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Andrew Richle - 2 - 18 March 2025 Also, at 18 South Pleasant Avenue (private resident), one indoor air sample and one ambient outdoor air sample will be collected using passive air samplers. Previous indoor air sampling at this location identified a concentration of PCE that slightly exceeded the residential San Francisco Bay Area Regional Water Quality Control Board environmental screening level (ESL) for indoor air. The City assumes the homeowner will provide the requested access to allow the 24-hour passive testing to be completed. The samples will be analyzed for VOCs using EPA Method TO-117. At the former Guild Dry cleaning facility (17 South Church Street), the City proposes to install one sub-slab Vapor Pin° beneath the concrete slab near the floor drain and sewer lateral within the building's interior. Additionally, one paired indoor air sample and an exterior ambient outdoor air sample will also be collected. The sub-slab soil vapor sample collection will follow a comparable procedure as used with the active soil vapor sample collection of 18 South Pleasant Avenue. The indoor and outdoor air sampling and analysis will follow the same procedure as outlined in the private residential air sampling and analysis. Also, as requested by Central Valley Water Board staff, the City proposes collecting an indoor air sample from the building at 11 South Church Street. The air inside this building was previously sampled and tested and had a PCE concentration which slightly exceeded the commercial ESL of 2.0 microgram/liter (fag/L). The building is presently used as a bakery/cafe and previous access requests have been denied by the owner. Sampling and analysis of the air at 11 South Church Street will follow the same procedures as described for the residential property. Central Valley Water Board staff concur with the City's proposed approach of sample collection and sample analyses. The City should conduct the investigations and submit an investigation summary report by 1 May 2025. Please copy Board staff on private property access requests and provide Board staff with 72- hours notification prior to anticipated fieldwork activities. If you have any questions regarding this letter or the requests therein, or would like to schedule a meeting to discuss , please contact Rob Fagerness by telephone at (916) 464- 4671 or by email at Robert.Fagernessra')waterboards.ca.gov. P�OFESS1 J 5.FAUA �f cA x 1 No.C59220 1 [ T Robert Fagerness, P.E. Water Resource Control Engineer �OFCA+�y Private Sites Cleanup Unit Kristin Digitally signed by Kristin OLOF Sato Shelton tTo Shelton Date:2025.03.18 ti 10:34:54-0700' A C74503 Kristi Shelton, P.E Senior Water Resource Control Engineer CAVIL Private Sites Cleanup Unit reop cc: Via electronic submittal Charles Swimley, City of Lodi Public Works Director, cswimley(cD-Iodi.gov Varinder Oberoi, PE, CHT, vsoberoi(aD-cht-water.net