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'SEQUOIA ANALYTICAL <br /> 7900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> *aprealian Engineering, IncH Client 'roject fDA Unocal Sulk Plant,�2835'Navy Or, Stockton x M <br /> ,4()l Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E OC Sample Group 2070681-684 Reported Aug 4, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst AT AT AT AT K Wimer <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Jul 31, 1992 Jul 31, 1992 Jul 31, 1992 Jul 31, 1992 Aug 4, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc . N D N D N D N D N D <br /> . Spike Conc. <br /> Added, 040 040 040 1 2 10 <br /> Conc Matrix <br /> Spike 040 040 040 1 3 101 <br /> Matrix Spike <br /> % Recovery 100 100 100 108 101 <br /> Conic. Matrix <br /> Spike Dup 040 041 041 1 3 101 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 100 103 103 111 101 <br /> Relative <br /> % Difference 0 0 25 2 5 31 0 0 <br /> Laboratory blank contained the following analytes Mone Detected <br /> WEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D X100 <br /> Gott A Clileffo (Conc of M S f Conc of M S D 1/2 , <br /> Project Manager <br /> i <br />