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Table 2. Analytical Results of Groundwater Samples Collected at ARCO Station 2093,Tracy,California <br /> Aromatic volatile organics(BETX),ppb TPH,ppm <br /> 1,2- <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total Dichloroethane <br /> Number sampled Benzene benzene Toluene Xylene TPH range range range lead ppm (22b) <br /> DHS T M: <br /> levels <br /> (a) 1 (a) 680(a) 100(b) 1750(a) (c) (c) (c) (c) (d) 0.5(a) <br /> ATR-4 4/23/87 3000 <10 200 950 21 21 <1.0 <1.0 0.04 <br /> 12/22/87 5300 430 310 270 -- - - - -- <br /> 3/2488 5800 930 320 740 6 6 <0.5 <0.5 <0.1 <br /> 6/23/88 237 2 8.8 10 5.2 5.2 <0.2 <0.2 <0.1 <br /> 9/29/88 1430 350 115 130 1.4 1.4 <1.0 <1.0 <0.1 <br /> 2/2289 1300 54 82 170 22 22 <0.1 <0.1 -- <br /> 6/2989 590 97 38 220 1.3 (e) (e) (e) <br /> 9/18/89 280 49 13 100 0.63 (e) (e) (e) -- 0.9 <br /> 12/28/89 500 56 25 160 1.3 (e) (e) (e) <2 <br /> ATR-5 3/1089 693 327 <5.0 7 6.6 6.6 <0.2 <0.2 <br /> 6/2989 490 280 2.4 1.3 2.2 (e) (e) (e) <br /> 9/18/89 68 63 1.1 5.8 1 (e) (e) (e) -- <0.5 <br /> 12/2789 94 150 2 <1 2.2 (e) (e) (e) <2 <br /> ATR-6 3/1089 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 <br /> 6/21/89 <0.3 <0.3 <0.3 0.3 <0.05 (e) (e) (e) - <br /> 9/1889 0.5 0.3 1.3 3.8 <0,05 (e) (e) (e) <0.5 <br /> 12/2789 <0.3 <0.3 <0.3 0.4 <005 (e) (e) (e) <0.5 <br /> ATR-7 3/1089 <0.5 <0.5 <0.5 1.7 <0.2 <0.2 <0.2 <0.2 1 <br /> 6/2189 1 0.6 <0.3 0.5 <0.05 (e) (e) (e) -- <br /> 9/1889 0.4 <0.3 <0.3 1.1 <0.05 (e) (e) (e) -- <0.5 <br /> 12/27/89 10 2.7 0.9 7.9 0.09 (e) (e) (e) <0•5 <br /> (a)Department of Health Services(DHS)Maximum Contaminant Level(MCL). <br /> (b)DHS Drinking Water Action Level(no MCL established). <br /> (c)No MCL or Action Level Established. <br /> (d)DHS primary drinking water standard(MCL)for lead,0.05 milligrams/liter. <br /> (e)Hydrocarbons were not characterized. However.the hydrocarbons are within the low boiling point(C4-C12)range which may <br /> indicate the presence of gasoline. <br />