GENERAL53383 - Laserfiche WebLink

Home Browse Search

Mr. W. D. Lamoreux - 3 - December 15, 1989 would request that you submit a series of 4 to 6 cross sections through the portal bench depicting the existing condition and the proposed final slope configuration. The design drawings should be accompanied by a narrative description of the reclamation objectives and methodologies. Cross sections should clearly depict current highwall crest elevations, as well as final topography. We would require that the maximum highwall height reduction possible be achieved, given the material available within the mine bench and the constraint of a final reclaimed slope gradient average of between 40% and 50%, with no slope segment steeper than 60%. As stated in our September 21 letter, some grading will be required in the steep sided drainage segment between the lower bench and the portal bench to achieve a uniform gradient, with abrupt slope transitions and pads associated with the conveyor supports eliminated. Portal bench compaction was not addressed in your September 21 letter. An acceptable approach was discussed in our letter of October 12. Depending on the final portal backfill plan which we agree to, alternative compaction specifications may be appropriate. A compaction plan should be included with the backfill plan. Task 8 The proposal in the December 1 letter is acceptable. It will be the surety's responsibility to insure that the owner of the trailer is provided sufficient notification, and that the trailer is in fact removed prior to initiation of reclamation. Task 9 and 11 The backfilling plan is acceptable. The method which will be used to achieve sufficient compaction should be specified. Task 13 The proposal in the December 1 letter is acceptable. Task 14 In addition to the previously noted well, two alluvial monitoring wells will also need to be sealed in accordance with Rule 4.07.3(2). One well is adjacent to the sediment pond spillway outlet and the other is adjacent to the leach pad south of the county road. Task 15 The proposal in the December 1 letter is acceptable. Task 16 In conjunction with reclamation of the leach pad areas as described, the septic tank excavation adjacent to the truck scales north of the county road will need to be filled in.