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Site Background Information- Ripon Farm Service Page 4 of 9 TPH-d was detected in the MW-1, MW-2, and MW-3 samples at concentrations of 2,400 gg/l, 9,200 gg/l, and 6,900 gg/l, respectively • With the exception of one sample(B4-20),concentrations of TPH-d exceed concentrations ' of TPH-g in the soil samples In August 1995, five additional soil bonngs (B9 through B13) were advanced at the site Two borings were completed as ground water monitoring wells west and south of the previous three wells (MW-4 and MW-5) During drilling, ground water was encountered at a depth of approximately 20 feet bsg • TPH-g was detected in four soil samples at concentrations as high as 23 mg/kg TPH-d was detected in six soil samples at concentrations as high as 1,900 mg/kg Volatile aromatic hydrocarbons(benzene,toluene,ethylbenzene,and total xylenes BTEX)were not detected in any of the soil samples analyzed 1 • One grab ground water sample was collected from boring B13 located northeast of the former UST's Both TPH-g and TPH-d were detected in the grab water sample at concentrations of 6,500 gg/l and 450,000 gg/l, respectively BTEX compounds (benzene, ' • toluene, ethylbenzene, and xylenes)were not detected in these samples • With the exception of sample ASB 13/10,the concentrations ofTPH-d significantly exceeded ' concentrations of TPH-g in the soil samples analyzed Sample ASB13/10 contained 10 mg/kg TPH-g and less than detectable concentrations of TPH-d ' In October 1996, three soil probe borings (B 14 through B 16)were advanced on the Jimco Truck Stop located immediately north of the site, and one boring was advanced on the site(B17) During ' drilling, ground water was encountered at a depth of approximately 20 feet bsg • TPH-g and TPH-d were detected in three of eight soil samples analyzed at concentrations ' ranging from 14 mg/kg to 240 mg/kg and from 2 0 mg/kg to 1,700 mg/kg, respectively Toluene, ethylbenzene, and xylenes were detected in the same three samples at concentrations as high as 12 mg/kg(xylenes,B 15-10') Neither benzene nor methyl tertiary- butyl ether(MTBE)were detected in the soil samples analyzed • Grab ground water samples were collected from three bonngs(B 14,B 16,and B 17) TPH-g ' was detected in the grab ground water samples collected from B 14 and B 16 at concentrations of 2,400 µg/1 and 130 gg/l,respectively TPH-d was detected in all three grab ground water samples at concentrations ranging from 210 µg/1 to 5,400 gg/l Low concentrations of toluene,ethylbenzene,and xylenes were also detected in two of the three grab ground water samples Neither benzene nor MTBE were detected in the grab ground water samples • TPH-d concentrations exceeded TPH-g concentrations in three of the eight soil samples Advanced GeoEnvironmental,Inc. 1