2023-01-04_PERMIT FILE - M2022013 (2)

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Wetland conditions appear confined NNlthin portions of the stream terrace and bank-full stage of the rivers, and along segments internal to the Evans Canal. Extraction Nvill form a depression (basin) Nvithin the floodplain as shoivn in Exhibit C-2: Extraction Plan Map. Temporary above ground fill may occur ivithin the floodplain, and as part of this permitted actixity, provided the above ground volume does not exceed the below ground volume created by extraction. All product stockpiles and processing skill occur N,Ithin the cite limits of Evans under this application, and North and outside of the floodplain boundarl- of the 100-year floodplain of the Big Thompson River. The floodplain extent vNill be visually marked in the field to better assure the integrity of the floodplain. Material transport of raxv materials from extraction locations to the plant site will occur via conveyor (see route on Exhibit C-2: Extraction Plan Map). This will in turn serve to minimize impacts to area transportation corridors. The actual location, extent, and nature of the conveyor systems not otherwise designated in this submittal will be provided as updates in the required 4MLR Annual Reports. As described in this response concerning items 23 and 24, additional detail on the floodplain management and the conveyor was stated as follows' From Item 23 Response We can affirm here that stockpiling above the existing ground elevation will not occur in a manner understood to obstruct flood waters where they might occur within the existing floodplain. It is understood and agreed here-in that their longitudinal dimensions if they occur there should extend parallel to anticipated flood flows where they exceed a cone or other shape that might find its existence contrary to intent by volume beyond that which could be understood to be temporary, or transitory; especially outside of seasonality where flooding might be more reasonably anticipated. From Item 24 Response The conveyor will be set on an elevated structure at varying heights to be situated about the 1 in 100-year flood level. An average height of 7 feet is expected. The conveyor will be supported by legs at intervals of approximately 20 feet with concrete blocks used as necessary to anchor the legs. Final conveyor specifications are to be determined but a 24-36" belt is anticipated. A wider span than typical will cross the Big Thomson River at an elevation above 48 � Pabe Correspondence to the Colorado Office of Mined Land Reclamation—Reply to Rob Zuber,EPS—Adequacy Letters of 24 June and 5 August 2022;in the matter of the Two Rivers Sand,Gravel and Reservoir Project—M2022-013.