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qo <br /> equia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> SJ404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-oloo <br /> J Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • 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 9902E25-02,04 Reported Mar 19, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst TLP <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC030899BTEX02A <br /> Sample No GW9902D38-12 <br /> Date Prepared 318199 318199 318199 3/8/99 <br /> Date Analyzed 318199 318199 318199 318199 <br /> Instrument I D# GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Conc , ug1L N D N D N D N D <br /> Conc Spiked, uglL 10 10 10 30 <br /> Matrix Spike uglL 9 3 88 8 8 26 <br /> % Recovery 93 88 88 88 <br /> Matrix <br /> Spike Duplicate, uglL 9 4 8 9 8 9 27 <br /> % Recovery 94 89 89 90 <br /> Relative % Difference 1 1 1 1 1 1 2 2 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC030899BTEX02 <br /> Date Prepared 318199 318199 3/8/99 318199 <br /> Date Analyzed 318199 318199 318199 318199 <br /> iInstrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 2 92 92 28 <br /> LCS % Recovery 92 92 92 92 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70-130 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 /> I 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> aya, Kimyal <br /> Project Manager <br /> I <br />