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M k le <br /> . Table 4. Historical Groundwater Sample Results, <br /> ARCO Facility 434, Lodi, California <br /> Monitoring well <br /> number and Concentrations inµg/L <br /> date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G(a) MTBE <br /> W-I <br /> 4/10/87 120 <10 <10 <10 120000 -- <br /> 7/23/87 180 200 <2 5 190 <900 -- <br /> 11/13/87 1600 2300 1400 6900 147200 -- <br /> 1/5/89 3680 740 130 2280 -- <br /> 4/10/89 2920 1050 <50 2830 <br /> 7/11/89 1140 310 16 685 <br /> 10/89 -- -- -- -- -- -- <br /> Destroyed 5190 <br /> W-IA <br /> 4/23/90 490 81 41 540 <br /> 10/02/90 27 6 <0 5 8 <br /> 2/1/91 100 24 3 4 50 -- <br /> 4/18/91 110 5 8 <0 5 6 3 250 -- <br /> 7/24/91 75 55 <0 5 4 6 530 -- <br /> 10/23/91 20 <0 5 <0 5 <0 5 200 -- <br /> 2/11/92 18 <1 <1 <1 430 -- <br /> 5/12/92 5 6 <0 5 <0 5 <0 5 220 =_ <br /> 8/18/92 6 5 <0 5 <0 5 <0 5 140 <br /> 11/17/92 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 2/23/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 5/26/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 8/23/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 11/17/93 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 3/22/94 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 6/23/94 <0 3 <0 3 <0 3 <0 5 <10 -- <br /> 928/94 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 12/19/94 <0 5 <0 5 <0.5 <0 5 <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 /> 2/14/96 055 14 <0 5 11 <50 -- <br /> 5/9/96 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> W-2 <br /> 4/10/87 4100 9200 680 5500 64000 -- <br /> 7/23/87 14000 25000 2300 16000 281700 -- <br /> 11/13/87 6200 5300 5600 13000 343900 -- <br /> 624/88 3570 3900 755 3000- -- <br /> 10/3/88 260 500 110 410 -- -- <br /> 1/6/89 4400 4540 510 2740 -- <br /> 4/6/89 4200 Ito 450 2620 4 <br /> 7/11/89 2090 1500 200 1150 <br />