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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 ID Arco #2133, Stockton Sampled Nov 11, 1992 <br /> 723 S St Sample Matrix Water Received Nov 11, 1992 <br /> Sacramento, CA 95814 Analysis Method EPA 5030/8015/8020 Reported Nov 18, 1992 <br /> Attention Steve Tan First Sample # 211-0251 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Limit I D. <br /> pg/L 211-0251 <br /> Tank <br /> Purgeable <br /> Hydrocarbons 50 1 GO <br /> Benzene 050 096 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 1 2 <br /> Total Xylenes 050 12 <br /> Chromatogram Pattern Gas <br /> Qua!!!-Control Data <br /> Report Limit Multiplication Factor 1 0 <br /> I <br /> Date Analyzed 11/13/92 <br /> Instrument Identification HP-2 <br /> Surrogate Recovery, % 109 <br /> (OC Limtts = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> Michael R Giles <br /> Laboratory Director <br /> 2110251 BRS <1> <br />