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• TPH-g was detected in ground water samples from MW-1, MW-2 and MW-3 at i concentrations of 1,700 micrograms per liter(µg/1), 14,000 gg/l and 2,600µg11,respectively. 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 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- was detected in four soil samples at concentrations as hi as 23 mg/kg. TPH-d was g p t� lig detected in six soil samples at concentrations as high as 1,900 mg/kg. Volatile aromatic ' hydrocarbons(benzene,toluene, ethyl benzene: BTEX)were not detected in any of the soil samples analyzed. ' •' One grab ground water sample was.collected from boring 1313 located northeast of the former USTs. 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 were not ' detected in these samples. ' With the exception of sample ASB13/10, the concentrations of TPH-d significantly exceeded concentrations ofTPH-gin the soil samples analyzed. Sample ASB13/10 contained 1.0 mglkg 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 ppm(xylenes,B15-10'). Neither benzene nor MTBE were detected in the soil samples analyzed. • Grab ground water samples were collected from three borings (B 14,B 16 and B 17). TPH-g ' was detected in the grab groundwater samples collected from B14 and B 16 at concentrations of 2,400 pg/land 130 gg/l, respectively. TPH-d was detected in all three grab ground water samples at concentrations ranging from 210 gg/l 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. 1 Advanced GeoEnvironmental,Inc. 1 I 1