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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> 0 Nap (415) 686-9600 0 FAX (415) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave, Stockton <br /> P O Box 9% <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1060740-43 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Deese] <br /> Method EPA 8015 <br /> Analyst JRM <br /> Reporting Units ug/L <br /> Date Analyzed Jul 1, 1991 <br /> QC Sample # BLK070191 <br /> Sample Conc . N D <br />*pike Conc <br /> Added 300 <br /> Conc Matrix <br /> Spike 310 <br /> Matrix Spike <br /> %Recovery 100 <br /> Conc Matrix <br /> Spike Dup 300 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 <br /> Relative <br /> %Difference 33 <br /> Laboratory blank contained the following analytes None Detected <br /> OQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Belinda C Vega (Conc of M S + Cone of M S D)/2 <br /> Laboratory Director 1060740 KEI <5> <br />