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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> fr — Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-6171, 981118-Ki <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9811 D34-07 Reported Dec 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS112498MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 9811D3508 <br /> Sample Conc 34 <br /> Prepared Date 11/24/98 <br /> Analyzed Date 11/24/98 <br /> Instrument 1 D # H6 <br /> Conc Spiked 50Mg/L <br /> Result 52 <br /> MS % Recovery 97 <br /> IDDup Result 53 <br /> MSD % Recov 100 <br /> RPD 19 <br /> RPD Limit 0-25 <br /> LCS# LCS112398 <br /> Prepared Date 11/23/98 <br /> Analyzed Date 11/23/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 ug/L <br /> LCS Result 50 <br /> LCS % Recov 100 <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 />. SEQUOIA ANALYTICAL 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 /> egory <br /> r ect Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9811D34 BLA <3> <br />