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. Table 4. Historical Groundwater Sample Results Continued, <br /> ARCO Facility 434, Lodi, California <br /> Monitoring well <br /> number and Concentrations in pg/L <br /> date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G(a) MTBE <br /> 10/04/90 <0 5 <0 5 <0 5 <0 5 --1/31/91 <0 5 <0 5 <0 5 <0 5 -- <br /> 4/18/91 <br /> -4/18/91 9 2 <0 5 <0 5 <0 5 <50 -- <br /> 7/25/91 4 9 0 6 <0 5 <0 5 ILO -- <br /> 10/24/91 l I <0 5 <0 5 <0 5 <50 -- <br /> 2/10/92 <0 8 <0 5 <0 5 <0 5 60 -- <br /> 5/12/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 8/18/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/16/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 2/22193 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 5/25/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 823/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> i 1/16/931 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 322/94 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 6/23/94 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 9128/94 <0 5 1 1 <0 5 <0 5 <50 <br /> 12/19/94 2 2(n) <0 5 <0 5 <0 5 <50 -- <br /> 32/95 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 5/18/95 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 8110195 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/17/95 <0 5 <0 5 <0 5 <0 5 <50 <3 <br /> 2114196 065 1 7 <0 5 12 55 -- <br /> 5/9/96 2 8 4 4 098 6 4 <50 -- <br /> W-6 <br /> 723/87 <0 5 <0 5 <0 5 <0 5 <900 -- <br /> 11/13/87 <0 5 <0 5 <0 5 <0 5 -- <br /> 6/24/88 <0 5 <0 5 <0 5 <0 5 -- -- <br /> 10/3/88 <0 5 <0 5 <0 5 <0 5 -- -- <br /> 1/4/89 <0 5 <0 5 <0 5 <0 5 — — <br /> 4/4189 <0 5 <0 5 <0 5 <0 5 --7/10/89 <0 5 <0 5 <0 5 <0 5 -- <br /> 10/16/89 <0 5 <0 5 <0 5 <0 5 -- <br /> 1/19/90 1 8 5 6 3 7 31 390 -- <br /> 5110/90 0 3 13 04 4 2 -- <br /> 10/04190 10 13 1 13 -- -- <br /> 1/30/91 <0 5 <0 5 <0 5 <0 5 -- <br /> 4/18/91 <0 5 <0 5 <0 5 <0 5 <50 — <br /> 725/91 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/23/91 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 2/10192 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 5/12/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 8/18/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/16/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 222/93 <0 5 <0 5 <0 5 <0 5 <50 <br /> 5/25/93 <0 5 <0 5 <0 5 <0 5 <50 <br />