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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM + Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 v <br /> Kaprealian Engineering, Inc Client Project ID Unocal,7303 Pacific Ave,Stockton <br /> P O Box 996 <br /> Benicia, CA 94610 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1030899-902 Reported Apr 10, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil 8 Grease <br /> Method SM 5520 BBF <br /> Analyst S Le <br /> Reporting Units ppm <br /> Date Analyzed Apr 5, 1991 <br /> QC Sample# BLK032991 <br /> Sample Conc : N D <br /> Spike Conc <br /> Added* 100 <br /> Conc Matrix <br /> Spike 95 <br /> Matrix Spike <br /> %Recovery 95 <br /> Conc. Matrix <br /> Spike Dup : 98 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 98 <br /> Relative <br /> % Difference 3 1 <br /> 0E000IA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conn Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Belinda C Vega (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director 1030899 KEI <9> <br />