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chem ENVIRONMENTAL LABORATORIES <br /> Mobile & In-House Laboratories Certified by State of California <br /> Phone (408) 955-9988 / FAX (408) 955-9538 <br /> QUALITY CONTROL RESULTS <br /> Client: Advanced GeoEnvironmental, Inc. <br /> 1803 West March Lane, Ste.A <br /> Stockton, CA 95207 <br /> Attn : Bob Marty <br /> Analysis : 8015M/TPH, 8020 BTEX <br /> Date of Analysis : 06/09/95 <br /> Laboratory Sample # : SD061395 . 1 <br /> Project Name : GEWEKE <br /> Sample Spike MS Rec . MSD Rec . Rel . <br /> Conc . Conc. #1 #2 Diff <br /> (ppm) (Ppm) (Ppm) M (ppm) ( % ) (% ) <br /> 8015M/TPH 0 750 659 . 5 88 809 108 20 <br /> Benzene 0 20 20 . 5 102 19 . 9 100 2 <br /> Toluene 0 20 19 . 5 98 20 . 2 101 3 <br /> Ethyl Benzene 0 20 20 . 1 100 19 . 9 100 0 <br /> Xylenes 0 60 57 . 8 96 61 . 1 102 6 <br /> Reviewed and approved by6 /7d ,Z <br /> Gefrge Tslra., L orabery Director <br /> 780 Montague Expressway, Suite 404, San Jose, CA 95131 <br />