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ASSOCIATES I N C . <br /> Summary Report of <br /> ' Additional Subsurface Investigation <br /> Eggiman Property <br /> 1112 East Harding Way <br /> ' Stockton, California <br /> ATC Project No. 54.92054.0001 <br /> 1.0 INTRODUCTION <br /> 1 <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 investigati6n 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 Public Health Services, Environmental Health Division <br /> (PHS/EHD). The findings of the subsurface investigative study are summarized in the following <br /> paragraphs. <br /> 1.1 Site Location <br /> ' The site is located on the south side of East Hardin Way in Stockton as shown on <br /> Harding Y California, <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 Backaround <br /> ' In April 1987 SEMCO removed and disposed of1,000-gallon <br /> p tw p o 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 /> w:192054.000I\repoM\sumii.doc 1 <br /> 1 <br />