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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)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Slvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Blaine Tech Serv,ces Client Project ID Chevron 9-42751980624-J1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thte QC Sample Group 9806G68-11 Reported All 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N Herrera <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO63098STEX21A <br /> Sample No GW9806HO3-12 <br /> Date Prepared 6/30/98 6130/98 6130198 6130198 <br /> Date Analyzed 6/30/98 6130/98 6130198 6130/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Cone ug/L N D N D N D N D <br /> Cone Sptked ug/L 10 10 10 30 <br /> Matrix Sptke ug/L 11 10 10 31 <br /> % Recovery 106 100 100 102 <br /> Matrix <br /> Spike Duplicate ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> i <br /> Relative % Difference 3 7 9 5 9 5 7 5 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK063098ABS <br /> Date Prepared 6/30/98 6/30/98 6130198 6/30/98 <br /> Date Analyzed 6130/98 6130/98 6/30/98 6130/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L 11 10 10 31 <br /> LCS % Recovery 110 100 100 103 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60 140 <br /> 17 LCS 70130 70130 70130 70130 <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 /> tSE,rICALQEJDIA AN preparation and analytical methods employed far the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire anaiyticai 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 /> ger <br />