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CvvATC <br /> i ASSOCIATE S INC <br /> 'ROW 130 <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Eggiman Property <br /> 1112 East Harding Way F (/ <br /> Stockton, California <br /> ATC Project No 54 22493 0001 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this letter report, on behalf of Mr Robert Eggiman to <br /> summarize findings of the additional subsurface investigation activities performed at the Eggiman <br /> Property located at 1112 East Harding Way in Stockton, California (Figure 1) The purpose of <br /> the subsurface investigation was to evaluate the extent of petroleum hydrocarbon impacted soil <br /> and groundwater and evaluate the groundwater gradient beneath the site This work was done at <br /> the request of San Joaquin County Environmental Health Department (EHD) 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 site <br /> is currently occupied by 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 2 <br /> A soil sample was collected from the end of each tank at approximately 17 feet below ground <br /> surface Analytical testing indicated the collected samples contained detectable concentrations of <br /> petroleum hydrocarbon constituents The excavation was subsequently backfilled to the ground <br /> surface <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 feet below ground <br /> surface (bgs) Detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg), <br /> total petroleum hydrocarbons as diesel (TPHd), and benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) were observed in soil samples collected from the site The distribution of petroleum <br /> constituents beneath the site has been essentially defined and appears to be limited laterally to the <br /> immediate vicinity of the former tank pit The highest concentrations were reported between 10 <br /> 0' and 20 feet bgs and generally attenuate rapidly with depth Only low concentrations of toluene <br /> S lEnviromenta[1224931REPORTS\summ doe 1 <br />