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f . , Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4F5) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX(5t0}988 9673 <br /> J,lly Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> I, <br /> E A Engineering Science &Tech Client Project ID Exxon 7-3942 / 8373942 1307 <br /> 3468 Mt Diablo Blvd , Ste 6-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order# 9602A05 01. 05-10 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21696BTE 20A GCO21696ETEX20A GCO21596BTEX20A GCO21696BTE 20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# 960245102 960245102 960245102 960245102 <br /> Sample Conc N 0 N D N D N D <br /> Prepared Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Analyzed Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument 1 D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L lopg/L 10pg/L 30Ng/L <br /> Result 10 10 10 30 <br /> MS % Recovery 100 100 100 100 <br /> Dup Result 11 10 10 30 <br /> MSD % Recov 110 100 100 100 <br />' RPD 95 00 00 00 <br /> RFD Limit 0-50 0-50 0-50 0-50 <br /> LCS# BLK021696 OLK021696 BLK021696 BLK021696 <br /> I Prepared Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Analyzed Date 2/16/96 2/16/96 2/16/96 2/16/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 yg/L 10 pg/L 10).tg/L 30,ug/L <br /> LCS Result 10 99 10 30 <br /> LCS % Recov 100 99 100 100 <br /> I <br /> LCS 70-130 70-130 70-130 70-130 <br />' Control Umits <br />' Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> SEQlJO A 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 9602A05 EEE <1> <br /> 1 <br />