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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 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 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 -02 Reported Aug 4, 1998 I <br /> QUALITY CONTROL DATA REPORT I <br /> Analyte MTBE <br /> QC Batch# MS072298MTBEEXA <br /> Anally Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Duong I <br /> MS/MSD# 9807B9401 <br /> Sample Cone N D <br /> Prepared Date 7/22/98 <br /> Analyzed Date 7/22/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500 pg/Kg <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# Lcs072298 <br /> Prepared Date 7/22/98 I <br /> Analyzed Date 7/23/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500 pg/Kg <br /> LCS Result 2200 _ <br /> LCS % Recov` 88 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> aeggenner <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents,NALYTICAL 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 subieoted 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 /> nager **MS=Matrix Spike,MSD=MS Duplicate, FtPD=Relative%Difference 9807C66 GCC <1> <br /> I <br />