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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 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) 92t 9600 FAX(916)921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chrlsta Marting Work Order# 9707697 08 Reported Aug 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS080497MTBEOOA <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Duong <br /> MS/MSD# 970789708 <br /> Sample Conc 72 <br /> Prepared Date N A. <br /> Analyzed Date 8/4/97 <br /> Instrument I D # H6 <br />' Conc Spiked 50pg/L <br /> Result 62 <br /> MS 's Recovery 110 <br /> Drip Result 50 <br /> MSD % Recov 86 <br /> RPD 21 <br /> RPD Limit 0-25 <br /> rr 11 J v rr J r.r v` b yr v Jr try }vryr r r r ♦ Jrry nvr +J i s v r 4rJ <br /> S{ <br /> LCS # VMB080497 <br />' Prepared Date 8/4/97 <br /> Analyzed Date 8/4/97 <br /> Instrument I D # H6 <br />' Conc Spiked 50ug/L <br /> LCS Result 55 <br /> LCS %Recov 110 <br /> 6o-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 /> SEQUA 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 tf <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 /> Kevin Follett <br /> Project Manager **MS-Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9707897 EEE <4> <br />