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a� + <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc talent Project ID Unocal/7303 Pacific Ave, Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kapreallan, P E QC Sample Group 112-1160 Reported Jan 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchioro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen <br /> Reporting Units ug/L ug/L ug/L <br /> Date Analyzed Jan 3, 1992 Jan 3, 1992 Jan 3, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone : N D N D N D <br /> Spike Cone <br /> Added 10 10 10 <br /> Cone Matrix <br /> Spike 12 11 13 <br /> Matrix Spike <br /> %Recovery 120 110 130 <br /> Cone Matrix <br /> Spike Dup 12 10 13 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 120 100 130 <br /> Relative <br /> % Difference 00 95 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br />�1 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of MSD x 100 <br /> Belinda C Vega (Cone of M S + Cone of M S D) 2 <br /> Laboratory Director 1121160 KEI <7> <br />