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TABLE 13 <br /> MTBE CONCENTRATIONS IN GROUND WATER <br /> FLAG CITY CHEVRON <br /> 6421 Capital Avenue, Lodi, California <br /> Percentile for UCL of the Mean 95% <br /> Sample# Date/ Site MTBE Site$NW Area Regional <br /> Comment MTBE MTBE <br /> Anthmetic Mean - 50 903 92 705 50 421 <br /> Standard Deviation - 100 304 174 684 117 827 <br /> 5%confidence interval - 50 760 78 546 33 685 <br /> 95%UCL of the Mean - 101 663 171 251 84106 <br /> Number of samples - 15 19 47 <br /> MW-1 9/04-7105 025 025 025 <br /> MW-2 9/04-7105 105 105 105 <br /> MW-4 9/04-7105 227 227 227 <br /> MW-8A 9/04-7105 380 380 380 <br /> MW-9 9/04-7105 313 313 313 <br /> EW-1 9/04-7/05 14 14 14 <br /> EW-2 9/04-7105 33 33 33 <br /> EW-3 9/04-7105 025 025 025 <br /> EW-4 9/04-7105 41 41 41 <br /> EW-5 9/04-7105 15 1 5 1 5 <br /> EW-6 9104-7105 074 074 074 <br /> EW-7 9104-7105 110 110 110 <br /> EW-8 9104-7105 56 56 56 <br /> EW-9 9104-7105 46 46 46 <br /> EW-1 0 9104-7105 100 100 100 <br /> MW-19A 9104-7105 635 635 <br /> MW-1913 9/04-7/05 071 071 <br /> MW-20A 9/04-7105 360 360 <br /> MW20B 9104-7105 215 215 <br /> MW-5 9/04-7/05 045 <br /> MW-6A 9/04-7105 025 <br /> MW-6B 9104-7/05 255 <br /> MW-7 9/04-7/05 586 <br /> MW-11A 9/04-7/05 935 <br /> Mw-11B 9104-7105 325 <br /> MW-13B 9/04-7/05 331 <br /> MW-14 9/04-7105 555 <br /> MW-15 9/04-7/05 8625 <br /> MW-16 9/04-7/05 435 <br /> MW-17 9/04-7105 7575 <br /> MW-18 9104-7105 1475 <br /> MW-1 9/04-7105 3375 <br /> MW-2 9/04-7105 2106 <br /> MW-4 9/04-7105 2525 <br /> MW-5 9104-7105 14 <br /> MW-8A 9/04-7/05 7012 <br /> MW-813 9/04-7105 1 14 <br /> MW-8C 9/04-7105 055 <br /> MW-9A 9104-7105 1183 <br /> MW-913 9104-7105 41 <br /> MW-10A 9/04-7105 585 <br /> MW-10B 9/04-7105 119 <br /> MW-10C 9104-7105 543 <br /> MW-11A 9/04-7105 051 <br /> MW-11 B 9/04-7105 1 02 <br /> MW-11 C 9/04-7/05 1 23 <br /> MW-11 D 9/04-7/05 041 <br /> . Concentrations in Micrograms/Liters,averaged over four quarters <br /> Italized numbers= 1/2 non-detect(ND)values <br />