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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> rV� 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 815 Striker Avenue,Suite 8 Sacramento, CA 95834 (9t6) 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# 9611209 16, 17, 19, 20 Reported Nov 14, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC110896BTEX20A GC110896BTEX20A GC110896BTEX20A GC110896BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. G Fish G Fish G Fish G Fish <br /> MS/MSD# 961118408 961118408 961118408 961118408 <br />' Sample Conc . N D ND N D N D <br /> Prepared Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date. 11/8/96 11/8/96 11/8/96 11/8/96 <br />' Instrument I.D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked. 10ug/L 10pg/L 10.ug/L 30ug/L <br /> Result. 11 93 87 26 <br /> MS % Recovery 110 93 87 87 <br /> Dup Result 11 94 90 27 <br /> MSD % Recov.. 110 94 90 90 <br /> RPO 00 1t 34 38 <br /> RPD Limit 0-25 0.25 0-25 0-25 <br /> S ♦ y} <br /> LCS#. BLK110896 BLK110896 BLK110896 BLK110896 <br />' Prepared Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date. 11/8/96 11/8/96 11/8/96 11/8/96 <br />' Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 pg/L 10 fig/L 10 fig/L 30 fig/L <br /> LCS Result- 11 90 87 25 <br />' LCS % Recov - 110 90 87 83 <br />' 60.140 M140 60-140 60.140 <br /> LCS 70-130 70.130 70-130 70-130 <br /> Control Limrts <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 /> Kevin FollettInterference,the LCS recovery 1s to be used to validate the batch <br />' Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9611209 EEE <6> <br />