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r <br /> 15) Sequoia 819 Striker Avenue Suite 8 <br /> 4 Sacramento CA 95834 <br /> (916921-9600 <br /> Analytical FAX(916)921-0 100 <br /> 1SECOR International-Sacramento Project ARCO 2093,Tracy,CA Sampled 2/16/00 <br /> 9912 Business Park Dr,Ste 100 Project Number 077 41928 190 Received 2/18/00 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 316/00 <br /> Miscellaneous Analyses/Quality Control <br /> Sequoia Analytical- Walnut Creek <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch OB23010 Date Prepared 2/23/00 Extraction Method General Prep <br /> Blank OB23010-BLK1 <br /> Methane 3/6100 ND mg/l 50 <br /> Butane ND 50 <br /> Propane ND 5 0 <br /> Ethane ND 5 0 <br /> Pentane ND 5 0 <br /> Hexane ND 5 0 <br /> Duplicate OB23010-DUP1 5002237-01 <br /> Methane 316100 ND ND mg/l 30 0 <br /> Butane ND ND 30 0 <br /> Propane ND ND 30 0 <br /> Ethane ND ND 30 0 <br /> Pentane ND ND 30 0 • <br /> Hexane ND ND 30 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions— <br /> Page <br /> efnitronsPage 7 of 8 <br />