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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> NO (415) 364-9600 • FAX (415) 364-9233 <br /> .... ....Client C1 lent Project ID: #490,Thorpe Weber Ave"."' <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> '..'..Attention: Bill Channell OC Sample Group: 1041933-1934 Reported: Apr 25, 1991 <br /> ............ <br /> X <br /> . ............. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE_ Lead <br /> Method: EPA 7421 <br /> Analyst: N. Herrera <br /> Reporting Units: mg/kg <br /> Date Analyzed: Apr 17, 1991 <br /> QC Sample #: 104-0380 <br /> Sample Conc.: 0.023 <br /> Spike Conc. <br /> Added: 0.20 <br /> Conc. Matrix <br /> Spike: 0.19 <br /> Matrix Spike <br /> % Recovery: 84 <br /> Conc. Matrix <br /> Spike Dup.: 0.20 <br /> Matrix Spike <br /> Duplicate <br /> •Recovery: 89 <br /> Relative <br /> • Difference: 5.1 <br /> S10 01A ANALYTIC f f%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 /> 6. abeth Hackl (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> ( P oject Manager 1041931.WAT <7> <br />