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' Sequoia 680 Chesapcakc Onve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wipt Lane Walnut Creek CA 94598 (010) 988-9600 FAX(5[0) 988 9673 <br /> Analytical 819 Sinker Avcrue Suicc 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 6 W40 <br />' E A Engineering 9 Science &Tech Client Project ID Exxon 7-0137 / 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order# 96041-189 01-03, 05, 06, 09 Reported May 6, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> OC Batch# GC043096BTEX2IA 00043096BTEX21A GCO43096STEX21A GC043096STEX21A <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 .I woo ,1 woo .I woo <br /> MS/MSO# 960400302 9604DO302 9604DO302 960400302 <br />' Sample Conc N D N D N 0 N D <br /> Prepared Date 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I ❑ # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10,tg/L 1opg/L 10,ug/L 30Ng/L <br /> Result 82 97 96 24 <br /> MS % Recovery 82 97 96 97 <br /> Dup Result 81 94 94 28 <br /> MSD % Recov 81 94 94 93 <br />' RPD 12 31 21 35 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> LCS # BLK043096 BLK043096 BLK043096 BLK043096 <br />' Prepared Date 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br />' Conc Spiked 10 pg/L 10 frg/L 10 pg/L 30 Ng/L <br /> LCS Result 83 99 10 30 <br />' LCS % Recov .. 83 99 100 100 <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 /> Aft SEM IA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> FIfortified 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 *"NIS aMatrix Spike, MSD-MS Duplicate, RPD-Relative % Difference 9604H89 EEE <1> <br />