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f - \ Sequoia 680 Chesapeake Dnve Rcdwood Cary CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404N 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)921 0100 <br /> 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 # 9803306 17 Reported Apr 3, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS031198MTSEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD # 980352407 <br /> Sample Cone N D <br /> Prepared Date 3/12/98 <br /> Analyzed Date 3/12/98 <br /> Instrument 1 D # H6 <br />' Cone Spiked 50y9/L <br /> Result 47 <br /> MS % Recovery 94 <br /> Dup Resutt 50 <br /> MSD % Recov 100 <br /> RPD 62 <br /> RPD Limit 0-25 <br />' LCS # LCS031298 <br /> 1 Prepared Date 3/12/98 <br /> Anatyzed Date 3/12/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 fig/L <br /> LCS Result 49 <br /> LCS % Recov 98 <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 ANAL ICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified wtih 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 /> Herling <br /> ERichard <br /> g <br /> Protect Manager "*MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference 9803305 EEE <13> <br />