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t Site Background Information: Ripon Farm Service . Page 3 of 7 samples at concentrations as high as 3,800 milligrams per kilogram(mg/kg),.Total petroleum 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(µg11), 14,000µg11 and 2,600 gg/l,respectively. TPH-d was detected in the MW-1, MW-2 and MW-3 samples at concentrations of 2,400 ' µg11, 9,200 µg11 and 6,900 ggll, 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 B13)were drilled at the site. Two borings ' were completed as groundwater 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. R 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,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/l and 450,000 ggll, respectively. BTEX compounds were not detected in these samples. 1 With the exception of sample ASB13/10, the concentrations. of TPH-d significantly exceeded i concentrations of TPH-g in the soil samples analyzed. Sample ASB13/10 contained 1.0 mg/kg TPH-g and less than detectable concentrations of TPH-d. ' In October 1996, three soil probe borings (B14 through B16) were advanced at Jimco Truck Stop, located immediately north of the site and one boring was advanced on-site (B17•). During drilling, ground water was encountered at a depth of approximately 20 feet bsg. ' - were detected in three of eight sail samples analyzed at concentrations TPH-g and TPHd 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 ppm(xylenes,B15-10').Neither benzene nor MTBE were detected in the soil samples analyzed. ' Grab ground water samples were collected from three borings (B14, B16 and B17). TPH-g i ' Advanced GeoEnvironmental,Inc. 1