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0 9 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Waterwork Client Project ID: #490, Thorpe Weber Ave. <br /> P3.1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channel] QC Sample Group: 1041933-1934 Re Apr 25, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chioro- <br /> 1,1-Dichloroethene ethane benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: E. Hamilton E.Hamilton E. Hamilton <br /> Reporting Units: pg/kg pg/kg pg/kg <br /> Date Analyzed: Apr 18, 1991 Apr 18, 1991 Apr 18, 1991 <br /> QC Sample #: Matrix Matrix Matrix <br /> Sample Conc.: N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 <br /> Conc. Matrix <br /> Spike: 9.9 10 11 <br /> Matrix Spike <br /> % Recovery: 99 100 110 <br /> Conc. Matrix <br /> Spike Dup.: 8.5 10 11 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 85 100 110 <br /> Relative <br /> % Difference: 15 0.0 0.0 <br /> S/EQ DfA ANALYTICA %Recovery: Come.of M.S.-Come.of Sample x 100 <br /> Spike Cone.Added <br /> li a�eo Relative%Difference: Cone.of M.S.-Conc.of M.S.D. x 100 <br /> beth W. Hackl (Cone.of M.S. + Come,of M.S.D.) 2 <br /> IP P Jec <br /> Ject Manager 1041931,WAT <9> <br />