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1 PHASE VII SUBSURFACE INVESTIGATION San Joaquin County Montgomery Ward Auto Service Center Public Health Services Department 5400 Pacific Avenue Stockton CA Site Code 2163 1 1.0 INTRODUCTION ' Environmental Audit Inc EAI was retained b Montgomery Ward & Co Incorporated (EAI) Y g rY � � (Montgomery Ward) to conduct a Phase VII Subsurface Investigation associated with the Montgomery Ward Auto Service Center located at 5400 Pacific Avenue, Stockton, California (see Figure 1) The proposed work was outlined in a Revised Phase VII Subsurface Investigation Work Plan dated October 17, 1995 and in an Addendum to Phase VII Subsurface ' Investigation Work Plan dated November 7, 1995 The Work Plan and Addendum were approved by the San Joaquin County Public Health Services Department (County) on October 23, 1995 and November 28, 1995, respectively The County identifies the Montgomery Ward ' site by Site Code 2163 All investigation work at the Montgomery Ward site has been conducted pursuant to and in accordance with County requests and requirements The scope of the Phase VII investigation consisted of the drilling and sampling of four ' hydropunches and the construction of one ground water monitoring well The purpose of the Phase VII investigation was to provide better data on the extent of dissolved hydrocarbons in ground water An off-site ground water well was proposed as part of the Phase VII investigation activities The well was to be located on public land west of existing well MW-4, on the west side of Pacific Avenue However, it was subsequently determined that fiber optic transcontinental telephone lines are located in this area Therefore, no drilling activities occurred in this off- site area 2.0 SUMMARY OF ]PREVIOUS WORK 21 WASTE OIL UST 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 (Canonie) 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 2.2 BULK OIL USTs 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 Canonie 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 I IProject No 1232 - 1 - ENVIRONMENTAL AUDIT, INC