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• 1 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ® Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Swte 8 Sacramento CA 95834 (916)921 9600 FAX(916)92I-0100 <br /> 3455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> Gettler Ryan/Geostrategies Client Prod ID Tosco 6981,4707 Pacific Ave Sampled 09/30/98 <br /> 3164 Gold Camp Drive #240 Sample Descript Eff Received 10/01/98 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 10/03/98 <br /> Attention Steve Carav Lab Number 9810112-02 Reported 10/06198 <br /> QC Batch Number GC100398BTEX03A <br /> Instrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 10 110 <br /> Methyl t-Butyl Ether 050 33 <br /> Benzene 010 25 <br /> Toluene 010 10 <br /> Ethyl Benzene 010 1 2 <br /> Xylenes (Total) 010 58 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 103 <br /> • <br /> I <br /> I <br /> I <br /> I <br /> i <br /> Analytes reported as N D were not present above the stated lima of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> I <br /> ranicher <br /> Project Manager Page 2 <br />