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r <br /> SEQUOIA ANALYTICAL <br /> NO1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> lCapreallan Engineering, Inc Client Project ID Unocal, 5606 Pacific Ave, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2121175-78 Reported Jan 12, 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 AT AT <br /> Reporting Units pg/L ug/L Ng/L ug/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 60 <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 15 <br /> Laboratory blank contained the following analytes None Detected <br /> OSEQU ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> r Relative%Difference Cone of M S -Cone of M S D x 100 <br /> cost A hie o (Cone of M S + cone of M S D)/2 <br /> Project Manager 2121175 KEl <s> <br />