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Alpha Analytical Laboratories Inc. 860 Waugh Lane, H 1, Ukiah, California 95982 <br /> (707) 468.0401 <br /> August 21, . 1997 page 1 <br /> Bill Little <br /> Advanced Geo Environmental <br /> 1803 W March Ln, #A <br /> Stockton, CA 95207 <br /> Quality Control Report <br /> s <br /> Batch Number: 97-0814-002 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> o0 0 <br /> Matrix: Water <br /> Methyl Tertiary Butyl Ether ND 69 . 4 72 . 0 3 . 68 <br /> i; <br /> OU-TPDBTXE--W TPH Diesel W/BTXE• { <br /> Benzene ND 85 . 5 86 . 3 . 931 <br /> Ethylbenzene ND 87 . 8 89 . 8 2 . 25 <br /> Toluene ND 91 . 4 93 . 1 1 . 84 <br /> TPH - Diesel ND 79 . 9 86 . 1 7 .47 <br /> Total Xylenes ND i 88 . 8 89 . 9 1 . 23 <br /> Matrix: Soil <br /> Methyl Tertiary Butyl. Ether ND .106 102 3 . 85 <br /> r <br /> OU-TPDBTXE-S TPH Diesel W/BTXE <br /> Benzene ND :_118 115 2 . 58 <br /> Ethylbenzene ND 113 110 2 . 69 <br /> Toluene ND :'118 115 2 . 58 <br /> TPH -- Diesel ND 85 . 2 88 . 2 3 . 46 <br /> Xylenes ND 114 111 2 . 67 <br /> This Batch passes method quality control acceptance criteria. <br /> ND = none detected <br /> Bruce L. Cove <br /> Laboratory Director Date Printed: 8/21/97 <br />