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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> 0 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E QC Sample Group 1060740-43 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil&Grease <br /> Method SM 5520 B&F <br /> Analyst D Newcomb <br /> Reporting Units mg/L <br /> Date Analyzed Jul 2, 1991 <br /> QC Sample # Matrix Blank <br /> 070291M <br /> Sample Conc N D <br /> pike Conc <br /> Added 100 <br /> Conc Matrix <br /> Spike 83 <br /> Matrix Spike <br /> %Recovery 83 <br /> Conc Matrix <br /> Spike Dup 83 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 83 <br /> Relative <br /> % Difference 0 <br /> Laboratory blank contained the following analytes None Detected <br /> 1*000IA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Conc of M S D x 100 <br /> Belinda C Vega (Conc of M s + Gonc of M s o) 2 <br /> Laboratory Director 1060740 KEI <7> <br />