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TABLE 1 (continued) Casing Depth Groundwater LPH Concentration(pg/L.) Well Elevation to Water Elevation Thickness Ethyl- No Date ft msl) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE RW3 04/30/92 889 3227 -2334 006 Not sampled-LPH 08/13/92 3467 -2550 039 Not sampled-LPH 10/08/92 3536 -2606 056 Not sampled-LPH 02/23/93 3134 -2245 000 4,100 4,300 1,600 8,300 47,000 -- 05/18/93 3002 -21 13 000 19,000 22,000 3,100 17,000 90,000 -- 08/22/93 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 -- 12/30/93 2963 -2074 000 18,000 22,000 2,900 15,000 96,000 -- 02/17/94 2927 -2038 000 9,600 14,000 2,200 9,600 70,000 -- 05/10/94 2991 -1992 000 10,000 16,000 2,200 10,000 76,000 -- 08/02/94 3035 -2146 000 -- -- -- -- -- -- 11/01/94 3059 -2170 000 11,000 16,000 2,800 14,000 92,000 - 02/17/95 2808 -19 19 000 9,800 12,000 2,600 11,000 79,000 -- 05/11/95 2537 -1648 000 7,600 10,000 2,700 12,000 90,000 -- 08/24/95 2672 -17 83 000 9,600 15,000 4,600 20,000 100,000 -- 10/19/95 2705 -18 16 000 7,000 12,000 3,400 14,000 87,000 <1,000 02/13/96 24 84 -15 95 000 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 2360 -1471 000 4,200 5,900 2,600 12,000 58,000 <1,250 11/04/96 2394 -15 05 000 4,300 4,300 2,600 11,000 67,000 <250 02/03/97 -- -- -- -- -- -- -- -- -- 05/08/97 Converted to UVB well RW4 01/30/91 9 23 3480 -2557 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 -- 10/15191 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 36 18 -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 -- XLS73942 Q398 T1 I Pige 20