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' <br /> Sequoia <br /> 7 O�� 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> u 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988 9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-Otoo <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 1865 FAX(707)792 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# 9808C98 22 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS082798MTBEH6A i <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD# 9808C9712 f <br /> Sample Conc ND <br /> Prepared Date 8/27/98 <br /> Analyzed Date 8/27/98 i <br /> I <br /> Instrument i D # Hs t <br /> Conc Spiked 50 Pg/L <br /> Result 47 <br /> MS % Recovery 94 <br /> Dup Result 49 <br /> SD % Recov 98 I <br /> RPD 42 <br /> RPD Limit 0-25 <br /> LCS # LCS082798 <br /> Prepared Date 8/27/98 <br /> Analyzed Date 8/27/98 <br /> Instrument I D # H6 ' <br /> Conc Spiked 50ug/L <br /> LCS Result 39 <br /> LCS % Recov 78 <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 /> S UOIAAPJALYTICAL 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 Herling <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate RPD=Relattve,6 Difference 9808C95 EEE <6> <br />