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Sequoia 680 Chesapeake Dnve Redwood Ory CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (5t0)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> tE 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 Chnsta Marting Work Order# 9803306 15 Reported Apr 3, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031798BTEX01A GC031798BTEX01A GC031798BTEX01A GC031798BTEX01A GC031798BTFXOIA <br /> Analy Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 980330610 980330610 980330610 980330610 980330610 <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 3/17/88 3/17/98 <br /> instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 1apg/L long/L 1opg/L 30pg/L 60pg/L <br /> Result 92 90 92 28 55 <br /> MS % Recovery 92 90 92 93 92 <br /> Dup Result 91 90 91 27 54 <br /> MSD %Recov 91 90 91 90 90 <br /> RPD 11 00 11 36 18 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031798 BLK031798 BLK031798 BLK031798 BLK031798 <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 # GCHP1 GCHP1 GCHP1 GCHP1 GCHPt <br /> Conc Spiked 10pg/L 10jug/L 10ug/L 30Ng/L 60pg/L <br /> LCS Result 92 90 92 27 55 <br /> LCS % Recov 92 90 92 90 92 <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 /> IpSECQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> n(i fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> "`�(V��i 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 /> fiichard Herll <br /> Project Manager MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9803305 EEE <5> <br />