Laserfiche WebLink
1600 West 12th Ave <br /> DENVER WATER Denver,CO 80204-3412 <br /> 303 628 6000 <br /> denverwater.org <br /> Sent Via U.S. Mail & Email <br /> June 7, 2016 <br /> Mr. Michael Cunningham RECEIVED <br /> Division of Reclamation, Mining & Safety <br /> 1313 Sherman Street, Room 215 JUN 0 7 2016 <br /> Denver, Colorado 80203 <br /> DIVISION OF RECLAMATION <br /> Re: Schwartzwalder Mine, Permit No. M-1977-300 MINING AND SAFETY <br /> Cotter Proposed Technical Revision 23 <br /> Dear Mr. Cunningham, <br /> I am sending this letter to you on behalf of Denver Water regarding Cotter <br /> Corporation's request for Technical Revision 23 related to the Schwartzwalder Mine, <br /> Permit No. M-1977-300. <br /> Enclosed with this letter, please find a copy of a memorandum prepared by Arcadis <br /> on behalf of Denver Water. Arcadis's memorandum summarizes its review of Cotter's <br /> proposed Technical Revision 23. <br /> As addressed in further detail in the memorandum, the removal of the residual <br /> waste rock along the alluvial floodplain may result in some level of water-quality <br /> improvement in Ralston Creek. However, before being approved the proposed technical <br /> revision should address eventual cover material and vegetation for the waste rock piles, <br /> storm water run on and runoff controls, and the material to be used to backfill the <br /> excavated areas along Ralston Creek. The removal of this material also does not address <br /> the mine pool, which will continue to contribute to uranium concentrations in Ralston <br /> Creek. <br /> If you have any questions regarding this letter or Arcadis's memorandum, please do <br /> not hesitate to contact me at 303-628-6342 or by email at Tom.Mountfort@denverwater.org. <br /> Sincerely, <br /> Tom Moun`tf'ort <br /> Manager of Environmental Compliance <br /> Cc: Ken Mushinski, Tony Waldron <br /> Enclosures: (1) <br /> Page 1 of 1 <br />