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
recommendation
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, & 1,2,3-TCP.
This project consists of furnishing and installing additional GAC filter vessels for additional treatment capacity at Well 6R, as well as a new GAC treatment system at Well 14, located at 1050 S. Stockton Street and 2206 Oxford Way respectively, as shown on Exhibit A and Exhibit B. The GAC filter system improvements at Well 6R and Well 14 will require a total of six low profile tanks, carbon media, concrete pad, all required on-site piping and valving, fencing adjustments, and other necessary site improvements including the removal of a maximum of 5 birch trees at Well 14. The existing birch trees are located immediately to the west of the existing well site enclosure and will need to be removed to expand the facility in a reasonable manner.
The plans and specifications are on file in the Public Works Department. The planned bid opening date is July 8, 2024. The project estimate is $3,100,000. The work is anticipated to be complete by summer 2025.
Staff recommends approving the plans and specifications and authorizing the advertisement of bids.
STRATEGIC VISION:
5C. Infrastructure: Address deferred maintenance.
FISCAL IMPACT:
The project will have a minimal impact on total maintenance costs but will enhance the safety, reliability and efficiency of the water system. This project does not impact the General Fund.
FUNDING AVAILABLE:
Funding will be identified at the project award.
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Charles E. Swimley
Public Works Director
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Melissa Munoz
Accounting Manager
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Andrew C. Keys
Interim City Manager