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(1�1 Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 Nf Wiget Lane Walnut Creek CA 94598 (510) 989-9600 FAX(510)988-9673 <br /> � Analytical 919 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS# 5886 "` } <br /> .6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 =< <br /> 'Attention Deanna Harding Work Order# 9803G84-11 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 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 /> 4ODup 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. 50ug/L <br /> LCS Result. 52 <br /> LCS % Recov .. 104 <br /> 80-140 <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 /> SEQUOI A 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 M <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 /> Project Manager **MS Matrix Spike,MSO MS Duplicate, RPD Relative%Difference 9803G82 GET <1o> <br />