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i <br /> • TM <br /> IWAlpha Analytical Laboratories Inc 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> (707) 468-0401 <br /> December 23, 1998 Page 1 <br /> Kevin McKibben <br /> Advanced Geo Environmental <br /> 4005 N. Wilson Way <br /> Stockton, CA 95205 <br /> Quality Control Report <br /> IBatch Number: 98--1218-012 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> Matrix: Water <br /> Methyl Tertiary Butyl Ether ND 86.4 88 . 4 2 . 29 <br /> OU-TPGBTXE--W TPH Gasoline W/BTXE <br /> lieBenzene ND 94 . 8 89. 2 6. 09 <br /> Ethylbenzene ND 95. 2 89 . 2 6 . 51 <br /> Toluene ND 98 .8 92 . 8 6 . 26 <br /> I TPH -- Gasoline ND 96 . 0 92 . 0 4 . 26 <br /> Total Xylenes ND 95 .7 92 . 9 2 . 97 <br /> This Batch passes method quality control acceptance criteria. <br /> ND = none detected <br /> I <br />' Bruce L Gove � <br /> 0 Laboratory Director Date Printed 12/23/98 <br />