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SEQUOIA ANALYTICAL <br /> 680 Chesapeake r <br /> p e D rve • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Evax Technologies, Inc Client Project ID B239-02/Tracy-Ed's Muffler <br /> 269 Mount Herman Road, Suite 101 <br /> Scotts Valley, CA 95066 <br /> Attention Paul Studemeister QC Sample Group 2033856-7 Reported Mar 30, 1992 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> l Lead <br /> Method ErJA 239 2 <br /> Analyst S Chin <br /> Reporting Units mg/L <br /> Date Analyzed Mar 27, 1992 <br /> I QC Sample # 203-4448 <br /> Sample Conc N D <br /> Spike Conic <br /> Added 1 0 <br /> Conc Matrix <br /> Spike 084 <br /> t <br /> Matrix Spike <br /> % Recovery 84 <br /> Conc Matrix <br /> Spike Dup 084 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 84 <br /> i Relative <br /> % Difference 00 <br /> VN4oe*llaM/a <br /> NALYTICAL %Recotery 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 /> ovich (Conc of MS + Conc of M S D)/2 <br /> Project Manager 2033856 EEE �2 <br />