The final design of the footings must be provided by a structural engineer in conjunction with this office. 3. A coefficient of friction of 0.3 must be utilized for resisting lateral loads at the contact surface of concrete and foundation soils. 4. Passive earth pressure increasing at the rate of 250 psf per foot of depth, to a maximum of 2,500 psf, must be used in calculations. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 25 of 35 • • Retaining Walls The maximum height of the proposed retaining walls is expected to be five (5) feet and they must be supported by continuous footings. Please understand that due to placement issues segments of the retaining walls will be supported on the proposed soldier piles. Footings of the retaining walls that are not placed atop the soldier piles must be founded into the native/natural earth materials. A bearing capacity of 1,000 psf must be used for footings thirty-six (36) inches wide and founded twenty-four (24) inches into the native/natural earth materials or into engineered fill. The allowable bearing capacity may be increased by twenty(20) percent for every additional foot of width or depth to a maximum value of 1,500 psf. The allowable bearing value is for dead-plus-live loads and may be increased by thirty (30) percent for momentary wind and seismic loads. The following minimums apply to all footings: 1. Footings must be founded at a depth of twenty-four(24) inches into native/natural earth materials or into engineered fill. 2. Footings must be reinforced with a minimum of four(4) #4 bars - two at the top and two at the bottom. The final design of the footings must be provided by a structural engineer in conjunction with this office. 3. A coefficient of friction of 0.3 must be utilized for resisting lateral loads at the contact surface of concrete and foundation soils. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 26 of 35 • • 4. Active earth pressure increasing at rates listed in the following table must be used in calculations: Table No. 9 Active Earth Pressure for Retaining Walls Slope of the Retained Backfill Active EFP (H:V) (pcf) Level 30 5:1 33 4:1 35 3:1 38 2:1 43 1'/2:1 55 1:1 80 5. Passive earth pressure increasing at the rate of 250 psf per foot of depth, to a maximum of 2,500 psf, must be used in calculations. Retaining walls must be provided with weep holes or perforated pipe and gravel sub-drain to prevent entrapment of water in the backfill. The perforated pipe must consist of four- inch (4") minimum diameter PVC Schedule 40, or ABS SDR-35, with a minimum of sixteen (16)perforations per foot on the bottom one-third of the pipe. Every foot of the pipe should be embedded in three (3) cubic feet of three-quarter-inch (3/4") gravel SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 27 of 35 i • wrapped in filter fabric (Mirafi 140N or equal). Placement of gravel and filter fabric is also required for weep holes. Freeboard A retaining wall surcharged by a sloping condition must be provided with a minimum twenty-four(24") high freeboard for slough protection. An open Vee Channel at the toe of the slope must be constructed behind the wall to carry off the slope water. Swimming Pool Recommendations The concrete shell of the pool must be designed as a freestanding structure. The shell of the pool must be supported on a grade-beam type foundation. A bearing capacity of 1,000 psf must be used for the proposed grade-beam foundation founded minimum twenty four (24) inches into the native/natural earth materials or engineered fill. The allowable bearing value is for dead-plus-live loads and may be increased by thirty (30) percent for momentary seismic loads. The following minimums apply to the lateral loading: 1. Water pressure increasing at the rate of 65 psf per foot of depth and acting upon the inner wall of the shell must be used in calculations. 