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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9000 FAX (510)988 9673 <br /> X1,7 Analytical 819 Striker Avenue Suite 8 Sacramento C.S. 95934 (916) 921 9o00 FAX (916)92t 0100 <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 Chnsta Marting Work Order# 9803305 01-09 Reported Apr 3, 1998 <br /> 9803306 10-16 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS031198MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD# 980330501 <br /> Sample Cone N D <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/9a <br /> Instrument I D # H6 <br />' Cone Spiked 50pg/L <br /> Result 49 <br /> MS %Recovery 98 <br /> Dup Result 48 <br /> MSD % Recov 96 <br />' RPD 21 <br /> RPD Limit 0-25 <br /> LCS# LCS031198 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # H6 <br />' Cone Spiked 50 Vg/L <br /> LCS Result 47 <br /> LCS % Recov 94 <br /> 60-140 <br />' LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,)nterferent-free matrix that is analyzed using the same reagents <br /> SE4Herling <br /> ]CAL 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 /> Ric <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative % Difference 9803305 EEE <12> <br />