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' 1Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)986 9673 <br /> �„1 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, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9704171 03 Reported Apr 18, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCO40997BTEX02A GCO40997BTEX02A GCO40997BTEX02A GCO40997BTEX02A GCO40897STEX21A <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# 9703F1403 9703171403 9703F1403 9703F1403 9703F1403 <br />' Sample Cane N D N D N D N D N D <br /> Prepared Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Analyzed Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Instrument LD # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 90 90 91 29 66 <br /> MS %Recovery 90 90 91 97 110 <br /> Dup Result 93 92 9 2 30 67 <br /> MSD % Recov 93 92 92 100 112 <br />' RPD 33 22 11 34 15 <br /> RPD Limit 0-25 0-25 0-25 0-25 0.25 <br /> LCS# BLK040997 BLKM997 BLK040997 BLK040997 BLKG40997 <br />' Prepared Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Analyzed Date 4/9/97 4/9/97 4/9/97 4/9/97 4/9/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 60 p9/1- <br /> LCS <br /> g/LLCS Result 93 92 92 29 65 <br /> LCS % Recov 93 92 92 97 108 <br /> 1 <br /> 60-140 60-140 60-140 50-140 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 /> SEQ�UOjA 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 /> i 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 **MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9704171 EEE <2> <br />