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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)988-9600 FAX(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(916)921-01x0 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> - <br /> Gettler Ryan/Geostrategles Client Project ID Farmer Unocal SS #2859 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> <Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9806C89 01-06 Reported Jul 23, 1998 <br /> 9806C90 07-10 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes BTEC as TPH <br /> Benzene <br /> OC Batch# GCO62898802002A GC062898802002A GC062898802002A GC062898802002A GCO62898802002A <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 0 Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD #• 8061866 8061866 8061866 8061866 8061866 <br /> Sample Cone. N D N D N D N D N D <br /> Prepared Date 6/28/98 6/28/98 6/28/98 6/28/98 6/28/98 <br /> Analyzed Date. 6/28/98 6/28/98 6/28/98 6/28/98 6/28/98 <br /> Instrument I D #' HP2 HP2 HP2 HP2 HP2 <br /> Cone Spiked 20 pg/L 20 pg/L 20 pg/L 60 pg/L 360 pg/L <br /> Result- 20 20 20 61 320 <br /> .MS % Recovery 100 100 100 102 89 <br /> Dup Result. 18 18 18 57 340 <br /> MSD % Recov.. 90 90 90 95 94 <br /> RPD. 105 105 105 68 61 <br /> RPD Limit: 0-20 0-20 0-20 0-20 0-50 <br /> LCS #: LCS062898 LCS062898 LCS062898 LCS062898 LCS062898 <br /> Prepared Date. 6/28/98 6/28/98 6/28/98 6/28/98 6/28/98 <br /> Analyzed Date, 6/28/98 6/28/98 6/28/98 6/28/98 6/28/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Cone. Spiked. 20pg/L 20pg/L 20pg/L 60pg/L 360pg/L <br /> LCS Result 19 19 19 60 330 <br /> LCS % Recov 95 95 95 100 92 <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 /> 40 EOUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> IAP #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 /> interference,the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager •*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9806C89 GET <1> <br />