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Sequoia <br /> e uO71 680 Chcsapcakc Dnve Rcdwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> J 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) 921 Otoo <br /> E A Engineering Science &Tech Client Project ID Exxon 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chnsta Martmg Work Order # 9711732 12 Reported Dec 9, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS112197MTBEF'3A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Duong <br /> MS/MSD # 971173091 <br /> Sample Conc N D <br /> Prepared Date 11/21/97 <br /> Analyzed Date 11/21/97 <br /> Instrument 1.13 # F3 <br />' Conc Spiked 50pg/L <br /> Result 54 <br /> MS % Recovery 108 <br /> Dup Result 53 <br /> MSD % Recov 106 <br />' RPD 19 <br /> RPD Limit 0-25 <br /> LCS # LCS112197 <br />' Prepared Date 11/21/97 <br /> Analyzed Date 11/21/97 <br /> Instrument I D # F3 <br />' Conc Spiked 50Pg/L <br /> LCS Result 52 <br /> LCS % Recov 104 <br /> 50.140 <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 /> i 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 H ding **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager 9711732 EEE <6> <br />