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/ - ' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 F-il{(415) 364-9233 <br /> �..�� 414 N Wiget Lane Walnut Creek CA 94598 (510) 9889600 FAX(510) 938 9673 <br /> X111 Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br />' B A Engineering Science&Tech Client Project ID Exxon 7-3942 / 83739421307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br />' Attention Tracy Faulkner Work Order# 9602-A05 11-13, 17, 18, 19 Reported Fein 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br />' QC Batch# GCO21696BTEX21A GCO21696BTEX2IA GCO21696BTEX2IA GCO216966TEX21A <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 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 1.101 #: GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10pg/L long/L 10,Ltg/L 30pg/L <br /> Result 84 79 67 20 <br /> MS % Recovery- 84 79 67 67 <br /> Dup. Result. 95 95 9 3 28 <br /> MSD % Recov.• 95 95 93 93 <br />' RPD 12 18 33 33 <br /> RPD Limtt 0-50 G-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.# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10 ug/L 10 ug/L 10 ug/L 30 Ng/L <br /> LCS Result 92 90 87 26 <br /> LCS % Recov 92 90 87 87 <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-tree matrix that is analyzed using the same reagents <br /> SEQUOIA 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 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 /> Kevin Follett <br /> Project Manager ""MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9602A05 EEE <4> <br />