Groundwater Replenishment System final expansion plant 2 secondary effluent pipeline rehabilitation project

The existing 100 million gallons per day (mgd) Advanced Water Treatment Facility (AWTF) owned and operated by the District is to be expanded by 30 MGD to a total production capacity of 130 MGD. In order to provide enough influent to the AWTF to produce 130 MGD of product water, additional secondary effluent from the Orange County Sanitation District’s (OCSD) Plant 2 must be conveyed to the AWTF to supplement secondary effluent received from Plant 1. The work includes rehabilitation of approximately 15,700 feet of an existing 66-inch reinforced concrete pipe (RCP) pipeline. The existing 66-inch RCP pipeline is located on the west side of the Santa Ana River at/near the outside toe of the levee and extends from just south of Garfield Avenue to OCSD’s Plant 2 in Huntington Beach.

The work includes cleaning, CCTV, dewatering, and sliplining a portion of the 66-inch RCP pipeline with either high density polyethylene (HDPE) or fiberglass reinforced plastic (FRP) pipe; sliplining a portion of the 66-inch pipeline with steel, installation of insertion pits including shoring and if required dewatering; demolition of existing manways and boxes; installation of manways and vacuum relief valve assemblies; temporary support or relocation of existing utilities; installation of temporary closure pieces; installation of a cathodic protection system; protection of the existing 66, 84, and 120-inch pipelines; traffic control; site security, cathodic protection; and restoration of irrigation, rip rap , and vegetation removed for installation of the Work. The Work includes furnishing all labor, materials, tax, equipment, bonds, insurance, and services in strict compliance with the Contract Documents for a complete and operating pipeline.

Engineer’s Estimate:  $16-$18 Million

Documents: 

Questions for this scope of work should be directed to Sandy Scott-Roberts. To be added to the Plan Holders List, please contact Audrey Perry.

 

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