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r• i I <br /> j <br /> SEQUO - ~�IA NALYT'ICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364-9600 + FAX(415) 364-9233 I <br /> I <br /> wo ROW <br /> l <br /> n<Waterwork <br /> ClFent Project rD: 385 Eckholm �:v <br />{{ 1710 Main Street <br />[[ Escalon, CA 95320 - <br /> -� QC <br /> Attention: Lols Frarrtz "`Sample Group: 81043735-3740 ".vj,�~r~�:�: ����z�"°' Reported• May 17i99i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method: EPA 7421 <br /> Analyst: V.Patel <br /> Reporting Units: mg/kg 3 <br /> Date Analyzed: May 1s, 1991 <br /> OC Sample#: 105-1396 <br /> Sample Conc: 5.0 <br /> Spike Conc. <br /> Added: . 50 <br /> Conc. Matrix <br /> Spike: 50 <br /> i° <br /> Matrix Spike <br /> % Recovery: 90 <br /> Conc. Matrix <br /> Spike Dup.: 52 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 94 ' <br /> Relative <br /> % Difference: 3.9 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> ? Spike Conc.Added <br /> Relative%Uffe.rence: Conc,of M.S.-Conc.of M.S.D. x 100 <br /> E za ejha iConc.of M.S. + Conc.of M.S.D.)/2 <br /> rojectnager R1o43735.wAT <2> <br />