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VM E <br /> A S S O C I A T E S I N C <br /> Summary Report of <br /> Supplemental Subsurface Investigation <br /> Eggiman's Hydraulic Garage <br /> ' 1112 East Harding Way <br /> Stockton, California <br /> ATC Project No. 92054.0001 <br /> ' 1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this letter report, on behalf of Eggiman, Andrew and Edith <br /> ' Trust to summarize findings of the subsurface investigation performed at the above referenced <br /> site (Figure 1). The purpose of the supplemental subsurface investigation was to evaluate the <br /> vertical extent of residually impacted soil and groundwater at the subject site. This work was <br /> required by the San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) as described in their correspondence dated February 11, 2000. The findings of the <br /> subsurface investigative study are summarized in the following paragraphs. <br /> 1.1 Site Location <br /> ' The site is located on the south side of East Harding Way in Stockton, California, as shown on <br /> Figure 1. The property is located in a mixed residential, commercial, and industrial area. The <br /> ' site is currently occupied by Eggiman's Hydraulic Garage, a hydraulic repair facility. <br /> 1_2 Background <br /> ' In April 1987, SEMCO removed and disposed of two 1,000-gallon regular gasoline underground <br /> storage tanks (USTs), associated piping,and fuel dispenser from the locations shown on Figure <br /> 2. A soil sample was collected from the end of each tank at approximately 17 feet (ft.) below <br /> ground surface (bgs). Analytical testing indicated the collected samples contained detectable <br /> concentrations of petroleum hydrocarbon constituents. The excavation was subsequently <br /> backfilled to the ground surface. Soil sample results are summarized in Table 1. <br /> On July 24, 1997, to investigate the extent of residual soil contamination at the site, a total of six <br /> soil borings were advanced to depths ranging from approximately 16 to 31 ft. bgs. Detectable <br /> concentrations of total petroleum hydrocarbons as gasoline (TPHg), total petroleum <br /> hydrocarbons as diesel (TPHd), and benzene, toluene, ethylbenzene, and xylenes (BTEX) were <br /> observed in soil samples collected from the site. Analytical results suggested the distribution of <br /> • petroleum constituents beneath the site had been essentially defined and appeared to be limited <br /> laterally to the immediate vicinity of the former tank pit. The highest concentrations were <br /> w:192054.00011reportslsumsb7.doc I <br />