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LEVI N E•FRICKE compounds 4 , 4-DDT (0. 14 ppm) , 2,4-DDT (0.'1036 ppm) , 4, 4 DDE (0.023) and 4 ,4-DDD (0.021) were detected in Q-6. The sums of the DDT-related compounds in these samples (0{. 026 and 0. 22) are considerably below the TTLC. DDT and related: compounds were not detected in any of the other four samples. submitted for analysis (Q-4, Q-7, Q-10, Q--11) . With the exception of Q-3, Dieldrin was not detected in any of the soil samples analyzed. The above results indicate that the soil ;l'in the vicinity of the h� Quonset but affected by concentrations of� DDT'.related compounds above the cumulative TTLC is relatively l,ocal,ized to an area less than approximately 20 by 20 feet near the entrance to the Quonset l but. 1 , Fuel" Tanks 3I - In the vicinity of the former underground storage tank location, Total Petroleum Hydrocarbons (TPH) as' diesel fuel were detected in the soil sample collected from WS-6 at. 1.5.# feet below grade at l 26 ppm. Toluene was detected in the 1.5 ,foot1soil sample at 0.2 ] ppm, and at the sample collected from 3 feet below grade at 0. 18 ppm. These concentrations are well below, the� average "designated level" for toluene in soils to protect grpund,� water (100 ppm) , as Il established -by the Central Valley RWQCB (J. Marshack, 1987) . Soil samples were not collected for analysis =from borehole WS-7. TPH was not detected in the ground-water �Isample collected from WS-6, but toluene was detected at 0.001 mg/l (ppm) . The ground- water sample collected from borehole WS-7� was` reported to contain 2.7 mg/l TPH as diesel fuel. Benzene, ethylbenzene and xylenes were not detected in any of the soil or ground-water samples collected from these two boreholes. Ground water was encountered at a depth of approximately six .feet below grade in both boreholes. It must be noted that analysisiresults of samples collected in this manner are qualitative only and may not accurately represent the actual cohcentrAions of the compounds in ground water. Such results indicate the potential presence of analytes in ground-water, but cannot be compared directly to numerical standards, action levels or guidelines. I� Low concentrations of toluene (ranging from 0. 034 to 0. 21 ppm) were detected in soil samples collected from WS-4 and WS-5, in the vicinity of the two above-ground diesel fuel tanks. TPH was not detected in the soil samples collected, nor was TPH or I� toluene detected in the ground-water samples collected from the two boreholes. i, f 12.3 Northwest Boundary Volatile organic compounds, base-neutral iland acid extractable compounds, and petroleum hydrocarbons were not detected in the -18- r