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Mr. Lloyd V. Barnhart - 4 - April 8, 1986 c. If the diversion is not to remain in final reclamation or will not be adequate to handle maximum flood conditions from the arroyo, lease describe how the lake is to function as a flood-control structure (e.g., inflow structure, outflow structure such as a spiliway, capacity of the Take to handle flood inflows, etc.). This could, if the arroyo inflow is minimal, be a more practical reclamation plan than a permanent diversion around the lake. d. In general, the hydrologic implications of this diversion, both ~,. during mining and in final reclamation, need to be discussed in detail, preferably by a qualified hydrologist before this diversion Sj plan is approved. X e. All diversion structures should be included as a part of the permit area. 3. It appears that another drainage runs along the western boundary of the X permit area but is not shown on the maps (it is shown on map Exhibit B). Please discuss this drainage area, in terms of mining and reclamation. Exhibit J - Vegetation Information 1. Although you reference the S.C.S. re vegetation plan in Exhibit E, the S.C.S. plan is somewhat more detailed. I presume that you intend to abide by the details of their recommended re vegetation plan. Please clarify the intentions in this regard. Exhibit L - Reclamation Costs 1. I agree that your cost estimates are lower than the cost estimates typically used by our Division. For example, your topsoil replacement costs alone (not including minor grading for site preparation) are low by at least 100%. Your grading and backsloping costs for major disturbance are difficult to judge because we try to calculate such matters on a cubic-yard-moved basis, and you have not used this methodology. However, major grading (perhaps including extensive backfilling of stockpiled overburden, in this case) could certainly not be done for 5400.00/acre as you suggest. I realize that some lake surface will remain in a worst case situation, but your costs do not specify this. I suggest that you consider specifically what areas will require what extent of reclamation in a worst-case situation and then use more realistic reclamation cost calculations to get a total cost for the entire area to be reclaimed. This should consider the fact that about 12 acres are already disturbed. 2. Please note that the most severe disturbance category must also include each of the less severe disturbance categories within its costs. You have not done your calculations in this manner. For example, all areas of major disturbance requiring grading, backsloping and perhaps backfilling will also require top soiling and re vegetation activities. The costs for the various categories of disturbance need to be done in that manner, adding in all the lower categories of disturbance. This will, of course, also increase the per acre cost of all except the minor disturbance category.