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Table 3. Analytical Results ARCO Station 2093, Tracy, California Monitoring well number Concentrations in u and date sampled Benzene Etll lbenzene Toluene Xylenes; TPH-G(a) ATR-1 4/23/87 <0 5 <0 5 <0 5 23 <100 12/22/87 5 9 0 9 <0 5 <0 5 -- 3/24/88 <0 5 <0 5 <0 5 <0 5 -- 6/23/88 <0 5 4 3 13 2 2 -- 9/29/88 <0 5 <0 5 <0 5 <0 5 -- 2122/89 14 <0.5 <0 5 18 <100 6/21/89 360 2.1 08 36 520 9/18/89 250 570 1200 7100 27000 12/27/89 3 4 13 <0 3 14 <50 4/18/90 21 16 1.5 16 13 10/16/90 1 2 <0 5 2 <50 1/10/91 2 4 5.7 <0 5 2 3 <50 4/10/91 13 4 8 <0 5 <0 5 73 7/10191 2 4 7 <0.5 17 90 9/24/91 <0 5 <0 5 <0 5 <0 5 <50 1/23/92 <0 5 <0 5 <0 5 <0 5 <50 4/20/92 <0 5 <0 5 <0 5 <0 5 <50 7/8/92 <0.5 06 <0.5 <0.5 <50 10/1192 <0.5 <0.5 <0.5 <0 5 <50 1/18/93(b) -- -- -- -- ATR-2 4/23/87 <0.5 <0.5 0 6 <0.5 <100 12/12187 <0.5 <0.5 <0.5 <0 5 -- 3/2,4188 <0 5 <0 5 <0.5 <0.5 6/23/88 <0.5 <0.5 <0.5 <0.5 -- 9/29/88 <0 5 <0 5 <0.5 <0.5 -- 2/21189 1.8 0.6 0.7 3.4 370 6/21/89 19 0.4 <0.3 <0.3 <50 9/18/89 1.9 1.1 0.9 8.2 9 12!27/89 3 5 1.1 <0 3 0 3 <50 4/18/90 2.9 <0.3 40.3 <0.3 50 10/16/90 <0.5 <0.5 <0.5 <0 5 <50 1/10/91 0 8 <0.5 <0.5 <0.5 <50 4/10/91 <0 5 <0.5 <0 5 <0.5 X50 7/10/91 <0.5 <0.5 <0.5 <0.5 X50 9/24/91 <0 5 <0.5 <0 5 <0 5 <50 1/2.3/92 <0.5 <03 <0.5 <0 5 <50 4/20/92 <0 5 <0.5 <0.5 <0.5 <50 7/8/92 2.8 <0.5 <0.5 <0 5 <50 1017/92 5-7 <0.5 <0 5 <0.5 59 1/l8/93(b}