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CIVIL UYIDUC TUCV wa,�e- R e;~ce�/Pcwni4eri4ng January 11, 2023 SENT VIA: EMAIL Mr. Bill Brattain, PE Water Resource Control Engineer—Private Sites Cleanup Unit Central Valley Regional Water Quality Control Board 11010 Sun Center Drive, #200 Rancho Cordova, CA 95670 SUBJECT: Soil Vapor Assessment Work Plan Central Plume Source Area, Lodi, California Dear Mr. Brattain: On behalf of the City of Lodi (City), Civil Hydro Tech (CHT) has prepared this Soil Vapor Assessment (SVA) Work Plan (Work Plan) to evaluate the extent of residual tetrachloroethylene (PCE) in soil vapor within the Central Plume Source Area (CPSA) located in Lodi, California. This SVA is being performed in response to the detection of tetrachloroethylene (PCE) in indoor air at concentrations greater than the PCE indoor air Environmental Screening Level (ESL) in the 212 W. Pine St. and 18 S. Church St. properties, and the 18 S. Pleasant Ave. residence, following the closure, decommissioning and removal of the CPSA groundwater extraction and treatment (GWET) and soil vapor extraction(SVE) systems between April and July 2021. The Work Plan identifies the locations and describes the methodology for collecting discrete depth and sub-slab soil vapor, and indoor air samples at the 212 W. Pine St. property, indoor air samples at the 210 W. Pine St.property, and passive soil gas(PSG) samples outside the 18 S.Pleasant Ave. residence. The City is requesting the California Regional Water Quality Control Board, Central Valley Region(Water Board)to approve this Work Plan as part of the City's continuing efforts to mitigate areas of impacts within the CPSA. BACKGROUND The CPSA (Site) is defined as the area bounded by Pine Street, Church Street, Lodi Avenue, and Pleasant Avenue to the north, east, south, and west, respectively (Figures 1 and 2). The CPSA is within the larger footprint of the Lodi Central Plume Area(LCPA)which is bounded by Elm Street to the north, Kettleman Lane to the south, Cherokee Lane to the east and Hutchins Street to the west. Previous investigations have indicated the presence of PCE and other volatile organic compounds (VOCs) in the soil, soil vapor, indoor air, and groundwater beneath the CPSA. The City operated the CPSA GWET and SVE systems from 2011 through 2019 in the parking lot behind Guild Cleaners at 17 South Church Street, Lodi to treat, remove, and mitigate PCE and related VOCs that were released into the soil and groundwater beneath the CPSA during former historic operations of dry cleaners and a printing press. Operation of the CPSA GWET and SVE systems resulted in a significant reduction in PCE and other VOC concentrations in the subsurface soil, soil vapor, and groundwater beneath the CPSA. 649 DISTEL DRIVE,LOS ALTOS,CA 94022 TEL:415-424-3009