2011-03-14_REVISION - M1977493 (49)

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CM0001468 Climax Mine - Robinson Lake Pump Station Replacement • Eagle County 1041 Application Submittal system of intercepting clean water flows outside the currently affected lands and re-using and recycling stormwater within the system helps preserve adequate flows for stream and river environments. Floodplains, Wetlands and Riparian Areas The pump station and pipeline will be located within the affected land boundaries of the Climax site, where there are no water features classified as waters of the United States that would be regulated under provisions of Section 404 of the Clean Water Act. Regardless of this classification, there are no identified wetlands or riparian areas near the building site or along the pipeline alignment, along an existing road. The pipeline will be buried beneath the emergency spillway of Robinson Lake, but no other natural floodplains will be impacted. Terrestrial and Aquatic Animals and Plant Life The Robinson Lake Pump Station will be located adjacent to existing facilities within more sparsely vegetated areas previously disturbed by mining operations and industrial activity. In addition the alignment of the pipeline has been designed so that no new disturbances of land will occur. As stated previously, the Project area does not exhibit desirable habitat characteristics for identified threatened or endangered animal or plant species. • L_J Areas disturbed by construction, unless within a roadway, will be stabilized and revegetated following established stabilization and reclamation procedures. Soils, Geologic Conditions and Natural Hazards A geotechnical investigation was performed at the building site to determine appropriate design criteria for the pump station structure. There are no known soils or geologic conditions which would expose the Project to unacceptable risk. The existing Robinson Lake Pump Station building has been unaffected by natural hazards since its construction in 1936 and the replacement project will not change conditions or be conducted across or near any avalanche areas, debris fans, unstable slopes, or other known natural hazard areas. The stability and integrity of the Robinson Lake dam has been evaluated and certain improvements to the dam and its outlet works are being coordinated with the State Engineer's Office to allow for an increased operating water level. A review of Eagle County Wildfire Hazard Rating information indicates that the Project area is within an area with a very low hazard rating. 7. HAZARDOUS MATERIALS DESCRIPTION Diesel fuel for use by the backup emergency generator (to provide backup power for pump station heating and lighting) will be stored within, or adjacent to, the building in an approved storage vessel with appropriate secondary containment features. Such storage will be managed in accordance with the site- 14