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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> RESNA Client Project 1D W4801, PG&E Stockton <br /> 1710 Main Street <br /> EScalon, CA 95320 <br /> Attention Lois Frantz QC Sample Group 3A46301 Reported Feb 5, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil&Grease <br /> Method SM 5520 EF <br /> Analyst M Shkidt <br /> Reporting Units mg/kg <br /> Date Analyzed Feb 2, 1993 <br /> QC Sample# BLK020293 <br /> Sample Cone N D <br /> Spike Cone <br /> Added. 1000 <br /> Cone Matrix <br /> Spike 760 <br /> Matrix Spike <br /> % Recovery 76 <br /> Cone Matrix <br /> Spike Dup.: 720 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 72 <br /> Relative <br /> % Difference 54 <br /> aEGUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample X100 <br /> Spike Cone Added <br /> 6 O Relative%Dfference Cone of M S -Cone of M S D X100 <br /> n ee (Cone of M S + Cone of MSD)/2 <br /> roject Manager 3A46301 RES <10> <br />