2. Active earth pressure increasing at the rate of 65 psf per foot of depth and acting upon the outer wall of the shell must be used in calculations. 3. Passive earth pressure increasing at the rate of 250 psf per foot of depth, to a maximum of 2,500 psf, must be used in calculations. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 28 of 35 • 4. A coefficient of friction of 0.3 must be utilized for resisting lateral loads at the contact surface of concrete and foundation soils. 5. The swimming pool must be located at a minimum distance of seven (7) feet from the retaining walls, measured from inside face of the wall. The swimming pool must be provided with a subdrain system to prevent entrapment of water in the soil under and around the shell. The sub-drain system must consist of four- inch (4") minimum diameter perforated PVC pipe Schedule 40, or ABS SDR-35, with a minimum of sixteen (16) perforations per foot on the bottom one-third of the pipe. Every foot of the pipe should be embedded in one (1) cubic feet of three-quarter-inch (3/4") gravel wrapped in filter fabric (Mirafi 140N or equal). The sub-drain system must be installed under the pool shell in two perpendicular directions: along the pool under the center line, and across the pool passing under the deepest part of the shell. The collected water must drain via gravity. Seismic Parameters The seismic parameters for the design for the proposed construction based on the 1997 Uniform Building Code are presented in the following table: SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 29 of 35 • Table No. 10 Seismic Design Parameters Seismic Zone 4 Soil Profile Type SD Seismic Zone Factor, Z 0.4 Seismic Source Type B Closest Distance to Known Seismic Source 4 km Near Source Factor, Na 1.10 Near Source Factor, Nv 1.33 Seismic Coefficient, Ca 0.48 Seismic Coefficient, C„ 0.85 Conformance with the above listed criteria for seismic design does not constitute any kind of warranty, guarantee, or assurance that significant structural damage or ground failure will not occur if a maximum level earthquake occurs. The primary goal of seismic design is to protect life and limb, and to prevent catastrophic failures, and not to avoid all damage, since such design may be economically prohibitive. Seismic Hazard The subject property is shown on the "State of California Seismic Hazard Zones" map and is presented in Appendix C. The property is located within the seismically induced landslide hazards zone. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 30 of 35 • • Settlement Maximum total and differential settlements are expected to be less than one-half('/2) and one-quarter (1/4) inches, respectively, provided that our recommendations are followed. Engineered Fill All fill earth materials must consist of clean soil that is free of vegetation and other debris. The fill must be placed in six- (6-) to eight- (8-) inch thick lifts at near optimum moisture content and compacted. Particles larger than three (3) inches in diameter must not be allowed in the backfill material. Earth materials must not be