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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiser lane walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> fwll� Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> r <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264/ 980810-T1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thte Work Order# 9808910-03, 04 Reported Aug 31 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS082498MTSEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Duong <br /> MS/MSD # 980896204 <br /> Sample Conc N D <br /> Prepared Date 8/24/98 <br /> Analyzed Date 8/24/98 <br /> Instrument 1 D # H6 <br /> Conc Spiked 50 pg/L <br /> Result 47 <br /> MS % Recovery 94 <br /> Dun Result 46 <br /> MSD % Recov 92 <br /> RPD 22 <br /> RPD Limit 0-25 <br /> LCS -# LCS082498 <br /> Prepared Date 8/24/98 <br /> Analyzed Date 8/24/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 jug/L <br /> LCS Result 46 <br /> LCS % Recov 92 <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 /> WgMraSEQUOIA AN YTICAL preparation and analyticalmethods 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 /> r **MSaMatrix Spike MSD=MS Duplicate, RPD=Relative%Difference 9808910 BLA <6> <br />