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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 <br /> Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> IQV1455 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 <br /> 114465th St , Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803F79 01, 03, 04,07 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch# MSM2598MTBEEKA <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst E Manuel <br /> MS/MSD#. 98o3F79at <br /> Sample Cone. N D <br /> Prepared Date 3/25/98 <br /> Analyzed Date 3/25/98 <br /> Instrument I D # F2 <br /> Cone Spiked 2500jig/Kg <br /> Result 2000 <br /> .MS % Recovery 80 <br /> Dup Result 1800 <br /> MSD %Recov 72 <br /> RPD 11 <br /> RPD Limit. 0-25 <br /> LCS # LCS032598 <br /> Prepared Date 3/25/98 <br /> Analyzed Date 3/25/98 <br /> Instrument I D.# F2 <br /> Cone Spiked 2500 ug/Kg <br /> LCS Result 2200 <br /> LCS %Recov 88 <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 /> 0 SEQUOIA 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 Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 98031779 CCC <4> <br />