Laserfiche WebLink
1117 Lone Palm Avenue <br /> Suite B <br /> Modesto CA 95351 <br /> CC 209 579 2221 <br /> Fax 209 579 2225 <br /> 'A <br />. A S S O C I A T E S I N C <br /> January 31, 2000 <br /> 54 14885 0001L�' <br /> Ms Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Fourth Quarter 1999 Groundwater Monitoring Report for Three Palms Grocery, 6732 <br /> East Highway 88, Stockton, California, Site Code 1830 <br /> Dear Ms Oz <br /> This letter report summaries field activities conducted during the Fourth Quarter 1999 by ATC <br /> Associates Inc at the subject site (Figure 1) <br /> BACKGROUND <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 1 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 1989, <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 borings (SB 1 and <br /> SB2) to 86 5 feet below ground surface (bgs) to assess current subsurface conditions at the site <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from borings SB 1 <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 SB 1 and include total petroleum hydrocarbons as gasoline (TPHg) <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 greatest by soil <br /> samples from SBI at 45 5 feet bgs and SB2 at 55 5 feet bgs which contained only trace or <br /> w\14885Vvpor \4gtr1999 doe 1 <br />