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+ 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> 4pettler-Ryan, Inc Client Project ID Tosco #6981, Stockton Sampled Feb 24, 1999 <br /> 3164 Gold Camp Dr, Ste #240 Sample Matrix Air Received Feb 25, 1999 <br /> Rancho Cordova, CA 95670 Analysis Method EPA 5030/8015 Mod /8020 Reported Mar 11, 1999 <br /> Attention Steve Carter First Sample# 902-2390 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D I D <br /> pg/L 902-2390 902-2391 <br /> I of Eff <br /> Purgeable <br /> Hydrocarbons 10 510 18 <br /> Benzene 0 050 24 N D <br /> Toluene 0 050 1 6 N D <br /> Ethyl Benzene 0 050 N D N D <br /> Total Xylenes 0 050 2 4 N D <br /> Chromatogram Pattern Gasoline& Gasoline& <br /> Unidentified Unidentified <br /> Hydrocarbons Hydrocarbons <br /> <C16 >C8 <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 <br /> Date Analyzed 2/26/99 2/26/99 <br /> Instrument Identification HP-2 HP-2 <br /> Surrogate Recovery, % 161 98 <br /> (QC 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 /> Janne Fegley <br /> Project Manager <br /> 9022390 GGG <1> <br />