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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget[ane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> j 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 Client Project ID Shell 2494 E Fremont <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9805091-01-02 Reported May 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch# MS050498MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 980508604 <br /> Sample Conc N D <br /> Prepared Date 5/4/98 <br /> Analyzed Date 5/8/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500pg/Kg <br /> Result- 1800 <br /> MS % Recovery 72 <br /> Dup Result 2000 <br /> MSD % Recov 80 <br /> RPD 11 <br /> RPD Limit 0-25 <br /> LCS# LCS050498 <br /> Prepared Date 5/4/98 <br /> Analyzed Date 5/8/98 <br /> Instrument I D # HIS <br /> Conc Spiked 2500,ug/Kg <br /> LCS Result 2300 <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 /> JS <br /> eAAL 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 /> "*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9805091 CCC <2> <br />