imported to the site without prior approval by the soil engineer. All engineered fill must be compacted to a minimum of ninety (90) percent of its maximum dry density(ASTM D 1557). Where cohesionless soil having less than fifteen (15) percent finer than 0.005 millimeter is used for fill, it must be compacted to a minimum of ninety-five (95) percent of its maximum dry density. Neither jetting nor water tamping are permitted. Heavy construction equipment must be maintained at a minimum distance of three (3) feet from the existing structures. Hand-operated compaction equipment must be used to compact the backfill soils within this 3-foot-wide zone. Concrete Slabs The subgrade for the proposed concrete slabs-on-grade must consist of two (2)-foot-layer of ninety percent (90%) compacted fill. The subgrade must be covered with four(4) SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 31 of 35 inches of crushed miscellaneous aggregate (CMA) and compacted to ninety-five percent (95%) of its maximum dry density (ASTM D 1557). The CMA must be covered with one (1) inch of sand. The sand must be covered by a ten (10)-mil vapor barrier. The vapor barrier must be installed so that the edges of the sheet overlap at least twelve (12) inches onto any adjacent sheet. The vapor barrier must be covered with one (1) inch of sand. The sand must be covered with four (4) inches of non-expansive hard rock concrete mix (3/4" max. rock size). The reinforcement must be a minimum of#4 bars at eighteen (16) inches on center in both directions. The reinforcement must be placed at the mid-depth of the concrete slab. The slab must be covered with vapor barrier for at least two (2) days to slow the curing time, reduce the shrinkage crack potentials, and be self-watering. The consulting structural-engineer-of-record may decide to increase the slab thickness according to the proposed traffic loads. Driveway The subgrade for the proposed driveways must consist of two (2)-foot-layer of ninety percent (90%) compacted fill. The compacted subgrade fill must be covered with four (4) inches of crushed miscellaneous aggregate (CMA) and compacted to ninety-five percent (95%) of its maximum dry density (ASTM D 1557). The CMA must be covered by asphalt concrete, concrete slab, stone pavers or equal. Pipe Bedding and Trench Backfill The pipe bedding must consist of sand or similar granular material having a minimum sand equivalent value of thirty (30). The sand must be placed in a zone that extends a minimum of six (6) inches below and twelve (12) inches above the pipe for the full trench SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 32 of 35 r • width. The bedding material must be compacted. The trench backfill above the pipe bedding may consist of approved, on-site or imported soils, and it must be compacted. Where utility trenches are parallel to the footings, the bottom of the trench must be located above a plane with a slope of 1:1, projected downward from the adjacent bottom edge of the footing. Site Drainage Drainage devices such as sloping sidewalks and area drains must be provided around the building to collect and direct all water away from the structure. Neither rain nor excess irrigation water should be allowed to collect or pond against foundations. DESIGN REVIEW We suggest that the geotechnical and geological aspects of the project be reviewed by this firm during the design process. The scope of our services may include assistance to the design team by providing specific recommendations for special cases, reviewing the foundation design, reviewing the geotechnical and geological portions of the project for possible cost savings through alternative approaches, and evaluating the overall applicability of our recommendations. Additional site-specific explorations may also be considered if significant foundation modifications are required using the above recommendations. