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Table 4. Historical Groundwater Sample Results, <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 /> W-1 <br /> 4/10/87 120 <1.0 <1.0 <1.0 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 5/90 <br /> W-1A <br /> 4/23/90 490 81 4.1 540 -- -- <br /> l0/02190 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 5.5 <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 /> 9/28/94 <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 <br /> - <br /> 11/17/95 <0.5 <0.5 <0.5 <0.5 <50 <3 <br /> 2/14/96 0.55 1.4 <0.5 11 <50 -- <br /> 5/9/96 <0.5 <0.5 <0.5 <0.5 <50 <br /> W-2 <br /> 4110187 4100 9200 680 5500 64000 -- <br /> 7/23/87 14000 25000 2300 16000 281700 -- <br /> 1 l/13/87 6200 5300 5600 13000 343900 -- <br /> 6/24/88 3570 3900 755 3000 -- <br /> 10/3/88 260 500 110 410 -- -- <br /> 1/6/89 4400 4540 510 2740 -- -- <br /> . 416/89 4200 110 450 2620 <br /> 7/11189 2090 1500 200 1150 <br />