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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(654)364 9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Str,kerAvenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9ZI-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX 1707)792-0342 <br /> Oettler-Ryan, Inc Client Project ID Tosco#6981, Stockton Sampled Mar 22, 1999 <br /> 3164 Gold Camp Dr , Ste #240 Sample Matrix Air Received Mar 23, 1999 <br /> Rancho Cordova, CA 95670 Analysis Method EPA 5030/8015 Mod /8020 Reported Apr 12, 1999 <br /> Attention Steve Carter First Sample # 903-2107 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample <br /> Analyte Limit f D <br /> µg/L 903-2107 <br /> INFLUENT <br /> Purgeable <br /> Hydrocarbons 10 920 <br /> Benzene 0 050 11 <br /> Toluene 0 050 054 <br /> Ethyl Benzene 0 050 073 <br /> is Total Xylenes 0 050 51 <br /> MTBE 025 36 <br /> Chromatogram Pattern Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 <br /> Date Analyzed 3/23/99 <br /> Instrument Identification HP-2 <br /> Surrogate Recovery, % 90 <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 <br /> 0 <br /> J II nne Fegley <br /> P oject Manager <br /> 9032107 GGG <4> <br />