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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 I <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Analytical <br /> F <br /> i <br /> 'n <br /> t tui tss,u �s s : s is s ' ss s s s at i° s td <br /> Gettler Ryan/Geostrategies Client Proj ID Unocal 4855 18/6981 Stockton Sampled 12/05/97 <br /> 3164 Gold Camp Drive #240 Sample Descript Eff Received 12/05/97 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 12/08/97 <br /> Attention Greg Gurss Lab Number 9712.281-01 Reported 12/10,/97 <br /> QC Batch Number GC120897BTEX21 A <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 10 N D <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 /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 84 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> e gory <br /> Project Manager Page 1 <br />