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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(92 5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792 034Z <br /> Blaine Tech Services Client Project ID Chevron 9-82641980810-T1 <br /> 1680 Rogers Avenue <br /> San .lose, CA 95312 <br /> Attent-on Fran Tijc QC Sample Group 9808910 01 04 Reported Aug 31 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method £PA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO821980HBPEXA <br /> Sample No 9808853 1 <br /> Date Prepared 8120198 <br /> Date Analyzed 8122198 <br /> Instrument I D # GCHP5A <br /> Sample Cone ug/L 88 <br /> Cone Spiked ug/L 1000 <br /> Matrix Spike ug/L 960 <br /> % Recovery 87 <br /> Matrix <br /> Spike Duplicate uglL 1000 <br /> % Recovery 91 <br /> Relative % Difference 4 5 <br /> RPD Control Limits 0 50 <br /> LCS Batch# BLK082198AS <br /> Date Prepared 8121198 <br /> Date Analyzed 8/24198 <br /> Instrument I D # GCHP4A <br /> Cone Spiked ug/L 1000 <br /> Recovery ug/L 880 <br /> LCS % Recovery 88 <br /> Pe-cent Recovery Control Limits <br /> MSYMSD 50 150 <br /> 7 LCS 60 140 <br /> Quafity Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a controi sample of known interferent free matrix that is analyzed using the same reagents <br /> ,WLYTICAL preparation and analytical methods employed for the samples The matrix spike is an aiiquuot of sample <br /> tomfied 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 control limits due to matrsx <br /> interference the LCS recovery is to he used to validate the hatch <br /> r <br /> -moi <br />