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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 404 N W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9 16)921 0100 <br /> E A Engineering Science&Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste 8-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9801803 01 Reported Feb 4, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO12798BTEX18A GC0127986TEX18A GCO12798BTEX18A GCO12798BTEXISA GC012798BTEX18A <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 J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 980188103 980188103 980188103 980188103 980188103 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br />' Conc Spiked logs/L 10gg/L 10,ug/L 30gg/L 60Ng/L <br /> Result 84 85 85 25 59 <br /> MS % Recovery 84 85 85 a3 98 <br /> Dup Result 86 88 87 27 60 <br /> MSD % Recov 86 88 87 90 100 <br />' RPD 24 35 23 77 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK012898 BLK012898 BLK012898 BLK012898 BLK012898 <br />' Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br />' Conc Spiked 10gg/L 1089/L 10gg/L 30gg/L 60gg/L <br /> LCS Result 10 10 10 32 71 <br />' LCS % Recov 100 100 100 107 118 <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 H <br /> 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 Herli <br /> Project Man rr **MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference 9801803 EEE <1> <br />