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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave, Stockton <br /> 0,401 Stanwell Drive, Surte 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E QC Sample Group 2121171-74 Reported Jan 11, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst A.T A.T A T XT <br /> Reporting Units N9/L u9/L u9/L J19/L <br /> Date Analyzed Jan 5, 1993 Jan 5, 1993 Jan 5, 1993 Jan 5, 1993 <br /> QC Sample# 212-1190 212-1190 212-1190 212-1190 <br /> Sample Cone N D N D N D N D <br /> Spike Cone <br /> • Added 20 20 20 600 <br /> Cone Matrix <br /> Spike* 22 21 21 68 <br /> Matrix Spike <br /> % Recovery, 110 105 105 113 <br /> Cone. Matrix <br /> Spike Dup . 23 22 22 69 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 115 110 110 115 <br /> Relative <br /> %Difference 44 47 47 1 5 <br /> Laboratory blank contained the following analytes None Detected <br /> SEIQU IA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of M S -Conc of M S D x 100 <br /> colt A Chieffo (Conc of M S + Conc of M S D)/2 <br /> Project Manage 2121171 KEI <3> <br />