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' ( \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 96b0 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Enviros Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 13 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#. MSO42197MTBEH6A <br /> Analy. Method- EPA 8240 <br /> Prep Method N A. <br /> Analyst L Zhu <br /> MS/MSD # 970458703 <br /> Sample Conc • N D <br /> Prepared Date. N A <br /> Analyzed Date 4/21/97 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 54 <br /> MS % Recovery los <br /> Dup Result 53 <br /> MSD % Recov 106 <br /> RPD 1 & <br /> RPD Limit, 0-25 <br /> LCS #. VMB042197S <br /> Prepared Date N A. <br /> Analyzed Date 4/21/97 <br /> Instrument I D # H6 <br /> Conc Spiked 50Ng/L <br /> LCS Result 54 <br /> LCS % Recov 108 <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 /> SEQUOIAANALYTICAL 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 /> Gregory "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager 9704512 EEE <20> <br />