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W <br />' TM <br /> Alpha Analytical Laboratories Inc 860 Waugh Lane, H 1, Ukiah, California 95482 <br /> (707) 468 0401 <br /> December 11, 1998 Page 1 <br /> Advanced Geo Environmental <br /> 4005 N Wilson Way <br /> Stockton, CA 95205 <br /> Quality Control Report <br /> Batch Number- 98-1204-004 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br />' Recovery Recovery Recovery RPD <br /> 01 0 <br /> 1 � <br /> Matrix: Soil <br /> Methyl Tertiary Butyl Ether ND 105 117 10 8 <br /> OU-TPGBTXE-S TPH Gasoline W/BTXE <br /> Benzene ND 93 . 1 99 . 2 6 . 34 <br /> • Benzene ND 106 107 939 <br /> Ethylbenzene ND 99 0 110 10 . 5 <br /> Ethylbenzene ND 82 0 80 .4 1 97 <br />' Toluene ND 99 1 108 8 59 <br /> Toluene ND 102 104 1 . 94 <br /> TPH - Gasoline ND 88 5 90 . 6 2 35 <br /> Xylenes ND 97 . 3 107 9 5 <br /> Xylenes ND 100 100 0 00 <br /> This Batch passes method quality control acceptance criteria <br /> ND = none detected <br />' Bruce L Gave <br /> . Laboratory Director Date Printed 12/11/98 <br /> 1 <br />