AGENDA TITLE:
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Approve Plans and Specifications and Authorize Advertisement for Bids for Well 6R and Well 14 GAC System Improvements (PW)
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MEETING DATE:
June 5, 2024
PREPARED BY:
Public Works Director
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RECOMMENDED ACTION:
Approve Plans and Specifications and Authorize Advertisement for Bids for Well 6R and Well 14 GAC System Improvements.
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BACKGROUND INFORMATION:
The United States Environmental Protection Agency ("EPA") has established maximum contaminant levels for Per- and polyfluoroalkyl substances ("PFAS") and Perfluorooctane Sulfonic Acid ("PFOS") constituents. It is anticipated the State of California will adopt the EPA's limits as legally enforceable maximums. 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 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 Granular Activated Carbon ("GAC") adsorbers, of which Well 6R currently has two.
For decades, GAC has been utilized at several well sites within the City to adsorb DBCP, as well as other, potentially harmful constituents. The EPA has also identified GAC as an effective technology for removing the recently discovered constituents of interest, PFAS, PFOS, ...
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