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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project 1D Unocal #5421, 7303 Pacific Ave, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2110456-459 Reported Nov 24, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel Oil and Grease <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 SM5520 <br /> Analyst AT AT A T A.T K Wimer D Newcomb <br /> Reporting Units ug/l ug/l pg/L M9/l u9/L mg/l <br /> Date Analyzed Nov 13, 1992 Nov 13, 1992 Nov 13, 1992 Nov 13, 1992 Nov 19, 1992 Nov 18, 1992 <br /> OC Sample# 211-0456 211-0456 211-0456 211-0456 Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D N D N D N D <br /> Spike Conc. <br /> Added 20 20 20 60 300 100 <br /> Conc Matrix <br /> Spike 19 21 21 64 283 96 <br /> Matrix Spike <br /> %Recovery 95 105 105 106 94 96 <br /> Conc Matrix <br /> Spike Dup ' 18 21 22 64 298 97 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 105 110 106 99 97 <br /> Relative <br /> % Difference 54 00 46 00 52 1 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Laboratory Blank contained the following analytes None detected <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> C*AhO (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2110456 KEi <b> <br />