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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 Oct 31, 1992 <br /> 723 S St Sample Matrix Water Received Nov 2, 1992 <br /> Sacramento, CA 95814 Analysis Method EPA 5030/8015/8020 Reported Nov 9, 1992 <br /> Attention Steve Misner First Sample # 211-0026 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Limit I D. <br /> dig/L 211-0026 <br /> Tank <br /> Purceaoie <br /> Hydrocarbons 50 260 <br /> Benzene 050 20 <br /> Toluene 050 36 <br /> Ethyl Benzene 050 20 <br /> Total Xylenes 050 19 <br /> Chromatogram Pattern Gas <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 <br /> Date Analyzed 10/5/92 <br /> Instrument Identification HP-2 <br /> Surrogate Recovery, % - <br /> (OC Limits = 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 ANALYTIC <br /> Michael R Giles <br /> Laboratory Director <br /> 2110026 SRS <1> <br />