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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 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Environmental Tech Client Project ID Shell, 341 E Main, Ripon <br /> 1144 65th St , Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 98031-68 01 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40298MTBEEXB <br /> Anally Method EPA 8260 <br /> Prep Method <br /> Analyst L.Zhu <br /> MS/MSD# 9803G3413 <br /> Sample Cone N D <br /> Prepared Date 4/2/98 <br /> Analyzed Date 4/2/98 <br /> Instrument I.D.# H6 <br /> i <br /> Cone Spiked 2500 Ng/Kg <br /> I <br /> Result 2500 <br /> *MS % Recovery 100 <br /> Dup Result 2300 <br /> MSD % Recov 92 <br /> RPD 83 <br /> RPD Limit. 0-25 <br /> LCs# LCSO40398 <br /> Prepared Date 4/3/98 <br /> Analyzed Date 4/3/98 <br /> Instrument I D.# F3 <br /> Cone Spiked 2500Etg/Kg <br /> LCS Result 2640 <br /> LCS % Recov 106 <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 /> 4V EQUOIA ANALYTICAL 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 /> Richard Herlin <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803L68 CCC �3> <br />