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Sequoia 680 Chesapeake Dnve Redwood Cary CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> �Y1 i 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)989 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento C4 95834 (916) 921 9600 FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9801803 02, 04 Reported Feb 4, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> OC Batch# GCO12698BTEX18A GC012698BTEX18A GCO12698BTEX18A GCO12698BTEX18A GCO12698STEX18A <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 DeMartoni C DeMartini C DeMartini C DeMartinl C DeMartini <br /> MS/MSD # 980154201 980154201 980154201 980154201 980154201 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date 1/26/98 1/26/98 1/26/98 1/26/98 1/26/98 <br /> Analyzed Date 1/26/98 1/26/98 1/26/96 1/26/98 1/26/98 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10 pg/L 10 pg/L I O pg/L 30,ug/L 60 jag/L <br /> Result 90 90 90 28 60 <br /> MS % Recovery 90 90 90 93 100 <br /> Dup Result 83 84 84 26 58 <br /> MSD % Recov 83 84 84 87 97 <br />' RPD 81 69 69 74 34 <br /> RPD Limit 0-25 0.25 0-25 0-25 0-25 <br /> LCS# BLK012698 BLK012698 BLK012698 BLK012698 BLK012698 <br />' Prepared Date 1/26/98 1/26/98 1/26/98 1/26/98 1/26/98 <br /> Analyzed Date 1/26/98 1/26/98 1/26/98 1/26/98 1/26/98 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br />' Conc Spiked 10Ng/L 10pg/L 10pg/L 30jtg/L 60Ng/L <br /> LCS Result 10 10 10 32 71 <br />' LCS % Recov 10o 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 9 <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 H 1 <br />' Project <br /> Maria r **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9801803 EEE <2> <br />