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r a ' Sequoia 660 Chesapeake Dnve Redwood Cary CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wtget Lane Walnut Crock 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 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9803307 20 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC031598BTEX17A GC031598BTEX17A GC031598BTEX17A GC031598BTEX17A GC031598BTEX17A <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 DeMartonl C DeMartlni C DeMartonl C DeMartim C DeMartlni <br /> MS/MSD# 980331804 980331804 980331804 980331604 980331804 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Analyzed Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Instrument I.D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spilled 10pg/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> Result 11 10 10 32 52 <br /> MS % Recovery 110 100 100 107 87 <br /> Dup Result 10 10 95 30 49 <br /> MSD % Recov 100 100 95 100 82 <br /> RPD 95 00 51 65 59 <br /> RPD Limit 0-25 0-25 0 25 025 0-25 <br /> LCS# BLK031598 BLK031598 BLK031598 BLK031598 BLK031598 <br /> 03 598 <br /> Prepared Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Analyzed Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10pg/L 10ug/L 10pg/L 30 p9/1- 60pg/L <br /> LCS Result 10 96 93 29 47 <br /> LCS % Recov 100 96 93 97 78 <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 1s analyzed using the same reagents, <br /> SEQUOIA AN LYTIC L preparation,and analytical methods employed for the samples The matrix spoke is an aliquot of sample <br /> (� fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> L 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 Herlin <br /> Project Manager **MS=Matrix Spoke,MSD=MS Duplicate,RPD=Relative% Difference 9803305 EEE <7> <br />