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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> alAnalytical <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> W40 819 Striker Avenue Suttc 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 04, 05, 11-13 Reported Aug 23, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC08199613TEX02A GCO81996BTEX02A GCO81996BTEX02A GCO81996BTEX02A <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 Jirsa D Jirsa <br /> MS/MSD # 960879302 960879302 960879302 960879302 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 8/19/96 8/19/96 8/19/96 8/19/96 <br /> Analyzed Date 8/19/96 8/19/96 8/19/96 8/19/96 <br />' Instrument I D # GCHP2 GC11P2 GCHP2 GCHP2 <br /> Conc Spiked 1Dug/L 10ug/L 10ug/L 30pg/L <br /> Result 10 10 98 20 <br /> MS % Recovery 100 100 98 100 <br /> Dup Result* 94 90 91 27 <br />' MSD % Recov 94 90 91 90 <br /> RPD 62 11 74 11 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK081996 BLK081996 BLK081996 BLK081996 <br />' Prepared Date 8/19/96 8/19/96 8/19/96 8/19/96 <br /> Analyzed Date. 8/19/96 8/19/96 8/19/96 8/19/96 <br />' Instrument I D #. GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked 10ug/L 10ug/L 10ug/L 30pg/L <br /> LCS Result 97 96 93 28 <br /> LCS % Recov.. 97 96 93 93 <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, <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 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 <3> <br />