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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 (510) 988 9600 FAX(518)988 9673 <br /> Analytical a19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 1 E A Engineering Science &'Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9803307 23-24 Reported Apr 3, 1998 <br /> tQUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS031098MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method <br />' Analyst E Manuel <br /> MS/MSD# 980339107 <br /> Sample Conc N D <br />' Prepared Date 3/10/98 <br /> Analyzed Date 3/10/98 <br /> Instrument 1 D# F3 <br /> Conc Spiked 50Ng/L <br /> Result 42 <br /> MS % Recovery 134 <br /> Dup Result 43 <br /> MSD % Recov 86 <br />' RPD 24 <br /> RPD Limit 0-25 <br />' LCS # LCS031098 <br />' Prepared Date N A <br /> Analyzed Date 3/10/98 <br /> Instrument LD # F3 <br />' Conc Spiked 50 pg/L <br /> LCS Result 43 <br /> LCS % Recov 86 <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 /> SEQUOIA ANALYTICAL 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 /> (chard Herling <br /> Project Manager **MS=Matrix Spike,MSD-MS Duplicate,RPD=Relative% Difference 9803305 EEE <16> <br />