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TM <br /> Alpha Analytical Laboratories Inc. a 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> (707) 468-0401 <br /> April 7, 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 : 98-0401-011 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> 0 i <br /> a <br /> Matrix: Soil o o 0 <br /> OU-TPGBTXE-S TPH Gasoline W/BTXE <br /> Benzene ND 87 . 9 101 13 . 9 <br /> Ethylbenzene ND 96 . 4 103 6 . 62 <br /> Toluene ND 95 . 6 103 7 . 45 <br /> TPH - Gasoline ND 103 96 . 1 6 . 93 <br /> Xylenes ND 96 . 9 103 6 . 1 <br /> This Batch passes method quality control acceptance criteria. <br /> ND = none detected <br /> Bruce L. Gove ��L V_ 7 ^- <br /> (((� <br /> Laboratory Director Date Printed: 4/07/98 <br />