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b. The applicant will need to provide a flooding impact analysis characterizing the Floodpath and Flow velocities for flooding events expected during the life of the operation. The applicant will need [o assess how much of [he pi[ or lakes will be Flooded, how the flood waters will be safely routed back to the main channel of the Cache le Poudre, whether the agricultural drain tiles will be affected, whether the headgate structures for the Jones Ditch and the Greeley #3 Ditch will be affected, and how the riverbank and pitside banks will be protected from excessive erosion. c. The mine plan map shows a proposed setback distance of at least 100 feet from the centerline of the Cache le Poudre River to excavations in Cells 1. 2, and 3. The minimum setback distance [he Division will allow for pit excavations is 100 feet from the pit edge to the top of the nearest river bank during low flow times of the year. A minimum 200 foot buffer zone will need to be maintained between the edge of the pit and top of the nearest bank of the Cache le Poudre River at all times between April lst and October 1st of each yeaz. If the operator mines the zone between 100 feet and 200 feet from pit edge to the top of the nearest bank of the Cache le Poudre River, all mining must be completed and backfilled to original ground surface within one low flow season falling between October 1st and March 31st. If the applicant wishes to commit to these criteria, then the Division will also require the following commitments : A) During each year that the reclamation permit for the Riverview Resources Pit is active, the operator shall provide to the Division of Minerals and Geology a signed affidavit stating that a 200 foot buffer zone is established between the edge of the pit and the top of the river bank. The affidavit shall be submitted by April lst of each yeaz and shall include a statement that the buffer zone will be maintained during the period from April 1st through October 1st, B) If mining occurs within the strip of land that is between 100 feet and 200 feet from the pit edge to the top of the nearest bank, final reclamation will include a stable backfill to the original ground elevation within the mined strip and reclamation of the surface of the fill in accordance with the approved reclamation plan, and C) The operator will provide in Exhibit L, Reclamation Cost, an itemized cost for backfilling to natural ground all azeas mined within 200 feet of the top of the nearest river bank. (As an alternative to the above criteria and commitments in Item 2, the applicant may revise the mine and reclamation plan and maps to provide a mimimum setback distance of 400 feet from the edge of the pidlake to the top of the neazest river bank). 3. Exhibit C, Mine Plan Map shows the location of water tiles between Cells 4 and 5. Also, several objectors have expressed concern over possible impacts from mining to existing drainage tiles. As reported, the tiles are used to drain excess water from existing and surrounding farm land. The applicant will need to verify the location of all existing drainage tiles that occur within the proposed affected land boundary as well as within 200 of the affected land. The operator will need to demonstrate how compliance with Rule 6.4.19 will be achieved for each of the drainage tiles identified.