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Table 2. Analytical Results of Groundwater Samples Collected at ARCO Station 2093,Tracy,California <br /> Aromatic volatile organics,ppb TPH,ppm <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total Dichloroethane, <br /> Number sampled Benzene benzene Toluene X lene TPH range range range lead m PPb <br /> ATR-4 4/2387 3000 <10 200 950 21 21 <1.0 <1.0 0.04 <br /> 12/22/87 5300 •430 - 310 M• 270.1. w- -- :. ..:.:- _- _..._ __ w -.. -- - <br /> ._ I .z.. -_ .-.._. .. r - .... . . .-- . <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 /> 2/22/89 1300 54 82 170 22 22 <0.1 <0.1 --(d) <br /> 6/2989 590 97 38 220 1.3 (e) (e) (e) 0.9 <br /> 9/18/89 280 49 13 100, 0.63 (e) (e) (e) -- <br /> ATR-5 3/1089 693 327 <5.0 7 6.6 6.6 <0.2 <0.2 -- <br /> 6/29/89 490 280 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 /> ATR-6 3/1089 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 -- <br /> 6/2189 <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 /> ATR-7 3/1089 <0.5 <0.5 <0.5 1.7 <0.2 <0.2 <0.2 <0.2 - <br /> 6/21/89 1 0.6 <0.3 0.5 <0.05 (c) (e) (e) <br /> 9/18/89 0.4 <0.3 <0.3 1.1 <0.05 (e) (e) (e) <0.5 <br /> (a)Drinking water action levels recommended by the Department of Health Services,April 1989. <br /> (b)No acton level established <br /> (c)RWQCB primary drinldng water standard(MCL)for lead,0.05 milligrams/liter. <br /> (d)Total lead was not tested because it has not been detected in any of the sampling intervals since March1987. ) <br /> (e)Hydrocarbons were not characterized. However,the hydrocarbons art within the low boiling point(C4-C 12)range which may <br /> indicate the presence of gasoline. <br /> (f) RWQCB primary MCL <br /> y <br /> _ <br />