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TABLE 1 (continued) Casing Depth Groundwater LPH Concentration(4g/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (ft msl) (ft) (ft msl) A Benzene Toluene benzene Xylenes TPH-g MTBE RW3 02/13/96 8 89 2484 -1595 000 4,800 5,800 2,100 8,700 59,000 <500 04/18/96 2245 -13 56 000 5,100 6,700 2,600 11,000 78,000 <250 08/08/96 23 60 -1471 000 4,200 5,900 2,600 12,000 58,000 <1,250 11/04/96 23 94 -1505 000 4,300 4,300 2,600 11,000 67,000 <250 02/03/97 -- -- -- -- -- -- -- " '- 05/08/97 Converted to WB well RW4 01/30/91 923 3480 -25 57 000 30,000 41,000 4,500 27,000 170,000 -- 05/02/91 3479 -2556 000 16,000 34,000 4,200 22,000 110,000 -- 07/16-17/91 3569 -2646 000 12,000 31,000 2,700 14,000 110,000 -- 10/15/91 3622 -2699 000 13,000 28,000 3,100 15,000 120,000 -- 01/28/92 3439 -25 16 000 13,000 30,000 3,600 18,000 110,000 -- 04/30/92 3404 -2481 000 11,000 25,000 2,800 13,000 98,000 -- 08/13/92 3618 -2695 000 8,500 24,000 2,500 13,000 120,000 -- 10/08/92 3678 -2755 000 6,000 17,000 1,700 10,000 95,000 -- 02/23/93 3332 -2409 000 7,000 16,000 3,000 14,000 88,000 -- 05/18/93 3184 -2261 000 5,700 18,000 2,600 4,100 57,000 -- 08/22/93 3220 -2297 000 -- -- -- -- -- 12/30/93 3133 -22 10 000 5,200 23,000 3,500 16,000 88,000 -- 02/17/94 3080 -2157 000 -- -- -- -- -- -` 05/10/94 3023 -2100 000 2,400 15,000 2,300 9,700 70,000 -- 08/02/94 3179 -2256 000 4,100 26,000 4,000 18,000 100,000- 11/01/94 00,00011/01/94 3227 -2304 000 2,700 17,000 2,300 11,000 69,000 -- 02/17/95 29 70 -2047 000 1,000 9,100 1,900 7,600 45,000 -- 05/11/95 26 96 -1773 000 1,400 11,000 1,600 7,400 59,000 -- 08/24/95 2800 -1877 0 00 590 4,500 970 3,700 17,000 -- 10/19/95 2839 -19 16 000 510 3,100 950 2,700 17,000 310 02/13/96 2623 -1700 000 2,200 13,000 2,200 9,700 78,000 -- 04/18/96 2376 -14 53 000 1,900 9,200 2,100 8,400 62,000 <500 08/08/96 2491 -15 68 000 730 2,500 970 2,900 15,000 <125 11/04/96 2528 -16 05 000 1,600 5,200 1,300 4,900 36,000 <250 73942Q1299T1 XLS Page 25