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y s 1w <br /> Alpha Analytical Laboratories Inc. 0 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> (707) 468-0401 <br /> February 24 , 1998 Page 1 <br /> Kevin McKibben <br /> Advanced Geo Environmental <br /> 4005 N. Wilson Way <br /> Stockton, CA 95205 <br /> Quality Control Report <br /> Batch Number : 98-0217-005 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> Matrix: Soil 0 0 <br /> Lead ND 96 . 6 95 . 4 1 . 25 <br /> Methyl Tertiary Butyl Ether ND 84 . 7 83 . 5 1 . 43 <br /> OU-TPGBTXE-S TPH Gasoline W/BTXE <br /> Benzene ND 92 . 4 94 . 4 2 . 14 <br /> Benzene ND 111 109 1 . 82 <br /> Ethylbenzene ND 94 . 2 95 . 9 1 . 79 <br /> Ethylbenzene ND 89 . 2 93 . 2 4 . 39 <br /> Toluene ND 88 . 7 91 . 2 2 . 78 <br /> Toluene ND 93 . 6 96 . 0 2 . 53 <br /> TPH - Gasoline ND 94 . 8 89 . 7 5 . 53 <br /> Xylenes ND 98 . 0 99 . 9 1 . 92 <br /> Xylenes ND 95 . 7 99 . 7 4 . 09 <br /> This Batch passes method quality control acceptance criteria . <br /> ND = none detected <br /> Bruce L. Gove <br /> Laboratory Director Date Printed: 2/24/98 <br />