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f <br /> 1 ' <br /> Sequoia 690 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan Geostrategies --Client Prod ID Chevron 9-6171, Stockton — Sampled 05/10/98- ' <br /> 6747 Sierra Court Suite J Sample Descript MW-5 Received 05/11/98 <br /> Dublin, CA 94568 Matra LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 05/15/98 <br /> Attention Deanna Harding __—_ Lab Number 9805584-02_ _— _ Reyorted_06j02198__ <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 -- - 170 <br /> Methyi t-Butyl Ether 25 N D <br /> Benzene 050 .. .. -- -- 28 <br /> Toluene .... .. 050 .. .... .... 2.7 <br /> Ethyl Benzene .. .. 050 .. 2 6 <br /> Xylenes (Total) 050 ... 67 <br /> Chromatogram Pattern .. .. Gas <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 110 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01849 <br /> M�9�— <br /> egory <br /> project Manager Page 2 <br />