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i <br /> Table 4. Historical Groundwater Sample Results, <br /> ARCO Facility 434, Lodi, California <br /> Monitoring well <br /> number and Concentrations mµg/1, <br /> ' date sampled Benzene Toluene Ethylbenzene Xylenes TPH-G(a) MTBE <br /> W-1 t <br /> 4/10187 120 <10 <I0 <10 120000 <br /> ' 7123187 180 200 <2 5 190 <900 _- <br /> 11/13/87 1600 2300 1400 6900 147200 <br /> 1/5189 3680 740 130 2280 <br /> 4/10/89 2920 1050 <50 2830 -- <br /> 7/1I/89 1140 310 16 685 <br /> 10/89 <br /> Destroyed 5/90 - - `- <br /> ' I- <br /> W-IA <br /> 4/23190 490 81 41 540 <br /> ' 10/02/90 27 6 <0 5 8 -- <br /> 2/1/91 100 24 34 50 -- <br /> 4/18/91 110 58 <0 5 63 250 -- <br /> 7/24/91 75 5 5 <0 5 46 530 <br /> 10/23/91 20 <0 5 <0 5 <0 5 200 <br /> 2/11/92 18 <1 <1 <1 430 -- <br /> 5112192 5 6 <0 5 <0 5 <0 5 220 <br /> 8/18/92 65 <0 5 <0 5 <0 5 140 <br /> 11/17/92 <0 5 <0 5 <0 5 <0 5 <50 <br /> 2123/93 <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 <p 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 /> 6/23194 <0 3 <03 <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 <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 /> 4110/87 4100 9200 680 5500 64000 <br /> 7/23/87 14000 25000 2300 16000 281700 <br /> 11/13/87 6200 5300 5600 13000 343900 <br /> 6/24/88 3570 3900 755 3004 -- _ <br /> 10/3/88 260 500 110 410 <br /> ' 1/6/89 4400 4540 510 2740 <br /> . 4/6/89 4200 110 450 2620 -- <br /> 7/11/89 1 2090 1500 200 1150 <br /> 1 <br />