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' Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9690 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 Christa Marting Work Order# 9803305 01-03 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> L QC Batch# GCO31698BTEX03A GCO31698BTEX03A GCO31698STEX03A GC0316986TEX03A GC031698BTEX03A <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 C DeMartini C DeMartinl C DeMartinl C De Martini C DeMartlni <br /> MS/MSD# 980352914 980352914 980352914 980352914 980352914 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Analyzed Date 3/16/98 3/16/98 3/15/98 3/16/98 3/16/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10,ug/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> Result 87 86 87 26 58 <br /> MS %Recovery 87 86 87 87 97 <br /> Dup Result 90 88 89 27 60 <br /> MSD % Recov 90 88 89 90 100 <br /> RPD 34 23 23 38 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031698 BLK031698 BLK031698 BLK031698 BLK031698 <br /> Prepared Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Analyzed Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br />' Conc Spiked 10 pg/L 10 ug/L 10 pg/L 30 pg/L 60 pg/L <br /> LCS Result 89 88 89 27 59 <br /> LCS % Recov 89 88 89 90 98 <br /> 60-140 60-140 <br /> 60-140 60-140 60-140 <br /> LCS 70130 70-130 70.130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,Interferent-free matrix that 1s analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> 1 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 /> Richard Heding <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9803305 EEE <1> <br />