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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650}364.9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)9Z1-0100 <br /> Analytical 1455.Mr-Dowell Blvd forth Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232_9612. <br /> Gettler-Ryan- Dublin Client Project ID Tosco SS#6981, Stockton Sampled Apr 19-20, 1999 <br /> 6747 Sierra Court, Suite J Sample Matrix Water Received Apr 21, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported May 14, 1999 <br /> Attention -Deanna Harding=— First Sample # -_-=904-1866 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX/ MTBE <br /> Reporting Sample Sample Sample <br /> Analyte Limit I D I D 1 D <br /> erg/L 904-1866 904-1867 904-1868 <br /> VW-3 VW-4 PTW-1 <br /> Purgeable <br /> Hydrocarbons 50 N D 14,000 N D <br /> Benzene 050 N D N D N D <br /> Toluene 050 N D N D N D <br /> Ethyl Benzene 050 N D 82 N D <br /> Total Xylenes 050 N D 170 N D <br /> MTBE 25 780 N D 42 <br /> Chromatogram Pattern -- Gasoline -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 100 1 0 <br /> Date Analyzed 4/29/99 4/29/99 4/28/99 <br /> Instrument Identification HP-9 HP-2 HP-2 <br /> Surrogate Recovery, % 92 101 95 <br /> (QC Limits - 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N b were not detected above the stated reporting limit <br /> SEQUOIA ANAL [CAL, #1271 <br /> Ilanne Fegley <br /> Project Manager <br /> 9041854 GET <3> <br /> r�i <br />