PERMFILE42182 - Laserfiche WebLink

Home Browse Search

' A concrete irrigation ditch exists along the western side of a din access road connecting to the west ,~ end of Railroad Avenue. Both the ditch and road extend into a Wildlife Refuge. This Wildlife Refuge is located between the south side of the proposed Railhead Pit and the C¢olorado River. A 44 foot wide paved drainage easement extends from Railroad Avenue south below a`failroad spur by way of a small ' ( concrete bridge. Pavement markings indicate that a water line is buried beneath this paved easement. The railroad tracks, in a 20 foot wide easement, are situated on a 5 to 7 foot embankment which ~ appears to consist of rounded cobbles and sand. These tracks span northwest and southwest for ' almost the entire length of the tract. They run parallel to Railroad Avenue. A line extends off this spur and curves northeast across Railroad Avenue, to the main track. The main track exists north of River Road with both the spur and the main track paralleling the north side of Railhead Industrial Park. ~, 10 Near the center of the proposed pit is a USGS corner section benchmark. This benchmark will need to -- be relocated with information submitted to proper authorities. A public open space easement exists along the southern side of the proposed pit. This access easement will need to be maintained ' throughout the pit's operation and sufficiently protected at closure. The Wildlife Refuge south of the south property line is lined with barbed wire fence, and has aconcrete-lined irrigation ditch running along the fence line. Pursuant to CRS 34-32-115(41, mining operations must remain 200 feet or more from any significant, I, I valuable, or permanent man-made structures unless it can be demonstrated that such operations will not adversely affect the stability of these structures. On this tract of property, consideration must therefore be taken for utilities, the concrete irrigation ditch, and the interstate embankment. Any ~ railroad tracks or intermediary roadways we assume will be removed during excavation. '~ EARTHQUAKE AND SEISMICITY DATA ' Most of Western Colorado lies in a seismic zone 1 classification, signifying low seismic risk where earthquakes classified as Vl or less in intensity may occur. The active Redlands Fault is actually a '' combination of three separate faults. The age of its movement is Quaternary. Farther to the south, a series of faults with recent seismic activity follow the Uncompahgre Uplift. However, no damage has resulted from earthquakes in the Grand Valley. A recent earthquake of highest magnitude happened in in 1975 with a magnitude of 4.4. ' 4