Los Angeles County Sanitation Districts Questcdn #10354741

Retaining-wall ground improvement and rehabilitation of two plant outfalls

Los Angeles County Sanitation Districts is seeking construction bids for ground improvement and outfall rehabilitation at the Valencia Water Reclamation Plant. - Buyer: Los Angeles County Sanitation Districts; no sub-agency or specific office is identified. - Scope of work: - Improve the middle 1,200-foot section of the existing retaining wall using Cement Deep Soil Mixing (CDSM) walls and secant pile walls with ground anchors along the riverbank. - Rehabilitate two plant outfalls by demolishing and replacing concrete pipes, slip-lining one existing concrete pipe with FRP pipe, replacing a headwall, and installing riprap. - OEMs and vendors: No construction OEMs or project vendors are identified. QuestCDN is named as the bid-document and submission platform. - Notable requirements: Construction is planned for 556 working days after Notice to Proceed. The notice history identifies a mandatory jobsite walkthrough in the initial release. - Products and quantities: No discrete products, part numbers, or equipment quantities are specified; the outfall rehabilitation covers two outfalls.

Description

The project involves ground improvement along the existing 1,200-foot middle section of the retaining wall at the Valencia Water Reclamation Plant. Work includes constructing Cement Deep Soil Mixing walls and secant pile walls with ground anchors on the riverbank within the easement area. The project also includes rehabilitating two plant outfalls by replacing concrete pipes, slip-lining a pipe with a new FRP pipe, and replacing a headwall structure. Riprap will be installed near the southern end of the retaining wall; the required construction duration is 556 working days after the Notice to Proceed.

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