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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue, Suite a Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> FAttertion <br /> ch Seances Client Project ID Chevron 9-8264/9$0609-J1 <br /> gers Avenue <br /> , CA 95112 <br /> Fran Thie QC Sample Group 9806003-02-04 Reported .fun 24 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GC0617980HBPEXD <br /> Sample No 9806003-2 <br /> Date Prepared 6/17/98 <br /> Date Analyzed 6/18/98 <br /> Instrument I D # GCHP4A <br /> Sample Cone ug/L N D <br /> Cone Spiked, ug/L 1000 <br /> Matrix Spike, ug/L 830 <br /> % Recovery 83 <br />. Matrix <br /> Spike Duplicate ug/L 860 <br /> % Recovery 86 <br /> Relative '/o Difference 3 6 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK061798DS <br /> Date Prepared 6/17/98 <br /> Date Analyzed 6/18/98 <br /> Instrument I D # GCHP4A <br /> Cone Spiked uglL 1000 <br /> Recovery ug/L 820 <br /> LCS % Recovery 82 <br /> Percent Recovery Control Limits <br /> MSIMSD 50150 <br /> LCS 60 140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOI YTICAL preparation and analyticai methods empioyed for the samples The matrix spike is an aliquot of sample <br />. �/' fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> the recovery of analytes from the matrix spike daes not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> gory <br /> r t Manager <br />