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.- <br />DGMC, PO BOX 96, H~ERUS, CO 81326 • page 2 <br />baseline hydrology data, and has not provided an adequate hydrologic monitoring <br />program sufficient to meet the requirements for a designated mining operation. <br />The above comments have been adequately responded to in the response dated <br />February 25, 1995 to comments by Dr. Harry Posey. All of the above questions <br />were responded to according to conditions of the Division. <br />%%XXXX%XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX%XXXXXX%XXXXX%XXXXX%XXXXXX%XXXXXXXXXXXXXXXXXXx%xXXXXXXXXXXXXX <br />1. The method proposed for disposal of spent ore discusses the use of diversion <br />ditches to manage surface water flows. However, the operator has not provided <br />engineering designs for the ditches or construction techniques to be implemented. <br />Also, the operator discusses the installation of a 5' thick compacted cover. The <br />operator has not characterized the material to be used or provided a permeability <br />to be expected upon compaction. Finally, a vegetative cover on top of the clay <br />cap may be helpful. However, the operator may consider placing 6-8 inches of <br />suitable growth medium (soil) on top of the compacted cap in order to achieve a <br />desirable result. <br />The engineering design for the diversion ditches and roads has been included in <br />the response dated March 7, 1995 to comments by Tom Gillis of the Division. <br />The permeability and thickness of the compacted cover on the spent tailings was <br />agreed to in response dated February 25, 1995 to comments by Dr. Harry Posey. <br />The surface of the compacted cover on the spent tailings will have soil added, <br />mulched, and seeded with appropriate vegetative cover. <br />XXXXXXXXXXXXXXXXXXXXXXX%XXXXXXXXXXXXXX%XXXXX%%XXXX%%XXX%XXXXX%XXXXXXXXXX%XXXXX%%XXXX%XXXX%XXXXXXXXXXXXXXXXXX <br />2. The operator appears to have resolved concerns for adequate water rights with <br />the State Engineers Office. <br />A copy of the information to the State Engineer's Office and their response can be <br />included in the Incas Mine file if the Division desires. <br />%%%XXX%%%%X%%%%XX%X%XXXXX%XXXXXXXXXXXXXXXXXXXXXX%%%%%X%%XXX%XXX%%X%%%%%X%%%XXX%%%XX%%XX%X%XX%%%%%%%X% Y <br />3. The operator proposes fill of filter cake/mine waste into open cuts and shallow <br />depressions while at a moisture content of 25%. The operator further states that <br />the operation will be designed and constructed as a zero discharge facility. <br />Therefore, until the operator has secured an NPDES water discharge permit from <br />the Colorado Department of Health, Water Quality Control Division DGMC/Bob Hill <br />will need to demonstrate that any residual moisture in the filter cake/mine waste <br />placed as fill will be contained on site and will not discharge toward Little <br />Deadwood Gulch. <br />dmg-19 \ dgmc 2 3/7/95 <br />