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® Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 15) <br /> 404 N Wigct 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 Proj ID Unocal 6981, Stockton Sampled 04%24/97 <br /> 3164 Gold Camp Drive #240 Sample Descript Inf Received 04/25/97 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 04/25/97 <br /> Attention Steve Carter Lab Number 9704D69-01 Reported 04J29197 i <br /> QC Batch Number GC042597BTEX03A <br /> Instrument ID GCHP3 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 50 940 <br /> Benzene 0 50 N D <br /> Toluene 050 1 6 <br /> Ethyl Benzene 050 22 <br /> Xylenes (Total) 190 <br /> Chromatogram 050 Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 119 <br /> 0 <br /> ialytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br /> 46A 1 <br /> l egory <br /> oject Manager Pae t <br /> 9 <br />