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Soil Vapor Assessment Work Plan Page 4 CPSA,Lodi,California January 11,2023 • Obtain an Encroachment Permit: CHT will obtain an encroachment permit from the City to install the soil vapor borings and PSG samples in the public right of way. • Obtain Boring Installation Permits: Obtain the necessary permits from the San Joaquin Department of Environmental Health (SJDEH). • Prepare a Health and Safety Plan (HASP): A Site-specific Health and Safety Plan(HASP) will be prepared and utilized 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. 212 W. PINE STREET PROPERTY CHT, on behalf of the City, recommends the following approach for investigation of the extent of the residual PCE plume in soil vapor beneath and in the parking area behind the 212 W. Pine Street building— • Install temporary soil vapor (TSV) probes and perform discrete depth sampling along the sewer lateral emanating from the building to the main sewer lateral in the alleyway; • Install sub-slab sample probes at a maximum of six (6) locations beneath the slab in the building; and, • Collect six (6) indoor air samples in the building and one (1) ambient air sample from outside the building wall facing the alleyway DISCRETE DEPTH SOIL VAPOR SAMPLING CHT will perform discrete depth soil vapor sampling at locations SV-1 and SV-2 (Figure 4) to delineate the vertical extent of the PCE and TCE in soil vapor along the sewer lateral emanating from the building. The proposed soil vapor sampling locations would help us identify if the existing sewer lateral is acting as a continuing source for the residual PCE in soil. 649 DISTEL DRIVE,LOS ALTOS,CA 94022 TEL:415-424-3009