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+ / \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget 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 Chevron 9-6171, Stockton Sampled 07/20/97 <br /> 6747 Sierra Court Suite G Sample Descript MW-6 Received 07/22/97 <br /> Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method 8015Mod/6020 Analyzed 07/24/97 <br /> Attention Deanna Harding Lab Number 9707B37-02 Reported 07131197 <br /> jC Batch Number GC072497BTEX03A <br /> nstrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 50 120 <br /> Methyl t-Butyl Ether .. 25 - 23 <br /> Benzene 0 50 .. 0 94 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 079 <br /> Chromatogram Pattern. Gas <br /> Discrete Peak C7-C8 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 101 <br /> • <br /> knaiytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA A LYTICAL - ELAP #1210 <br /> M1Vegory <br /> ProManager Page 2 <br />