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. A S S O C t A T E 5 I N C <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Inland Paint Company <br /> 117 West Harding Way <br /> ' Stockton, California <br /> ATC Project No. 17295.0001 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. has prepared this report on behalf of Inland Paint Company to summarize <br /> p p Y <br /> the additional subsurface investigation activities performed at the above referenced site. This <br /> work was done at the request of San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) in phone conversation on December 6, 1999. 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 of Harding Way and the east side of Pacific Avenue in <br /> Stockton, California, as shown on Figure 1. The vicinity of the site is primarily a commercial <br /> and residential area. The site is currently occupied by Inland Paint Company. <br /> 1.2 Background <br /> ' In March 1990, one 1,000-gallon underground storage tank (UST) and all associated piping and <br /> dispensing equipment were removed and transported off-site. Laboratory analysis of soil <br /> samples collected from beneath the former 1,000-gallon UST location indicated the presence of <br /> detectable concentrations of ethylbenzene and xylenes. After the tank was removed, the area of <br /> excavation of the former tank was backfilled with backfill material provided by Stockton Service <br /> Station Equipment, <br /> On January 8, 1998, an ATC geologist supervised the advancement of one soil boring to 41.5 <br /> feet below ground surface (bgs). Soil samples were collected and submitted for analysis of total <br /> petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd) by EPA Method 8015; and <br /> 1 volatile organic compounds (VOCs) by EPA Method 8260. A Hydropunch groundwater sample <br /> was collected and analyzed for TPHg, TPHd, VOCs, and halogenated volatile organic <br /> compounds (HVOCs)by EPA Method 801018020. <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from boring SB I. <br /> The highest reported constituent concentrations were observed at 5.5 feet bgs and appeared to <br /> attenuate rapidly with depth. Trace amounts of petroleum hydrocarbon constituents were also <br /> w:1172951reportslsumiH.doc I <br />