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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> 404 N WEget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792.0342 <br /> 1551 industrial!toad San Carlos CA 94070-4111 (650)232 9600 FAX(650)232 9612 <br /> Gettler-Ryan - Dublin Client Project ID Tosco 88#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=# -.904-1854— -- — <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 I D I D I D <br /> Mg/L 904-1854 9041855 904-1856 904-1857 904-1858 904-1859 <br /> TB-LB MW-1 MW-2 MW-4 MW-5 MW-6 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 1,700 N D N D N D <br /> Benzene 0 50 N D N D 440 N D N D N D <br /> Toluene 050 N D N D 20 N D N D N D <br /> Ethyl Benzene 050 N D N D 18 N D N D N D <br /> Total Xylenes 050 N D N D 57 N D N D N D • <br /> MTBE 2 5 N D 25 310 62 2 8 N D <br /> Chromatogram Pattern -- -- Gasoline -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 10 1 0 1 0 1 0 <br /> Date Analyzed 4/28/99 4/28/99 4/29/99 4/28/99 4/28/99 4/28/99 <br /> Instrument Identification HP-9 HP-9 HP-4 HP-9 HP-9 HP-9 <br /> Surrogate Recovery, % 88 91 92 90 90 90 <br /> PC 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 /> Janne Fegley Q <br /> Project Manager <br /> 9041854 GET <1> <br /> rP� <br />