AGENDA TITLE:
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Approve Plans and Specifications and Authorize Advertisement for Bids for Central Plume PCE/TCE Soil Remediation Project at 212 W. Pine St, Adopt a Resolution Authorizing City Manager to Award the Contract to the Lowest Responsive Bidder ($1,000,000) and Execute Change Orders ($100,000), and Appropriate Funds ($1,000,000) (PW)
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MEETING DATE:
July 2, 2025
PREPARED BY:
Public Works Director
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RECOMMENDED ACTION:
Approve plans and specifications and authorize advertisement for bids for Central Plume PCE/TCE Soil Vapor Remediation Project at 212 West Pine Street, adopt a resolution authorizing City Manager to award the contract to the lowest responsive bidder in an amount not to exceed $1,000,000, execute change orders in an amount not to exceed $100,000, and appropriate funds in the amount of $1,100,000.
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BACKGROUND INFORMATION:
For over 20 years, the City of Lodi has been involved in the remediation efforts associated with perchloroethylene (PCE) in the Central Plume Source Area (CPSA). The CPSA is generally bound by Pine Street on the North, Oak Street on the South, Church Street on the East, and Pleasant Street on the West. While the City did not cause the soil and groundwater contamination, the City agreed to assume all of the cleanup obligations as part of multiple lawsuit settlements.
The City has operated several PCE extraction projects in the Central Plume area, removing approximately 17,500 pounds of PCE to-date. In 2020, the City’s Soil Vapor Extraction (SVE) system was no longer effectively removing the PCE within the soil beneath the CPSA, and the State’s Water Board approved the removal of the SVE. As part of the approval to remove the SVE, the Water Board required the City to monitor indoor air quality for properties within the CPSA, and remediate any locations with residual PCE indoor air concentrations above the environmental screening levels (ESLs).
As part of the subsequent monitoring, the City found indoor air samples at 212 West Pine Street to be above the ESL. Through additional soil testing, there was determined to be a small source beneath the slab floor at 212 West Pine. After this determination, the City, Civil Hydro Tech (our Consultant), the Water Board, and the Pine Street Partners (the building owners) have met multiple times to determine the appropriate course of action.
On January 15, 2025, Council authorized the City Manager to reimburse the relocation costs for the businesses at 212 West Pine in order for the City to plan and complete this remediation project. Since that time, the owners have temporarily relocated and the City has developed a project scope that meets both the Water Board and the owners’ approval.
This project will remove approximately 7,100 square feet of concrete slab, remove approximately 200 cubic yards of PCE-contaminated soil, install a passive sub-slab depressurization system (SSDS), install a sub-slab vapor barrier, and replace the concrete slab within the building. Additionally, this project will include remediation outside of the building immediately to the south. These exterior improvements will consist of removal of concrete and asphalt, removing PCE-contaminated soil, replacing the sewer lateral, installing a vertical vapor barrier (a trench dam), and installing a temporary active treatment system.
Plans and specifications for the project are on file in the Public Works Department. The planned bid opening date is July 30, 2025
FISCAL IMPACT:
There will be a minimal amount of ongoing air monitoring costs necessary for approximately 12 months after construction as required by the Water Board prior to closing the Central Plume Source Area Cleanup and Abatement Order. These costs will be paid for out of the settlement’s PCE/TCE Rates Fund, and no General Funding will be needed on this project.
FUNDING AVAILABLE:
Appropriate Funds:
PCE/TCE Rates Fund (56599000.77020): $1,100,000