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680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creck,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 7855 20 Sampled 07/31/97 i <br /> 3164 Gold Camp Drive #240 Sample Descrlpt Int Received 08/01/97 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 08/01/97 <br /> Attention Greg Gvrss Lab Number 9708032-01 Reported 08J05197 <br /> gf <br /> QC Batch Number GC080197BTEX21A <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 50 800 <br /> Benzene 050 N D <br /> Toluene 050 .. 0 68 <br /> Ethyl Benzene 050 - 21 <br /> Xylenes (Total) 050 190 <br /> Chromatogram Pattern .. Gas <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 75 <br /> 0• <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> egory <br /> ect Manager Page 1 <br />