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r. <br /> Sequoia 680 Chesapeake Drive Rcdwood Cay,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W.get 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(916)921 0100 <br /> 4+ ,i a <br /> ` ettler Ryan/Geostrategies Client 'roject ID Unocal 4707 Pacific Avea e 6981+ c <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> "Dublin, CA 94568 z, <br /> d <br /> ,Attention Greg Gurss Work Order# 9601 F73 -01, -02 Reported Jan 29, 1996 <br /> ,}.`�. mo�ohGikt'�'a� <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC012596BTEX17A GCO12596BTEX17A GCO12596BTEX17A G0012596BTEX17A <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# G9601763-03C G9601763-030 G9601763-030 G9601763-03C <br /> Sample Conc N D N D N D N D <br /> Prepared Date 1/25/96 1/25/96 1/25/96 1/25/96 <br /> Analyzed Date 1/25/96 1/25/96 1/25/96 1/25/96 <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 98 95 96 27 <br /> MS % Recovery 98 95 96 90 <br /> Dup Result. 89 88 90 26 <br /> MSD % Recov. 89 88 90 87 <br /> RPD. 96 77 65 38 <br /> RPD Limit- 0-50 0-50 0-50 0-50 <br /> •Ryi..vGwi>uG. +} wry mvnrv1} ♦ n M1t ti4 v. •mm� 4n4nvr.+ GvvY`tivnvr$v{v�ivn}vn�.`+vtinG.iGiGv.Gn ♦v4nm♦ +r ..n.vCdM+dn 'a4rM r+AR1Gw7vrvxnv$.'SGYy4 <br /> LCS # GBLK012596A GBLK012596A GBLK012596A GBLK012596A <br /> Prepared Date 1/25/96 1/25/96 1/25/96 1/25/96 <br /> Analyzed Date. 1/25/96 1/25/96 1/25/96 1/25/96 <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. 94 95 95 28 <br /> LCS % Recov. 94 95 95 93 <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-tree 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 /> ike Gregory <br /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9601F73 GET <1> <br />