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IW <br /> ' Alpha Analytical Laboratories Inc. 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> (707) 468-0401 <br /> May 13 , 1999 Page 1 <br /> Gary Dickenson <br /> ' Advanced Geo Environmental <br /> 4005 N. Wilson Way <br /> Stockton, CA 95205 <br /> Quality control Report <br /> ' Batch Number: 99-0507-018 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> ' Matrix: Water <br /> OU-TPGBTXE-W TPH Gasoline W/BTXE <br /> ' Benzene ND 90. 8 94 . 4 3 . 89 <br /> Ethylbenzene ND 85. 6 88. 4 3 . 22 <br /> Toluene ND 89 . 2 89. 6 . 447 <br /> TPH - Gasoline ND 97 . 8 94 . 5 3 . 43 <br /> ' Total Xylenes ND 89 . 1 91.7 2. 88 <br /> TPH -- Diesel ND 98 . 0 97 . 9 . 102 <br /> This Batch passes method quality control acceptance criteria. <br /> ND = none detected <br /> 1 _--� - <br /> Bruce L. Gwe <br /> Laboratory Director Date Printed: 5/13/99 <br />