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4 t4 fk <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM Concord, California 94520 <br /> t <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kapreallan Engineering, Inc Client Project ID Unocal/7303 Pacific Ave, Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E QC Sample Group 1121160-1163 Reported Jan 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes Diesel Oil and Grease <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 SM5520 <br /> Analyst K N/J F K N/J F K N/J F K N/J F A.Tuzon D Newcomb <br /> Reporting Units Yg/L ug/L uIt/L ug/l- ug/L ugly <br /> Date Analyzed Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 8, 1992 Jan 3, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone • N D N D N D N D N D N D <br /> Spike Cone <br /> Added 20 20 20 60 300 100 <br /> Cone Matrix <br /> Spike 21 20 21 65 270 92 <br /> a <br /> Matrix Spike <br /> %Recovery 105 100 105 108 90 92 <br /> Cone Matrix <br /> Spike Dup 21 20 21 63 270 93 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 105 100 105 105 91 93 <br /> Relative <br /> %Difference 00 00 00 31 10 10 <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 -Cana of M S D x 100 <br /> Belinda C Vega (Cont of M S + Conc of M S D)/2 <br /> Laboratory Director 1121160 KEI <8' <br />