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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 g followin 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 ' Ethylbenzene and methyl tertiary-butyl ether(MTBE)were not analyzed in either of the soil samples collected In RI, 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 lieOn 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 B 1 and B2 at concentrations as high as 56,000 µg/1 and 600 µg/1 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 rig was utilized to advance pilot soil ' borings MW1 through MW4 to 25 feet below surface grade (bsg)using 8 25-inch diameter hollow- stem augers The drill rig 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 samples were collected from the pilot borings 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) in accordance with EPA Method 8015 Modified, and 1 Advanced GcoEnvironmentai,Inc I