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. Sequoia 680 Chesapeake Dnve Rcdwood City 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 /> 11160 Analytical 819 Straker Avenue Suitc 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921-0100 <br /> r <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942 /8373942 1307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br />' Attention Tracy Faulkner Work Order# 9602A05 16 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br />' QC Batch# GCO21696STEX1713 GCO21696BTEX17B GCO21696STEX17B GCO21696BTE"178 <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/MSO# 960243502 960243502 960243502 960243502 <br /> Sample Conc N D 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 I.D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10ftg/L 10pg/L 30pg/L <br /> Result. 95 95 95 29 <br /> MS % Recovery 95 95 95 97 <br /> Dup. Result 96 10 99 30 <br /> MSD % Recov 98 100 99 100 <br />' RPD 31 51 41 34 <br /> RPD Limit 0-50 0.50 0-50 0-50 <br />' LCS# BLK021696 BLK021696 BLK021696 BLK021696 <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 I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked: lopg/L lopg/L lops/L 30pg/L <br />' LCS Result 10 10 99 30 <br /> LCS % Recov.. 100 100 99 100 <br /> LCS 70-130 70-130 70-130 70-130 <br />' Control LlmdS <br />' Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix splice 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 9602A05 EEE <5> <br />