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Council awards $787,400 contract to replace corroded storm drain at Lampson/Knott
Summary
City staff recommended and the council approved a $787,400 contract to replace an aging 55‑foot corrugated metal pipe section on Lampson Avenue at Knott Street; staff said construction could begin in April and finish by June 2026 and will be funded from the capital improvement plan.
The Garden Grove City Council voted unanimously March 10 to award a construction contract to Duffy General Engineering for the Lampson Avenue and Knott Street storm drain improvements (City Project CP1414000).
Deputy Public Works Director Sam Kim described a 55‑linear‑foot segment of 48‑inch corrugated metal pipe (CMP) that has corroded after about 50–60 years of service; staff said the bottom of the pipe has deteriorated, causing progressive collapse and localized sinking of the roadway. The recommended project scope replaces the corroded CMP with reinforced concrete pipe, relocates a water main as needed and restores traffic striping and detection loops. Two bids were opened February 25; Duffy General Engineering submitted the lowest responsible bid at $787,400, which staff said is within the current project budget.
Councilmembers questioned whether groundwater conditions that increased costs on a prior nearby sewer project would affect this work and whether adjacent condominium drainage issues would be addressed. Kim said the storm drain repairs are expected to be shallower than the earlier sewer excavation; staff does not anticipate the same groundwater pumping issues and has coordinated with the condominium association on separate drainage concerns. Public Works staff also said they are reviewing the network for other older CMP segments and will program replacements through the storm‑drain CIP when identified.
Councilmember comments emphasized minimizing repeated digs in the same location and coordinating future work across utilities when possible. The council approved the contract (7–0). Staff estimated construction could begin in April 2026 with completion by June 2026 and said the project will be funded from the adopted capital improvement plan using SPA/CP funds and a current fiscal‑year budget adjustment due to project urgency.
The award authorizes construction to proceed with the low‑bid contractor; staff will return with final construction scheduling and neighborhood notification details.
