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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> J q 404 N Wigct 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(9 16)921 0100 <br /> i <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 Marting Work Order # 9711733 01 Reported Dec 9, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# NIS 111897MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method <br />' Analyst L Duong <br /> MS/MSD # 971147201 <br />' Sample Conc N D <br /> Prepared Date 11/18/97 <br /> Analyzed Date 11/18/97 <br /> Instrument I D # F3 <br />' Conc Spiked 50pg/L <br /> Result 53 <br /> MS % Recovery 106 <br /> 10 Dup Result 53 <br /> MSD % Recov 106 <br /> RPD 00 <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 50,ug/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> 60-140 <br />' LCS 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> EQUOIA 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 matnx <br /> interference,the LCS recovery is to be used to validate the batch <br /> rd r ng **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manage 9711732 EEE <77 <br />