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Sequoia680 Chesapeake Drive Redwood Gty,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ~ 404 N W19et Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510) 988 9673 <br /> �tfll� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 92t-9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#5886 f h <br /> x6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> ;Attention Deanna Harding Work Order# 9803G84-12 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 Conc 39 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument LD # F3 <br /> Conc Spiked 50ug/L <br /> Result 5s <br /> MS % Recovery too <br /> � Dup Result* 56 <br /> SD % Recov 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LC8033198 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument I D # F3 <br /> Conc Spiked. 50 us/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 /> jS000I 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 /> regory <br /> roject Manager **MS=Matnx Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803682 GET <11> <br />