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z <br /> . Table 3. Historic Groundwater Chemical Data, can't <br /> Well No Date TPHG Benzene Toluene Ethylbenzene Xylene MBTE <br /> ug/l --------------------------------- <br /> MW-3 12/10/97 NO NO NO NO NO ND <br /> MW-3 3131198 NO NO NO NO NO NO <br /> MW-3 6/30198 NO NO NO NO NO ND <br /> MW-3 9129198 NO NO NO NO NO NO <br /> MW-4 8/20/97 ND NO NO NO NO ND <br /> MW-4 12/10/97 NO NO NO ND NO ND <br /> MW-4 3/31/98 130 NO NO NO ND ND <br /> MW-4 6/30/98 NO NO NO NO NO NO <br /> MW-4 9/29/98 NO NO ND NO NO ND <br /> ND - None detected NA - Not Analyzed ug/I - 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 313198 forward <br /> no rept - laboratory had insufficient quantity to quantify TPHG <br /> Page 6 <br />