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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> a— —N 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 8t9 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)79Z-0342 <br /> Gettler RyanlGeostrategies Client Proj ID �- Unocal SS#0123 Sampled 09/28/98 » <br /> 6747 Sierra Court Suite J Sample Descript U-4 Received 09/28/98 <br /> Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/07/98 <br /> Attention Deanna Harding Lab Number 9809H50-05 _ _ Reported 11J10198» » ,_ <br /> QC Batch Number GC100798BTEX17A <br /> Instrument ID GCHP17 <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 200 2200 <br /> Methyl t-Butyl Ether 10 17 <br /> Benzene 20 32 <br /> Toluene 20 N D <br /> Ethyl Benzene 2.0 45 <br /> Xylenes (Total) 2.0 17 <br /> Chromatogram Pattern <br /> Gas & Unidentified HC C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trlfl uorotoluene 70 130 97 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> Granicher <br /> rolect Manager Page 17 <br />