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Table 1. Analytical Results of Groundwater Samples Collected at ARCO Station 2093, Tracy, California. <br /> Aromatic volatile organics (BTEX), ppb Total petroleum hydrocarbons, ppm <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total <br /> number sampled Benzene Toluene benzene Xylene TPM range range range lead, ppm <br /> DHS <br /> action <br /> levels(a) 0.7 100 680 620 ( b ) ( b) (b) (c) <br /> ATR-1 Dec. 87 5.9 <0.5 1 <0.5 - - _ - _ <br /> Mar. 88 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 <0.1 <br /> Jun. 88 <0.5 1 4 2 <0.2 <0.2 <0.2 <0.2 <0.1 <br /> Sept. 88 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 <0.1 <br /> ATR-2 Dec. 87 <0.5 <0.5 <0.5 <0.5 - - - - _ <br /> Mar. 88 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> Jun. 88 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 <0.i <br /> Sept. 88 <0.5 <0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <1.0 <0.1 <br /> ATR-3 Dec. 87 51000 50 530 250 - - - - _ <br /> Mar. 88 8,300 8,700 4,400 7,800 43 43 <0.5 <0.5 <0.1 <br /> Jun. 88 6,160 4,221 1 ,800 4,750 70 70 <0.2 <0.2 <0.1 <br /> Sept. 88 8,850 17,600 2,190 8,170 57 57 <1.0 <1.0 <0.1 <br /> ATR-4 Dec. 87 5,300 310 430 270 - - _ - _ <br /> Mar. 88 5,800 320 930 740 6 6 <0.5 <0.5 <0.1 <br /> Jun. 88 237 9 2 10 5 5 <0-2 <0.2 <0.1 <br /> Sept. 88 1 1 ,430 115 350 130 1 1 <1.0 <1.0 <0.1 <br /> (a) Drinking water action levels recommended by the Department of Health Services, September 1987. <br /> (b) No action level established. <br /> (c) Regional Board primary drinking water standard (MCL) for lead, 0.05 milligrams/liter. <br />