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M <br /> Sequoia * 680 Chesapeake Drive Redwood City,CA 94 (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 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(9t6)921 0100 <br /> i <br /> S;Gettler'Rya6/Geostrategies Client Project ID Unocal 6681, 4707 Siockton ' <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> -Attention Greg Gurss Work Order# 96041758 -01, -02 Reported May 2, 1996}1 <br /> r {v x i rr r r r r { . 1 r M1 u s r N s ♦ , ` 4 . . { r r { xr hr}i` <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC042596BTEX17A GC042596BTEX17A GC042596BTEX17A GC042596BTEX17A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# G9604923-01A G9604923-DIA G9604923-01A G9604923-01A <br /> Sample Conc . N D N D N D N D <br /> Prepared Date 4/25/96 4/25/96 4/25/96 4/25/96 <br /> Analyzed Date 4/25/96 4/25/96 4/25/96 4/25/96 <br /> Instrument I D.# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 10 10 10 30 <br /> MS % Recovery 100 100 100 100 <br /> Dup. Result 98 95 95 28 <br /> MSD % Recov 98 95 95 93 <br /> RPD 20 51 51 69 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # GBLK042596A GBLK042596A GBLK042596A GBLK042596A <br /> Prepared Date 4/25/96 4/25/96 4/25/96 4/25/96 <br /> Analyzed Date 4/25/96 4/25/96 4/25/96 4/25/96 <br /> Instrument i D.# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 10 10 10 31 <br /> LCS % Recov 100 100 100 103 <br /> LCS 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 /> 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 /> Mike Gregory <br /> Project Manager **IVIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative %Difference 9604F58 GET <I> <br />