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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N wiset Cane walnut Creek CA 94598 (925)988-%00 FAX(925)988-9673 <br /> Analytical 819 Sinker 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)792-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-42751980624-J1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9806G68-06 Reported Jul 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst <br /> ANALYTE Gasoline <br /> QC Batch # GC070198BTEX21A <br /> Sample No GW9806J19-02 <br /> Date Prepared 711198 <br /> Date Analyzed 711198 <br /> Instrument I D # GCHP21 <br /> Sample Conic , ug/L N D <br /> Cone Spiked ug/L 250 <br /> Matrix Spike ug/L 210 <br /> % Recovery 84 <br /> Matrix <br /> Spike Duplicate ug/L 210 <br /> % Recovery 84 <br /> Relative % Difference 00 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK070198AS <br /> Date Prepared 711198 <br /> Date Analyzed 711198 <br /> Instrument I D # GCHP21 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery ug/L. 210 <br /> LCS % Recovery 84 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br /> LCS 70 130 <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 /> VSEQUOYTICAL preparation <br /> 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 fall within specified control limas due to matrix <br /> interference the LCS recover is to be used to ialidate the batch <br /> ger <br />