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Table 3 Analytical Results <br /> ARCO Station 2093, Tracy, California <br /> Monitoring well <br /> number Concentrations in ug/l <br /> and date sampled Benzene Toluene EthylbenzeneXylenes <br /> TPH-G(a) <br /> ATR-I <br /> 4/23/87 <0 5 <0 5 <0 5 23 <100 <br /> 12/22/87 5 9 <0 5 0 9 <0 5 -- <br /> 3/24/88 <0 5 <0 5 <0 5 1 <0 5 <br /> 6123188 <0 5 I 3 43 2 2 -- <br /> 9/29/88 <0 5 <0 5 <0 5 <0 5 -- <br /> 2/22/89 14 <0 5 <0 5 18 <100 <br /> 6121189 360 0 8 2 1 36 520 <br /> 9118189 250 1200 570 7100 27000 <br /> 12/27/89 34 <0 3 13 1 4 <50 <br /> 4/18/90 21 15 16 16 13 <br /> 10/16/90 1 <0 5 2 2 <50 <br /> 1/10/91 24 <0 5 5 7 2 3 <50 <br /> 4110191 13 <05 48 <05 73 <br /> 7110/91 2 <0 5 4 7 1 7 90 <br /> 9/24/91 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/23192 <0 S <0 5 <0 5 <0 5 <50 <br /> 4/20/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 718192 <0 5 <0 5 0 6 <0 5 <50 <br /> 10/7102 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/18/93(b) -- -- -- -- -- <br /> 4/14/93 <0 5 <0 5 15 <0 5 <50 <br /> 8/30/93 <0 5 <0 5 <0 5 <0 5 <50 <br /> 10/27/93 <0 5 <0 5 <0 5 <0 5 <50 <br /> A 1 R-2 <br /> 4/23/87 <0 5 0 6 <0 5 <0 5 <100 <br /> 12122187 <0 5 <0 5 <0 5 <0 5 -- <br /> 3/24/88 <0 5 <0 5 <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 1 8 0 7 0 6 3 4 370 <br /> 6/21189 1 9 <0 3 0 4 <0 3 <50 <br /> 9/18189 1 9 0 9 1 1 8 2 9 <br /> 12/27/89 3 5 <0 3 1 1 0 3 <50 <br /> 4118190 29 <0 3 <0 3 <0 3 50 <br /> 10/16/90 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/10/91 0 8 <0 5 <0 5 <0 5 <50 <br /> 4110191 <0 5 <0 5 <0 5 <0 5 <50 <br /> 7/10/91 <0 5 <0 5 <0 5 <0 5 <50 <br /> 9124/91 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/23/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 4/20/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 718192 2 8 <0 5 <0 5 <0 5 <50 <br />