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. Table 4. Historical Groundwater Sample Results Continued, ARCO Facility 434, Lodi, California Monitoring well number and Concentrations in µg/L date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G(a) MTBE 10/04/90 <0 5 <0 5 <0 5 <0 5 -- -- 1/31/91 <0 5 <0 5 <0 5 <0 5 -- 4/18/91 -4/18/91 92 <0 5 <0 5 <0 5 <50 -- 7/25/91 49 06 <0 5 <0 5 110 -- 10/24/91 1 l <0 5 <0 5 <0 5 <50 2/10/92 <0 8 <0 5 <0 5 <0 5 60 -- 5/12/92 <0 5 <0 5 <0 5 <0 5 <50 8/18/92 <0 5 <0 5 <0 5 <0 5 <50 11/16/92 <0 5 <0 5 <0 5 <0 5 <50 -- 2/22/93 <0 5 <0 5 <0 5 <0 5 <50 -- 5/25/93 <0 5 <0 5 <0 5 <0 5 <50 -- 8/23/93 <0 5 <0 5 <0 5 <0 5 <50 11/16/93 <0 5 <0 5 <0 5 <0 5 <50 -- 3/22/94 <0 3 <0 3 <0 3 <0 5 <10 -- 6/23/94 <0 3 <0 3 <0 3 <0 5 <10 -- 9/28/94 <0 5 1 1 <0 5 <0 5 <50 -- 12/19/94 2 2(1) <0 5 <0 5 <0 5 <50 -- 3/2/95 <0 5 <0 5 <0 5 <0 5 <50 -- 5/18/95 <0 5 <0 5 <0 5 <0 5 <50 -- 8/10/95 <0 5 <0 5 <0 5 <0 5 <50 -- 11/17/95 <0 5 <0 5 <0 5 <0 5 <50 <3 2/14196 065 17 <0 5 12 55 -- 5/9/96 28 44 098 64 <50 -- W-6 7/23/87 <0 5 <0 5 <0 5 <0 5 <900 11/13187 <0 5 <0 5 <0 5 <0 5 -- 6/24/88 <0 5 <0 5 <0 5 <0 5 -- -- 10/3/88 <0 5 <0 5 <0 5 <0 5 -- -- 1/4/89 <0 5 <0 5 <0 5 <0 5 -- -- 4/4/89 <0 5 <0 5 <0 5 <0 5 --7/10/89 <0 5 <0 5 <0 5 <0 5 -- -- 10/16/89 <0 5 <0 5 <0 5 <0 5 -- 1/19/90 18 56 3 7 31 390 -- 5/10/90 03 13 04 42 -- 10/04/90 10 13 1 -- 1/30/91 <0 5 <0 5 <0 5 <0 5 -- 4/19/91 -4/19/91 <0 5 <0 5 <0 5 <0 5 <50 -- 7/25/91 <0 5 <0 5 <0 5 <0 5 <50 10/23/9I <0 5 <0 5 <0 5 <0 5 <50 -- 2/10/92 <0 5 <0 5 <0 5 <0 5 <50 -- 5/12/92 <0 5 <0 5 <0 5 <0 5 <50 -- 8/18/92 <0 5 <0 5 <0 5 <0 5 <50 -- 11/16/92 <0 5 <0 5 <0 5 <0 5 <50 -- 2/22/93 <0 5 <0 5 <0 5 <0 5 <50 -- 525/93 <0 5 <0 5 <0 5 <0 5 <50 --