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11VV <br /> A S S O C I A T E S I N C <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Stagg High School <br />' 1621 Brookside Road <br /> Stockton, California <br /> ATC Project No. 17292.0002 <br />' 1.0 INTRODUCTION <br />' ATC Associates Inc. has prepared this report, on behalf of Stockton Unified School District <br /> (SUSD) to summarize findings of the additional subsurface investigation performed at Stagg <br /> High School, 1621 Brookside Road, Stockton, California (Figure 1). The purpose of the <br /> subsurface investigation was to evaluate whether or not petroleum hydrocarbons have migrated <br /> through soil and into groundwater. This work was performed at the request of San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/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 north side Brookside Avenue and the east side of McGaw Street, <br />' Stockton California, as shown on Figure 1. The location is primarily a residential area. Stagg <br /> High School currently occupies the site. <br />' 1.2 Background <br /> In December 1990, one 500-gallon unleaded gasoline underground storage tank (UST) and all <br />' associated piping and dispensing equipment was removed and disposed of. Laboratory analysis <br /> of a soil sample collected from beneath the former UST location indicated the presence of <br /> detectable concentrations total petroleum hydrocarbons. After the tank was removed, the area of <br />' the former tank was backfilled. <br /> On August 14 and 15, 1997, four soil borings to 25 feet below ground surface (bgs) were <br /> advanced. The soil borings were advanced using a truck mounted Geoprobe® narrow diameter <br /> rig employing direct push technology. Soil samples were submitted for analysis and samples <br />' from one boring, SB-1, contained detectable concentrations of toluene, ethylbenzene, and <br /> xylenes. A grab groundwater sample was also collected from boring SB-1 and contained <br /> detectable concentrations of TPHg and toluene, ethylbenzene, and xylenes. The samples from <br /> borings SB-2, SB-3, and SB-4 did not contain detectable concentrations of petroleum <br /> hydrocarbons. The results of the analysis are presented in Appendix A. <br /> w:1172921report,\,umwel.doc I <br />