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+ SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> Brown&Caldwell Client Project 10 Arco #434, Lodi Sampled Dec 14, 1992 <br /> 723 S St Sample Matrix Air Received Dec 15, 1992 <br /> Sacramento, CA 95814 Analysis Method EPA 5030/8015/8020 Reported Dec 17, 1992 <br /> Attention Steve Fan First Sample # 212-0471 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D. I D. <br /> mg/m3 212-0471 212-0472 <br /> Influent Effluent <br /> Purgeable <br /> Hydrocarbons 50 1800 N D <br /> Benzene 0 050 30 N D <br /> Toluene 0 050 150 N D <br /> Ethyi Benzene 0 050 24 N D <br /> Total Xylenes 0 050 160 N D <br /> Chromatogram Pattern Gasoline .. <br /> Quality Control Data <br /> Report Limit Multiplication Factor 50 10 <br /> Date Analyzed 12/15/92 12/15/92 <br /> Instrument IdentrIfication HP-2 HP-2 <br /> Surrogate Recovery, % 79 85 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analyles reported as N D were not detected above the stated reporting limit <br /> g,SECIUOIA ANALYTICAL <br /> 1/(,W/W <br /> Michael R Giles <br /> Laboratory Director <br /> 2120471 SRS <1 n <br />