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Alpha Analytical Laboratories Inc a 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> (707) 468-0401 <br /> April 29, 1999 Page 1 <br /> Advanced Geo Environmental <br /> 4005 N Wilson Way <br /> Stockton, CA 95205 <br /> Quality Control Report <br /> Batch Number 99-0421-020 <br /> Method Matrix Duplicate <br /> Blank Spike Spike <br /> Recovery Recovery Recovery RPD <br /> % <br /> Matrix Water <br /> OU-TPGBTXE-W TPH Gasoline W/BTXE <br /> Benzene ND 98 . 8 96 0 2 87 <br /> Ethylbenzene ND 96 0 89 6 6 9 <br /> Toluene ND 98 4 92 0 6 72 <br /> TPH - Gasoline ND 80 . 8 85 3 5 42 <br /> Total Xylenes ND 98 4 91 . 5 7 27 <br /> Matrix Soil <br /> OU-TPGBTXE-S TPH Gasoline W/BTXE <br /> Benzene ND 95 . 0 96 4 1 46 <br /> Benzene ND 95 2 100 4 92 <br /> Benzene ND 61 6 70 . 8 13 9 <br /> Benzene ND 103 104 966 <br /> Ethylbenzene ND 106 108 1 87 <br /> Ethylbenzene ND 80 4 87 2 8 11 <br /> Ethylbenzene ND 62 4 68 .4 9 17 <br /> Ethylbenzene ND 113 111 0 00 <br /> Toluene ND 99 8 100 2 <br /> Toluene ND 90 4 98 0 8 07 <br /> Toluene ND 63 6 70 0 9 58 <br /> Toluene ND 105 105 0 00 <br /> TPH - Gasoline ND 92 . 5 99 . 0 6 79 <br /> TPH - Gasoline ND 107 110 2 76 <br /> Xylenes ND 107 108 . 93 <br /> Xylenes ND 86 9 94 7 8 . 59 <br /> Xylenes ND 75 9 75 5 528 <br /> {continued on next pagel <br />