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It <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> a— ) 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> __1 . l 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategles Client Project ID YUnocal 5886, 180137 85 <br /> -6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9806C26 01-10 Reported Jul 13, 1998 <br /> 9806C27 11, 12 v v <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xyienes BTEXasTPH <br /> Benzene <br /> QC Batch# GCO62798802002A GC062798802-002-A GCO62798802002A GCO62798802002A GC062798802002A <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 # 8061733 8061733 8061733 8061733 8061733 <br /> Sample Conc N D N D NO N D NO <br /> Prepared Date 6/27/98 6/27/98 6/27/98 6/27/98 6/27/98 <br /> Analyzed Date 6/27/98 6/27/98 6/27/98 6/27/98 6/27/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20,ug/L 20pg/L 20ug/L 60Ng/L 360 ug/L <br /> Result 18 19 19 57 340 <br /> MS % Recovery 90 95 95 95 94 <br /> Dup Result 19 19 19 58 330 <br /> MSD % Recov 95 95 95 97 92 <br /> RPD 54 00 00 17 30 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS062798 LCS062798 LCS062798 LCS062798 LC8062798 <br /> Prepared Date 6/27/98 5/27/98 6/27/98 6/27/98 6/27/98 <br /> Analyzed Date 6/27/98 6/27/98 6/27/98 6/27/98 6/27/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L 3601ug/L <br /> LCS Result 18 18 18 54 340 <br /> LCS % Recov 90 90 90 90 94 <br /> LCS 70-130 70-130 70-130 70-130 60.140 <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 /> 0ELAP #1271 fortified with known quantities of specific compounds and subjected to the entire analytical procedure 0 <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 /> eG'ranicher <br /> Project Manager "MS=Matrix Spike, MSD=MS Duplicate, RPO=Relative%Difference 98061326 GET <1 a <br />