ARCHIVED REPORTS FINAL REPORT PHASE I_II ENVIRONMENTAL SITE ASSESSMENT

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' Winstm#120 Lodi,CA August 8,2002 ' 9.3.3 Sampling Location Selection The general intent of the investigation was to collect soil and groundwater samples to identify the potential presence of impacted media. Soil sample depth intervals selected for laboratory analysis were based upon the highest field screening results;or in the absence of significant organic vapors, ' the soil sample was collected from the interval directly above the groundwater saturated zone or from the terminus of the soil boring. 9.3.4 Laboratory Analysis The soil samples selected for laboratory analysis were containerized in laboratory supplied sample containers.The soil samples were labeled,stored on ice and transported under appropriate chain-of- custody procedures to Test America of Nashville,Tennessee. The collected soil samples from each hydraulic lift GeoProbe boring location were analyzed for the presence of TPH diesel range organics (DRO)and TPH oil range organics(ORO)by EPA Method 8015. ' 9.4 PHASE II RESULTS ' 9.4.1 Geology/Hydrogeology In general,subsurface geology consisted of Soil borings at the Site indicate the soils beneath the Site consist of sand and gravels from beneath the concrete baserock to approximately 2 feet below t ground surface(bgs),underlain by sand,silty sand,and sandy silt from 2 to 12 feet bgs(total depth). Field boring logs are included in Appendix E. Groundwater was not encountered during drilling activities. The boring location is presented on Figure 2. ' 9.4.2 Field Screening Results Continuous soil samples were collected and field screened for the presence of organic vapors using a ' PID equipped with a 10.2 eV lamp source. No PID readings above background were recorded. 9.4.3 Laboratory Results ' No constituents were detected above the method detection limit for the soil samples submitted to the analytical laboratory for analysis of TPH DRO/ORO. Refer to Appendix D for a complete analytical report. Analytical results Were compared to California regulatory criteria,where appropriate. No ' regulatory action levels currently exist for TPH concentrations in soils. Accordingly,to assess the potential impact of hydraulic fluid on environmental media, a TPH DRO concentration of 100 mg/kg is used as the target action level. 1 ' 0037 gy store 120 phase 2 reviewedl.doc SECOR International Incorporated 13