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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> alAnalytical <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 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 Chrlsta Marting Work Order # 9702110 04, 05, 07, 09-11 Reported Feb 13, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO20597BTEX02A GCO20597BTEX02A GCO20597BTEX02A GCO20597BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD# 9701D1601 9701 D1601 9701 D1601 9701 D1601 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Analyzed Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 frg/L 1oNg/L 10pg/L 30Ng/L <br /> Result 98 10 10 32 <br /> MS % Recovery 98 100 100 107 <br /> Dup Result 10 10 10 33 <br /> MSD % Recov 100 100 100 110 <br />' RPD 20 00 00 31 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK020597A BLK020597A BLK020597A BLK020597A <br />' Prepared Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Analyzed Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10pg/L 10ftg/L 10Ng/L 30pg/L <br /> LCS Result 95 96 97 31 <br /> LCS % Recov 95 96 97 103 <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 1s analyzed using the same reagents <br /> SEQUOIA A ALYTICAL 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 1s to be used to validate the batch <br /> wK In Follett <br /> (-Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9702110 EEE <2> <br />