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I Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N W1get lane Walnut Creek CA 94598 (9Z 5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> d 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Environmental Client Project ID Shell 341 E Main St <br /> 114465th St , Ste C Matrix Solid <br /> Oakland, CA 94608 <br />' Attention Owen Ratchye Work Order# 9807C66-01, 03-04 Reported Aug 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> GC Batch# MS072298MT13EEXA <br /> Analy Method EPA 8260 <br /> Prep Method N A. <br /> I Analyst L Duong <br /> MS/MSD # 9807139401 <br /> Sample Cone N D <br /> Prepared Date 7/22/98 <br /> Analyzed Date 7/22/98 <br /> Instrument 1.13 # H6 <br /> Cone Spiked 2500yg/Kg <br /> Result 2500 <br /> MS%Recovery 100 <br /> Dup Result 2300 <br /> 6 MSD %Recov 92 <br /> I RPD 83 <br /> RPD Limit 0-25 <br /> ILCS# LCS072498 <br /> Prepared Date 7/24/98 <br /> Analyzed Date 7/24/98 <br /> Instrument I D # H6 <br /> I Cone Spiked 2,501 jig/Kg <br /> LCS Result 2500 <br />[ LCS % Recov 100 <br /> f <br /> 60-140 <br /> LCS 70-130 <br /> IControl Limits <br /> Please Note <br /> I The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SE ALYTICAL 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 fail within specified control limits due to matrix <br /> Ointerference,the LCS recovery is to be used to validate the batch <br /> P ggy P neer <br /> Pr lec anager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9807066 CCC <2> <br />