2023-05-25_PERMIT FILE - M2022048 (9)

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ENVIRONMENT, INC. PAGE 3 L.G. EVERIST, INC. -WEST FARM RESERVOIR ADEQUACY RESPONSE 01 MAY 23, 2023 6) Please show the locations and expected volumes of the topsoil and overburden stockpiles on the Mining Plan map. Please note that the rule requires segregation of Topsoil from Overburden and that the topsoil be maintained for use in reclamation. Stockpiles located within the floodplain should be oriented parallel to flood flows. Map Exhibit C-1 - Mining Plan Map has the approximate location of soil berms in all 4 mining Phases. Where applicable, they have been located outside the floodplain and or parallel to the river's flow as you suggested or along the roads in Phases 3 & 4. They are labeled as, "TEMPORARY GROWTH MEDIUM BERMS" or "SOIL BERM". The volume of material in each pile will far exceed the amount needed to resoil the areas around the site. Any excess material will be removed through sales or used to create liners or slopes in the reservoirs. The estimated approximate locations and volumes shown on the map may change as mining progresses. As the operations get into full swing, the plan is to replace soil as it is stripped, back on the areas that are ready for recoiling so it is handled only once. L.G. Everist, Inc. is aware the overburden and topsoil (growth medium) must be segregated. EXHIBIT D - Mining Plan (Rule 6.4.4): 7) Please describe in detail, and show on the mining plan and reclamation plan maps, how irrigation return flow from the adjacent property to the south will be preserved/conveyed to the South Platte River during and after mining of Phase 1. The plan is to relocate the irrigation return flow that enters the permit area from the Abbett Trust Farm, so it flows along the south side of the liner and connects to an existing ditch that parallels the west side of the old railroad embankment, then west along CR 32.5 to the existing culvert that crosses under the road, allowing it to return to the river north of the road. The location was shown on the Reclamation Map but I have enhanced the line so it shows better. This may also be used as the return flow for the ground water elevation drain depending on how the land slopes in the southeast corner of Stage 1. 8) If two different types of reclamation will be utilized to achieve the final interior reservoir slopes of 3H:1 V(backfill from %H:1 V to 3H:1 V vs. cut/fill) you will need to clearly specify on the mining and reclamation plan maps where each of these methods will be used and what the required bench width will be where cubfill is proposed. Please also remove the statement on P22 about mining to final slopes if this is not the proposed plan. LGE has determined they will use the backf ill method for creating the final slopes in the reservoir areas, The material to be used for this will be a combination of overburden and