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" 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia <br /> df 404 N Wiget lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Iwo Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 0 <br /> Blaine Tech Services, Inc Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9805F44-04-05 Reported Jun 11, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch#- MS052998MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst E Manuel <br /> MS/MSD # 980SH3102 <br /> Sample Cone. N D <br /> Prepared Date NA <br /> Analyzed Date 5/29/98 <br /> Instrument I D # H6 <br /> Cone Spiked. 50pg/L <br /> Result 49 <br /> MS % Recovery 98 <br /> 0 Dup Result 48 <br /> MSD % Recov .. 96 <br /> RPD 21 <br /> RPD Limit 0-25 <br /> LCS #' LCS052998 <br /> Prepared Date N A. <br /> Analyzed Date 5/29/98 <br /> Instrument 1.13 # H6 <br /> Cone Spiked 50Etg/L <br /> LCS Result 55 <br /> LCS % Recov 110 <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 /> DI A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> OF 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 /> ggy enner <br /> P Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9805F44 BLA <2> <br />