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SequoiaF 680 Chesapeake Drive Redwood Ccty CA 94063 (650)364-9600, FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(92S)988-9673 <br /> 819 StrLker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 rAX(916)921 0100 <br /> poxn <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 1071 North Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 4 - ' <br /> Attention Fran Thie Work Order# 9810727-01, 02 Reported Oct 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS101698MT13EH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst B Pitamah <br /> MS/MSD # 981074218 <br /> Sample Cone N D <br /> Prepared Date 10/16/98 <br /> 1 r <br /> Analyzed Date 10/16/98 - - - <br /> Instrument I D # H6 <br /> Cone Spiked 50pg/L i <br /> Result. 46 <br /> MS % Recovery 92 <br /> r <br /> Dup Result 49 <br /> MSD % Recov 98 ' <br /> RPD 63 <br /> RPD Limit o-25 <br /> LCS # LCS101698 <br /> Prepared Date 10/16/98 <br /> Analyzed Date 10/16/98 <br /> Instrument I D # HIS <br /> Cone Spiked 50jug/L <br /> LCS Result y_ _ 41 <br /> LCS% Recov 82 <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 /> 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 /> J�ZytPlenner <br /> Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9810727 BLA <2> <br />