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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM - Concord, California 94520 <br /> lot <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> Kapreall n Engineering, Inc Client Project lD Unocal Sulk Plant, 2835 Navy Or, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord,CA 94520 <br /> Attention Mardo Kapreahan, P E CC Sample Group 2071114-1116 Reported Aug 6, 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 EPAS015 <br /> Analyst M Nipp M Nipp M Nipp M Nipp K Wimer <br /> Reporting Units ug/L ug/L Ng/L ug/L Ng/L <br /> Date Analyzed Aug 4, 1992 Aug 4, 1992 Aug 4, 1992 Aug 43 1992 Aug 4, 1992 <br /> QC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone N D N D N D N D N D <br /> . Spike Conc. <br /> Added' 10 10 10 30 10 <br /> Conc Matrix <br /> Spike. 11 11 11 33 101 <br /> Matrix Spike <br /> % Recovery 110 110 110 110 101 <br /> Conc Matrix <br /> Spike Dup . 10 11 10 32 101 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 110 100 102 101 <br /> Relative <br /> % Difference. 9 5 0 0 9 5 31 0 0 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUOIA 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 x 100 <br /> OtC9hieffo (Conc of M S + Conc of M S D)/2 2071114,KEI <,I> <br /> Project Manager <br />