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' PHASE VI SUBSURFACE INVESTIGATION Site Code 2163 Montgomery Ward Auto Service Center 16 5400 Pacific Avenue Stockton CA ' 10 INTRODUCTION The San Joaquin County Public Health Services Department (County) requested in its letter ' dated September 9, 1994 that Montgomery Ward & Co , Incorporated (Montgomery Ward) conduct additional work to define the vertical and lateral extent of petroleum hydrocarbons in the soil and ground water on the property at 5400 Pacific Avenue, Stockton, California (see Figures 1 and 2) The scope of this additional work was outlined in Environmental Audit, Inc 's (EAI) Please VI subsurface investigation work plan (Work Plan) (see EAI, 1994B) Pursuant to a County letter dated December 20, 1994 regarding the Work PIan, supplemental information ' was submitted to the County on January 30, 1995 (see EAI, 1995A) As indicated in the County letter dated December 20, 1994, approval of the Work Plan was granted following submittal of this additional information ' The scope of the Phase VI investigation consisted of the drilling and sampling of four borings to a termination depth of approximately 68 feet below grade surface (bgs), converting the four borings to ground water monitoring wells, analytical testing of soil and ground water samples, ' and preparation of this report 2.0 SUMMARY OF PREVIOUS WORK 2.1 MONTGOMERY WARD SITE 2 1 1 WASTE OIL UST ' On August 28, 1986, one 550-gallon capacity waste oil UST was removed from the Montgomery Ward site (see Figure 2) One soil sample was collected from beneath the UST by Canome 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 ' 2 1 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, xylenes and ethylbenzene (BTEX) No TPH or BTEX were detected in any of the samples Based on these testing results, no additional assessment activities are required in this area of the Montgomery Ward site 2 1 3 GASOLINE USTs 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 County was reportedly on-site during USTs removals The Project No 1232 1 ENVIRONMENTAL AUDIT', INC