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Table 3. Analytical Results <br /> ARCO Station 2093,Tracy, California <br /> Monitoring well <br /> number Concentrations nn u 1 <br /> and date sampled Benzene Eth lbenzene Toluene Xylenes TPH-G(a) <br /> ATR-1 <br /> 4/23/87 <05 <0 5 <0 5 23 <100 <br /> 12/22/87 5 9 0 9 <0 5 <0 5 -- <br /> 3/24/88 <05 <0 5 <0 5 <0 5 -- <br /> 6/23/88 <05 4 3 1 3 2 2 -- <br /> 9/29/88 <0 5 <05 <0 5 <0 5 -- <br /> 2/22/89 14 <05 <0 5 18 <100 <br /> 6/21/89 360 2 1 0 8 36 520 <br /> 9/18/89 250 570 1200 7100 27000 <br /> 12/27/89 34 1 3 <0 3 14 <50 <br /> 4/18/90 21 16 1 5 16 13 <br /> 10/16/90 1 2 <0 5 2 <50 <br /> 10/19/90 - - - - - <br /> 1/10/91 24 5 7 <0 5 2 3 <50 <br /> 4/10/91 13 4 8 <0 5 <0 5 73 <br /> 7/10/91 2 47 <0 5 17 90 <br /> 9/24/91 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/23/92 <0.5 <05 <0.5 <0.5 <50 <br /> ATR-2 <br /> 4/23/87 <0 5 <0 5 06 <0 5 <100 <br /> 12/22/87 <0 5 <0.5 <0 5 <0 5 -- <br /> 3/24/88 <0 5 <05 <0 5 <0 5 -- <br /> 6/23/88 <0 5 <0 5 <0 5 <0 5 -- <br /> 9/29/88 <0 5 <0 5 <0 5 <0 5 -- <br /> 2/22/89 18 0 6 07 3 4 370 <br /> 6/21/89 19 04 <0 3 <0 3 <50 <br /> 9/18/89 19 1 1 09 8 2 9 <br /> 12/27/89 35 1 1 <0 3 0 3 <50 <br /> 4118/90 29 <03 <03 <03 50 <br /> 10/t6/90 <0 5 <05 <0 5 <0 5 <50 <br /> 10/19/90 - - - - - <br /> 1/10/91 0 8 <0 5 <0 5 <0 5 <50 <br /> 4/10/91 <0 5 <0.5 <0 5 <0 5 <50 <br /> 7/10/91 <0 5 <0.5 <0 5 <0 5 <50 <br /> 9/24/91 <0 5 <05 <0 5 <0 5 <50 <br /> 1123/92 <05 <0.5 <0.5 <0.5 <50 <br /> ATR-3 <br /> 4/23187 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 /> 6/29189 890 250 520 1100 4500 <br />