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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)985-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North,Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettier Ryan%Geostrategies v nn AClient Project Unocal Unocal Former Factlity#0187 <br /> 1,6747 Sierra Court, Ste J Matrix Liquid i <br /> �Dublin, CA 94568 <br /> i <br /> 'Attention Deanna Harding Work Order# 9808A40 01-09 Reported Sep 21, 1998 fi <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes BTECasTPH <br /> Benzene <br /> QC Batch#: GCO82898802005A GCO82898802005A GU82898802OW GCO82998802005A GCO82898802005A <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 D Newcomb <br /> MS/MSD# 8081629 8081629 8081629 8081629 8081629 <br /> Sample Cone : NO N D ND NO N D <br /> Prepared Date 8/28/98 8/28/98 8/28/98 8/28/98 8/28/98 <br /> Analyzed Date: 8/28/98 8/28/98 8/28/98 8/28/98 8/28/98 <br /> Instrument I.D.# HP5 HP5 HP5 HP5 HP5 <br /> Cone. Spiked: 20Y9/L 20pg/L 20pg/L 60pg/L 230pg/L <br /> Result' 18 18 18 57 250 <br /> 0 MS % Recovery 90 90 90 95 109 <br /> Cup Result 18 18 18 57 240 <br /> MSD %Recov - 90 90 90 95 104 <br /> RPD: 00 00 00 40 41 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LCS082898 LCS082898 LCS082898 LCS082898 LCS082898 <br /> Prepared Date. 8/28/98 8/28/98 8/28/98 8/28/98 8/28/98 <br /> Analyzed Date. 8/28/98 8/28/98 8/28/98 8/28/98 8/28/98 <br /> Instrument I.D # HP5 HP5 HP5 HP5 HP5 <br /> Cone. Spiked 20 pg/L 20 Pg/L 20 pg/L 60 pg/L 230 pg/L <br /> LCS Result: 16 17 17 53 230 <br /> LCS % Recov - 80 85 85 88 100 <br /> MS/M Di— <br /> LCS 70-130 70-130 70.130 70-130 6x140 <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 /> OELAP#1271 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 /> To FG1ranit er interference,the LCS recovery Is to be used to validate the batch <br /> Project Manager *"MS=Matrix Spike, MSD a MS Duplicate,RPD s Relative%Difference 980SA40 GET <i> <br />