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. � 91 _ . <br /> SEQUOIA ANALYTICAL. <br /> 1900 Bates Avenue • Suite LM • Concord,Cakforn'a 94520 <br /> (5101 686.9066 FAX(610)6B6.9689 <br /> ERM-West(Sacramento) Client Project ID: Catellus-Stockton#1221.07 <br /> 2001 P Street,Suite 200 <br /> Sacramento,CA 95814 <br /> .Attention: Shannon Sadler OC Sample Group: 1090775-80,1399-400 Reported: Sep 27, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA8015/8020 EPA3015/6020 EPA8015/8020 EPA8015/8020 <br /> Analyst: R.Halsne R.Halsne R.Halsne R.Halsne <br /> Reporting Units: pg/L pg/L pg/L pg/L <br /> Date Analyzed: Sep 13. 1991 Sep 13, 1991 Sep 13, 1991 Sep 13, 1991 <br /> OC Sample#: Matrix Blank Mairix Blank Matrix Blank Matrix Blank <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 20 20 20 60 <br /> { Conc.Matrix <br /> Spike: 23 21 23 75 <br /> Matrix Spike <br /> %Recovery: 120 110 120 130 <br /> Conc.Matrix <br /> Spike Dup.: 25 23 25 81 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 130 120 130 140 <br /> Relative <br /> %Difference: 8.3 8.3 8.3 7.7 <br /> SEQUOIA ANALYTICA %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> �•— <br /> 6ulla <br /> Spike Conc.ACtled <br /> Relative%Difference: Conc.of MS.-Conc,of M.S.D. x 100 <br /> .Malers ein (Cone.o1 M.S.+Conc.of M.S.D.)/2t Manager 1090775.ERS <>> <br />