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Soil Vapor Assessment Work Plan Page 3 CPSA,Lodi,California January 11,2023 APPROACH As part of the CPSA GWET and SVE systems post-closure activities, the City had proposed to address any increased PCE concentrations during indoor air monitoring activities using targeted remediation. The City is not responsible for evaluating any indoor air impacts to the Guild Cleaners property as the City's responsibility only extended to the impact of releases from the sewer lateral along the alley way. Additionally, the City was informed by the owners of the 11 S. Church St. property and the 18 S. Pleasant Ave. residence that the City will no longer be granted access to their properties for any additional sampling. Prior to performing any targeted remediation, the City proposes to evaluate the extent of the residual PCE in the areas of impact by performing the following activities— 212 W. Pine Street— • Perform discrete depth soil vapor sampling along the sewer lateral emanating from the 212 W. Pine St. building to determine the horizontal and vertical extent of residual PCE, if any, in that area, and to determine if the sewer lateral may be an ongoing secondary source of the residual PCE; • Perform sub-slab investigation beneath the 212 W. Pine Street building to identify the extent of residual PCE in soil vapor beneath the building; and, • Perform indoor air sampling 18 S. Pleasant Avenue Residence— • Perform passive soil gas (PSG) sampling near the residence to determine if the PCE in indoor air is due to residual PCE that may be present in soil near the residence 210 W. Pine Street— • Perform indoor air sampling — Indoor air monitoring at this property will help the City ascertain the impact of residual PCE, if any, from the alleyway on the indoor air quality within the building If the results of the above investigations indicate the presence of residual PCE in soil vapor, the City will perform a feasibility evaluation of alternatives that can be applied to perform a targeted remediation of the impacted areas. PRE-FIELD ACTIVITIES Prior to performing the discrete depth soil vapor, PSG, 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 SVA activities at their property. 649 DISTEL DRIVE,LOS ALTOS,CA 94022 TEL:415-424-3009