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Sequoia 680 Chesapeake Dnve Redwood City Ca 94063 (650) 364 9600 FAX(650)364 9233 <br /> ♦.��ri 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> E A Engineering Science &Tech Client Project 1D Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste 13-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Martmg Work Order# 9803307 19-22 Reported Apr 3, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS031198MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD # 980330501 <br /> Sample Conic N D <br />' Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 fig/L <br /> Result 49 <br /> MS % Recovery 98 <br /> Dup Result 48 <br /> MSD % Recov 96 <br /> RPD 21 <br /> RPD Limit 025 <br /> LC <br /> S031198 <br /> # So31198 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument LD # H6 <br /> Conc Spiked 50 fig/L <br /> LCS Result 47 <br /> LCS % Recov 94 <br /> 1 <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 /> WANALYTIL 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 /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803305 EEE <15> <br />