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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> fall>� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1 <br /> iE A Engineering Science &Tech Client Project ID Exxon 7-3942, 51 539 42 1 300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9708E45-05, 18 Reported Sep 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> CC Batch# GCO83097BTEX07A GCO83097BTEX07A GCO83097BTEX07A GCO83097STEX07A GCO83097BTEX07A <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 J Heider J Heider J Helder J Heider J Heider <br /> MS/MSD# 9708C7106 9708C7106 9708C7106 970807106 970SC7106 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Analyzed Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conic Spiked 10{lg/L 10lig/L 10,rg/L 30pg/L 60Ng/L <br /> Result 97 97 96 30 65 <br /> '14S % Recovery 97 97 96 100 108 <br /> 10 Dup Result 86 84 86 26 57 <br /> MSD % Recov 86 84 86 87 95 <br /> RPD 12 14 11 14 13 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK083097 BLK083097 BLK083097 BLK083097 BLK083097 <br /> Prepared Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Analyzed Date 8/30/97 8/30/97 8/30/97 8/30/97 6/30/97 <br /> Instrument 1 D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked 10ftg/L 10Ng/L 10,ug/L 30ug/L 60}tg/L <br /> LCS Result 82 81 82 25 55 <br /> LCS % Recov 82 81 82 83 92 <br /> i <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,interferent4ree matrix that is analyzed using the same reagents, <br /> =QUOTA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an altquot of sample <br /> 7 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 />' ichard interference,the LCS recovery is to be used to validate the batch <br /> Herling <br /> Project Manager *MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9708E45 EEE <3s <br />