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i <br /> 4D Sequoia 680 Chesapeake Dnve Redwood C.ty,CA 94063 (650) 3649600 FAX(650)364 9233 <br /> 404 N Wigez Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> fr�ll� Analytical 819 Stnker Avenue,Sate 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> .;Gettler Ryan/Geostrategies Client Project ID Unocal $S#5886 " V <br /> ,6747 Sierra Court, Ste J Matrix Liquid .s <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803G82-05 Reported Apr 15, 1998' <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#- MS033098MTBE;F3A <br /> Analy. Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD # 980-3134301 <br /> Sample Cone 48 <br /> Prepared Date - <br /> Analyzed Date 3/30/98 <br /> Instrument I D # F3 <br /> Cone Spiked 50yg/L <br /> Result 56 <br /> MS % Recovery 102 <br /> 1* Dup Result 67 <br /> MSD % Recov 124 <br /> RPD 18 <br /> RPD Limit 0-25 <br /> LCS # LCS033198 <br /> Prepared Date . <br /> Analyzed Date 3/31/98 <br /> Instrument I D # F3 <br /> Cone Spiked 50,ug/L <br /> LCS Result- 55 <br /> LCS % Recov .. 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please(Vote <br /> The LCS is a control sample of known,interferent-tree matrix that is analyzed using the same reagents, <br /> tSEIUOIA N 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> gory <br /> ct Manager **MS=Matrix Spike,MSD MS Duplicate,RPD=Relative%Difference 98031382 GET <4n <br />