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Sequoia 680 Chesapeake Dnve Redwood Cary CA 94063 (415) 364 9600 FAX(4f5) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> fly Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)92f 0100 <br /> EA Engineering Science &Tech - Client Project ID Exxon' <br /> 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> ';Attention Tracy Faulkner Work Order# 9611209 13 Reported Nov 14, 1996; <br /> v v .. x <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC110796BTEX02A GC110796BTEX02A GC110796BTEX02A GC110796BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Arteaga <br /> MS/MSD# 961114304 961114304 961114304 961114304 <br />' Sample Conc ' N D N D N D N D <br /> Prepared Date 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Analyzed Date 11/7/96 11/7/96 11/7/96 11/7/96 <br />' Instrument I D.# GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked layg/L 10pg/L 10pg/L 30uq/L <br /> Result 11 92 88 25 <br /> MS %Recovery 110 92 88 83 <br /> Dup Result 11 94 90 25 <br /> MSD %Recov 110 94 90 83 <br /> RPD 00 22 22 00 <br /> RPD Limrt 0-25 0.25 0-25 0-25 <br /> .., H , ��, x ,. ,n. .,� n,' „ , v � `, ,r nVrn ,,.,w, �Y , r . Y-, • , 4 r . ,., .,..., ti. ,n v, „} <br /> LCS#: BLK110796 BLK110796 BLK110796 BLK110796 <br />' Prepared Date 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Analyzed Date 11/7/96 11/7/96 11/7/96 11/7/96 <br />' Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked 10pg/L 10ug/L 10pg/L 30ug/L <br /> LCS Result 99 86 83 23 <br />' LCS % Recov.: 99 88 83 77 <br />' 60.140 60-140 60-140 60-140 <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 /> XeVlnlA 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 H <br /> 1 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 /> ollett <br />' Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9611209 EEE <5> <br />