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♦1 ti I Table 3. Historic Groundwater Chemical Data Well No Date TPHG Benzene Toluene Ethylbenzene Xylene METE ug/l MW-1 1215194' 48,000 2100 510 1900 3000 NA MW-1 4/3195 82,000 380 150 310 620 NA MW-1 6116195 46,000 160 130 110 200 NA MW-1 9114195 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 9/23196 36,000 110 39 73 97 NA MW-1 12/19/96 60,000 180 81 110 150 NO MW-1 3110197 16,000 86 17 37 49 NO MW-1 6130197 38,000 110 20 82 100 NO MW-1 8120197 13,000 17 4 3 22 27 NO MW-1 12/10/97 no rept 530 55 350 440 NO MW-2 1215/94" <200 NO NO NO NO NA MW-2 413/95 NO NO NO NO NO NA MW-2 6/16/95 NO NO NO NO NO NA MW-2 9114195 NO NO ND NO NO NA MW-2 12/26/95 NO NO NO NO NO NA MW-2 3/38/96 NO NO NO NO NO NA MW-2 6/27/96 NO NO NO ND NO NA MW-2 9123/96 NO NO NO NO NO NA MW-2 12/19/96 NO NO NO NO NO NO MW-2 3110197 NO NO NO NO NO NO MW-2 6/30/97 NO NO NO NO NO NO MW-2 8/20/97 NO NO NO NO NO NO MW-2 12/10/97 NO NO NO NO NO 59 MW-3 1215194• <200 NO NO ND NO NA MW-3 413/95 NO NO NO NO NO NA MW-3 6116195 NO NO NO NO NO NA MW-3 9114/95 NO NO NO NO NC NA MW-3 12/26/95 NO NO NO NO NO NA MW-3 3/28/96 NO NO NO NO NO NA MW-3 6127196 NO NO NO NO NO NA MW-3 9123196 NO NO NO NO NO NA MW-3 12/19/96 NO NO NO NO NO NO MW-3 3110/97 NO ND NO NO NO NO MW-3 6/30197 NO NO NO NO NO NO MW-3 8/20/97 NO NO NO NO NO NO MW-3 12/10/97 NO NO NO NO NO NO MW-4 8/20/97 NO ND NO NO NO NO MW-4 12/10/97 NO NO NO ND NO NO NO-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 begins with the 8/20/97 event no rept - laboratory had insufficient quantity to quantify TPHG