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' Table 4. Historical Groundwater Sample Results Continued, <br /> • ARCO Facility 434, Lodi, California <br /> 1 Monitoring well <br /> number and Concentrations inµg/L <br /> ' date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G (a) MTBE <br /> 1018//89 496 206 87 2I9 <br /> 1122/90 3600 4500 470 5000 18000 -- <br /> ' 5/9/90 4900 4000 350 5000 <br /> 10/2/90 2800 2300 260 2900 <br /> 2/1/91 2600 1400 150 1600 -- -- <br /> 4/16/91 4300 2200 110 1700 16000 -- <br /> ' 7/24/91 4900 740 110 1300 16000 -- <br /> 10/23/91 440 120 64 410 4000 -- <br /> 2/10/92 -- -- <br /> 5/12/92 <br /> -S/12/92(b) <br /> 8!18/92 {b} <br /> 11/16/92(b) <br /> ' 2/22/93 (b) -- <br /> 5/25/93 (b) -- -- -- -- <br /> 8/23/93 (b) <br /> 11/17/93 (b) <br /> ' 3122194 (b) -- <br /> 6/23/94(b) <br /> 9128/94 (b) -- -- -- <br /> 12/19/94 (b) -- — <br /> 12/29/94 <br /> -- <br /> 12/29/94(c) <0 5 <0 5 <0 5 <05 <50 <br /> 3/2/95 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 5/19/95 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> ' 8/10/95 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/17/95 <0 5 <0 5 <0 5 <0 5 <50 <3 <br /> 2/14/96 <0 5 <0 5 <0 5 19 <50 -- <br /> 5/9/96 <0 5 <0 5 <0 5 <0 5 <50 <br /> W-2A <br /> ' 6124188 437 937 140 672 -- <br /> 10/3/88 558 16 3 6 4 153 <br /> 1/4/89 760 220 11 214 -- <br /> ' 4/4/89 700 14 4 78 3 520 <br /> 7/9/89 390 90 30 100 <br /> 10/16/89 3090 1060 50 1110 -- <br /> 1/18/90 <br /> -1/18/90 900 510 64 63 5 2400 -- <br /> 519/90 2500 1500 150 2100 -- <br /> 1012/90 (d) -- <br /> 1129/91 <br /> 1/29/9/ -- -- -- -- -- -- <br /> 3115191 (d) <br /> 7/22/91 <br /> 10/22/9I (d) -- __ -- <br /> ' 2/11/92 17 3 7 10 37 150 <br /> 5/12/92 <0 5 <0 5 <0 5 <05 <50 <br /> 8/18192(d) -_ <br /> 11/16/92 (d) <br /> 1 <br />