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11) Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 96W FAX(650)364 9233 <br /> 404 N Wigtt Lane Walnut Geek,CA 94598 (510) 988-9600 FAX(510) 988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916) 921 0100 <br /> i <br /> Gettler Ryan/Geosirategies xY Client Project ID A Unocal}SS#5886 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> ,Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803G82-06-08 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS033198MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A. <br /> Analyst E Manuel <br /> MS/MSD # 9803HO602 <br /> Sample Conic 3.9 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50pg/L <br /> Result 56 <br /> MS % Recovery 104 <br /> L <br /> Dup Result 56 <br /> D % Recov 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS033198 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument I D.# F3 <br /> Conc Spiked 50,ug/L <br /> LCS Result 55 <br /> LCS % Recov 110 <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 /> VctManag7 <br /> CAL preparation,and analytical methods employed for the samples The matnx 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 /> **MS=Matrix Spike, MSD MS Duplicate, RPD=Relative%Difference 9803G82 GET <5> <br />