1990-01-22_REVISION - M1988112 (3)

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BATTLE MOUNTAIN RESOURCES, INC. ADEQUACY RESPONSES - ADDITIONAL INFORMATION PAGE 6 OF 7 The Division's concern was that the V-shaped channels would promote erosion. Given the low velocities and the intent that the channel would be overtopped in a large storm event, erosion is not expected to occur in the channels. The channels will be monitored for sediment build-up and erosion until reclamation release. If either of these conditions occurs, the channel design will be re-evaluated and BMR will implement appropriate correction actions as approved by the Division. 43. Responses to a, b and c are satisfactory. The information wanted in comment d was the velocity for the PMP event in the grassed area and not the velocity for the 100 year 24 hour event. Please provide. Figure F-3 should be revised to show the energy dissipation structure at the base of the spillway. In addition, the low flow spillway should be constructed in the center of the spillway rather than off to one side. The peak discharge onto the tailings disposal area is estimated at 9,220 cfs during the PMP event. Routing of the flow through the tailings disposal area and reclamation spillway will reduce the peak discharge to 6,220 cfs in the spillway. A discharge velocity of 8.1 feet per second is expected in the revegetated section of the channel during the PMP event. Attachment 3 presents the velocity calculations. 44. The comment was satisfactorily addressed in the January 9, 1990 submittal. 45. The comment was satisfactorily addressed in the January 9, 1990 submittal. 46. The comment was satisfactorily addressed in the January 9, 1990 submittal. 47. The comment was satisfactorily addressed in the January 9, 1990 submittal. 48. Rev ised Exhibit L has not yet been provided. Based on agreement of the reclamation plan for the tailings disposal area, Exhibit L, Reclamation Costs, will be presented for review. 49. Revised Exhibit L has not yet been provided. Based on agreement of the reclamation plan for the tailings disposal area, Exhibit L, Reclamation Costs, will be presented for review. 50. Revised Exhibit L has not yet been provided. Based on agreement of the reclamation plan for the tailings disposal area, Exhibit L, Reclamation Casts, will be presented for review. 51. Revised Exhibit L has not yet been provided. Based on agreement of the reclamation plan for the tailings disposal area, Exhibit L, Reclamation Costs, will be presented for review.