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Sequoia 680 Chesapeake Dnve Redwood City ra 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94596 (510) 988 9600 FAX(5t0)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 08, 09 Reported Oct 27, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC102097BTEX17A GC102097BTEX17A GC102097BTEX17A GC102097BTEX17A GC102097BTEX17A <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# 971073403 971073403 971073403 971073403 971073403 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Analyzed Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br />' Conc Spiked 10 ug/L 10 jig/L 10jug/L 30pg/L 60pg/L <br /> Result 93 91 90 27 63 <br /> MS % Recovery 93 91 90 90 105 <br /> Dup Result 90 90 87 26 61 <br /> MSD % Recov 90 90 87 87 102 <br /> RPD 33 11 34 38 32 <br /> RPD Limit 0-25 0-25 0-25 0-25- 0-25 <br /> LIDS # BLK102097 BLK102097 BLK102097 BLK102097 BLK102097 <br />' Prepared Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Analyzed Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Instrument 1.D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br />' Conc Spiked 10p9/1- 10 p9/1- 10pg/L 30Ng/L 60pg/L <br /> LCS Result 9 0 90 8 8 26 61 <br /> LCS % Recov 90 90 88 87 102 <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 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 /> VRichard <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 /> Herlin <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative % Difference 9710816 EEE <7> <br />