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+ Sequoia 680 Chesapeake Dnve Redwood Gry,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ID 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 /> Y <br /> Dealer Ryan/Geosfrategies Clierit Project ID Unocal SS#5886 <br /> ,6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> `Attention Deanna Harding Work Order# 9803G82-10 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Diesel <br /> QC Batch# GC0401980HBPEXB <br /> Analy Method BPA 8015M <br /> Prep Method BPA 3510 <br /> Analyst D Lockhart <br /> MS/MSD # 9803J8405 <br /> Sample Conc 1500* <br /> Prepared Date. 4/1/98 <br /> Analyzed Date 4/2/98 <br /> Instrument LD # GCHP4 <br /> Conc Spiked 1000,ug/L <br /> Result <br /> MS % Recovery <br /> Dup Result <br /> SD % Recov <br /> RPD <br /> RPD Limit 0-50 <br /> *MS/MSD diluted due to matrix effects <br /> LCS # BLK040198 <br /> Prepared Date 4/1/98 <br /> Analyzed Date- 4/2/98 <br /> Instrument I D # GCHP4 <br /> Conc Spiked 1000Ng/L <br /> LCS Result 760 <br /> LCS % Recov 76 <br /> 50-150 <br /> LCS 60-140 <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 /> SEQl10 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 spoke 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,MSD=MS Duplicate,RP❑=Relative%Difference 9803G82 GET <8> <br />