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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)3649233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX 510) 988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton / 980129-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9801 H81-05, 07-09, Reported Feb 13, 1998 <br /> 9801 H84-01-06 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS020998MTBEF2A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Duong <br /> MS/MSD# 9801HS108 <br /> Sample Conc NO <br /> Prepared Date 2/9/98 <br /> Analyzed Date 2/0/98 <br /> Instrument I D # F2 <br /> Conc Spiked 50pg/L <br /> Result 44 <br /> MS % Recovery 88 <br /> Dup Result 44 <br /> MSD % Recov 88 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LC8020998 <br /> Prepared Date 2/9/98 <br /> Analyzed Date 2/9/98 <br /> Instrument I D # F2 <br /> Conc Spiked 50 ug/L <br /> LCS Result 42 <br /> LCS % Recov 84 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br />�S Pr <br /> ALYTICAL 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 /> 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 /> eggy P jecger **MS=Matrix Spike, MSD=IVIS Duplicate, RPD=Relative%Difference 9801H79 SLA <11> <br />