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esapeake Drive Redwood City CA 90 (650)364-9600 FAX(650)364-9233 <br /> Sequoia *Wlget Lane Walnut Creek.CA 94598 (925}988-9600 FAX(925)968-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> cx ,, Analytical 1455 M.cDoweli Blvd North Ste D Petaluma,CA 94954 (707}792-1865 FAX(707)792-0342 <br /> OBlaine Tech Services, Inc Client Project ID Shell 341 East Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9811 H53-01 Reported Dec 14, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS1207988260S2A <br /> Anally Method EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 8111772 <br /> Sample Conc 57 <br /> Prepared Date 12/7/98 <br /> Analyzed Date 12/7/98 <br /> Instrument I D # GCMS2 <br /> Cone Spiked 50pg/L <br /> Result 95 <br /> MS % Recovery 76 <br /> Dup Result s2 <br /> MSD % Recov 70 <br /> RPD 32 <br /> RPD Limit 0-25 <br /> LCS# LCS120798 <br /> Prepared Date 12/7/98 <br /> Analyzed Date 12/7/98 <br /> Instrument I.D # GCMS2 <br /> Cone Spiked 50ug/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br />,SEQUO" <br /> LYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 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 /> grOy nner <br /> Prb ect anager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9811H53 BLA a2> <br />