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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> L - 404 N Wiger Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Sucre 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 OiQO <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 130D <br /> 3468 Mt Diablo Blvd , Ste 8-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9805E41 14 Reported Jun 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS052698MTBEH6A <br /> Analy Method EPA8260 <br /> Prep Method <br />' Analyst E Manuel <br /> MS/MSD# 9805E6503 <br /> Sample Conc N D <br />' Prepared Date NA <br /> Analyzed Date 5/26/98 <br /> Instrument I D # H6 <br />' Conic Spiked 50u9/L <br /> Result 47 <br /> MS % Recovery 94 <br /> Dup Result 50 <br /> MSD % Recov coo <br />' RPD 62 <br /> RPD Limit 0-25 <br />' LCS # LCS052698 <br />' Prepared Date NA <br /> Analyzed Date 5/26/98 <br /> Instrument 1 D # H6 <br />' Conic Spiked 50pg/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> 1Please 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 /> 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 'i MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9805E41 EEE <2> <br />