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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-%00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Y1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/980624-J1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9806G68-02 Reported Jul 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS070798MTBEF2A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Duong <br /> MS/MSD # 980719502 <br /> Sample Conc 50 <br /> Prepared Date 7/7/98 <br /> Analyzed Date 7/7/98 <br /> Instrument I D # F2 <br /> Conc Spiked 50 fig/L <br /> Result 54 <br /> MS % Recovery 98 <br /> Dup Result 52 <br /> MSD % Recov 94 <br /> RPD 38 <br /> RPD Limit 0-25 <br /> LCS # LCS070798 <br /> Prepared Date 7/7/98 <br /> Analyzed Date 7/7/98 <br /> Instrument I D # F2 <br /> Conc Spiked 50 jig/L <br /> Result LCS R <br /> C e 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 /> EQUOIA LYTICAL 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 /> I <br /> gory <br /> roj t Manager **IMS=Matrix Spike, MSD=IVIS Duplicate,RPD=Relative% Difference 9806G6a BLA <3> <br />