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LA County Sanitation Districts outline multi‑phase trunk sewer rehabilitation in Hermosa Beach
Summary
County sanitation officials told the council the trunk line running through Hermosa Beach was built in 1920 and requires immediate cured‑in‑place pipe (CIPP) rehabilitation across roughly 8,000 ft in six phases, with daytime work, bypass pumping, traffic controls, and temporary service provisions for a small number of lateral‑impacted residences.
LA County Sanitation Districts staff presented a technical overview of a necessary rehabilitation of a 1920 concrete trunk sewer that runs through Hermosa Beach, describing the work as a cured‑in‑place pipe (CIPP) liner installation ("pipe‑within‑a‑pipe") to restore structural integrity without full replacement.
Construction overview: the district expects the work to be staged in six phases (phase one: 2nd–4th Street, tentative March 16–31; later phases extending into the following year). Each work zone is anticipated to run Monday–Friday, roughly 8 a.m.–4 p.m. (permit conditions permitting), with exclusion of holidays. CIPP installs will be staged in 200–500 foot spans. Where bypass piping is needed to maintain wastewater conveyance, some bypass lines will be above ground in medians and some will be trench‑installed under traffic plates through intersections. The contractor named is Sandcon; District inspectors and 24/7 district staff will be on call for emergencies.
Resident impacts and mitigation: staff said the district will provide door‑hanger notices (14 days, 7 days and 24 hours pre‑notification), temporary sanitary facilities when lateral service is disrupted, extensive signage and on‑site contacts, and efforts to minimize daytime lane and parking impacts. The district noted the work schedule was phased in recognition of the city’s local moratorium on some activities April 1–Sept 30 and has been planned to avoid summer peak impacts.
Questions and clarifications from council and attendees covered bypass pipe types (rigid HDPE; pumped when above ground), curing and inversion details for the liner, expected temporary lane closures and parking impacts, and how the district will coordinate traffic control and emergency access. Staff committed to ongoing community outreach and project webpages for updates.
Next steps: construction will commence after permits are issued and phasing and permit conditions are finalized; staff and district representatives will return with details if required by the council’s schedule.
