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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 Bulk Plant#0950, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group #2100024 Reported Oct 29, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> PH Sulfide Flashpoint Ryanide <br /> Method EPA 9045 EPA 9030 EPA 1010 EPA 9010 <br /> Analyst Yolanda A K Follett K Follett NZ <br /> Reporting Units N/A mg/kg N/A mg/kg } <br /> Date Analyzed Oct 26, 1992 Oct 26, 1992 Oct 28, 1992 Oct 28, 1992 <br /> QC Sample # 210-3589 209-4408 210-3713 210-3565 <br /> Sample Conc 76 N D >100°C 1 1 <br /> Spike Conc <br /> . Added N/A 1300 N/A 29 <br /> Conc Matrix <br /> Spike N/A 1500 N/A 39 <br /> Matrix Spike <br /> % Recovery N/A 115 N/A 97 <br /> Conc Matrix <br /> Spike Dup.: 72 1300 >100°C 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery N/A 100 N/A 107 <br /> Relative <br /> % Difference 54 14 00 74 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc 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 Manager ; 2100024 KEI <br />