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--- —, 1117 Lone Palm Suite B <br /> v I Modesto California 95351 <br /> wwwatc-enviro corn <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S i N C <br /> DxVU, <br /> December 26, 2000 DEC% 7 ZQ01 <br /> 54 14885 0001 <br /> LWRONtw�N"T AL SERVIC ALT <br /> Ms Margaret Lagono PERM <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor j <br /> Stockton, California 95202 <br /> Subject Fourth Quarter 2001 Groundwater Monitoring Report for Three Palms Grocery, 6732 <br /> East Highway 88, Stockton, California, Site Code 1830 <br /> Dear Ms Lagono <br /> This letter report summarizes field activities conducted during the Fourth Quarter 2001 by ATC <br /> Associates Inc at the subject site (Figure 1) <br /> BACKGROUND <br /> f <br /> The site is located on the south side of Highway 88 (Waterloo Road) and on the east side of <br /> Fairchild Lane, Stockton, California, as shown on Figure i The site is presently occupied by <br /> Three Palms Grocery (a convenience store), a beauty salon, and an adjacent residence A <br /> domestic well, which provides water to the site, is located north of the residence (Figure 2) <br /> Prior to July 1984, one 550-gallon waste oil UST, identified as Tank #4, was emptied of product, <br /> filled with sand, and capped with concrete In November 1986, one 1,000-gallon regular gasoline <br /> UST, identified as Tank #3, was removed and disposed of A soil sample collected during the <br /> removal of Tank #3 contained elevated concentrations of petroleum hydrocarbons In May 1:'39, <br /> one 1,000-gallon unleaded gasoline UST, identified as Tank #1 was filled with five cubic yards of <br /> concrete Currently, two other USTs remain in place and are in operation at the site These <br /> USTs are located approximately 40 feet east of the tanks which were closed in place <br /> On June 18, 1998, an ATC geologist supervised the advancement of two soil bo .ags ;SB IL a-ld <br /> SB2) to 86 5 feet below ground surface (bgs) to assess current subsurface cone-Ions -t t.se site <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from borings SBI <br /> and SB2 The highest reported constituent concentrations were observed in soil samples collected <br /> at 25 5 feet bgs in each of the borings The highest concentrations of petroleum constituents at <br /> this depth were observed in SBI and include total petroleum hydrocarbons as gasoline (TF'1g) <br /> (9,500 mg/kg), toluene (65 mg/kg), ethyl benzene (82 mg/kg), and xylenes (470 mg/kg) The <br /> petroleum hydrocarbons appear to attenuate rapidly with depth as indicated l--eatest by soil <br /> samples from SBI at 45 5 feet bgs and SB2 at 55 5 feet bgs which contain-.' only tr,,ce or <br /> nondetectable concentrations of petroleum hydrocarbons Total lead was detected at 5 5 r:;/kg <br /> wA48gslrepor(s\4gtr2ooi aoc 1 <br />