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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytiea1 819 Striker Avenue Suite 8 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)792 0342 <br /> Gettler Ryan/Geostrategies Client Prol ID Unocal 6981, 140124 02 Sampled 07/30/98 <br /> 3164 Gold Camp Drive #240 Sample Descrlpt INF Received 07/31/98 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 08/01/98 <br /> Attention Steve Carter Lab Number 9807197-02 Reported 08f 14f98 <br /> QC Batch Number GC080198BTEX03A <br /> Instrument 1D GCHP3 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas - 100 720 <br /> Benzene 1 0 N D <br /> Toluene 1 0 N D <br /> Ethyl Benzene 1 0 44 <br /> Xylenes (Total) 1 0 14 <br /> Chromatogram Pattern <br /> Unidentified HC _ C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 121 <br /> Analytes reported as N D were not present above the stated itmit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> TWanicher <br /> Project Manager Page 2 <br />