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L <br />' "Inter-Mountain Laboratories, Inc. <br /> <br />Client: Colowyo Coal Company L. P. <br />Project: Colowyo Mine <br />Sample ID: 007 <br />Lab ID: 0198W02860 <br />Matrix: Water <br />Condition: Coal/Intact <br />Quality Control Report <br />Duplicate Analysis <br />7679 Terra Avenue <br />Sheridan, WY 82801 <br />Report Date: 07/01/98 <br />Receipt Date: 06/19/98 <br />Sample Date: 06/18/98 <br />Time Sampled: 0830 <br />Original Duplicate Relative <br />Parameter Conc. Conc. % Diff. POL Units <br />Lab pH 8.5 8.5 0 0.1 s. u. <br />Lab Conductivity @ 25'C 1,a10 1,a70 0 t umhbs/un <br />Total Setteable Solids <0.5 c0.5 NC' 0.5 mIJL <br />Total Dissolved Solids @ 180'C 960 970 1 10 mg/L <br />Total Suspended Solids a88 500 2 5 mg/L <br />Iron 14.2 14.2 0 0.05 mg/L <br />'NC -Non-Calculable RPD due to value(s) less than OL <br />Reference: U.S.E. P.A 600!4-79-020, "Methods for Chemical Analysis of Water and Wastes", 1983. <br />U.S. E. P.A 600/4-79-020, "Metho`d`s for Chemical Analysis of Water and Wastes". 199x. <br />Reviewed By: ~r.j \v <br />Wade NiPUw<ma Water Lab Suoerv~sor <br />