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• Table 3 Historic Groundwater Chemical Data, con't. Well No Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE -------------------------------- ug/I --------------------------------- MW-3 3/28/96 ND ND ND ND ND NA MW-3 6/27196 ND ND ND ND ND NA MW-3 9123196 ND ND ND ND ND NA MW-3 12/19/96 ND ND ND ND ND ND MW-3 3/10/97 ND ND ND ND ND ND MW-3 6/30/97 ND ND ND ND ND ND MW-3 8120/97 ND ND ND ND ND ND MW-3 12/10/97 ND ND ND ND ND ND MW-3 3/31/98 ND ND ND ND ND ND MW-3 6/30/98 NO ND ND ND ND ND MW-3 9/29/98 ND ND ND ND ND ND MW-3 12/29/98 ND ND ND ND ND ND MW-3 3/29/99 ND ND ND ND ND ND MW-3 6130199 ND ND ND ND ND ND MW-3= 10/5/99 ND ND ND ND ND ND MW-3 1/27/00 ND ND ND ND ND ND MW-4 8120/97 ND ND ND ND ND ND MW-4 12/10/97 ND ND ND ND ND ND MW-4 3/31/98 130 ND ND ND ND ND MW-4 6130/98 ND ND ND ND ND ND MW-4 9/29/98 ND ND ND ND ND ND MW-4 12/29/98 ND ND ND ND ND ND MW-4 3/29/99 120 ND ND ND ND ND MW-4 6/30/99 ND ND ND ND NO ND MW-4 10/5/99 ND ND ND ND ND ND MW-4 1127/00 ND ND ND ND ND ND ND - None detected NA - Not Analyzed ug/l - micrograms per liter - Samples not analyzed at RWQCB detection limits for this sampling event MTBE - Methyl-Tert-Butyl-Ether and fuel oxygenates by Method 8260 from 3/3/98 forward no rept - laboratory had insufficient quantity to quantify TPHG 1,2-Dichloroethane was ND for all wells for 3/29/99 sampling _ - Very low VOC detected June, 1999 Page 7