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680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wigct Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> ,!D <br /> 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 t <br /> Analytical 1 <br /> Gettler Ryan/Geostrategies Client Proj ID Unocal 4855 18/6981 Stockton Sampled 12/05/97 <br /> 3164 Gold Camp Drive 7240 Sample Descript lnf Received 12/05/97 <br /> Rancho Cordova, CA 95670 Matrix AIR 08zed Anal 12 97 <br /> Analysis Method 8015Mod/8020 Y / / <br /> Reported 12J1 0/97 <br /> Attention Greg Gurss Lab Number 9712281-02 <br /> it <br /> t i= <br /> QC Batch Number 6C120897BTEX02A <br /> instrument 1D GCHP2 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 100 830 <br /> ND <br /> Benzene 1 0 N D <br /> Toluene 1 0 51 <br /> Ethyl Benzene - 1 0 53 <br /> Xylenes (Total) Gas <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 124 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 71210 <br /> Ae6eggory Page 2 <br /> Project Manager <br />