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Stantec PHASE II ENVIRONMENTAL SITE ASSESSMENT REPORT 4.0 Conclusions and Recommendations 4.1 CONCLUSIONS Stantec was contracted by Calpine to conduct a Phase II ESA of the commercial property located at 1301 Lockeford Street in Lodi, California. This report documents the results of the soil vapor and subsurface assessment completed at the Site in support of Calpine's environmental due diligence. The Phase I ESA stated that the Site used PCE (a halogenated/chlorinated solvent) in their parts washer that was located in the southwest corner of the southern warehouse in the shop portion of the building. The use of PCE and other halogenated/chlorinated solvents are considered as significant environmental concerns because these solvents can easily penetrate through concrete and are environmentally persistent. PCE, when used as a cleaning agent in the parts washer, would likely have been applied in a diluted form with the wash water. The practice of using PCE as a cleaning agent is no longer used by Calpine. Analytical results from the soil sample SS-5 and the soil vapor sample SV-5 collected in the vicinity of the former parts washer were not detected above the laboratory MDL for PCE. Based on the results of the Phase II ESA, the following conclusions are noted: • Shallow soil vapor concentrations were screened against the CHHSLs commercial/ industrial soils and the RWQCB ESLs for commercial/industrial soils. No VOC analytical results were detected above their corresponding CHHSLs and ESLs in the 6 soil vapor samples analyzed except for PCE. PCE was detected above the CHHSL and ESL screening levels in the soil vapor sample SV-2, that was collected in the southwest corner of the northern warehouse. The concentrations of the remaining VOCs were observed approximately one order of magnitude below the screening levels. • Soil samples were collected from each soil vapor borehole during the hand augering of the boreholes. Selected soil samples from SS-1, SS-2, SS-5, and SS-6 were chosen for chemical analyses based on locations of suspected historical features/existing subsurface impacts, and the soil vapor analyses. The remainder of the soil samples were placed on hold pending the soil vapor analytical results. Based on the analytical results from the soil vapor samples, no additional soil samples were analyzed. • The soil samples SS-1, SS-5, and SS-6 were analyzed for TPH fuel fingerprint, VOCs, and the CAM 17 metals. Additionally, soil sample SS-2 was analyzed for VOCs only based on the soil vapor analyses that detected PCE. • VOC analytical results for soil samples SS-1, SS-2, SS-5, and SS-6 reported minor i:\projects\c 1pine\lodi\reportlodi.svrpt.dou 4.1