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r 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Gettler Ryan/Geostrategles Client Proj ID Unocal 6981, 140124 04 Sampled 08/27/98 <br /> 6747 Sierra Court Suite J Sample Descript Eff Received 08/28/98 <br /> Dublin, CA 94568 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 08/29/98 <br /> Attention Steve Carter Lab Number 98081-151-02 Reported 09J08198 „ <br /> QC Batch Number GCO82998BTEX03A <br /> Instrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L. ug/L <br /> TPPH as Gas 10 47 <br /> Benzene 010 N D <br /> Toluene 010 N D <br /> Ethyl Benzene 010 N D <br /> Xylenes (Total) 010 N D <br /> Chromatogram Pattern <br /> Gas & Unidentified HC >C10 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 102 <br /> • <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> ranlcher <br /> Project Manager Page 2 <br />