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Sequoia <br />IWO Analytical <br />819 Striker Avenue Suite 8 <br />Sacramento CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www sequoialabs cam <br />• <br />SECOR International - Rancho Cordova <br />Project <br />Chevron 9-5775, Lodi, CA <br />Sampled <br />6/23/00 <br />3017 Kilgore Road, Suite 100 <br />Project Number <br />077 41991 043 <br />Received <br />6126100 <br />Rancho Cordova, CA 95670 <br />Project Manager <br />David Evans <br />Reported <br />713, 6100 <br />MTBE Confirmation by EPA Method 8260A/Quality Control <br />Sequoia Analytical - Sacramento <br />Date Spike Sample QC Reporting Limit Recov RPD RPD <br />Analvzed Level Result Result Units Recov Limits % Limit % Notes* <br />Batch 0070015 <br />Date Prepared <br />713100 <br />Extraction Method EPA 5030B IMeOHl <br />Blank <br />0070015-BLK1 <br />tert-butyl ether <br />7/5/00 <br />KD <br />mg/kg <br />0 100 <br />_Methyl <br />Surrogate 1,2 -DCA -d4 <br />11250 <br />296 <br />600-140 <br />118 <br />LCS <br />0070015 -BSI <br />Methyl tert-butyl ether <br />715/00 <br />250 <br />220 <br />mg/kg <br />700-130 <br />880 <br />Surrogate 12-DC4-d4 <br />11250 <br />284 <br />600-140 <br />114 <br />Matrix Spike <br />0070015 -MSI <br />5006386-01 <br />Methyl cert -butyl ether <br />715100 <br />250 <br />0 979 <br />326 <br />mg/kg <br />60 0440 <br />912 <br />Surrogate 12 -DCA -d4 <br />to <br />250 <br />265 <br />600-140 <br />106 <br />Matrix Spike Dup <br />0070015-MSD1 <br />5006386-01 <br />Methyl tert-butyl ether <br />715100 <br />250 <br />0 979 <br />3 3 t <br />mg/kg <br />600-140 <br />932 250 217 <br />Surrogate 12 -DCA -d4 <br />" <br />250 <br />267 <br />if600-140 <br />107 ' <br />Sequoia Analytical - Sacramento *Refer to end of report for text of notes and definino <br />Page 5 of 6 <br />