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® GAVIN NEWSOM <br /> cnvrRNnR <br /> CIA <br /> 5E N �RETAARY�FOR <br /> WaterBoards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 18 March 2025 <br /> Andrew Richle <br /> Utilities Superintendent <br /> City of Lodi <br /> 2001 W. Turner Road <br /> Lodi, CA 95242 <br /> Arichle(d lodi.gov <br /> REVIEW ADDITONAL SITE ASSESSMENT REPORT WORK PLAN, CENTRAL PLUME <br /> SOURCE AREA, LODI GROUNDWATER PLUMES SITE, LODI, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed <br /> the 12 March 2025 Discrete Depth Soil & Soil Vapor, and Indoor Air Assessment Work Plan (Work <br /> Plan) for the 18 South Pleasant Avenue, 17 South Church Street, and 11 South Church Street <br /> locations within the Central Plume Source Area (CPSA), Lodi, California. Civil Hydro Tech (CHT) <br /> submitted the Work Plan on behalf of the City of Lodi Public Works Department (City) for the Lodi <br /> Groundwater Plumes (Site). The City submitted the Work Plan in response to the 24 February 2025 <br /> Board staff letter. <br /> The Work Plan provides detail for additional sampling in three areas of the CPSA including: <br /> • Discrete depth soil and soil vapor sampling to further delineate the vertical extent of residual <br /> tetrachloroethylene (PCE) in soil and soil vapor near the vicinity of the residential home at <br /> 18 South Pleasant Avenue; <br /> • Sub-slab sampling with paired passive indoor air sampling to evaluate potential vapor <br /> intrusion at Guild Cleaners Inc (Guild), located at 17 South Church Street; and, <br /> • Indoor air sampling at 18 South Pleasant Avenue and 11 South Church Street to determine <br /> the current indoor air quality of these properties. <br /> At 18 South Pleasant Avenue (private residence), the City proposes collecting depth discrete soil <br /> and soil vapor samples from two boring locations at approximate depths of 5, 10, 15, and 25 feet <br /> below ground surface (bgs). Actual soil and soil vapor sample depths will be based on lithological <br /> data and field screening observations. Soil samples will be analyzed for volatile organic compounds <br /> (VOCs) using EPA Method 5035/8260B. Soil vapor samples will be collected with precleaned and <br /> evacuated 1-liter Suma canisters and will also be analyzed for VOCs using EPA Method TO-15. <br /> Helium is proposed as the leak-check gas and collected soil vapor samples will additionally be <br /> tested for helium using ASTM D-1946. <br /> NICHOLAS AVDIS, CHAIR I PATRICK PULUPA, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive,#200, Rancho Cordova,95670-6114 1 www.waterboards.ca.gov/centralvalley <br />