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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wcget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Gettler Ryan/Geostrategies Client Prod ID Unocal 4855 20/5981, Stockton Sampled 08/28/97 <br /> 3164 Gold Camp Drive #240 Sample Descript Inf Received 08/29/97 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 08/29/97 <br /> Attention Greg Gurss Lab Number 9708F33-02 Reported 09JO4197 <br /> QC Batch Number GCO82997BTEX21A <br /> Instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 100 980 <br /> Benzene 1 0 N D <br /> Toluene 1 0 N D <br /> Ethyl Benzene 10 15 <br /> Xylenes (Total) 1 0 160 <br /> Chromatogram Pattern <br /> Weathered Gas C8-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 84 <br /> 0 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01210 <br /> regory <br /> Pct Manager Page 2 <br />