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 33 of 35 I • INSPECTION All excavations must be inspected and certified. All fill placed for engineering purposes must be tested for compaction and moisture content and certified. All drilled pile shafts must be inspected for the required embedment into competent bedrock and the presence of groundwater (if any) must be recorded. The consultant geologist-of-record must perform inspection of all drilled pile shafts. The subdrain system must be observed and approved. Inspection of excavations and subdrain system may also be required by the appropriate reviewing governmental agencies. It is recommended that SAS be retained to verify compliance with the recommendations made in this report, to ensure compliance with the design concepts, specifications, and recommendations, and to allow design changes in the event that exposed subsurface conditions differ from those anticipated herein. A joint meeting among the parties involved in this project is recommended prior to the start of groundbreaking to discuss specific procedures and scheduling. Inspections performed by SAS are for verification purposes only and shall under no circumstance relieve other parties involved in the design and construction from their obligation to perform work in accordance with the approved plans. In the event that the recommendations contained herein are interpreted by others, SAS will not accept responsibility for such interpretations. SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 34 of 35 I i INVESTIGATION LIMITATIONS This report has not been prepared for use by parties or projects other than those named and described above. It may not contain sufficient information for other parties or other purposes. The conclusions and recommendations presented in this report are professional opinions. These opinions have been derived in accordance with current standards of geotechnical engineering and engineering geology practice and field observations. No other warranty is expressed or implied. We appreciate the opportunity to be of service to you. If you have any questions, please call our office. Sincerely, SASSAN GEOSCIENCES, IN Ovof ESS/ok, p SAC 4% ei. ti R G w h No.2579 a m Exp.6-30-07 Sassan A. Salehipour, G. oiNteCHocro,. Thomas G. Hill, C.E.G President 'OFCAt.0" Senior Engineering Geologist SAS/TGH:sas/5foz091 b.doc Appendices SAS SASSAN Geosciences,Inc. 5F0Z091 March 16,2006 Page 35 of 35 I • List of References 1. Dibblee, T.W., Jr., 1999, Geologic Map of the Palos Verdes Peninsula and Vicinity. Dibblee Geological Foundation Maps # DF-70 Scale 1:24,000 2. Cleveland, G.B., 1976, Geology of the Northeast Part of the Palos Verdes Hills, Los Angeles County, California. Map Sheet 27. Scale 1:12,000 3. Hu Associates, Inc., February 2, 2004, Preliminary Soil and Geology Investigation Report 4. County of Los Angeles, May 11, 2004, Soils Engineering Review Sheet 5. Hu Associates, Inc., February 28, 2005, response to County of Los Angeles Geologic and Soils Engineering Review Sheets, Proposed Single Family