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SOIL VAPOR EXTRACTION PILOT SW WORK PLAN San Joaquin County Montgomery Ward Auto Service Center Public Health Services Department 5400 Pacific Avenue, Stockton CA Site Code 2163 1 APPENDIX A ' SUMMARY OF SITE ASSESSMENTS ' WASTE OIL UST REMOVAL (1986) On August 28, 1986, one 550-gallon capacity waste oil underground storage tank (UST) was removed from the Montgomery Ward site (see Figure 2) One soil sample was collected from beneath the UST by Canonie Environmental Services Corp (Canome) and tested for total petroleum hydrocarbons (TPH) using EPA Method 8015, purgeable aromatics using EPA Method 8020, purgeable halocarbons using EPA Method 8010, and polychlorinated biphenyls ' (PCBs) using EPA Method 8080 No TPH, purgeable aromatics or PCBs were detected in the sample Trichlorofluoromethane (0 05 parts per million [ppm]) was the only purgeable halocarbons detected Based on these testing results, no additional assessment activities are ' required in this area of the Montgomery Ward site BULK OIL UST REMOVALS (1988) On June 22, 1988, four bulk oil USTs (two 1,000-gallon and two 500-gallon capacity) were removed from the Montgomery Ward site (see Figure 2) Two soil samples were collected from beneath each UST by Canome and tested for TPH, and benzene, toluene, ethylbenzene and xylenes (BTEX) No TPH or BTEX were detected in any of the samples tested Based on these testing results, no additional assessment activities are required in this area of the Montgomery Ward site ' GASOLINE UST REMOVALS (1986) On June 26, 1986, two 10,000-gallon capacity gasoline USTs were removed from the ' Montgomery Ward site (see Figure 2) The USTs were used to store regular and unleaded gasoline A representative of the Sari Joaquin County Public Health Services Department (SJCPHSD) was reportedly on-site during USTs removal activities The underground product ' lines were triple rinsed, stubbed and abandoned in place A concrete slab on which the USTs were located was also abandoned in place The following summarizes the investigation activities completed to date at the Montgomery Ward site ' PHASE I INVESTIGATION (1988) In May 1988, A D Selditch & Associates, Inc (ADS) drilled and sampled five borings on the Montgomery Ward site to determine whether any release had occurred in the former USTS (SCC 1✓ 2.) Fou f tl,o 1%nrinrtc f}znrynrrc 1 th_rni4ah d) xvf-rP vrciniry or Lnc �'dSlJililG US1 J 1 JGG Figure GJ Four vt uta. VVAAaasia t.�.J....b. �� located in the former area of the gasoline USTs, and one boring (boring 5) was located in the ' west corner of the Montgomery Ward site to determine background soil conditions Borings 1 and 2, located at the southwest and southeast corners of the USTs, respectively, were drilled to a depth of 20 feet below ground surface (bgs) Borings 3 and 4 encountered auger refusal at 12 feet bgs, 1 e , the slab on which the USTs had been located was apparently encountered Detectable concentrations of TPH ranging from 8 to 38 ppm were encountered in only three of the samples tested (see Table 1) The detectable concentrations were all present in soil ' Project No 1232 A-1 ENVIRONMENTAL AUDIT, INC