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Alpha W Analytical Laboratories Inc. <br />March 6, 1998 <br />Kevin McKibben <br />Advanced Geo Environmental <br />4005 N. Wilson Way <br />Stockton, CA 95205 <br />860 Waugh Lane, H-1, Ukiah, California 95482 <br />(707) 468.0401 <br />Quality Control Report <br />Batch Number: 98-0225-020 <br />Method <br />Blank <br />Recovery <br />Matrix: Soil <br />Methyl Tertiary Butyl Ether ND <br />OU-TPGBTXE-S TPH <br />Gasoline W/BTXE <br />Benzene <br />ND <br />Benzene <br />ND <br />Ethylbenzene <br />ND <br />Ethylbenzene <br />ND <br />Toluene <br />ND <br />Toluene <br />ND <br />TPH - Gasoline <br />ND <br />Xylenes <br />ND <br />Xylenes <br />ND <br />Page 1 <br />Matrix <br />Duplicate <br />Spike <br />Spike <br />Recovery <br />Recovery <br />RPD <br />01 <br />o <br />0 <br />106 <br />104 <br />1.9 <br />114 <br />111 <br />2.67 <br />108 <br />107 <br />.93 <br />90.0 <br />91.6 <br />1.76 <br />106 <br />104 <br />1.9 <br />98.8 <br />93.6 <br />5.41 <br />107 <br />106 <br />.939 <br />107 <br />111 <br />3.67 <br />94.8 <br />86.7 <br />8.93 <br />111 <br />109 <br />1.82 <br />This Batch passes method quality control acceptance criteria. <br />ND = none detected <br />Bruce L. Gove <br />Laboratory Director <br />Date Printed: 3/06/98 Afif <br />