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Sequoia 6110 Chesapeake Drive Redwood Clty CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N WISet lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-%73 <br /> 9-!D— <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9ZI-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North See D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> n Lv t 1 1Y ♦ { t . t}r s ; yr t <br /> ,Gettler Ryan/Ceostrategies Client Protect IID Former Unocal SS #2859 <br /> `6747 Sierra Court, Ste J Matrix Liquid <br /> ,Dublin, CA 94568 <br /> ;Attention Deanna Harding Work Order# 9806C89 01-06 Reported Jul 23, 1898 <br /> 9806C90 07-10 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch# MS0628988260S2A <br /> Analy Method EPA 8250 <br /> Prep. Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 8061904 <br /> Sample Conc • ND <br /> Prepared Date- 6/28/98 <br /> Analyzed Date- 6/28/98 <br /> Instrument I.D #- GCMS2 <br /> Conc. Spliced 50 jtg/L <br /> Result 61 <br /> MS % Recovery 122 <br /> Dup. Result 57 <br /> MSD % Recov 114 <br /> RPD` 68 <br /> RPD Limit: 0-25 <br /> LCS# LCS062898 <br /> Prepared Date 6/28/98 <br /> Analyzed Date 6/28/98 <br /> Instrument I.D # GCMS2 <br /> Conc. Spiked 50ltg/L <br /> LCS Result 54 <br /> LCS % Recov .. 108 <br /> 60-140 <br /> LCS 65-135 <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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> LAP #1271 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 /> Tod Granicher <br /> Protect Manager *"MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference 9806C89 GET <3> <br />