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Sequoia 680 Chesapeake Drive 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) 988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Solid <br />' Lafayette, CA 94549 V k <br /> Attention K Kyriacous Work Order# 9703408 01, 02 Reported k Mar 22, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloro- Trichloro Chloro- <br />' ethene ethene Benzene <br /> QC Batch# GCO311978010EXA GC0311978010EXA GCO311976010EXA <br /> Analy Method EPA 8010 EPA 8010 EPA 6010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br />' Analyst E Cunanan E Cunanan E Cunanan <br /> MS/MSD # 970212401 970212401 970212401 <br />' Sample Conic N D 1500 N D <br /> Prepared Date 3/11/97 3/11/97 3/11/97 <br /> Analyzed Date 3/12/97 3/12/97 3/12/97 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br />' Conc Spiked 25 fig/Kg 25 fig/K9 25Yg/K9 <br /> Result 22 1100 19 <br /> MS %Recovery 88 00 76 <br /> Dup Result 21 1200 18 <br /> MSD % Recov 84 00 72 <br />' RPD 47 87 54 <br /> RPD Limit 0-25 0-25 0-25 <br /> LCS# BLK031397BS BLK0313978S BLK031397BS <br />' Prepared Date 3/13/97 3/13/97 3/13/97 <br /> Analyzed Date 3/13/97 3/13/97 3/13/97 <br /> Instrument i D # GCHP9 GCHP9 GCHP9 <br />' Cork Spiked 25 Ng/Kg 25 Ng/Kg 25frg/K9 <br /> LCS Result 30 30 26 <br /> LCS % Recov 120 120 104 <br /> 60-140 60-140 60-140 <br />' LCS 65-135 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 /> 5 the recovery of analytes from the matrix spike does not tali within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> even Follett **MS=Matrix Spike,MSD=MS Duplicate,RPD-Relative�6 Difference <br /> Project Manager Page 1 of 2 9703408 EEE <1> <br />