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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4151 364 9600 FAX (415) 364 9233 <br /> Sequoia <br /> 404 N VL eget Lane Walnut Creek CA 94598 (510) 998 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker,avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> E 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 94549 <br /> Attention Tracy Faulkner Work Order# 9608581 01, 02, 10 Reported Aug 23, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC081596BTEX02A GC081696BTEX02A GC081696BTEX02A GCO81696BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa D Jima D Jirsa <br /> MS/MSD# 960824303 960824303 960824303 960824303 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 8/16/96 8/16/96 8/16/96 6/16/96 <br /> Analyzed Date 8/16/96 8/16/96 8/16/96 8/16/96 <br />' Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 10 95 95 28 <br /> MS % Recovery 100 95 95 93 <br /> Dup Result 10 97 10 30 <br /> MSD % Recov 100 97 100 100 <br />' RPD 00 21 51 69 <br /> RPD Limit 0.25 0-25 0-25 0-25 <br /> LCS# BLK081696 BLK081596 BLK081696 BLK081696 <br />' Prepared Date. 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Analyzed Date 8/16/96 8/16/96 8/16/96 8/16/96 <br />' Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Result 11 11 10 31 <br />' LCS % Recov 110 110 100 103 <br />' 60-140 60-140 60-140r 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 1s analyzed using the same reagents, <br /> SEQU 1A ANALYTICAL preparation and analytical methods employed for the samples The matrix spike 1s 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 is to be used to validate the batch <br /> Kevin Follett <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9608581 EEE <1> <br />