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r <br /> e <br /> k <br /> Sequoia 690 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)488 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 6981, 7855 22 <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9712694 -01-09 Reported Dec 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS121497MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Duong <br /> MS/MSD # 971264701 <br /> Sample Conc N D <br /> Prepared Date 12/14/97 <br /> Analyzed Date 12/14/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50 jig/L <br /> Result 52 <br /> 40S % Recovery 104 <br /> Dup Result 52 <br /> MSD % Recov 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS121697 <br /> Prepared Date 12/15/97 <br /> Analyzed Date. 12/15/97 <br /> instrument I D # F3 <br /> Conc Spiked 50Ng/L <br /> LCS Result 47 <br /> LCS % Recov 94 <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 /> MQUOIA ANALYTICAL 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 LGS recovery is to be used to validate the batch <br /> Oegry **MS Matrix Spike,MSD-MS Duplicate, RPD=Relative%Difference <br /> P o ct Manager 9712694 GET <1> <br />