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+ ( \ Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) gas 9600 FAX(510)988 9673 <br /> %07 Analytical <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(9t6)921-0100 <br /> ,Gettler Ryan/Geostrategies Client Project ID r r Unocal%4707 Pacific Ave <br /> F°3164 Gold Camp Drive #240 Matrix Liquid }" <br /> Rancho Cordova, CA 95670 <br /> ,,Attention Greg Gurss Work Order# 9609E95 01, 02 Reported Oct 2,, 119961; <br /> •1r 4r vv +r r4 s+vv n r vrvr tir v M1 vi <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GCO92796BTEX17A GC092796BTEX17A GCO92796BTEX17A GCO92796BTEX17A <br /> Analy Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Burton R Burton R Burton R Burton <br /> MS/MSD#. 9609A1903 9609A19W 9609A1903 9609A1903 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 9/27/96 9/27/96 9/27/96 9/27/96 <br /> Analyzed Date 9/27/96 9/27/96 9/27/96 9/27/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked: 10ug/L loNg/L 10 frg/L 30ug/L <br /> Result* 12 12 11 33 <br /> MS %Recovery 120 120 110 110 <br /> Dup Result 12 11 10 32 <br /> MSD % Recov 120 110 100 107 <br /> RPD 00 87 95 31 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK092796 BLK092796 BLKG92796 BLK092796 <br /> Prepared Date 9/27/96 9/27/96 9/27/96 9/27/96 <br /> Analyzed Date- 9/27/96 9/27/96 9/27/96 9/27/96 <br /> Instrument i D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10Pg/L 10ftg/L 10pg/L 30pg/L <br /> LCS Result 11 11 10 31 <br /> LCS % Recov. 110 110 100 103 <br /> M D 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70130 70130 70130 <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 <br /> YTICAL 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 /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9609E95 GET <1> <br />