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STATE OF COLORADO <br />Bill Ritter, Jr., Govemor <br />Martha E. Rudolph, Executive Director <br />Dedicated to protecting and improving the health and environment of the people of Colorado <br />4300 Cherry Creek Dr. S. <br />Denver, Colorado 80246-1530 <br />Phone (303) 692.2000 <br />TDD Line (303) 691-7700 <br />Located in Glendale, Colorado <br />httW1/www.od0e.sta1e.co.us <br />Octtober 20, 2010 <br />Laboratory Services Division <br />8100 Lowry Blvd. <br />Denver, Colorado 80230-6928 <br />(303) &92-3090 <br />John S. Hamrick, VP Milling <br />Cotter Corporation <br />P.O. Box 1750 <br />Canon City, CO 81215 <br />RE: Notice of Violation/Cease and Desist Order, Number: I0-100601-1 <br />Cotter's Temporary Trench Dewatering Activities <br />Dear Mr. Hamrick: <br />w <br />a f <br />Colorado Depairtment <br />of P6fi <br />and Emi imnment <br />The Colorado Department of Public Health and Environment's Water Quality Control Division (the <br />"Division's has reviewed Cotter Corporation's plans for the installation of two additional alluvial <br />sumps at the SchwmUwalder Mine, including the winterization of the new and current treatment <br />delivery and return system. The additional sump locations are part of an expansion of the alluvial <br />treatment system required by paragraph 28.a. of the Notice of Violation/Cease and Desist Order, <br />Number: 10-100601-1 (the `'NOV/CDO"), that the Division issued to Cotter on June 1, 2010. <br />The Division hereby grants Cotter temporary authorization to dewater the trenches- and excavations <br />associated with the installation and winterization of the alluvial pump and treat system, and land <br />apply the water to the retention pond excavation area located in the northwest portion of the site. <br />Cotter's temporary dewatering activities should be conducted in a manner that ensures the activities <br />do not result in a surface water discharge. The authorization to conduct the dewatering activities <br />will expire on November 22, 2010, or upon written notification from the Division. <br />If you have any questions or concerns, please feel free to contact me at (303) 692-3598 or by <br />electronic snail at miehaelJ=-ris@state.co.us. <br />Sincerely, <br /> <br />Michael Harris <br />Enforcement Unit <br />WATER QUALITY CONTROL DIVISION <br />ec: Tony Waldron, DAMS