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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 (925)988-%00 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> qwr Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br />• - <br /> [Attention <br /> lame Tech Services Client Project ID Chevron 9-203319$1109-T2 <br /> 680 Rogers Avenue <br /> an Jose, CA 95112 <br /> Christine Lillie QC Sample Group 9811696-01 Reported Nov 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GC1 120980HBPEXD <br /> Sample No 9811696-01 <br /> Date Prepared 11/20/98 <br /> Date Analyzed 11/24/98 <br /> Instrument 1 D # GCHP413 <br /> Sample Conc , ug/L 600 <br /> Conc Spiked, ug/L 1000 <br /> Matrix Spike, uglL 1500 <br /> % Recovery 90 <br /> Matrix <br /> Spike Duplicate, ug/L 1500 <br /> % Recovery 90 <br /> Relative % Difference 0 0 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK112098DS <br /> Date Prepared 11/20/98 <br /> Date Analyzed 11/24/98 <br /> Instrument I D # GCHP4B <br /> Conc Spiked, ug/L 1000 <br /> Recovery, ug/L 840 <br /> LCS % Recovery 84 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 50150 <br /> LCS 60140 <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 i:;analyzed using the same reagents <br /> SEQUQI AN LYTICAL 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 If <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> egory <br /> ct Manager <br />