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' 1 Sequoia 690 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wigrt 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 />'J 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# 9707$97 03, 08 Reported Aug 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC073097BTEX03A GC073097BTEX03A GCO73097BTEX03A GC073097BTEX03A GC072897BTEX03A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst D Jirsa D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD# 9707C2204 9707C2204 970702204 970702204 9707C2204 <br /> Sample Conc N D N D lei D N D N D <br /> Prepared Date 7/30/97 7/30/97 7/30/97 7/30/97 7/30/97 <br /> Analyzed Date 7/30/97 7/30/97 7/30/97 7/30/97 7/30/97 <br /> Instrument I D# GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br />' Conc Spiked 10pg/L 10ug/L 10j1g/L 30yg/L 60pg/L <br /> Result 93 88 90 25 72 <br /> MS % Recovery 93 88 90 63 120 <br /> Dup Result 11 87 89 25 71 <br /> MSD % Recov 110 87 89 83 118 <br />' RPD 17 11 11 00 14 <br /> RPD Limit 0.25 0-25 0.25 0-25 0-25 <br /> LCS# BLK073097 BLK073097 BLK073097 BLK073097 BLK073097 <br /> Prepared Date 7/30/97 7/30/97 7/30/97 7/30/97 7/30/97 <br /> Analyzed Date 7/30/97 7/30/97 7/30/97 7/30/97 7/30/97 <br /> Instrument 1 D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10,ug/L 10pg/L lopg/L 30ftg/L 60yg/L <br /> LCS Result 89 88 89 25 71 <br /> LCS % Recov 89 88 89 83 118 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70.930 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 /> SECLiD A 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 /> 14A 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 9707897 EEE <2> <br />