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• 680 Chesapeake Drive Redwood City CA 94063 (650)361-9600 FAX(650)3649233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(915)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(9 16)921-0 100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)791-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232 9600 FAX(650)131-9612 <br /> Pettler.Ryan - Dublin Client Project 11) 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 # 904-1860 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D l D I D I D <br /> ,ug/L 904-1860 904-1861 904-1862 904-1863 904-1864 904-1865 <br /> MW-7 MW-8 MW-9 MW-11 VW-1 VW-2 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D N D 3,400 <br /> Benzene 050 1 3 N D N D N D N D N D <br /> Toluene 050 N D N D N D N D N D N D <br /> Ethyl Benzene 050 N D N D N D N D N D N D <br /> .Total Xylenes 050 N D N D N D N D N D 53 <br /> MTBE 25 160 12 N D N D 52 78 <br /> Chromatogram Pattern - -- - -- -- Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 10 1 0 20 <br /> Date Analyzed 4/28/99 4/28/99 4/28/99 4/28/99 4/28/99 4/29/99 <br /> Instrument Identification HP-9 HP-9 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 92 91 96 95 98 99 <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 ANALYTICAL, #1271 <br /> tJlanne Fegley <br /> Project Manager <br /> 9041854 GET <2> <br /> 6X6 <br />