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lJ Mr. Bradford Janes - 2 - Oct~~ber 15, 1987 Amendment Adequacy Review Sterling Companies Home Office Mine File No. M-77-439 A. In areas where the buffer is less than 100 feet, the remedial use of riprap in these locations be implemented where nece~~sary; and, To control the location of outflow from ponds under flood conditions, spillways be constructed in pond berms to outlet flood waters. If the river were to breach into a lake during a large flood, a spillway would serve to direct the flow safely back into the main channel or to an adjacent pond in series. The spillway could be constructed as a very low, flat and wide gras<_;ed waterway which could blend into the adjacent embankment or incised shoreline. For areas yet to be mined adjacent to the river, especially ponds C, F, I and Areas 3 and 4, the inclusion of a flood spillway should be considered for incorporation into the final design. 4. In the narrative discussion of Exhibit C-7 and in Exhibit G, reference to the impacts and mitigation on surrounding ground water wells is made. The resolution of this issue has been discussed recently and an agreement was reached. In lieu of an extended hydraulic investigation on the effect of pit dewatering on well levels in the proximity, it was determined a statement could be included in the permit that any impacts on water rights or well structure would be mitigated by the operator. Revised pages as appropriate should be submitted for inclusion in the permit document. Soils 5. The additional information on soils made available in Exhibit I and Exhibit C-5, and the addition of the soil testing and records management aspects of the soil salvage program, are commendable and should result in imprroved reclamation of the site. Vegetation 6. The pre~nine inventories identify fourwing saltbush and winterfat in the permit areas of the four mine sites. The inclusion of two native legumes in the seed mixture is noted as an exceptional proposal. AlU~ough the revised seed mixtures proposed are quite appropriate and should produce good cover, has the addition of fortis been considered in the revegetation plan? Reclamation Plan At various locations in the permit a discussion is presented For including irregularities in the pond shorelines. The plan is indeterminate as to whether these will be features created during excavation or by backfilling. The Division acknowledges the option for the operator choose either method for constructing the intern+~1 berms in