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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealia6 Engineering, Inc Client Project ID 'Unocal s/s#5421, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 208-0955 Reported Aug 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 6015/8020 8015/8020 <br /> Analyst AT AJ A.T AT <br /> Reporting Units ug/L ug/L Fig/L pg/L <br /> Date Analyzed Aug 24, 1992 Aug 24, 1992 Aug 24, 1992 Aug 24, 1992 <br /> QC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc . N D N D N D N D <br /> Spike Conc <br /> . Added 20 20 20 60 <br /> Conc Matrix <br /> Spike 19 19 19 61 <br /> Matrix Spike <br /> % Recovery. 95 95 95 102 <br /> Conc. Matrix <br /> Spike Dup - 19 19 20 62 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 95 95 100 103 <br /> Relative <br /> % Difference 00 00 51 16 <br /> Laboratory blank contained the following analytes None Detected <br /> SEOUOI ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> 0 Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Ott 18 O (Conc of M S + Conc of M S D)/2 <br /> Project Manage 2080956 KEI <3' <br />