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Table 3. Analytical Results for ARCO Facility 2093, Tracy, California Monitoring well number and Concentrations in Q/L date sampled Benzene Toluene Eth ]benzene Xylenes TPH-G (a) ATR-1 4/23187 <0 5 <0 5 <0 5 23 <100 12/22/87 5 9 <0 5 0 9 <0 5 -- 3/24/88 <0 5 <0 5 <0 5 <0 5 -- 6/23/88 <0 5 1 3 43 2 2 _ 9/29188 <0 5 <0 5 <0 5 <0 5 -- 2122/89 1 4 <0 5 <0 5 1 8 <100 6/21/89 360 0 8 2 1 36 520 9/18/89 250 1200 570 7100 27000 12/27/89 3 4 <0 3 l 3 1 4 <50 4118190 21 1 5 16 16 13 10/16/90 1 <0 5 2 2 <50 1/10191 2 4 <0 5 5 7 2 3 <50 4/10/91 1 3 <0 5 4 8 <0 5 73 7110191 2 <05 47 1 7 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 <0 5 0 6 <0 5 <50 10/7/92 <0 5 <0 5 <0 5 <0 5 <50 I/18/93(b) -- __ -- 4/14/93 <0 5 <0 5 1 5 <0 5 <50 8/30193 <0 5 <0 5 <0 5 <0 5 <50 10/27/93 <0 5 <0 5 <0 5 <0 5 <50 2/18/94 0 6 1 1 0 8 17 5/20194 0 6 0 3 1 4 <0 5 27 10/7194 <0 5 <0 5 <0 5 <0 5 <50 12/16/94 <0 5 <0 5 <0 5 <0 5 <50 2/28/95 <0 5 <0 5 l <0 5 <50 4/26/95 <0 5 <0 5 <0 5 <0 5 <50 7127/95 (c) __ 10/27/95 <0 5 <0 5 <0 5 <0 5 <50 ATR-2 4/23/87 <0 5 0 6 <0 5 <0 5 <100 12/22/87 <0 5 <0 5 <0 5 <0 5 -- 3/24/88 <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 -- 2/22/89 1 8 0 7 0 6 3 4 370 6/21/89 1 9 <0 3 0 4 <0 3 <50 9/18/89 1 9 0 9 1 1 8 2 9 12/27/89 3 5 <0 3 1 1 0 3 <50 4118/90 2 9 <0 3 <0 3 <0 3 50 10/16/90 <0 5 <0 5 <0 5 <0 5 <50 1/10191 0 8 <0 5 <0 5 <0 5 <50 4/10/91 <0 5 <0 5 <0 5 <0 5 <50 7/10/91 <0 5 <0 5 <0 5 <0 5 <50 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 2 8 <0 5 <0 5 <0 5 <50 10/7/92 5 7 <0 5 <0 5 <0 5 59