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Discrete Depth Soil&Soil Vapor Assessment Work Plan Page 3 CPSA,Lodi,California March 12,2025 SCOPE OF WORK Based on the results of the 2021 Post-Closure Indoor&Ambient Air sampling results in the CPSA, the 2023 and 2024 PSG sampling activities in the vicinity of the 18 S. Pleasant Ave. residence, and the comments from the Water Board in their February 9, 2024 Review of Soil Vapor Assessment Report, City of Lodi Central Plume Source Area letter, the City proposes to perform the following additional assessment activities— • Discrete depth soil and soil vapor sampling to further delineate the vertical extent of residual PCE in soil and soil vapor in the vicinity of the 18 S. Pleasant Ave. residence; • Sub-slab sampling with paired passive indoor air sampling to evaluate potential vapor intrusion at Guild Cleaners Inc (Guild), located at 17 South Church Street; and, • Indoor air sampling at 18 S. Pleasant Ave. and 11 S. Church St. to determine the current indoor air quality in the properties. PRE-FIELD ACTIVITIES Prior to performing the discrete depth soil and soil vapor, sub-slab, and indoor air sampling, CHT, on behalf of the City, will perform the following pre-field activities— • Obtain permission from building owners: The City will send a letter to the owners of the impacted properties seeking permission to perform assessment activities at their property. • Obtain an Encroachment Permit: CHT will obtain an encroachment permit from the City to install the soil vapor borings in the public right of way. • Obtain Boring Installation Permits: Obtain the necessary permits from the San Joaquin Department of Environmental Health (SJDEH). • Update Health and Safety Plan (HASP): The Site-specific Health and Safety Plan(HASP) will be updated in accordance with 29 CFR 1910.120 and Title 8 California Code of Regulations Section 5192 to address potential hazards at the Site during the proposed field activities. The HASP will be reviewed, signed, and adhered to by all onsite personnel including field staff, subcontractors, and Site visitors during the performance of the fieldwork. The HASP will include project objectives, assessments for potential hazards which may be encountered at the Site and associated with chemicals of potential concern (COPC), personal protective equipment and personnel monitoring, Site organization, and emergency contacts. The HASP will remain on-Site during all fieldwork. • Underground Utility Survey: Prior to initiating drilling activities, CHT will mark the soil vapor borehole and PSG sample locations in white paint and contact Underground Service Alert (USA) at least 72-hours prior to the start of fieldwork. Additionally, a private utility locator will also be retained to search for other on-Site subsurface utilities and/or obstructions that may or may not be marked by USA. 581 MONTEGO TERRACE,SUNNYVALE,CA 94089 TEL:415-424-3009