2012-05-25_REVISION - M1977493 - Laserfiche WebLink

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to Highway 91. After mining and milling operations cease, the East Side Channel would be modified to convey clean stormwater run -off from reclaimed areas on both sides of Highway 91. The East Side Pipeline (ESP) would be constructed to convey impacted water from the Camp area and OSFs to the Mayflower Pond and PDWTP for treatment. In AM -06 the converted East Side Channel and new ESP are shown to begin at the south side of the North 40 OSF, near the TDH structure below the Camp area (Figure AM- 06- G -04). Climax has reevaluated the need for the converted East Side Channel and ESP upgradient of Robinson Pond and McNulty Gulch in light of proposed changes to the OSF diversion system to be submitted to DRMS as TR -22. The stormwater runoff diversions that are being proposed for the North 40 and McNulty OSFs will terminate at the base of McNulty Gulch such that stormwater can be directed to either the East Interceptor or to the newly constructed Tenmile extension of the East Side Channel. As needed, clean stormwater from portions of the reclaimed Camp area will then be diverted to the North 40 OSF stormwater conveyance. With this design concept there is no longer a need for the converted East Side Channel to extend up to the Camp area. Instead, the converted East Side Channel would begin at the spillway from the reclaimed Robinson Pond (Figure AM- 06 -G -06) and extend to the Tenmile Creek drainage. With the revised OSF water management design, the ESP segment that was envisioned to begin at the TDH also is no longer needed since impacted water from the Camp area and North 40 OSF can be conveyed for treatment using the ETDL, TDL or the existing segment of the East Side Channel that extends up to the Camp area. The ESP would now begin near the Robinson Pond spillway, at or below the starting location of the converted East Side Channel, and would collect impacted water from the existing East Side Channel upgradient of this location. Conversion of the East Side Channel and construction of the ESP from the TDH to below the Robinson Pond spillway is no longer required for site closure. This represents approximately $3,500,000 that can be eliminated from the site reclamation performance bond, or used for financial assurance to cover other reclamation costs not identified in AM -06, Exhibit L. Climax also is evaluating other post - closure, water management design changes such as the conversion and utilization of the TDL to replace the ESP along the east side of Tenmile and Mayflower TSFs. These types of changes will provide additional reclamation cost reductions and additional buffer in the Climax financial warranty. Climax appreciates the Division's consideration of these responses. Please feel free to contact me should you have any remaining questions or comments. Sincerely, Raymond Lazuk Environmental Manager attachments 3