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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)3649233 <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 /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX{707)792-0342 <br /> 1551 industrial Road San Carlos CA 94070 41 11 (650)232-9600 FAX{650)232-9612 <br /> 00ettler-Ryan-Dublin Client Project lf� Tosco#6981, Stockton Sampled Jun 19, 1999 <br /> 6747 Sierra Court, Suite J Sample Matrix Air Received Jun 21, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Jul 6, 1999 <br /> Attention Steve Carter First Sample# 906-1621 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX/ MTBE <br /> Reporting Sample Sample <br /> Analyte Limit i D I D <br /> pg/L 906-1621 906-1622 <br /> Inf Eff <br /> Purgeable <br /> Hydrocarbons 10 830 65 <br /> Benzene 0 050 32 0 30 <br /> Toluene 0 050 057 N D <br /> Ethyl Benzene 0 050 N D N D <br /> Total Xylenes 0 050 N D 0 10 <br /> MTBE 025 200 - <br /> Chromatogram Pattern Gasoline& Gasoline <br /> Unidentified <br /> Hydrocarbons <br /> C6 <br /> Quality Control Data <br /> Report Limit Multiplication Factor 5 0 1 0 <br /> Date Analyzed 6/21/99 6/21/99 <br /> Instrument Identification HP-2 HP-2 <br /> Surrogate Recovery, % 101 <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 Please Note <br /> * Surrogate recovery above control limit due to coelution <br /> lianne 1=egley <br /> Project Manager <br /> 9061621 GET <1 n <br />