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- \ Sequoia 680 Chesapeake Drive Pcdwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> _J 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)989 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95934 (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 94,549 <br /> Attention Christa Marting Work Order# 9803307 19 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO31698BTEX17A GC031698BTEX17A GC031698BTEX17A GC031698BTEX17A GC031698BTEX17A <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 DeMartini C DeMartini C DeMartini C DeMartini <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 3/16/98 3/16/98 3/16/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L SOpg/L <br /> Result 106 99 98 30 49 <br /> MS `ib Recovery 106 99 98 100 82 <br /> Dup Result 106 99 9 8 30 49 <br /> MSD %Recov 106 90 91 90 90 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031698 BLK031698 BLK031698 BLK031698 <br /> 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 1 D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 109 103 103 31 52 <br /> LCS %Recov 109 103 103 103 87 <br /> 60-140 60-140 60-140 50-140 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 /> ll SEQUOIA 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 anaiytes 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 Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803305 EEE <6;> <br />