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' Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 rAX(415) 364 9233 <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 Descnpt Eff 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 9704D69-02 Reported 04f29197 ! <br /> 1C Batch Number GC042597BTEX03A <br /> istrument 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 10 56 <br /> Benzene 010 N D <br /> Toluene 010 N D <br /> Ethyl Benzene 010 069 <br /> Xylenes (Total) 010 7.0 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 121 <br /> lalytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br /> Ilk gory <br /> roject Manager Page 2 <br />