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Table 3. Analytical Results <br /> ARCO Station 2093, Tracy, California <br /> Monitoring well <br /> number Concentrations in u I <br /> and date sampled Benzene Eth lbenzene Toluene Xylenes TPH-G(a) <br /> ATR-1 <br /> 4123/87 <0 5 <0 5 <0 5 23 <100 <br /> 12/22/87 59 09 <0 5 <0 5 -- <br /> 3/24/88 <0 5 <0 5 <0 5 <0 5 -- <br /> 6/23/88 <0 5 43 1 3 22 -- <br /> 9/29/88 <0 5 <0 5 <0 5 <0 5 -- <br /> 2/22/89 14 <0 5 <0 5 1 8 <100 <br /> 6/21/89 360 21 08 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 15 16 13 <br /> 10/16/90 1 2 <0 5 2 <50 <br /> 1/10/91 24 57 <0 5 23 <50 <br /> 4/10/91 1 3 48 <0 5 <0 5 73 <br /> 7/10/91 2 47 <0 5 1 7 °n <br /> 9124/91 <0 5 <0 5 <0 5 <0 5 ,50 <br /> 1/23/92 <0 5 <0 5 <0 5 <0 5 <<(' <br /> 4/20/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 7/8/92 <0 5 06 <0 5 <0 5 <50 <br /> 10/7/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/18/93(b) -- -- -- -- -- <br /> 4/14/93 <0 5 1.5 <0.5 <0 5 <50 <br /> ATR-2 <br /> 4/23187 <0 5 <0 5 06 <0 5 <100 <br /> 12/22/87 <0 5 <0 5 <0 5 <0 5 -- <br /> 3/24188 <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 18 06 07 34 370 <br /> 6/21/89 19 04 <0 3 <0 3 <50 <br /> 9/18/89 19 1 1 09 82 9 <br /> 12/27/89 35 1 1 <0 3 03 <50 <br /> 4/18/90 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 08 <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 /> 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 /> 7/8/92 28 <0 5 <0 5 <0 5 <50 <br /> 10/7/92 57 <0 5 <0 5 <0 5 59 <br /> 1/18/93(b) - <br /> 4/14/93 3.8 08 0.7 1.9 55 <br />