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4 Table 3 Historic Groundwater Chemical Data Well No Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE -------------------------------- ug/I ---------------- ---------------- MW-1 12/5/94' 48,000 2100 510 1900 3000 NA MW-1 4/3/95 82,000 380 150 310 620 NA MW-1 6/16/95 46,000 160 130 110 200 NA MW-1 9/14/95 .28,000 240 31 130 160 NA MW-1 12/26/95 .35,800 8000 2100 9000 1800 NA MW-1 3/28/96 34,000 51 20 34 50 NA MW-1 6/27/96 28,000 110 39 80 130 NA MW-1 9/23/96 36,000 110 39 73 97 NA MW-1 12/19/96 60,000 180 81 110 150 NO MW-1 3/10197 16,000 86 17 37 49 ND MW-1 6130197 38,000 110 20 82 100 NO MW-1 8/20197 13,000 17 43 22 27 NO MW-1 12/10/97 no rept 530 55 350 440 ND MW-1 3/31/98 _ 9,000 1 ,400 130 880 500 ND MW-1 6/30/98 9,100 860 150 1,000 940 NO MW-1 9/29/98 8,400 960 92 860 580 NO MW-1 12/29/98 9,100 910 150 990 840 NO MW-1 3/29/99 13,000 790 140 1,000 900 NO MW-1 Well Destroyed June, 1999 MW-2 12/5194' <200 NO ND ND ND NA MW-2 4/3/95 ND NO ND ND ND NA • MW-2 6116/95 ND ND ND ND ND NA MW-2 9/14195 ND ND ND ND ND NA MW-2 12/26/95 ND ND ND ND ND NA MW-2 3/38/96 ND ND ND ND ND NA MW-2 6/27/96 ND ND ND ND NO NA MW-2 9/23196 ND ND NO ND ND NA MW-2 12/19/96 ND ND NO ND ND ND MW-2 3/10/97 ND ND NO ND ND NO MW-2 6/30/97 ND ND ND NO ND NO MW-2 8/20/97 ND ND ND NO NO NO MW-2 12/10/97 ND ND ND ND ND 59 MW-2 3/31/98 ND NO ND ND ND NO MW-2 6/30198 ND NO ND ND ND ND MW-2 9129198 ND NO ND ND ND ND MW-2 12/29/98 ND NO ND ND ND ND MW-2 3129199 ND ND ND ND ND NO MW-2= 6130199 NO ND ND ND ND NO MW-3 12/5/94' <200 ND ND ND ND NA MW-3 413195 ND ND NO ND ND NA MW-3 6/16/95 NO ND ND ND ND NA MW-3 9/14195 ND ND ND ND ND NA MW-3 12/26/95 ND ND NO NO ND NA MW-3 3/28/96 ND ND NO ND ND NA MW-3 6/27/96 ND ND ND NO ND NA MW-3 9123196 ND ND ND ND NO NA MW-3 12/19/96 ND NO ND ND NO ND Page 6