Residence, 3 Appaloosa Lane, Rolling Hills, California, Project No. HA-4830-2 6. Environmental Geotechnology Laboratory, Inc., January 19,2004, Engineering Geologic Investigation, Proposed Single Family Residential Development, 3 Appaloosa Lane, Rolling Hills, California, EGL Project No 03-137-010G. • S List of Appendices Appendix A Maps and Cross-Sections Figure A-1 Vicinity Map Figure A-2 Geologic Map Figure A-3 Geologic Sections A-A, B-B, and C-C Figure A-4 Geologic Sections D-D and E-E Appendix B Bore Hole Logs and Laboratory Test Results Figures B-1 through B-8 Logs of Bore Holes Figures B-9 through B-20 Direct Shear Test Results Appendix C State of California Seismic Hazard Zones Map Figure C-1 Torrance Quadrangle Appendix D Regional Geology Map (Dibblee) Appendix E Back-Calculation Analyses Figure E-1 Section C-C Figure E-2 Section E-E Appendix F Stability Analyses; Search for Plane with F.S. of 1.5 Figure F-1 Section C-C Figure F-2 Section E-E Appendix G Overtopping Analyses Figure G-1 Section A-A Row G Figure G-2 Section C-C Rows A, B, C, and F Figure G-3 Section D-D Row H • • Figure G-4 Section E-E Rows A, B, C, and G Appendix H Equivalent Fluid Pressure Analyses Figure H-1 Section A-A Rows D and G Figure H-2 Section C-C Rows A, B, C, and F Figure H-3 Section D-D Rows E and H Figure H-4 Section E-E Rows A, B, C, and G Appendix I Passive Pressure Analyses Figure I-1 Pressure Distribution Diagram Figure I-2 Passive Pressure Analyses for Rows F, G, and H Figure 1-3 Passive Pressure Analyses for Row D Figure I-4 Passive Pressure Analyses for Rows A, B, C, and E Appendix J Surficial Slope Stability Analyses _ _ ____ _____ _ _ _ _ __ _ _ _ __ _ _ _____ - - - - - _ il • . , , , _ Revisions By __ _ _ _ - __ _ _ _ _ - - i , , , _ _ __ / c, z ,) ,----'-'-'''' ,,--_-_-----,..„--______ ,, ____,-------- 965 ___-----' _ - _____41.....04) '.1).) _ \------_____„ .,/-- _. --- - -, - „-----'''------/j/ /-:„.., "''''-:,----- :::-1.---- - ------ i 1,, /- c-Y-').2-'-, y X-N ' (C/ 25: -..-re -_______ -::-5- -/ / i -..•,, / / _ _ ______ __ /// <,",...J.-.•., -. /-"7" /''',/'-'- ,------'---- ,---c. „.„--- (C,-- ------ /' -'---____--.. —._ --- ... _ ,.., ___--------- - -960- _ ,,,_ ____--1955 -- ---- •< 1 -- ......... ./ 4 ...,.:-*-- -- -_,--_. ____--- __ __ ... _... _ ./ ------- -'5, , ---, - ... -_____ ,-----970— _„,--- ./C /-.., --- yi ,./1"L, ' ..,1-- -- 9''',.- k / 4,0.-- (i ,..- •s- -- - - - ----_____ _T ____ _ _ _____ _ 01--------,-_________________::, -II-- --... -----: 9: -_________ ___ .:.",/,//"< //,/:// //'''r, ,//` 11-'-&-L..., -"---;,„----- ---1,--:945--I:, ''' ...,,,,...; / I__--ri,,, ,,,,,c/r/,//7///,,9/ 8 6 X 4f,rr / /./"/ /-- ----------77: -\ „,"" / 7/7--,' / _/ , •7, ,„--"7//c-./ -- ..- 7/ _.----------- " ',I.-------- - ----- ...-- ----- 5---- __. ___-- - -995:-- I --1 ' - - ‘-...L_()""Lc.. .- "jj ,---, -„ __, 0 ///"- „ ,f,crcr. - '...), l•-••••-• 0---- A- X / -V - il.fr ti / 937 7 0 _______ ,/,--,„- ______,„--,- , - ---",.."-- '' t, ---.'-' „..---- ///' / / / „././ ,- ____4_,_ __- - 955 .,„//2)„„," 14 CO _ _ ___ POOL .--- __ _ ..„-- ,-- _ _ _ st\ ,,,,,,,, 2 \is\ \ ,,,,,,, \ , ,... /,,--/ - - ..... - / -- 7 / // //// /"' - - ,////,f /„.,',/,' .-, "/ //,,,,///// .1' / ---"'" - -'-- -')-1-, -- -- - .---- -- -- „ .„.//i,,/ ip., --- - " "ic./-",,,,,,,,,,.--- „,"„:„---; it_ --940--__....... , _1 , --- - -- .,, --- -- ...-- ,...• . ... / // / / /// / //,- - -,,,,,,// / //J f'/ // // i i / / / / / / " / / ,"'-.- // // 7;,...-/ "„ --- ......