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680 Chesapeake Drive kedwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 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 Christa Marting Work Order# 9710816 01, 03, 04 Reported Oct 27, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC102197BTEX21A GC102197BTEX21A GC102197BTEX21A GC102197BTEX21A GC102197BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <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 971098003 971098003 971098003 <br /> Sample Conic N D N D N D N D ND <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 # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br />' Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 60 ug/L <br /> Result 92 89 88 26 58 <br /> MS % Recovery 92 89 88 87 97 <br /> Dup Result 93 90 90 27 60 <br /> MSD % Recov 93 90 90 90 100 <br />' RPD 11 11 22 38 34 <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 # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conic Spiked 10 ug/L 10 ug/L 10 pg/L 30 ug/L 60 ug/L <br /> LCS Result 90 89 88 26 54 <br />' LCS % Recov 90 89 88 87 90 <br /> 60-140 60-140 60-140 60-140 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 anaiytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subfected 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 /> tt interference,the LCS recovery is to be used to validate the batch <br /> I Ichar�er Ing <br />' Project Manager **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative %Difference 9710816 EEE <2> <br />