2023-03-30_Spcl_Newsletter_Middleridge
CITY COUNCIL ALLOCATED NEARLY
$500K TO EXTEND THE USEFUL LIFE OF THE
MIDDLERIDGE LANE STORM DRAIN
The rainy season of 2021 and 2022 resulted in sinkholes in three locations along the Middleridge
storm drain, owned by the Los Angeles County, but maintained by the City of Rolling Hills via an
agreement between the two agencies executed in the 1970s.
In early 2023, more rain resulted in further sinkholes along the length of the aging pipe. Before
2023, the most recent repair was in September 2022. At that time, the City Council recognized
that these spot repairs would likely continue with time and more precipitation. In response, the
City Council commissioned a video of the entire length of the storm drainpipe for a wellness
check. Additionally, the City Council requested the expertise of the Los Angeles County Public
Works Department to provide engineering recommendations to appropriately maintain and
operate the system.
Video images showed that there is a system-wide pipe deterioration. Engineers with the Los
Angeles County Public Works Department recommended removing certain segments of the
pipe and replacing with new pipe.
The City Council prioritized the sinkholes that developed in early 2023, shared the video images
with the contractor EC Construction, and solicited the contractor’s recommendation for repair.
EC Construction was the contractor commissioned by the City to spot repair the drainage
system in 2022.
Before the successive rainstorms that followed the 2023 sinkholes, in EC Construction’s opinion,
the entire Middleridge storm drain can be lined (insert a pipe within a pipe). After the successive
rainstorms to date, EC Construction opined that certain spot repairs are necessary before pipe
lining can a viable option.
At the March 13, 2023 meeting, the City Council approved a contract for $451,000 to have EC
Construction spot repair where necessary, and line the entire pipe to extend the useful life of
the existing storm drain system.
EC Construction is currently ordering materials, scheduling work force and anticipates site work
commencing on Monday April 17, 2023. The project duration is approximately 30 working days.
Thank you in advance for your patience. The repair work will have traffic impacts, noise and
other inconveniences to the surrounding residents and travelers on Middleridge Lane North and
South. Please call City Hall at 310 377-1521 and ask for Executive Assistant to the City Manager
or via email chorvath@cityofrh.net with questions, concerns or suggestions regarding the
project.
SOUTH BAY
RAINWATER HARVESTING PROGRAM
Help California Tap the Rain by collecting rainwater to use in your garden. Most Californians use
half of their water outside, providing an opportunity to use free rainwater. One inch of rain falling
on a 1,000 square-foot roof can provide more than 600 gallons of water! Collecting rainwater
for use on your garden and patio decreases your water bill and helps conserve our precious
water resources! Visit southbaycities.org/south-bay-rainwater-harvesting for tips and guidance
on collecting and using rainwater at home.
ENVIRONMENTAL PROGRAMS
INFORMATION ON CITY WEBSITE
Visit the City's new Environmental Programs webpage, to discover opportunities and ideas for
how to participate in the City's efforts to protect the unique rural character of our community
and ensure our resiliency into the future. Information on solid waste management, water
pollution prevention, water conservation, sustainable gardening and landscaping, household
waste management, wildfire prevention, and septic system maintenance is provided.
Use the provided QR Code to access the web page: