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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> r Y� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> f . n h v <br /> E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> v 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order# 9611209 12, Reported ted Nov 14, 1996 <br /> v rr v r x v h � <br />' QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> CC Batch#• GC110896BTEX21A GC110896BTEX21A GC110896BTEX21A GC110896BTEX21A <br /> Analy Method. EPA 8020 EPA8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst G Fish G Fish G Fish G Fish <br /> MS/MSD# 96118408 96118408 96118408 96118408 <br />' Sample Conc . N D ND ND N D <br /> Prepared Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date- 11/8/96 11/8/96 11/8/96 11/8/96 <br />' Instrument I D# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked" 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 11 96 97 29 <br /> MS % Recovery 110 96 97 97 <br /> Dup Result 11 10 10 31 <br /> MSD % Recov 110 100 100 103 <br /> RPD 00 41 30 67 <br /> RPD Limit 0-25 0.25 0-25 0-25 <br /> ~vr } 4 F th v .nr. rr tiv Y 1w...ry rv. 4 i ,rt '.ry �r . } . i l to+~ Iry.. ry r n x v . r,v`. • . ti } r L � ,. n r ` <br /> LCS # BLK110896 SLK110896 BLK110896 BLK110896 <br />' Prepared Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date 11/8/96 11/8/96 11/8/96 11/8/96 <br />' Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30u9/L <br /> LCS Result 11 10 10 31 <br />' LCS % Recov 110 100 100 103 <br />' 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70130 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS is a control sample of known,interterent4ree matrix that is analyzed using the same reagents, <br /> SEGal10 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 /> eveett interference,the LCS recovery is to be used to validate the batch <br /> n Fa11 <br />' Project Manager MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9611209 EEE <4> <br />