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+ f 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> AAnalytical <br /> 7 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> naly}Lica 1 l 1455 McDowell Blvd North Ste b 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 /> Waine Tech Services, Inc Client Project ID Shell 107 North Main Street <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9901E85-01-03 Reported Feb 22, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS020999826OS2B <br /> Analy Method, EPA 8260 <br /> Prep Method- EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9020288 <br /> Sample Cone N D <br /> Prepared Date 2/10/99 <br /> Analyzed Date 2/10/99 <br /> Instrument I D# GCMS2 <br /> Cone Spiked 50 ug/L <br /> Result 55 <br /> MS % Recovery 110 <br /> Dup Result 58 <br />. MSD % Recon 116 <br /> RPD 53 <br /> RPD Limit 0-25 <br /> LCS# LGS020999 <br /> Prepared Date 2/9/99 <br /> Analyzed Date 2/9/99 <br /> Instrument I D # GCMS2 <br /> Cone Spiked 50 erg/L <br /> LCS Result 58 <br /> LCS % Recov 116 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#1271 preparation,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 /> t , 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-Klm)(w�� <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9901E85 BLA <4> <br />