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I ' Site Background Information Terminous Market Page 2 of 3 UNDERGROUND STORAGE TANK REMOVAL ' On 27 April 1988, two 550-gallon gasoline USTs were removed from the site by Mr Jacobs The approximate locations of the former USTs are shown on Figure 2 ' Immediately following the UST removal,two soil samples—one each from beneath the leaded and unleaded gasoline USTs and designated R1 and R2,respectively—were collected at a depth of 4 feet ' bsg and analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile aromatic compounds benzene, toluene, and total xylenes The soil sample collected from beneath the former leaded gasoline UST was also analyzed for ethylene dibromide (EDB) and total lead IEthylbenzene and methyl tertiary-butyl ether(MTBE)were not analyzed in either of the soil samples collected In Rl, TPH-g was detected at a concentration of 570 milligrams per kilogram (mg/kg), toluene was detected at a concentration of 84 mg/kg, and total xylenes were detected at a ' concentration of 250 mg/kg Benzene was not reported in either soil sample submitted for analysis PREVIOUS SUBSURFACE INVESTIGATIONS On 22 March 2000, four soil borings (B 1 through 134)were advanced by AGE at the site to assess the lateral and vertical extents of petroleum hydrocarbon-impacted soil and ground water TPH-g was detected in the soil sample collected from probe boring B2 at 10 feet bsg (132-10) at a concentration of 14 mg/kg No other analytes were detected at or above laboratory reporting limits in the soil samples collected TPH-g was detected in the grab ground water samples collected from B 1 and B2 at concentrations of 120,000 micrograms per liter (µg/1) and 15,000 µg/l, respectively Benzene, toluene, ethylbenzene, and total xylenes (BTEX) were also detected in the ground water samples collected from B1 and B2 at concentrations as high as 56,000µg/1 and 600 µg11 xylenes,respectively Table 1 of this appendix summarizes the analytical results of the March 2000 soil and grab ground water samples On 01 November 2004, a CME-75HT truck-mounted drill r was utilized to advance pilot soil g borings MW 1 through MW4 to 25 feet below surface grade(bsg)using 8 25-Inch diameter hollow- stem augers The drill ng and two-man crew were supplied by Mitchell Drilling Environmental of Rancho Cordova, California Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned, 2-inch by 6-inch brass sleeves The Isamples were collected from the pilot bonngs at 5-foot intervals, beginning at 5 feet bsg, using a 140-pound hammer to advance the sampler A total of sixteen soil samples were analyzed for • TPH-g and total petroleum hydrocarbons quantified as diesel(TPH-d) m accordance with EPA Method 8015 Modified, and Advanced GeoEnvironmental,Inc. I