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5 <br /> Table 3 Historic Groundwater Chemical Data, con't. <br /> Well No Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE <br /> -------------------------------- ug/l --------------------------------- <br /> MW-3 3/10197 ND ND ND ND ND ND <br /> MW-3 6/30/97 NO NO ND ND NO ND <br /> MW-3 8/20197 NO ND NO ND NO ND <br /> MW-3 12/10/97 ND ND NO ND ND ND <br /> MW-3 3/31198 ND NO NO ND ND ND <br /> MW-3 6/30/98 ND ND NO NO ND ND <br /> MW-3 9/29/98 ND NO NO ND NO ND <br /> MW-3 12/29/98 ND NO NO NO ND ND <br /> MW-3 3/29/99 ND ND ND ND ND ND <br /> MW-4 8/20/97 NO ND ND ND NO ND <br /> MW-4 12/10/97 ND NO NO ND ND ND <br /> MW-4 3131198 130 ND ND ND ND ND <br /> MW-4 6130/98 ND ND NO NO ND NO <br /> MW-4 9/29/98 ND ND ND ND NO ND <br /> MW-4 12/29/98 NO ND ND NO NO ND <br /> MW-4 3129/99 120 ND NO ND ND NO <br /> ND - None detected NA - Not Analyzed ug/l - micrograms per liter <br /> . ` - Samples not analyzed at RWQCB detection limits for this sampling event <br /> MTBE - Methyl-Tert-Butyl-Ether and fuel oxygenates by Method 8260 from 3/3198 forward <br /> no rept - laboratory had insufficient quantity to quantify TPHG <br /> 1,2-Dichloroethane was ND for all wells for 3/29/99 sampling <br />