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Ia- ft a <br /> Alpha Unalytical Laboratories Inc . 860 Waugh Lane, H 1, Ukiah, California 95482 <br /> (707) 468 0401 <br /> April 8 , 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 /> Batch Number: 96-1107-007 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> Matrix: Water <br /> Methyl Tertiary Butyl Ether NO 93 . 8 92 . 7 1. 18 <br /> OU-TPGBTXE-W TPH Gasoline W/BTXE <br /> Benzene NO 77 . 8 79 . 6 2 . 29 <br /> Ethylbenzene NO 99 . 9 104 4 . 02 <br /> Toluene ND 92 . 3 97 . 0 4 . 97 <br /> TPH - Gasoline ND 103 96. 0 7 . 04 <br /> Total Xylenes ND 105 108 2 . 82 <br /> Matrix: Soil <br /> Methyl Tertiary Butyl Ether ND 98 . 3 101. 2 . 71 <br /> OU-TPGBTXE-S TPH Gasoline C, BTXE <br /> Benzene ND 90 . 9 85. 8 5 .77 <br /> Benzene ND 87 . 9 83 . 8 4 .78 <br /> Benzene ND 89 . 5 91. 4 2 . 1 <br /> Ethylbenzene ND 114 108 5. 41 <br /> Ethylbenzene ND 88 . 0 84 . 8 3 .7 <br /> Ethylbenzene ND 105 106 . 948 <br /> Toluene NO 105 99 . 3 5. 58 <br /> Toluene ND 90 . 2 86. 8 3 . 84 <br /> Toluene NO 100 98 . 0 2 . 02 <br /> TPH - Gasoline ND 117 108 8 . 00 <br /> Xylenes NO 110 104 5. 61 <br /> Xylenes NO 92 . 6 90. 1 2 . 74 <br /> Xylenes NO 101 103 1. 96 <br /> (continued on next page) <br />