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Sequoia ... <br /> 80 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Wainut Creek CA 94598 (925)988-%00 FAX(925)988-9673 <br /> 4II,4DD- Analytical 819 Striker Avenue Suae 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> • 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707) 792-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8632/ 980810-T2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9808853-02, 03 Reported Aug 31, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> CSC Batch# MS0820981VITBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Duong <br /> MS/MSD # 9808A1301 <br /> Sample Conc ND <br /> Prepared Date 8/20/98 <br /> Analyzed Date 8/20/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50Ng/L <br /> Result 50 <br /> IOMS % Recovery 100 <br /> Dup Result 51 <br /> MSD % Recov 102 <br /> RPD 20 <br /> RPD Limit 0-25 <br /> LCS # LCS082098 <br /> Prepared Date 8/20/98 <br /> Analyzed Date 8/20/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50ug/L <br /> LCS Result 44 <br /> LCS % Recov 88 <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 /> OEQUOIA 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 fail within specified control limits due to matrix <br /> / Interference the LCS recovery Is to be used to validate the batch <br /> regory <br /> /P ect Manager **MS=Matrix Spike MSD=MS Duplicate RPD=Relative% Difference 9808853 BLA <2> <br />