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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive + Redwood City, CA 94063 Q CT 0 1 1992 <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 3510/3520/8015 Reported Sep 30, 1992 <br /> Attention Cyril Yong First Sample# 209-3917 <br /> TOTAL EXTRACTABLE PETROLEUM HYDROCARBONS <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D. I D I.D. I D. I D. I D. <br /> erg/L 209-3917 <br /> A-1 <br /> Extractable <br /> Hydrocarbons 50 N D <br /> Chromatogram Pattern - <br /> i <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 <br /> Date Extracted 9/28/92 <br /> Date Analyzed 9/28/92 <br /> Instrument Identification GCHP-5 <br /> Extractable Hydrocarbons are quantitated against a fresh diesel standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> 4� itAA I <br /> Nokowhat D Herrera <br /> Project Manager 2oM17ALG <2> <br />