2008-04-25_PERMIT FILE - M2008010

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Structure Description/notes Owner B, C, and D Stock A series of three stock dams located along a drainage upstream of most of Neva, Catherine Dams the permit area. Dam impoundment areas are 1.1, 0.5, and 0.8 acres 38861 US 160 respectively, with dam crest height of approximately 8 feet, and maximum depth estimated at 7 feet. Located within 200 feet of affected area. Evaluation Based on depths and size, all are non-jurisdictional dams with less than 10 foot crest height, less than 10 acres of surface, and less than 100 ac-ft capacity; coordination with Matt Gavin, Dam Safety Inspector for Water District 7, Durango indicates that there is no record of the dams. Dam failure would create minor flooding and potentially some erosion and sedimentation downstream but will not threaten any structures for at least'/< miles downstream on Mud Creek. Total water released would be roughly equal to 25-year, 24-hour storm event on the tributary of Mud Creek into which this drainage flows. All dams have significant seepage, feeding the wetland areas located downstream on the permit area. See detailed discussion in Attachment 1 to Exhibit S. Conclusion and This structure will not be damaged by proposed operations. Proposed operations both upstream and recommendations downstream are not expected to have any impact on functionality or stability of the dams. Structure Description/notes Owner E. Unimproved Immediately adjacent to the east permit boundary, and within 200 feet of Neva, Catherine roads/trails and affected area, are a series of unimproved roads and trails used by the 38861 US 160 irrigation ditches property owner to go to and from the cropland and the stock dams, and (laterals). several lateral irrigation ditches. Roads are 8-10 feet in width, have some gravel but are mostly dirt, and have no drainage structures or ditches. Irrigation ditches are not more than 18 inches deep and 36 inches wide, unlined. There are no fences on this property line. Evaluation Based on proposed mining and planned slopes, proposed operations in the mining permit area are not expected to have any impact on these structures, which are proposed to remain in use. Landowner and operator may agree to construct a permanent fence along this permit boundary, but no impact on that fence, if constructed, is likely. Conclusion and These structures will not be damaged by proposed operations. Property line shall be clearly delineated recommendations prior to beginning mining operations, Structure Description/notes Owner F. Bohio A bohio (a open-sided structure with a peaked roof) is located in one of the Landowner pastures inside the permit area. It is located more than 200 feet but less than 500 feet from the affected land. There are internal and external pasture fences located in its vicinity. Evaluation During mining operations, fences may be removed or relocated as part of normal farming activities only indirectly related to mining. Landowner does not consider these to be permanent structures. Conclusion and The bohio and nearby fencing will not be damaged by proposed operations, based on location and recommendations nature of construction. Structure Descriptionlnotes Owner G. Homestead The Neva homestead, which was the farm headquarters for both the permit Neva, Catherine area and the adjacent property to the east prior to dividing the property, is 38861 US 160 located 500 feet or more from the affected land. There are fences, outbuildings, and landscaped areas located within 500 feet but more than 200 feet from affected land. Evaluation The terrain and the distance from affected land protect these permanent structures from any significant physical impact. The south buffer zone was laid out in part to ensure that there was no impact on this property. All operations are downslope. Conclusion and The bohio and nearby fencing will not be damaged by proposed operations, based on location and recommendations nature of construction.