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680 Chesapeake Drive Redwood City CA 94063 (650) 3649600 FAX(650)364-9233 <br /> Sequoia 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)921-0100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos CA 94070-411 1 (650) Z3Z-9600 FAX(650)23Z-9612 <br /> Gettler-Ryan - Dublin Client Project ID Unocal SS#2859, Stockton Sampled May 24, 1999 <br /> 6747 Sierra Court, Suite J Sample Matrix Water Received May 24, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported May 28, 1999 <br />—Attention Attention Deanna Harding—First Sample# - _905-2034_ ---- <br /> TOTAL <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 /> Ng/L 905-2034 905-2035 905-2036 905-2037 905-2038 905-2039 <br /> MW-6 MW-7 MW-8 MW-9 MW-10 NP-1 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D 56 130,000 1,600 <br /> Benzene 0 50 N D N D N D N D 9,200 43 <br /> Toluene 050 N D N D N D N D 38,000 21 <br /> Ethyl Benzene 050 N D N D N D N D 2,300 16 <br /> Total Xylenes 050 N D N D N D N D 18,000 210 <br /> MTBE 25 ND ND ND ND ND 32 <br /> Chromatogram Pattern -- Discrete Gasoline Gasoline <br /> Peaks <br /> 'Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1,000 2 0 <br /> Date Analyzed 5/26/99 5/26/99 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Instrument Identification HP-9 HP-9 HP-9 HP-9 HP-9 HP-9 <br /> Surrogate Recovery, % 90 90 92 108 97 80 <br /> (CC Limits = 70-130°/x) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> y <br /> ( 41-If <br /> II nne Feglev <br /> Manag <br /> 9052028 GET <2> <br />