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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (925)9S8 9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Sum 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707) 791-0342 <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# 9808C95 10, 11, 14, 15 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS082698MTBEH6A > <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Duong <br /> MS/MSD # 980892902 f <br /> Sample Conc N D <br /> Prepared Date 8/26/98 1 <br /> Analyzed Date 8/26/98 <br /> Instrument I D # H6 t <br /> Conic Spiked 50 fig/L <br /> Result as <br /> MS % Recovery 96 I <br /> 10 Dup Result 49 I <br /> 1 <br /> MSD % Recov 98 i <br /> RPD 21 <br /> RPD Limit 0-25 I <br /> LCS # LCS082798 I <br /> Prepared Date 8/27/98 <br /> Analyzed Date 8/27/98 G <br /> Instrument I D # H6 <br /> Conic Spiked 50gg/L p <br />' ! <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,interferent-free matrix that is analyzed using the same reagents, <br /> SEQQUUOII�A�ANA YTICAL 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 /> Richard Herling <br /> interference,the LCS recovery Is to be used to validate the batch t <br /> � <br /> Project Manager ""MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9808C95 EEE <3> <br />