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' Sequoia680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtget 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 />' E A Engineering Science &Tech Client Project ID Exxon 7-0137, 5150137 1300 - <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9704171 05-07, 09 Reported Apr 18, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCO40997BTEX17A GCO4099713TEX17A GCO40997BTEX17A GCO40997BTEX17A GCG40897BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst A. Mtraftab A.Miraftab A Mrraftab A.Miraftab A.Miraftab <br /> MS/MSD # 9703F1403 9703F1403 9703F1403 9703F1403 9703F1403 <br />' Sample Conc • N D N D N D N D N D <br /> Prepared Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Analyzed Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br />' Conc Spiked long/L 10pg/L 10ug/L 30pg/L 60pg/L <br /> Result 10 10 10 31 60 <br /> MS % Recovery 100 100 100 103 100 <br /> Dup Result it 11 11 32 61 <br /> MSD % Recov 93 92 92 100 102 <br />' RPD 95 95 95 32 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> hr k 4S <br /> LCS# BLK040997BS BLK040997BS BLK0409976S BLKG40997BS BLKD40997BS <br />' Prepared Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Analyzed Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Instrument 1 D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10us/L 30pg/L 60pg/L <br /> LCS Result 97 98 97 29 56 <br /> LCS % Recov 97 98 97 97 93 <br /> 60.140 60-140 60-140 60-140 60.140 <br />' LCS 70-130 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 ANALYTIC 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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike,MSD-MS Duplicate, RPD=Relative%Difference 9704171 EEE <3> <br />