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CIVIL UYIDUo TUCV Gw�G E�wir� Wader Re;~ce�/Dcwni4eri;4ng October 13, 2021 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 Sampling Work Plan Lodi Southern Plume, Lodi, California Dear Mr. Brattain: On behalf of the City of Lodi (City), Civil Hydro Tech (CHT) has prepared this Soil Vapor (SV) Sampling Work Plan (Work Plan) that identifies the locations and describes the methodology for collecting soil vapor samples at discrete depths within the Lodi Southern Plume(LSP)area located in Lodi, California. This Work Plan is in response to the July 21, 2021 Review of the Additional Passive Soil Gas Sampling Report, City of Lodi Southern Plume letter from the Central Valley Regional Water Quality Control Board (Water Board) to Andrew Richle of the City, where the Water Board reviewed the results of the passive gas sampling (PSG) events that were performed in the cul-de-sac on the southernmost tip of Sacramento Street in Lodi, California (Site), and recommended a further course of action. BACKGROUND The Site lies within the LSP, which is defined as the area bounded by Park Street to the north, Village and Maxwell Streets to the south, and by Stockton Street and School Street to the east and west, respectively (Figure 1). The Site area occupies a cul-de-sac on the southernmost tip of Sacramento Street in Lodi, California, and is comprised of seven land parcels located at the following addresses — 1320, 1324, 1325, 1328, 1332, 1339, and 1345 Sacramento Street (Figure 2). With the exception of the 1339 Sacramento Street parcel, which currently appears to be occupied by several trailers and recreational vehicles, Vanderlans & Sons owns the other six parcels where it manufactures the LANSAS line of pipe plugs. Additionally, the Site also is the location of a City of Lodi industrial pump station where waste collected from the Sacramento Street corridor industrial units is pumped to the City waste water treatment plant (WWTP). Previous investigations have indicated the presence of tetrachloroethylene(PCE)and other volatile organic compounds (VOCs) including trichloroethene (TCE) in the groundwater beneath the LSP area that may be a result of historical and current industrial activities that occurred along the Sacramento Street corridor. At present,the LSP area monitoring wells are monitored and sampled as part of the Water Board Order No. R5-2018-0800 that was issued on January 11, 2018. 175 N.EL MONTE AVENUE,LOS ALTOS,CA 94022 TEL:415-424-3009