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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)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 Prol ID Unocal 6981, 4855 19 Sampled 09/28/97 <br /> 3164 Gold Camp Drive #240 Sample Descrlpt EFFL Received 09/29/97 <br /> Rancho Cordova, CA 95670 Matrix AIR ' <br /> Analysis Method 8015Mod/8020 Analyzed 09/30/97 <br /> Attention Steve Carter Lab Number 9709G57-02 Reported 10f 03J97 <br /> QC Batch Number GC093097BTEX17A - <br /> Instrument ID GCHP17 <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 /> Tnfluorotoluene 70 130 100 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> 4ory Page 2 <br />