AGENDA TITLE:
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Adopt a Resolution Awarding Contract for the Well 6R and Well 14 GAC System Improvements, to Conco-West, Inc. DBA Conco West, Inc., of Manteca, California, ($3,361,200), Authorizing City Manager, or their Designee, to Execute Change Orders ($300,000) And Appropriating Funds ($3,661,200) (PW)
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MEETING DATE:
July 2, 2025
PREPARED BY:
Public Works Director
recommendation
RECOMMENDED ACTION:
Adopt a Resolution Awarding Contract for the Well 6R and Well 14 GAC System Improvements, to Conco-West, Inc. DBA Conco West, Inc., of Manteca California, in the amount of $3,361,200, authorizing City Manager, or their designee, to execute change orders in an amount not to exceed $300,000.
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BACKGROUND INFORMATION:
The Environmental Protection Agency (EPA) has established maximum contaminant levels for PFAS/PFOS constituents. It is anticipated the State of California will adopt the EPA's limits as legally enforceable maximums. Per- and Polyfluoroalkyl Substances (PFAS) contaminants have been detected in small amounts at Well 14. This project will address the treatment requirements for PFAS prior to the federal compliance date of 2029. Without this project, Well 14 may experience an exceedance of the maximum limits that would result in it becoming inoperable.
In addition to the treatment installation at Well 14 to address PFAS/ PFOS, Well 6R is in need of additional treatment capacity. Well 6R's existing granular activated carbon (GAC) installation was initially configured to remove dibromochloropropane (DBCP), a contaminant found at multiple sites in Lodi. In 2018, the State Water Resources Control Board, who regulates water systems in California, set a maximum contaminant limit for another compound, 1,2,3- Trichloropropane (1,2,3-TCP). This compound has been detected at Well 6R, as well as other sites in Lodi, and the recommended treatment for that contaminant requires a total of four GAC adsorbers, of which Well 6R currently has ...
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