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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 /> a 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical ical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> J 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Cambria Client Project ID Shell 341 Main St , Ripon <br /> 1144 65th St Suite C <br /> Oakland, CA 94608 <br /> Attention Owen Ratchye QC Sample Group 9902E25-01,06-07 Reported Mar 19, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst TLP <br /> ANALYTE Gasoline <br /> QC Batch # GC030799BTEX03A <br /> Sample No GW99021306-01 <br /> Date Prepared 3/7/99 <br /> Date Analyzed 3/7/99 <br /> Instrument I D # GCHP03 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike ug/L 270 <br /> % Recovery 10$ <br /> Matrix <br /> Spike Duplicate ug/L 260 <br /> % Recovery 104 <br /> I <br /> Relative % Difference 38 <br /> RPD Control Limits 0-25 <br /> ILCS Batch# GC030799BTEX03A <br /> Date Prepared 3/7/99 <br /> Date Analyzed 3/7/99 <br /> Instrument I D # GCHP03 <br /> Conc Spiced, ug/L 250 <br /> LCS Recovery ug/L 280 <br /> LCS % Recovery 110 <br /> Percent Recovery Control Limits <br /> F- <br /> msimso 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 /> �EQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> K fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> e <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kayvan Kirnyai <br /> Project Manager <br />