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Se l101a 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> + 404 N Wiget Lane Walnut Creek.CA 94598 (5 10)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 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) 792-0342 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste 8-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9805E41 15-19 Reported Jun 10, 1998 <br /> 9805E43 20-22 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS052698MTBEH68 <br /> Anafy Method EPA 8260 <br /> Prep Method <br />' Analyst L Zhu <br /> MS/MSD # 9805E4116 <br /> Sample Conc 31 <br />' Prepared Date NA <br /> Analyzed Date 5/26/98 <br /> Instrument 1 D # H6 <br />' Conc Spiked 50ug/L <br /> Result 54 <br /> MS % Recovery 102 <br /> Dup Result 56 <br /> MSD % Recov 106 <br />' RPD 36 <br /> RPD Limit 0-25 <br />' LCS# LCS052698 <br />' Prepared Date N A <br /> Anafyzed Date 5/26/98 <br /> Instrument I D # H6 <br />' Conc Spiked 50p9/1- <br /> LCS Result 49 <br /> LCS % Recov 98 <br /> x0-140 <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 /> err fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> f+ <br /> N �� 1V, 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 Herltng <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9805E41 EEE c3> <br /> PD <br />