2024-06-07_PERMIT FILE - M2024026 (23)

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Exhibit D Page 2 (c) All water diversions and impoundments; As described in Exhibit G: Water Information,regional drainage is generally to the south-southeast across the Permit Area. Surface topography at the site is gently sloping(southeasterly)at a rate of 40 to 50 ft per mile,with elevations ranging from approximately 4,770 ft amsl near the Permit Area's northwest corner,to about 4,630 amsl near the southeast corner of the Permit Area. Minimal run-on and/or rim-off is anticipated at the location due to the generally undulating topography and overall low slope gradients across the Permit Area, in conjunction with the highly permeable soils which comprise the underlying material. Notably,the proposed permit area, virtually in its entirety, is comprised of surficially deposited eolian sands,thus, there is rapid and high infiltration,with limited runoff potential. In general,Colorado Sand Company II,LLC(CSC) has designed the Kersey Mine Project to take advantage of this site-specific characteristic;and,due to the nature of the surrounding area(i.e.,the limited area of influence associated with the Permit Area location),no significant run- on or run-off potential is anticipated.CSC will,however,establish"diversion" features in the form of safety berms along pit perimeters which will serve a dual function of minimizing the potential for localized drainage to enter the active pit areas. While the post-mining pit depression(s)will,over the long term, ensure that there will be no offsite excursions sourced from the mined area(s),natural drainage patterns,outside of mining pit areas,will be generally restored at time of closure and site reclamation,as further detailed in Exhibit E: Reclamation Plan. The plant facilities are to be situated in a high-elevational area(nominal elevation of approximately 4,700 ft amsl)in the extreme northeast portion of the Permit Area. All drainage run-off from this area will be directed toward the holding cells and the natural land surface where drainage will be dispersed through natural infiltration into the underlying sand and/or silt materials. It is anticipated that the effects of evapotranspiration will further reduce drainage concerns.Thus,there will be neither drainage-related impoundments nor active"impounding"of drainage flow. Drainage considerations within the confines of the defined mineable blocks(areas)within the overall Permit Area are generally limited to footprint precipitation accumulations, again subject to rapid and high infiltration,given the characteristics of the eolian sand deposit where mining operations will occur. Accordingly,the Kersey Project will function as a"zero-discharge" facility.All operational areas will be incorporated into the facility's Storm Water Management Plan, as a component of the required Colorado Discharge Permit System Storm Water General Permit. (d) The size of area(s)to be worked at any one time; The typical annual mine block is anticipated to range from approximately 70 to 135 acres in areal extent;however, the actual active mining(face)area will typically encompass only a fraction of the annual area. Generally,the active face area will be on the order of 20 to 30 acres in areal extent, sufficient to allow routine operational flexibility in excavating, loading,and hauling activities,while minimizing overall actual disturbance. At any given time,the maximum area of disturbance will include: the active face area(up to the full extent of a typical annual mining block)and the(recent)previously mined out blocks,consisting of(up to)five yearly mine blocks. Typically,the closest trailing mine block will be receiving growth medium,and the remaining four will be substantially reclaimed and in various stages of revegetation monitoring and maintenance. In addition to these mining area(s),the process plant area and ancillary facilities will remain as"disturbed area" until such time final site closure and reclamation are undertaken and completed. Colorado Sand Company II, LLC Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application June 7,2024