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I ,Cvv:ATC A S S O C I A T E S I N C Closure Report ' Request for No Further Action Three Palms Grocery 6732 East Highway 88 Stockton, California ATC Project No 54 14885 0001 1 1 1.0 INTRODUC'T'ION ATC Associates Inc has completed the Closure Report — Request for No Further Action for the ' above referenced site The attached report summarizes our activities and findings Based on the sae's analytical results and site conditions ATC utilized the criteria listed in CRWQCB's No Further Action (NFA) requirements, as outlined by CRWQCB (Appendix B of the Tn-Regional 1 Recommendations), conditions at the subject site were evaluated The findings of the NFA evaluation 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 1 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 Backsiround ' 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 93, was removed and disposed of A soil sample collected during the removal of Tank #3 contained elevated concentrations of petroleum hydrocarbons In May I989, 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 I 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 SBI ' and SB2 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 constituents at this depth were observed in SBI and include TPHg (9,500 mg/kg), toluene (65 mg/kg), ethyl benzene (82 mg/kg), and xylenes (470 mg/kg) The petroleum hydrocarbons appear to attenuate rapidly with depth as indicated greatest by soil samples from SB I at 45 5 feet bgs and SB2 at 55 5 w A4885Veporls\NFA-Requestdoc 1