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r <br /> 6 <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 8!9 Sulker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 fAX(916)921 0100 <br /> 1W Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 10 <br /> Cambria Client Project ID Shell 2494 Fremont <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Mike Murphy Work Order# 9805086-01-05 Reported May 20, 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 2500 pg/Kg <br /> Result 1800 <br /> IVIS % 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 5/5/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500 pg/K9 <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 /> A 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 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 /> gennerManager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9805086 CCC <3> <br />