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i <br /> ,. 680 Chesapeake Drive Redwood City CA 94063 (650)3664-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wiget 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)921-010 0 <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 Chevron 9-1848/981118-K2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9811 D37-02 Reported Dec 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120498MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 981212710 <br /> Sample Conc 24 <br /> Prepared Date 12/4/98 <br /> Analyzed Date 12/4/98 <br /> lnstrument I D # HB <br /> Conc Spiked 50Ng/L <br /> Result 4s <br /> MS % Recovery 87 <br /> Dup Result 45 <br /> MSD % Recov 85 <br /> RPD 22 <br /> RPD Limit 0-25 <br /> LCS # LCS120898 <br /> Prepared Date 12/8/98 <br /> Analyzed Date 12/8/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50lig/L <br /> LCS Result 43 <br /> LCS% Recov 86 <br /> 60140 <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 A 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 fail within specified control limits due to matrix <br /> ~ interference,the LCS recovery is to be used to validate the batch <br /> gory <br /> rolect Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative %Difference 9811D37 BLA <2> <br />