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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> prealian Engineering, Inc Client Project lD Unocal, 7303 Pacific Ave, Stockton <br /> 401 Stanwell Drnre, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 212-1179 Reported Jan 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Diesel <br /> Method EPA 8015 <br /> Analyst K Wimer <br /> Reporting Units N9/L <br /> Date Analyzed Jan 7, 1993 <br /> QC Sample# Matrix Blank <br /> Sample Conc N D <br /> Spike Conc <br /> . Added 300 <br /> Conc Matrix <br /> Spike 274 <br /> Matrix Spike <br /> % Recovery, 91 <br /> Conc. Matrix <br /> Spike Dup 275 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 92 <br /> Relative <br /> %Difference: 040 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Laboratory Blank contained tate following analytes None detected <br /> SEQUO ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r Relative%Difference Conc of M S -Conc of M S D x 100 <br /> tt hleffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2-121179 KE1 2> <br />