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i <br /> Sequoia 680 Chesapeake Dnve Redwood Gty CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916192 1 0100 <br /> E A Engineering Science&Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste 8-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order # 9608581 06-09 Reported Aug 23, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO81896BTEX17A GC081896BTEX17A GCO81896BTEX17A GCO81896BTEXITA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst B Sullivan B Sullivan B Sullivan B Sullivan <br /> MS/MSD # 960818204 960818204 960818204 960818204 <br />' Sample Cone N D N D N D N D <br /> Prepared Date 8/18/96 8/18/96 8/18/96 8/18/96 <br /> Analyzed Date 8/18/96 8/18/96 8/18/96 8/18/96 <br />' Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 pg/L 10 pg/L 10 jig/L 30 ug/L <br /> Result 11 11 11 33 <br /> MS % Recovery 110 110 110 110 <br /> Dup Result 11 12 12 35 <br /> MSD % Recov. 110 120 120 117 <br />' RPD 00 87 87 59 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK081896 BLK081896 BLK081896 BLK081896 <br />' Prepared Date: 8/18/96 8/18/96 6/18/96 8/18/96 <br /> Analyzed Date 8/18/96 6/18/96 8/18/96 8/18/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 yg/L 10 pg/L 10 ug/L 30 pg/L <br /> LCS Result 11 11 11 34 <br /> LCS % Recov.' 110 110 110 113 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 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, 1 <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 tf <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 /> Xev,n:Follett <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9608581 EEE <4> <br />