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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chrlsta Martmg Work Order # 9710816 07 Reported Oct 27, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC10219713TEX02A GC1021976TEX02A GC102197BTEX02A GC102197BTEX02A GC102197BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Miraftab A.Miraftab A.Miraftab A Miraftab A.Miraftab <br /> MS/MSD# 971098003 971098003 971096003 971098003 971098003 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10yg/L 10Ng/L 10lrg/L 30}eg/L 60,ug/L <br /> Result 97 94 95 29 63 <br /> MS % Recovery 97 94 95 97 105 <br /> Dup Result 99 95 96 29 64 <br /> MSD % Recov 99 95 95 97 107 <br />' RPD 20 11 10 00 16 <br /> RPD Limit 0-25 0-25 0-25 0-25- 0-25 <br /> LCS# BLK102197 BLK102197 BLK102197 BLK102197 BLK102197 <br />' Prepared Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10{rg/L 10pg/L 10pg/L 30ug/L 60pg/L <br /> LCS Result 91 87 89 27 60 <br /> LCS % Recov 91 87 89 90 100 <br /> 60-140 60-140 60-140 6x140 60-140 <br />' LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <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 /> interference,the LCS recovery is to be used to validate the batch <br /> d Herling' <br />' Project Manager *'MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative % Difference 9710816 EEE <6> <br /> z� <br />