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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> Sequoia (9 1 6)921-9600 <br /> 4 FAX(916)921-0100 <br /> Ci) Analytical www sequoialabs Com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 4126100 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 4127100 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Re orted 5123/00 <br /> Miscellaneous AnalyseslQualtty Control <br /> Sequoia Analytical-Walnut Creek <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch OE23008 Date Prepared 5123100 Extraction Method General Pre <br /> Blank OE23008-BLK1 <br /> Methane 5123100 ND mg/1 5 D <br /> Butane ND so <br /> Propane " ND " 5 0 <br /> Ethane " ND 5 0 <br /> Pentane ND 5 0 <br /> Hexane ND 5 0 <br /> Duplicate OE23008-DUP1 S004376-01 <br /> Methane 5/23/00 ND ND mg/l 30 <br /> Butane ND ND 30 <br /> Propane ND ND 30 <br /> Ethane ND ND 30 <br /> PND ND '1 30 <br /> HO ND ND 30 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and def nations <br /> Page 7 of 8 <br />