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� v . <br /> 0 <br /> A S S O C I A T E S I N C <br />' Summary Report of <br /> Supplemental 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 supplemental subsurface investigation performed at Stagg <br /> High School, 1621 Brookside Road, Stockton, California (Figure 1). The purpose of the <br />' supplemental subsurface investigation was to evaluate the vertical and horizontal extent of <br /> petroleum impacted soil and groundwater in the vicinity of the former underground storage tank <br /> (UST). This work was performed at the request of San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD). The findings of the supplemental subsurface <br /> investigative study are summarized in the following paragraphs_ <br />' 1_1 Site Location <br /> The site is located on the north side Brookside Road 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 UST and all associated piping and <br /> dispensing equipment was removed and disposed of. Laboratory analysis of a soil sample <br /> collected from beneath the former UST location indicated the presence of detectable <br />' concentrations total petroleum hydrocarbons. After the tank was removed, the area of the former <br /> 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 from <br />' one boring, SB-1, contained detectable concentrations of toluene, ethylbenzene, and xylenes. A <br /> . grab groundwater sample was also collected from boring SB-1 and contained detectable <br /> concentrations of TPHg and toluene, ethylbenzene, and xylenes. The samples from borings SB-2, <br />' SB-3, and SB-4 did not contain detectable concentrations of petroleum hydrocarbons. The <br /> results of the analysis are presented in Appendix A. <br /> w:1172921repotts\Sup_subsurf invest.doc 1 <br /> 1 <br />