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MAY-09-99 TUE 03:08 PM ALPHA ANALYTICAL LABORAT FAX K0. 11312 P. 05/06 <br /> 1 <br /> 1 <br /> TM <br /> Alpha Analytical Laboratories Inc 860 Waugh Lane, H•1, Ukiah, California 95482 <br />' (707) 468 0401 <br /> May 4, 1999 Page 1 <br />' Advanced Geo Environmental <br /> 4005 N. Wilson Way <br /> Stockton, CA 95205 <br /> Quality Control Report <br />' Batch Number: 99-0428--006 <br />' Method Matrix Duplicate <br /> Blank spike Spike <br /> Recovery Recovery Recovery RPA <br />' Matrix; Water <br /> Methyl Tertiary Butyl Ether ND 93 . 2 93 . 2 0.00 <br /> OU-TPGBTXE-W TPH Gasoline W/BTXE <br /> I Benzene ND 100 94 . 8 5. 34 <br /> Ethylbenzene ND 95. 6 89.2 6 . 93 <br /> Toluene ND 94 . 8 92.8 2. 13 <br /> TPH - Gasoline ND 114 99. 3 1318 <br /> Total Xylenes ND 99 .9 90. 5 9. 87 <br /> IThis Batch passes method quality control acceptance criteria. <br /> ND = none detected <br /> grace L. Gove <br /> Laboratory Director Date Printed- 5/44/ <br />