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f <br /> • Table 3. Historic Groundwater Chemical Data, con't <br /> Well No Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE <br /> -------------------------------- u g/I --------------------------------- <br /> MW-3 12/10/97 ND NO ND ND ND ND <br /> MW-3 3131198 ND NO ND ND ND ND <br /> MW-3 6/30198 ND NO ND ND ND ND <br /> MW-3 9/29/98 ND NO ND ND ND ND <br /> MW-3 12/29/98 ND NO ND ND ND ND <br /> MW-4 8/20/97 ND NO ND ND ND ND <br /> MW-4 12/10/97 ND NO ND ND ND ND <br /> MW-4 3/31/98 130 NO ND ND ND ND <br /> MW-4 6130/98 ND NO ND ND ND ND <br /> MW-4 9/29/98 ND NO ND ND ND ND <br /> MW-4 12/29/98 ND NO ND ND ND ND <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 3/3/98 forward <br /> no rept - laboratory had insufficient quantity to quantify TPHG <br /> 1,2-Dichloroethane was ND for all wells for 12/29/98 sampling <br /> Page 6 <br />