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Rule 6.4.4 Exhibit D-Mine Plan <br />Rule 3.1.9(3) requires that topsoil stockpiles be stored in places and configurations to minimize <br />erosion and be located in areas where disturbance by ongoing operations will be minimized. The <br />topsoil piles in Phase II are located in the middle of the active pits. Please explain how the topsoil <br />piles will be protected from the ongoing mining operations. <br />6. Topsoil piles are depicted on Exhibit C-2. Overburden piles were not noted on the map. Please be <br />awaze that topsoil will need to be segregated and stored separately from the overburden material as <br />required by Rule 3.1.9(1). Please locate all current and future overburden piles on the mine plan map. <br />Rule 6.4.5 Exhibit E- Reclamation Plan <br />7. Please state the depth in which clay will be mined in order to construct the compacted clay liner. In <br />addition, please provide an estimated volume of clay to be excavated for each pond so that it may be <br />included in the reclamation cost estimate <br />8. On May 2, 2003, the Division approved TR-Ol to the permit to revise the seed mixture for Phase I <br />area. Attached is a copy of the approve seedmixture for Phase I. Please state if this seed mixture will <br />continue to be used in this azea. <br />9. The operator proposes to leave an existing 30-foot haul road to remain as a component of the <br />reclamation plan. Section 34-32.5-116(4)(a) of the Colorado Land Reclamation Act for the <br />Extraction of Construcfion Material states that grading shall be carried on so to create a final <br />topography appropriate to the final post-extraction land use selected. The Division does not believe <br />that leaving a road 30-feet wide is compatible with the proposed post mining land use. As an <br />alternative to leaving the haul roads in their current configuration, the operator may opt to reduce the <br />width of the haul roads to be more compatible with the end land use. The operator will need to <br />specify the reduced road width, describe the reclamation measures that will be taken to reclaim the <br />excess road areas and describe any drainage features to be constructed or to remain (i.e. drainage <br />ditches and existing or new culverts). <br />Rule 6.4.6 Exhibit F- Reclamation Plan Man <br />10. The reclamation plan map does not show the proposed topography of the area with contour lines of <br />sufficient detail to portray the depth and slope of the reclaimed ponds. Please revise the reclamation <br />plan map to include contour lines of the reclaimed area. <br />Rule 6.4.7 Exhibit G- Water Information <br />11. The revised reclamation plan includes converting the pond into a developed water resource. In <br />confom~ance with Rule 6.4.7(4), please state what surface water rights exist or will be used to divert <br />water into the ponds to achieve the post mining land use of developed water resources. <br />12. A portion of the site is within the 100-year floodplain of the Big Thompson River. In the event of a <br />significant flood event, it is possible that the Big Thompson River will impact the reclaimed clay <br />lined pond. Accordingly, the Division requests that the applicant provide the flood elevations(s) to be <br />expected under a "worst case" flooding scenario and specific mitigation measures that will be <br />implemented to minimize the potential for any offsite impacts. Mitigation measures might include <br />installation of flood control spillways within the reclaimed lake, or armoring reclaimed pit slopes in <br />close proximity to the Big Thompson River with erosion control ripmp. Legible copies of the Flood <br />Insurance Rate Maps ("FIRM") through the mine reach would facilitate the Division's review. Please <br />