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/ \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> _ 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (5 10) 988 9673 <br /> Analytical 819 Striker Avenue Shite 8 Sacramento CA 95834 (916) 921 9600 FAX (9 t6) 921 0100 <br /> MPDS Services Client Project ID Tosco#5886 2701 W March Lane Stockton Sampled Dec 1, 1997 <br /> 2401 Stanwell Dr, Ste 300 Sample Matrix Water Received Dec 2 1997 <br /> Concord, CA 94520 Analysis Method EPA 3510/8015 Mor! Reported Dec 19, 1997 <br /> Attention Jarrel Crider First Sample # 712-0169 <br /> TOTAL EXTRACTABLE PETROLEUM HYDROCARBONS W/ Silica Gel Clean-Up <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D 1 D I D I D <br /> pg/L 712-0169 712-0170 712-0171 712-0172 712-0173 <br /> MW5S* MW6D* MW6S MW7D MW7S <br /> Extractable <br /> Hydrocarbons 50 55 140 N D N D N D <br /> Chromatogram Pattern Unidentified Unidentified <br /> Hydrocarbons Hydrocarbons <br /> >C15 >C15 <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 <br /> Date Extracted 12/5/97 12/5/97 12/5/97 12/5/97 12/5/97 <br /> Date Analyzed 12/9/97 12;9/97 12/9/97 12/10/97 12/9/97 <br /> Instrument Identification HP-3B HP-3B HP-3A HP-3A HP-3B <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, #1271 Please Note <br /> *This sample does not appear to contain diesel Unidentified Hydrocarbons >C15 <br /> Ignature on File refers to unidentified peaks to the total oil and grease range <br /> Alan B Kemp <br /> Project Manager <br /> 7120163 MPD <5> <br />