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*J <br /> 1 � <br /> Sequoia680 Chesapeake Drive Redwood CiM 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwo <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187, 280045 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803524-07-10 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS031198MTBEH6B <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 980330610 <br /> Sample Conc N D <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 49 <br /> ef % Recovery 98 <br /> Dup Result 49 <br /> MSD % Recov 98 <br /> RPO 00 <br /> RPD Limit 0-25 <br /> LCS # LCS031198 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument 1 D # H6 <br /> Conc Spiked 50yg/L <br /> LCS Result 50 <br /> LCS % Recov 100 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-fres matrix that is analyzed using the same reagents, <br /> Vregory <br /> 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 /> ger **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9803523 GET <17> <br />