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w 94063 415 364 9600 FAX(415) 364 9233 <br />' Sequoia 680 Chesapeake Dnve Redwood City CA ( ) <br /> `1 404 N Wiget Lane Walnut Crcek CA 94598 (510) 988 9600 FAX(510) 988 %73 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' E A Engineering Science &Tech Client Project 10 Exxon 7-0137/5150137 1300 <br /> 9 9 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order# 9604H89 04, 07, O8 Reported May 6, 199fi <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> OC Batch# GCO430966TEX20A GC043096STEX20A GC043096BTEX20A GCO43096BTEX20A <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 # 9604DO302 960400302 9604DO302 960400302 <br /> Sample Conc N D N D N D 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 D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 Ng/L 10 jig/L 10 ug/L 30 pg/L <br /> Result 95 94 97 29 <br /> MS % Recovery 96 94 97 97 <br /> Dup Result 96 96 98 29 <br /> MSD % Recov 96 96 98 97 <br /> RPD- 00 21 10 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS #- BLK043096 BLKD43096 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 # GCHP20 GCHP20 GCHP20 GCHP20 <br />' Conc Spiked 10ug/L lopg/L 10Ng/L 30ug/L <br /> LCS Result- 77 78 79 24 <br />' LCS % Recov. 77 78 79 80 <br />' LCS 70-130 70.130 70-130 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS 1s a control sample of known,interferent-tree matrix that Is analyzed using the same reagents <br /> SECU IA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantrtles 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 /> evin Follett <br />' Project Manager *'MS=Matnx Spike, MSD-MS Duplicate,RPD-Relative%Difference 9604H89 EEE c2> <br />