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Sequoia <br /> 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94548 (514) 988 9600 FAX(5E0)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blame Tech Services,Inc Client Project ID Chevron 9-8264 /961105-C1 <br /> -985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9611258-04 Reported Nov 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC110896BTEX07A GC110896BTEX07A GC110896BTEX07A GC110896BTEX07A <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 #: 961026102 961026102 961026102 961026102 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked 14pg/L 1opg/L 10pg/L 30ug/L <br /> Result 10 10 11 32 <br />. MS % Recovery 100 100 110 107 <br /> Dup Result 11 11 11 33 <br /> MSD % Recov 110 110 110 110 <br /> RPD. 95 95 00 31 <br /> RPD Limit. 0-25 0.25 0-25 0-25 <br /> LCS#. BLK110896 BLK110896 BLK110896 BLK110896 <br /> Prepared Date. 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Analyzed Date 11/8/96 11/8/96 11/8/96 11/8/96 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked. 10pg/L 10pg/L 10pg/L 30jig/L <br /> LCS Result 10 11 11 33 <br /> LCS % Recov 100 110 110 110 <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70130 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 /> Peggy <br /> OIA ANA preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compoundq and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> Pennerct Manag r **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9611258 BLA <2> <br />