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` Sequoia 680 Chesapeake Drive Redwood Ory CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9.21-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CJI 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-8264/981124-J2 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Christine Lillie QC Sample Group 9811 H50 04 Reported Dec 11 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GC1207980HBPEXB <br /> Sample No 9812272 01 <br /> Date Prepared 1217198 <br /> Date Analyzed 1218198 <br /> Instrument I D # GCHP4A <br /> Sample Conc ug/L N D <br /> Conc Spiked, ug/L 1000 <br /> Matrix Spike ug/L 900 <br /> % Recovery 90 <br /> Matrix <br /> Spike Duplicate uglL 300 <br /> % Recovery 30 <br /> Relative % Difference 100 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK1207986S <br /> Date Prepared 12/7/98 <br /> Date Analyzed 1218198 <br /> Instrument I D # GCHP4A <br /> Conc Spiked, ug/L 1000 <br /> Recovery ug/L 830 <br /> LCS % Recovery 83 <br /> Percent Recovery Control Limits <br /> F- <br /> MSMSD 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 anafyvcal 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 fall within specified controi limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> gory <br /> t Manager <br />