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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 (510) 988 9600 FAX(510)988 9673 <br /> ,!D— <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916) 921-0100 <br /> Client Project ID Unocal SS#5886 <br /> Gettler Ryan/Geostrategles r <br /> 36747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803G82-09, 10 Reported Apr 15, 1998'{ <br /> v 4 .wr r s r ♦ ` 4 ri 1r r r r ` r l 3 v r <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 Conc 39 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument 1.13 # F3 <br /> Conc Spiked 50pg/L <br /> Result 55 <br /> MS % Recovery 104 <br /> ISDup Result 56 <br /> SD % Recov 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS #- LCSO40198 <br /> Prepared Date 4/1/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50pg/L <br /> LCS Result: 52 <br /> LCS % Recov• 104 <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 /> SEQUOIA AN LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Vrject <br /> fortifiedwith 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 /> gory <br /> anager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803G82 GET <B> <br />