„ ,_ ___- __--- _.5.1;: ., : ,,_ ---_,---___, . -, ---- ----_----- -----_ ----95°------ -,5--,--- --- ,- _--- --a -- - .---- -- 9 .. -'s- X 937 2 0 ) \ I'l \\ ‘'' ,-. , ‘ % . ti,\ \ • \\\ , 1 ‘ , 11%, \ , N \\.,2%, 1 I -)-----)31„r, , ,, , , . . . , , .. \,,„ \ 1 f , ; i ''''>.:'''....‘..:1 ":...,,,..--'''" ,......._.....,...., .v.• I I "/ / /Is' .., ////://://1' / / ...,. ,..... 1 i i I t / / / ? .... //// // ,.'''' ././ ,''''' 3.," ........''''''T..' .....,...... „,......'' 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EARTH MATERIALS-NEAR ALL ROOF DRAINAGE TO BE CAPTURED r 1 • \�\sN r AND PIPED INTO THE DRAINAGE SYSTEM PROPOSED CONTOURS 4.4 i 8 CONC WALL ' -f 18 18I�' 8 $ -�''' '''� 12' OPTIMUM IS-TURE 1 2 �r2 0 12 x 8 MIN ROCK OR 4 x6 x12 2-0 x 8 MIN ROCK OR 4 x6 x12 11114 ' '/ /-�/ I 3-0'MINIMUM 2 0" - 144@ 18 OC 6 I - 'BUT EXISTING C + I 5% -- 1 i ' CONCRETE BLOCK BURIED 6 CONCRETE BLOCK BURIED 6 / ii, - r ALL DRAINAGE PIPE SHALL BE 6 EXISTING FENCE PAVED WIDTH 1 MINIMU BOTHWAv r 1 MOUND DIRT- �/0 MOUND DIRT- 1 ,�.. ,. ��®�l}RF CONSTFjllL'T10N SAND DIAMETER SCH 40 OR SDR 35 PVC '_ OVER PIPE MIN IN SLAB ONE ROCK PER 18 OVER PIPE SM/ti IN SLAB ONE ROCK PER 18 30 �. � SQINMAX � SQINMAX BY-WEIGHT AND 2% OF PIPE UNLESS SHOWN OTHERWISE RETAINING WALL _ ^- -6 TH CONCRETEW/344LONG BARS `� / /� \� �y - A .01, ------CEMENT BY-WEIGHT - --- _� r1 -_,_ _ _ 12 MIN I -- I - FLOWLiNE PER GRADING PLAN _ Y-„ ' EARTH BERM' ._�Y' = __ _ _ - �T �____- -�1= ===_ _ -- M �12 LIP OM �2 LIP _-- - ''.., - A`., " � \ - 0 DRAINAGE TERRACE DETAIL A/C2 ,__ - - -�=-"` MATCH EXISTING GRADE J Q /ti MATCH EXISTING GRADE Q /N\�y ^ h c L-�-'1- - - -II-I�=- c / / y .r Y Y; `i" _ r- G= ems=_ = I 2 48 CUTOFF DEEPEN 24 CUTOFF DEEPEN ?� ^y '� �I� CUT ,-3 CF/F OF} CRUSHED O O / /- 1 ' '._,�•-• -r- - �__ 20 SWALE ® RETAINING WALL DETAIL B/C2 f FINISHED GRADE ' r GRAVEL WRAPPED IN MIRAFI 140 N �� ,--AS REQUIRED TO �� 4r AS REQUIRED TO �� / '`yY �� biL-CLM N7 FILL (KEY BUTTRESS) 1 . ! _ OR EQUIVALENT PROTECT SLOPES PROTECT SLOPES KEYWAY ,4%-2 O REQUIRED ON GRADED CUT AND FILL SLOPES AT NO #4©18 1 #5 24 EA WAY O #4 24 EA WAY 3 ENERGY DISSIPATER PER DETAIL C/C2 PERFORATED SUB-DRAIN MORE THAN301NTERVALS ___ I 4 PLASTIC PERF PIPE @ -2 > @ �1,�\ / / r / y^ /. ✓ ?` „ ^� ,\ '' ,\�~'' ESTIMATED BEDR „ „ TERRACE SHALL HAVE LONGITUDINAL GRADE OFSi2� ' '•� 4@ 18 y� / / f ,,/,,n , ,, Y �> >'/ ®® 4O NDS 12"x12" CATCH BASIN SCH 40 PVC SIZE AND 12 D\ AND A MINIMUM DEPTH OFi AT THE FLOW UNE •46 \ • - 3 8 -' , 8 -' 6 - 1 6 8 - I ,fir• ^X> GU ` MIN SLOPE AS SHOWN S=1 0% MINIMUM THICKNESS OF 4 CONCRETE OR GUNIic 1 e • ' / 12 I // / : TYPICAL KEYWAY AIL ` O NDS 24"X24 CATCH BASIN WITH6-x6 10X10wELDEDIMREFABRIC _I— 8 I ii ;; 6. I �� a�"$�u L 0 G LIMIT OF GRADING 1 3 ® ' -- 1 -3 ---_-._I 7 -- 1, 6 I.,. / r M - / O SCALEEXISTING GRADE--'' H IN GRADE ------ / - emu-. / ;�^ O6 NDS 6" AREA DRAIN - �- - - -- - - -_ yl 8 - MATCH G G �' MATCH EXISTING GRAD J�'� aka® D ' / j ff rn�, O7 ENERGY DISSIPATER PER DETAIL D/C2 _ en DRAINAGE TERRACE DETAIL A RETAINING WALL & SWALE DETAIL B OUTLET STRUCTURE DETAIL9 Ur OUTLET STRUCTURE DETAIL / :6) / ,� /��' fl O INSTALL SUBDRAIN PER DETAIL E/C2 /NO SCALE NO SCALE VP NO SCALE NO SCALE / / / / � c- c O CONSTRUCT KEY AND BUTTRESS PER 4 SCH 40 PERFORATED PVC 1 8 \ X / `\ / ` SECTIONS SHEET C3 PLACE iN 3 CF/F OF 4 CRUSHED I k ` \ --- /--- / - - - - - - r - + -- 966® —_ -- GRAVEL WRAPPED IN MIRAFI 140 N-\-- ---emu: .u. -- - - - - - - I -I- - - - - ----- --- - \-/- _\_ \ El �� OR EQUIVALENT ` ?11m11P I \ �/ - -; - -� - 955 Ilidi / / / / z �® \ _ Q�1 ��, I VERDURA ' TERRACE 1 MIN EARTH BERM 2 �'1=!I I-' \ \ co �° r Els c\I /_ ( /� C7 BLOCK WALL = I I-III- ' -` ` - - - - irei I LONGITUDINAL I I �� \\ 0 \ / c a) -� - / / / l �- ��® % _ rr III __ GEO GRID = �_(OREQUIVALENT) i SLOPE@40%MIN - I - - -2%MIN __IIII a \ / ( - / / �� (NNONPERFORATED PIPE �� (TYPICAL) Y 1 v I 12/e MAX I I=1 � o iir� / �! DR ROBERT -I��RGE SCH �T� ' `��`� LATERAL TO SLOPE TO L� PIPE 1 'ABOVE BENCH WITH } �'_ � 7- 4-#4 1 i III i1�' \ ® > 1 ' / \ FACE AT 100 INTERVALS I - - - - ��V� I I i I I-�I!- - 6 MIN BRIDLE TRAIL \ I X e® / ® , - PERFORATIONS FACING DOWN MINIM CONTINUOUS-� 2 -III1 % / 1/l BUGPYWHIP DRIVE �` (2% MIN GRADIENT) 7 t�r, 4 ' -111{�1i�lil ) l E j �% /----- - ��- / - , - /� _ NOTEDPIPE OR OTHERWISE `Ilt 1� I - ��r, �� )- / I—J - ,l J c -CD r \ J 1 ' / LOT E , ,� - - Pol "A" _ ; - — - -- — — — — — j - 2 --- —— - —J —r — — T� > _ r / / Bedrock de =-9-5 er cs / / / o / p -p AS .a �iri , ' , { Q �'RACT 27 r24 N------ Point IIB11 � ._\ c -'-�Lid Y „ #4@ 24 r i J ti F / / /207 , Bed �k�ep #� er SAS I / , / a� / TERRACE DETAIL NEW BRIDLE TRAIT_ DETAIL / o 1n // S/O�` _ SUBDRAIN DETAIL ' / r /J NO SCALE ® NO SCALE ID NO SCALE 0) / / // -_ C_ c6 i / ii \\ , / / , C� PROPOSED DEBRIS ) 1124 C Z - M / / / ' -- - /��t O� e�� ■ WALL WITH 2 WEEP co W (B / / pe Gra — 9GGWHIPRIVE �ae - ��; �-HOLES @ 24 OC o ® _ M �_' '� / A / , fy BBC ash \ -- ®�� / RE BAR DETAIL PER X N _ f © Ili ' �d� „ STRUCTURAL ENGINEERl > ,,....0/ • / ` / / r / / r■..„. .i�.1\`\\ \ \� �`� `y , ®Q� ., ExiSTAyG —� /, ,...,..,,b ,wer , \ , . 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Elevation per Grading Plans F.F.-0.5' Slope 5% Min ( for 1st 10"-0 Proposed Residence 809 2•" / '/V:1 MI 111111•., 1E1 F.S. F.G. F.F. H.P. T.S. E.,(E)- C.B. 1.G. T.W. B.W. F.L. EXISTING CONTOUR PROPOSED CONTOUR AREA OF CUT AREA OF FILL GRADED BERM KEY SUBDRAIN DAYLIGHT LINE FINISHED SURFACE FINISHED GRADE FINISHED FLOOR HIGH POINT TOP OF SLOPE EXISTING CATCH BASIN TOP OF GRATE TOP OF WALL BOTTOM OF WALL FLOW LINE • .......... • . • ' . • • . • • • • • _ ...... . •• ••• . • ....... • . • . • • .. .... • .. • ' ......... • ' • ....... • .. . .. ... ... ... / .:' ......... ....................• z / • A'. ••• ../ / . . ... .... ............ i*.: / . .. • • v .soNz '''ci . .. ..........z. „Av ....4' ' A's ' , • • • • • • • • • Z. GX\•/-. . • . • • • • ...... • • ....... • 150 • • • • • • • • . • • 765 • • • • • • • • . iss • . • • • • • . • • . • • • . • . • . . . . • .. • . . . . . . . ......... zsv•oF..R•61 ..• • • Apptlivs91, Oled.04,3i4 S • 0 • • ;PLAN Ot••• ••• ••••• ...e..0..M...M...16•SS.i0t4... • 0 1 ....0•.... A . t . • • <P... • • • . • • . • • AUG 1 2 2008 CITY OF ROLLING HILLS t.1.17 0• DRAINAGE LEGEND 0 V; re:AZOV ... 6" DIA. DECK DRAIN 12" SQUARE NDS CATCH BASIN RIP RAP EROSION CONTROL, PER DETAIL SWALE FLOWLI E GRADING QUANTITIES CUT 9420 CUBIC YARDS FILL 9420 CUBIC YARDS CONSTRUCTION NOTES CONSTRUCT RETAINING WALL PER DETAIL 3, SHEET 1. RETAINING WALL TO BE CONSTRUCTED PER SEPARATE PLAN AND PERMIT. CONSTRUCT EARTH BERM PER DETAIL 2, SHEET 1. CONSTRUCT DOVVNDRAIN AND CONNECT TO PROPOSED 8"/12" DRAIN AS SHOWN. CONSTRUCT OUTFALL PER DETAIL 1, SHEET 1 OUTFALL THROUGH CURB TO DRIVEWAY cNi t-••• 0 By 0 o-) 6 00 c 10L (I) o E LiJ C O _LE cn O oE N 0 —• 0 C • L' 00 0 OcNct Date: July 29, 2008 Scale: 111=20 Drawn: DJB/DMM Checked: DJB Job No. 3005 Sheet Of 1 Sheets