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- ' Redwood City CA 94063 (4 15) 364 9600 FAX I4151 364 9233 <br /> Sequoia o80 Chesapeake Dp4e <br /> 404 N W,gec Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avenue Suitt 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' E A Engineering Science&Tech Client Project ID Exxon 7-3942 / 8373942 1307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order# 9602A05 f 02 Reported Feb 23, 1996 <br />' QUALITY CUNTRQL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br />' OC Batch# GCO216966TEX02A GCO21596BTEX02A GCO21696BTEX02-A GCO21696BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst J woo J woo J woo J Woo <br /> MS/MSD # 960245102 960245102 960245102 960245102 <br /> Sample Cone N D N D N D N D <br />' Prepared Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Analyzed Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument I D.# GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cont Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L <br /> Result 99 98 97 28 <br /> MS% Recovery 99 98 97 93 <br /> Dup. Result 11 11 11 32 <br /> MSD % Recov 110 110 110 107 <br /> RPD 11 12 13 13 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> ._ <br /> LCS # BLK021696 BLK021696 BLK021696 BLK021696 <br /> Prepared Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Analyzed Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br />' Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result. 99 96 93 29 <br /> LCS % Recov.. 99 96 93 97 <br /> LCS 70-130 70-130 70-130 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 The <br /> 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 tf <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 /> Kevin Follett <br /> Project Manager "'MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9602A05 EEE <2> <br /> 1 <br />