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SEQUOIA ANALYTICAL OCT 0 1 19u, <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> . (415) 364-9600 • FAX (415) 364-9233 <br /> Alton Geoscience, Inc Client Project ID 30-0140-10, Mobil, 2375 Tracy Blvd Sampled Sep 24, 1992 <br /> 5870 Stoneridge Dr, Suite 6 Sample Matrix Water Received Sep 24, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Reported Sep 30, 1992 <br /> Attention Cyril Yang First Sample # 209-3917 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I.D. I D I.D. <br /> Ng/L 209-3917 <br /> A-1 <br /> Purgeable <br /> Hydrocarbons 50 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> . Ethyl Benzene 0 50 N D <br /> Total Xylenes 0 50 N D <br /> Chromatogram Pattern -- <br /> Quality Control Data <br /> Report Limn Multiplication Factor 10 <br /> Date Analyzed 9/28/92 <br /> Instrument Identil'ication GCHP-6 <br /> Surrogate Recovery, % 99 <br /> (OC Limits = 70-130%) <br /> Purgeabte 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 /> A V-k 4--- <br /> Nokowhat D Herrera <br /> Project Manager 20917.ALG 1 n <br />