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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek,CA 94598 (510)9BO-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 /> • <br /> Cambria Environmental Tech Client Project ID Shell 341 E Main <br /> 114465th St, Ste C Matrix Liquid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803F79 08 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS032598MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst. M Williams <br /> MS/MSD# 9803F1808 <br /> Sample Cone. 28 <br /> Prepared Date 3/25/98 <br /> Analyzed Date 3/25/98 <br /> Instrument 1 D # H6 <br /> Cone Spiked 50 ug/L <br /> Result 46 <br /> MS %Recovery 86 <br /> Dup Result 49 <br /> MSD %Recov 92 <br /> RPD 11 <br /> RPD Limit 0-25 <br /> LCS# LC8032598 <br /> Prepared Date- N A. <br /> Analyzed Date- 3/25/98 <br /> Instrument I D #- H6 <br /> Cone. Spiked 50ltg/L <br /> LCS Result 46 <br /> LCS %Recov 92 <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 /> .SEQUVAINALYTIL 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 /> R harding <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9803F79 CCC <5> <br />