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i <br /> Sequoia ,0 Chesapeake Dnvc Redwood city,CA 94063 650) 364 9600 FAX(650)364 9233 <br /> 1:1) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> fall>7 Analytical 819 Sinker Avenue Suite B Sacramento CA 95834 (916) 92t 9600 FAX(916)921-0100 <br /> Oettler Ryan/Geostrategies Client Project ID Unocal SS#0187 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9802A45 -01, 03-08, 10 Reported Mar 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22598802005A GCO22598802005A GCO22598802005A GCO22598802005A GCO22598802005A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb 0 Newcomb <br /> MS/MSD# 8021374 8021374 8021374 8021374 8021374 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Analyzed Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20ug/L 20Ng/L 20pg/L 60ug/L 310fig/L <br /> Result 22 22 22 69 280 <br /> orS % Recovery 110 110 110 115 90 <br /> Dup Result 20 20 20 62 310 <br /> MSD % Recov 100 100 100 103 100 <br /> RPD 95 95 95 11 10 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LCS022598 LCS022598 LCS022598 LCS022598 LCS02-2598 <br /> Prepared Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Analyzed Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Instrument I D# HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20ug/L 20Ng/L 60pg/L 310pg/L <br /> LCS Result- 18 19 18 58 300 <br /> LCS % Recov 90 95 90 97 97 <br /> 60-140 60.140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70.130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> 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 /> 1roejectManag,er MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9802ms GET <I> <br /> r� <br />