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1 10 Site Background Information- Ripon Farm Service Page 4 of 8 1 of 2,400 µg/1 and 130 µg11,respectively. TPH-d was detected in all three grab ground water samples at concentrations ranging from 210 µg/1 to 5,400 µg/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. ' TP -d concentrations ations exceeded TPH-g concentrations in three of the eight soil samples analyzed, the remaining five soil samples did not contain detectable concentrations of either range of petroleum hydrocarbons. ' On 13 May 1998, five soil borings were drilled on-site (B18 and B19) and off-site (B20 through B22)with three off-site borings completed as ground water monitoring wells MW-6, MW-7, and MW-8; the two on-site borings were dual-completed as remediation pilot-test wells VW-1. and ' VW-2. Saturated soil conditions were encountered in all borings at a depth of approximately 17 feet bsg. • TPH-g was detected in two out of eleven analyzed soil samples collected from borings B 18 through B21, BTEX was detected in five of the samples. The greatest concentrations of TPH-g and TPH-d detected were 440 mg/kg and 1,400 mg/kg,respectively,encountered in 10 sample B 19-20. Toluene, ethylbenzene,and total xylenes were detected in the soil samples at concentrations as great as 8.6 mg/kg(xylenes).Oxygenated compounds were not detected in the soil samples analyzed. Volatile organic compounds (VOCs) were detected in soil samples collected at variable concentrations. • Soil samples collected from the Jimco Truck Stop at depths of 20 feet bsg were impacted with TPH-d at concentrations as high as 490 mg/kg, and xylenes at concentrations as high as 0.017 mg/kg. • Naphthalene was detected at a concentration of 2,600 micrograms per kilogram(µg/kg).The ' VOC encountered at the greatest concentration in the soil samples was 1,3,5- trimethylbenzene, which was detected at a concentration of 12,000 µg/kg. ' Quarterly monitoring events have been conducted at the site since the first ground water monitoring Q Y g wells were installed. The general results of the ground water monitoring events are as follows: ' • TPH- has been detected in ground water samples collected from wells MW-1 though MW-8 • g at concentrations as high as 14,000 µg/1.TPH-d has been detected at concentrations as high as 12,000 µg/1.TPH-g has been detected in ground water samples collected from soil vapor wells (VW-1 and VW-2) at concentrations of 12,000 µg/1 and 4,700 µg/1, respectively. ' • Benzene has been detected in the samples from wells MW-2,VW-1,and VW-2 at maximum concentrations of 1,400µg/l,2,000µg11,and 30µg/l,respectively.Toluene has been detected at a maximum concentration of 61 µg/1 in well VW-1.Ethylbenzene and xylenes have been ' Advanced GeoEnvironmental,Inc.