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4 <br /> 680 Chesapeake Drive Redwood city CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510),;W-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 6 Sacramento CA 95834 (916)921-9600 FAX(916)42t-0100 <br /> N-0 Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> settler Ryan/Geostrategles W — Client Prol ID Chevron 9-6171,Stockton Sampled 05/10/98 <br /> 1747 Sierra Court Suite J Sample Descript MW-0 Received 05/11/98 <br />]ublin, CA 94568 Matra LIQUID - <br /> Analysis Method 8015Mod/8020 Analyzed 05/15/98 <br />\ttention Deanna Harding Lab Number 9805584-03 _ _ y Reported 06/028 _ <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> 4nalyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 50 360 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene <br /> 050 N D <br /> 0 50 N D <br /> Toluene <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Unidentified HC .. .. .. C6-C12 <br /> Surrogates Control Limits% % Recovery <br /> T uorotoluene 70 130 110 <br /> lnalytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA A ALYTICAL - ELAP #1849 <br /> regory <br /> Dro]ect Manager Page 3 <br /> -OC4 <br />