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� V <br /> Table 2. Analytical Results of Groundwater Samples Collected at ARCO Station 2093,Tracy, California <br /> Aromatic volatile organics(BETX),ppb TPH,ppm <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total <br /> w,. Number sampled Benzene benzene Toluene Xylene TPH range range range lead ppm <br /> DHS <br /> 4.r action <br /> IeveIs <br /> (a) 1 680 1,750 620 (b) (b) (b) (c) <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 /> 3/24/88 <0.5 <0.5 <0.5 <0.5 - <0.2 <0.2 <02 <0.1 <br /> 4,0 6/23/88 <0.5 4.3 1.3 2.2 - <0.2 <0.2 <0.2 <0.1 <br /> 9/29/88 <0.5 <0.5 <0.5 <0.5 - <0.2 <0.2 <0.2 <0.1 <br /> 2/22/89 1.4 <0.5 <0.5 1.8 <0.1 <0.1 <0.1 <0.1 -(d) <br /> 4' 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.I <br /> +.• 6/23/88 <0.5 <0.5 <0.5 <0.5 - <0.2 <0.2 <0.2 <0.I <br /> 9/29/88 <0.5 <0.5 <0.5 <0.5 -- <1.0 <1.0 <1.0 <0.I <br /> 2/22/89 1.8 0.6 0.7 3.4 0.37 0.37 <0.1 <0.1 -(d) <br /> LO <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 /> 3/24/88 8300 4400 8700 7800 43 43 <0.5 <0.5 <0.1 <br /> 4.0 6/23/88 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 /> 2/22/89 1000 480 2100 2000 110 110 <0.1 <0.1 -(d) <br /> 4 <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 /> t. 3/24/88 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.I <br /> 2/22/89 1300 54 82 170 220 220 <0.1 <0.I -(d) <br /> V <br /> ATR-5 3/10/89 693 327 <5.0 7 6.6 6.6 <0.2 <0.2 - <br /> t,. ATR-6 3/10/89 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 - <br /> ATR-7 3/10/89 <0.5 <0.5 <0.5 1.7 <0.2 <02 <0.2 <0.2 - <br /> (a)Drinking water action levels recommended by the Department of Health Services,September 1987. <br /> (b)No acton level established <br /> (c)RWQCB primary drinking water standard(MCL)for lead,0.05 milligrams/liter. <br /> i+ (d)Total lead was not tested because it has not been detected in any of the sampling intervals since Manch 1987. <br /> LO <br /> 1.r <br />