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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1460 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 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9703032 03. 04 Reported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO30797BTEX06A GC030797BTEX06A GC030797BTEX06A GC030797BTEX06A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst A. Porter A Porter A Porter A.Porter <br /> MS/MSD# 9702C5701 9702C5701 9702135701 970205701 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Instrument l D # GCHP6 GCHP6 GCHP6 GCHP6 <br />' Conc Spiked 10yg/L 10pg/L 1p frg/L 30ug/L <br /> Result 97 98 10 29 <br /> MS % Recovery 97 98 100 97 <br /> Dup Result 99 99 10 30 <br /> MSD % Recov 99 99 100 100 <br /> RPD 20 10 00 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK030797BSA BLK030797BSA LK030797BSA BLK030797BSA <br />' Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 <br />' Conc Spiked 10 yg/L 10yg/L 10 pg/L 30 ug/L <br /> LCS Result 94 94 96 28 <br />' LCS %Recov 94 94 96 93 <br /> 60-140 60-140 60-140 60-140 <br />' LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOI ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ,�f 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 /> Ke in Follett <br /> Project Manager !"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9703032 EEE <2> <br />