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Table 2. Analytical Results of Groundwater Samples Collected at ARCO Station 2093,Tracy,Califor,ria <br /> Aromatic volatile organics(RETX),ppb TPH,ppm <br /> 1,2- <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total Dicl-doroethane <br /> Number sampled Benzene benzene Toluene X leve TPH range range range lead ppm. ( b) <br /> DHS <br /> levels <br /> (a) 1(a) 680(a) 100(b) 1750(a) (c) (c) (c) (c) (d) 0.5(a) <br /> ATR-1 4/23/87 <0.5 <0.5 <0.5 23 <0.1 <0.1 <0.1 <0.1 0.024 <br /> 12)22/87 5.9 0.9 <0.5 <0.5 -- - - - -- <br /> 3/2488 <0.5 <0.5 <().5 <0.5 <0.2 <0.2 <0.2 <0.1 <br /> 6/2388 <0.5 4.3 1.3 2.2 - <0.2 <0.2 <0.2 <0.1 <br /> 9/2988 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.1 <br /> 2/2289 1.4 <0.5 <0.5 1.8 <0:1 <0.1 <0.1 <0.1 -- <br /> 6/21/89 360 2.1 0.8 36 0.52 (e) (e) (e) <br /> 9/18/89 250 570 1200 7100 27 (e) (e) (e) - a0 <br /> 12/27/89 3.4 1.3 <0.3 1.4 <0.05 (e) (e) (e) -- <0•5 <br /> ATR-2 4/23/87 <0.5 <0.5 0.6 <0.5 <0.1 <0.1 <0.1 <0.1 0.018 <br /> 12/22/87 <0.5 <0.5 <0.5 <0.5 -- - - - -- <br /> 3/24/88 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 6/2388 <0.5 <0.5 <0.5 <0.5 - <0.2 <0.2 <0.2 <0.1 <br /> 9/29/88 <0.5 <0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <0.1 <br /> 2/22/89 1.8 0.6 0.7 3.4 0.37 0.37 <0.1 <0.1 <br /> 6/21/89 1.9 0.4 <0.3 <03 <0.05 (e) (e) (e) -- <br /> 9/18/89 1.9 1.1 0.9 8.2 0.009 (e) (e) (e) 1.6 <br /> 12/27/89 3.5 1.1 <0.3 0.3 <0.05 (e) (e) (e) -- 7 <br /> ATR-3 4/23/87 2300 <5.0 180 2300 17 17 <0.1 <0.1 0.1 <br /> 12/22/87 5000 530 50 250 -- - - <br /> 3/2488 8300 4400 8700 7800 43 43 <0.5 <0.5 <0.1 <br /> 6/2388 6160 1800 4221 4750 70 70 <0.2 <0.2 <0.1 <br /> 9/29/88 8850 2190 17600 8170 57.4 57.4 <1.0 <1.0 <0.1 <br /> 2/2289 1000 480 2100 2000 110 110 <0.1 <0.1 -- <br /> 6/29/89 890 250 520 1100 4.5 (e) (e) (e) <br /> 9/18/89 1000 460 1300 2200 7.4 (e) (e) (e) _- - 19 <br /> 12/28/89 840 840 1400 5600 27 (e) (e) (e) - QO <br /> F <br />