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4 <br /> Y <br /> Table 1. Analytical Results of Groundwater Sam les, ARCO Station 2093, Tracy, Ca. <br /> Aromatic Volatile Or anics b Total Petroleum H drocarbons, ppm <br /> Sample Date Ethyl- Gasoline Diesel Motor oil Total <br /> number sampled Benzene benzene Toluene X lene TPH range range range lead, ppm <br /> DHS <br /> action <br /> levels <br /> a 1 1750 1 100 620 b b b b 0.05 c <br /> ATR-1 12/22/87 5.9 0.9 <0.5 <0.5 - - - - - <br /> 3/24/88 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 6/23/88 <0.5 4.3 1 .3 2.2 <0.2 <0.2 <0.2 <0.2 <0.1 <br /> 9129/88 <0.5 <0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <1.0 <0.1 <br /> 2/22189 1 .4 <0.5 <0.5 1 .8 <0.1 <0.1 <0.1 <0.1 -- d <br /> ATR-2 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 <0.5 <0.1 <br /> 6/23/88 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 <0.2 <0.2 <0.1 <br /> 9129188 <0.5 <0.5 <0.5 <0.5 <1.0 <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 -- d <br /> ATR-3 12/22/87 5,000 530 50 250 - - - - - - - <br /> 3/24/88 8,300 4,400 8,700 7,800 43 43 <0.5 <0.5 <0.1 <br /> 6123188 6,160 1 ,800 4,221 4,750 70 . 70 <0.2 <0.2 <0.1 <br /> 9129/88 8,850 2,190 17,600 8,170 57.4 57.4 <1.0 <1.0 <0.1 <br /> -2/22/8.9--.. .1 ,000 .4-80 2,100 .- 2,000- - . 11.0. 1-10- . .- -<0.1 <0.1. _ __. . .d . <br /># ATR-4 12/22/87 5,300 430 310 270 - - - - - <br /> 3/24/88 5,800 930 320 740 6 6 <0.5 <0.5 <0.1 <br /> 6123/88 237 2 9 10 5.2 5.2 <0.2 <0.2 <0.1 <br /> 9/29/88 1 ,430 350 115 130 1 .4 1 .4 <1.0 <1.0 <0.1 <br /> 2122189 1 1 ,300 54 82 170 220 220 <0.1 <0.1 I -- d <br /> (a) Drinking water action levels recommended by the Department of Health Services, April 1989. <br /> (b) No action level established. <br /> (c) Department of Health Services primary drinking water standard for lead, 0.05 milligrams/liter. <br /> (d) Total lead was not tested because it has not been detected in any of the previous sampling. <br /> 5 <br />