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Sequoia 680 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)988-9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwo <br /> Geitler Ryan/Geosfrategies Client Project ID 'Unocal 0123/1034 Central Ave <br /> ,6747 Sierra Court, Ste J Matra Liquid f <br /> "Dublin, CA 94568 <br /> " Attention Deanna Harding Work Order# 98031-106-03-05 Reported Apr 13+ 1998~ <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS032898MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD # 980306501 <br /> Sample Conc N D <br /> Prepared Date - <br /> Analyzed Date 3/28/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 54 <br /> MS % Recovery 108 <br /> Dup Result 51 <br /> MSD % Recov 102 <br /> RPD 57 <br /> RPD Limit 0-25 <br /> LCS # LCS033098 <br /> Prepared Date - <br /> Analyzed Date 3/30/98 <br /> Instrument I D # H6 <br /> Conc Spiked- 50Yg/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 /> SEQUO YT <br /> ICAL 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 /> I egory <br /> Pr ect Manager "�MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803H06 GET <4> <br />