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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> >: <br /> Waterwork <br /> giant Project ID: X20198-1,Stockton/Banner Island <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Dave Welch OC Sample Group; Reported: Nov 29, 1989 <br /> k;�. .. .:::. . ., :; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Anbmony Beryllium Cadmium Chromium COpper Nickiiii Silver <br /> Method: EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst: D. Herrera D. Herrera D. Herrera D. Herrera D. Herrera D. Herrera D. Herrera <br /> Reporting Units: mg/L mg/L mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed: Nov 22. 1989 Nov 22. 1989 Nov 22. 19W Nov 22. 1W9 Nov 22. 1989 Nov 22, 19W Nov 22. 1W9 <br /> OC Sample#: 911-2122 911-2122 911-2122 911-2122 911-2122 911-2122 911-2122 <br /> Sample Conc: 0.173 0.020 0.049 0.23 0.529 0.387 N.D. <br /> Spike Conc. <br /> - Added: 1.0 1.0 10 10 10 10 10 <br /> Conc. Matrix <br /> Spike: 1.45 1.04 10.14 11.15 10.97 10.52 8.85 <br /> Matra Spike <br /> % Recovery: 127 101 101 109 104 101 88.5 <br /> Conc. Matrix <br /> Spike Dup.: 1.07 0.93 9.69 10.69 10.74 9.68 7.09 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 90.1 91.4 96.5 104 102 92.8 70.9 <br /> Relative <br /> %Difference: 29 10 4.5 4.2 21 8.4 22 <br /> SEQUOIA ANALYTIC AL %A.00very: Conc.a M.S..Conc.of Sample x 100 <br /> Spoke Conc.Added <br /> Relative%Difference: Cone.01 M.S.-Cone.of M.S.D. x 100 <br /> A. orkman (Conc.of M.-& - Conc.of M.S.0.1/2 <br /> 1 r eCt Manager 9110695A.WAT <7> <br />