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/ ` \ Sequoia680 Chesapeake Dnvc Redwood C-ry CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wget 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 Protect ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94,549 <br /> Attention Chrlsta Marting Work Order# 9803306 18 Reported Apr 3, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' OC Batch# MS0311981NTBEH6B <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Zhu <br /> MS/MSD# 980330610 <br /> Sample Conc N D <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50ug/L <br /> Result 49 <br /> MS % Recovery 98 <br /> FADup Result 49 <br /> MSD% Recov 98 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS031198 <br />' Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> LCS Result 50 <br /> LCS % Recov 100 <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 /> Richard Herlin <br /> Protect Manager MS=Matrix Spike,MSD=MS Duplicate RPD=Relative% Difference 9803305 EEE <14> <br />