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I A S S O C I A T E S I IN C Summary Report of ' Supplemental Subsurface Investigation Three Palms Grocery ' 6732 East Highway 88 Stockton, California ATC Project No 54 14885 0001 ' 1.0 INTRODUCTION ATC Associates Inc has prepared this letter report on behalf of Ms Lolly Bozzano, the property owner, to summarize findings of the supplemental subsurface investigation performed at the above referenced site (Figure 1) The purpose of the proposed work was to further evaluate the extent of reported petroleum hydrocarbon contamination in the vicinity of the former underground storage tanks (USTs) The findings of the subsurface investigative study are summarized in the following paragraphs 1.1 Site Location The site is located on the south side of Highway 88 (Waterloo Road) and on the east side of Fairchild Lane, Stockton, California, as shown on Figure 1 The site is presently occupied by ' Three Palms Grocery (a convenience store), a beauty salon, and an adjacent residence A domestic well, which provides water to the site, is located north of the residence (Figure 2) ' 1.2 Background Prior to July 1984, one 550-gallon waste oil UST, identified as Tank #4, was emptied of product, ' filled with sand, and capped with concrete In November 1986, one 1,000-gallon regular gasoline UST, identified as Tank #3, was removed and disposed of A soil sample collected during the removal of Tank 43 contained elevated concentrations of petroleum hydrocarbons In ' May 1989, one 1,000-gallon unleaded gasoline UST, identified as Tank #1 was filled with five cubic yards of concrete Currently, two other USTs remain in place and are in operation at the site These USTs are located approximately 40 feet east of the tanks which were closed in place On June 18, 1998, an ATC geologist supervised the advancement of two soil borings (SB 1 and SB2) to 86 5 feet below ground surface (bgs) to assess current subsurface conditions at the site Petroleum hydrocarbon constituents were detected in soil samples collected from borings SB 1 and S132 The highest reported constituent concentrations were observed in soil samples ' collected at 25 5 feet bgs in each of the borings The highest concentrations of petroleum w\I 48851reports\Suppl Invest doc 1 t