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Response: <br /> An appropriate gradation and thickness of blasted riprap, properly placed <br /> on a 1.5H:1 V slope, should be stable with little potential for rockfall <br /> hazard and should not require catchment berms. <br /> 3. Based on the reclamation plan (Exhibit F), no ponds will be included <br /> in the final reclamation. <br /> Response: <br /> Correct. The intent of the reclamation plan is to remove the existing <br /> pond to address water rights issues. Pending future discussions and <br /> planning with Boulder County, a pond may be desired as part of future <br /> reclamation of Area 2 and would be addressed in a future technical <br /> revision. <br /> 4. The grading plan (HDR Attachment B) identifies a drainage ditch with <br /> berm around the upslope perimeter of the quarry and a sediment control <br /> and scour berm. No rockfall catchment berms are identified on the <br /> grading plan or reclamation plan. <br /> o The rockfall catchment berms should be shown on the grading <br /> plan and cross section and reclamation plan. <br /> o Areas where reinforcement will be required (see item 8 <br /> below) should be shown on the grading plan and reclamation <br /> plan. <br /> o Additionally the grading plan should indicate where fill sections will <br /> be located and where native rock slopes will remain. <br /> Response: <br /> The reclamation plan calls for the cut slopes in the sedimentary rock to <br /> be protected by a stable 2-foot layer of riprap to address the rockfall <br /> hazard potential and rockfall catchment berms should not be required. <br /> The geotechnical report alternately allows for soil fills to be constructed M■ <br /> against the dacite on the northeast facing slopes, effectively eliminating on <br /> the potential for wedges to slide out of the slopes. The reclamation plan <br /> shows the highwall areas backfilled and buttressed with stable fill slopes <br /> and reinforcement should not be required. The Site Grading Plan is <br /> revised to include call outs and solid slope symbols to indicate where fill <br /> areas will be located and open slope symbols to indicate where cut <br /> slopes in native sedimentary rock will remain. <br /> ION <br /> 00 <br /> hdrinc.com 6 <br /> 1670 Broadway, Suite 3400,Denver,CO 80202-4824 <br /> (303)764-1520 <br />