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Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> �Y^ SJ q 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)92l 0100 <br />' E A Engineering Science &Tech Client Project ID Ewan 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9711732 04, 05, 07 Reported Dec 9, 1997 <br /> 1 QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS112197MTBEEXA <br /> Anaiy Method EPA 8260 <br /> Prep Method <br />' Analyst L Zhu <br /> MS/MSD # 9711137202 <br /> Sample Conc N D <br /> Prepared Date 11/21/97 <br /> Analyzed Date 11/23/97 <br /> Instrument I D # F2 <br />' Conc Spiked 2500 ug/Kg <br /> Result 2400 <br /> MS % Recovery 96 <br /> Dup Result 2400 <br /> MSD % Recov 96 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> 1 <br /> LCS# LCS112197 <br /> Prepared Date 11/21/97 <br /> Analyzed Date 11/23/97 <br /> Instrument I D # F3 <br />' Conc Spiked 50pg/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br />' Please!Vote <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANAL ICAL 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 anaiytical procedure If <br /> l 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 /> Richard Herling **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference <br /> Project Manager 9711732 EEE <6> <br />