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Table 3. Analytical Results <br /> ARCO Station 2093, Tracy, California (continued) <br /> Monitoring well <br /> number Concentrations in ugA <br /> and date sampled Benzene Eth /benzene Toluene Xylenes__ TPH-G(a) <br /> ATR-3 <br /> 4/23/87 2300 <5 0 180 2300 17000 <br /> 12/22/87 5000 530 50 250 -- <br /> 3/24/88 8300 4400 8700 7800 43000 <br /> 6/23/88 6160 1800 4221 4750 70000 <br /> 9/29/88 8850 2190 17600 8170 57400 <br /> 2/22189 1000 480 2100 2000 110000 <br /> 6/29/89 890 250 520 1100 4500 <br /> 9/18/89 1000 460 1300 2200 7400 <br /> 12/28/89 840 840 1400 5600 27000 <br /> 4/18/90 1000 340 490 1500 4800 <br /> 10/16/90 1900 780 1300 4600 14000 <br /> 1/10/91 610 160 230 670 2600 <br /> 4/10/91 910 110 120 190 3000 <br /> 7/10/91 420 340 300 760 19000 <br /> 9/24/91 280 69 81 130 2000 <br /> 1/23/92 --(c) --(c) --(c) --(c) --(c) <br /> 4/20/92 --(c) --(c) --(c) --(c) --(c) <br /> 7/8/92 --(c) --(c) --(c) --(c) --(c) <br /> 10/7/92 --(c) --(c) --(c) --(c) --(c) <br /> 1/18/93 -- -- -- -- -- <br /> ATR-4 <br /> 4/23/87 3000 <10 200 950 21000 <br /> 12/22/87 5300 430 310 270 -- <br /> 3/24/88 5800 930 320 740 6000 <br /> 6/23/88 237 2 8 8 10 5200 <br /> 9/29/88 1430 350 115 130 1400 <br /> 2/22/89 1300 54 82 170 22000 <br /> 6129/89 590 97 38 220 1300 <br /> 9/18/89 280 49 13 100 630 <br /> 12/28/89 500 56 25 160 1300 <br /> 4/18/90 150 35 51 63 440 <br /> 10/16/90 26 4 8 41 038 380 <br /> 1/10/91 150 30 31 35 330 <br /> 4/10/91 8 4 <0 5 <0 5 24 500 <br /> 7/10/91 39 37 <0 5 3 190 <br /> 9124/91 22 42 <05 15 70 <br /> 1/23/92 300 49 5 2 72 1200 <br /> 4/21192 150 36 <5 29 560 <br /> 7/8/92 150 36 21 39 590 <br /> 10/8/92 240 62 4 8 97 1200 <br /> 1/19/93 240 44 5.5 90 1200 <br />