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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)1364 9233+ <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988%73 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 6100 <br /> Blaine Tech Services, Inc Client Project 1D Shell Stockton 980112-H2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 F <br /> Attention Fran Thie Work Order# 9801694-01-09, 9801695-10-12 Reported Jan 30, 1998J- <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' MTBE <br /> QC Batch#: MS012098826082A <br /> Analy. Method EPA 8260 <br /> Prep. Method. EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD # 8010825 <br /> Sample Cone ND <br /> Prepared Date 1/20/98 <br /> Analyzed Date 1/20/98 <br /> Instrument 1 D # GCMS2 <br /> Cone. Spiked 50 ug/L <br /> Result 48 <br /> MS % Recovery 96 <br /> Dup. Result 43 <br /> MSD % Recov. 86 <br /> RPD- 11 <br /> RPD-Limit:�0-25 <br /> LCS # LCS012098 <br /> Prepared-Date 172o/ss <br /> Analyzed Date 1/20/98 <br /> Instrument LD # GCMS2 <br /> Conc Spiked. 50 us/L <br /> LCS Result 36 <br /> LCS % Recov 72 <br /> 60-140 <br /> LCS 65-135 <br /> Control Limits <br /> Please Note <br /> SEQUOI ANALYTICAL The LCS is a control sample of known,interferent-tree matrix that is analyzed using the same reagent <br /> 4EI # 1 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedurethe 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 /> enner <br /> Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9801694 BLA <8> <br />