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SEQUOIA ANALYTICAL. <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686 9600 • FAX (510) 686-9689 <br /> iKaprealian Engineering, Inc Client Project ID Unocval, 2835 Navy Drive, Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealtan, P E QC Sample Group 2040920-922 Reported Apr 24, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 EPA8015 EPA8015 <br /> Analyst KN KN KN KN A T/SL A-T/SL A.T/SL. <br /> Reporting Units mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed Apr 22, 1992 Apr 22, 1992 Apr 22, 1992 Apr 21, 1992 Apr 23, 1992 Apr 23, 1992 Apr 23, 1992 <br /> Sample # 204-0920 204.0921 204-0922 Blank 204-0920 204-0921 204-0922 <br /> Surrogate <br /> %Recovery. 82 83 89 95 301 191 160 <br /> i <br /> SEQUOIA ANALYTICAL %Recovery Z,onc of M S -Uonc of Sample x 100 <br /> pike Cone Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Scott A Cnleffo Cone of M S t Gonc of M S D) 2 <br /> Project Manager 204150 KEl <,> <br />