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Sequoia 680 Chesapeake Drivc Redwood City,CA 9400., (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 Stnkcr Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler'Ryan/Geostr"ategies v Client Project'ID vr+ Unocal"4707 Paclflc Ave , Stoc <br /> ' 6747 Sierra Court, Ste J Matrix Liquid z' <br /> ,'Dublin, CA 94568 sL <br /> ,,Attention Greg Gurss Work Order# 96071-188 -01, -02 Reported Aug 13, 1996 { <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO801966TEX17A GCO80106BTEX17A G0080196BTEX17A 00080196BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa 0 Jirsa D J1rsa <br /> MS/MSD # G9607E21-05 G9607E21-05 G9607E21-05 G9607E21-05 <br /> Sample Cone NO N D N D N D <br /> Prepared Date 8/1/96 8/1/96 8/1/96 8/1/96 <br /> Analyzed Date 8/1/96 8/1/96 8/1/96 8/1/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. 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 11 11 10 30 <br /> MSD % Recov 110 110 100 100 <br /> RPD 95 95 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> "d, <br /> LCS # GBLK080196B GBLK080196B GBLK080196B GBLK080196B <br /> Prepared Date 8/1/96 8/1/96 8/1/96 8/1/96 <br /> Analyzed Date- 8/1/96 8/1/96 8/1/96 3/1/96 <br /> Instrument 1 D.# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result' 10 10 10 30 <br /> LCS % Recov 100 100 100 100 <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 is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> .SE000I ALYTICAL 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 1s to be used to validate the batch <br /> Mike Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br />