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Site Background Information - Ripon Farm Service ' Page 3 of 8 ' hydrocarbons quantified as diesel(TPH-d)were detected in twelve samples at concentrations as high as 9,000 mg/kg. The maximum concentration of TPH-g was detected in sample B4-20;the maximum TPH-d was detected in sample B8-20. • TPH-g was detected in ground water samples from MW-1, MW-2, and MW-3 at concentrations of 1,700 micrograms per liter(µg/1), 14,000 4g11,and 2,600µg11,respectively. TPH-d was detected in the MW-1, MW-2, and MW-3 samples at concentrations of 2,400 µg/l, 9,200 µg11, and 6,900 µg11, 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 borings(B9 through B 13)were drilled 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. ' One grab ground water sample was collected from boring B13 located northeast of the former USTs. Both TPH-g and TPH-d were detected in the grab water sample at concentrations of 6,500 µg/1 and 450,000 Vg/l, respectively. BTEX compounds were not detected in these samples. With the exception of sample ASB 13110, the concentrations of TPH-d significantly exceeded ' concentrations of TPH-g in the soil samples analyzed. Sample ASB 13110 contained 1.0 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(B 17). 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 1.4 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 1.2 mg/kg (xylenes, B15-10'). Neither benzene nor MTBE were detected in the soil samples analyzed. ' Grabound water samples were co three borings B 14 �' p g ( , B 16,and B 17). TPH-g was detected in the grab ground water samples collected from B 14 and B 16 at concentrations Advanced GeoEnvironmental,Inc.