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- \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (519) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suitc 8 Sacramento CA 95834 (916) 921 96CA FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste 6-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9803305 07 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO317986TEX02A GC031798BTEX02A GC031796BTEX02A GC031798STEX02A GC0317986TEX02A <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 Detvlartinl C DeMartini C DeMartlni C DeMartlnl C DeMartinl <br /> MS/MSD# 980330611 980330611 980330611 980330611 980330615 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/17/98 3/17/98 3/17/98 3/17/98 3/17/98 <br /> Analyzed Date 3/17/98 3/17/98 3/17/98 3/17/98 3/17/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> 1 Cone Spiked 10ug/L 50,ug/L 10)Jg/L 30Ng/L 60[19/L <br /> Result 86 85 87 27 55 <br /> MS % Recovery 86 85 87 90 92 <br /> Dup Result 87 86 89 27 56 <br /> MSD % Recov 87 86 89 90 93 <br /> RPD 12 12 23 00 18 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031798 BLK031798 BLK031798 BLK031798 BLK031798 <br /> 03 798 <br /> Prepared Date 3/17/98 3/17/98 3/17/98 3/17/98 3/17/98 <br /> Analyzed Date 3/17/98 3/17/98 3/17/98 3/17/98 3/17/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10}rg/L 10Pg/L 10ug/L 30ug/L 60pg/L <br /> LCS Result 88 87 89 27 55 <br /> LCS %Recov 88 87 89 90 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,interferent-free matrix that Is analyzed using the same reagents <br /> 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 analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery as to be used to validate the batch <br /> Richard Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9803305 EEE <3> <br />