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680 Chesapeake Drive Redwood City CA 94063 (650)364-9500 FAX(650)364-9233 <br /> .� Sequoia 404 N Wiget lane Walnut Creels.CA 94598 (925)988-9600 fAx(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (gib)921-9600 FAx(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> 7� <br /> Blaine Tech Services Client Project ID Chevron 9-20331990217-P1 <br /> 1680 Rogers Avenue <br /> San .lase, CA 95112 <br /> Attention Christine Lillie QC Sample Group 9902842-01 Reported Mar 5, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO223990HBPEXC <br /> Sample No 9902A21-02 <br /> Date Prepared 2123199 <br /> Date Analyzed 2124199 <br /> Instrument I D # GCHP5B <br /> Sample Cone ug/L N D <br /> Cone Spiked uglL 1000 <br /> Matrix Spike ug/L 840 <br /> % Recovery 84 <br /> Matrix <br /> Spike Duplicate, uglL 720 <br /> % Recovery 72 <br /> Relative % Difference 15 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK022399CS <br /> Date Prepared 2123199 <br /> Date Analyzed 2124199 <br /> Instrument I D # GCHP513 <br /> Cone Spiked ug/L 1000 <br /> Recovery, uglL 810 <br /> LCS % Recovery 81 <br /> Percent Recovery Control Limits <br /> MS/MSD 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 /> SEQUOIA YTICAL preparation and analytical methods employed 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 jf <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> LI interference the LCS recovery is to be used to validate the batch <br /> Mel Mel Shi <br /> Project Managie',— <br />