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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-OtOO <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i <br /> Ge#tler Ryan/Geostrategies Client Prol ID Tosco SS#6981,180138 85 -- Sampled-05/27/98 =, <br /> 6747 Sierra Court Suite J Sample Descript MW-6 Received 05/28/98 <br /> Dublin, CA 94568 Matrix LIQUID -, <br /> Analysis Method 8015Mod/8020 Analyzed 06/04/98 <br /> Attention Deanna Harding _ Lab Number 9805H47-06 Reported 07J24198 <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 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 80 <br /> 0 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1849 <br /> TPranlcher <br /> P ct Manager Page 11 <br />