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2. @ where ditch turns SW away from access road 3A: <br />`ditch top width = 13'; ditch bottom width = 5.5'; ditch depth = 18"; <br />distance from ditch crest to berm crest = 43"; distance from berm crest to <br />road = 40'; riprapped <br />NOTE: Measuring the ditch and berm at this location was very difficult <br />because boundaries between them, and between the berm and <br />undisturbed area, were indistinguishable. Ditch here was more <br />trapezoidal than V-shaped. Appeared to be over-built, however. <br />3. ~ pt. along NW side of pile midway between 2nd and 3rd benches: <br />'ditch grade = 25%; riprapped <br />4. @ pt. near map location of cross section G-G: <br />'top width = 10.5'; bottom width = 4'; depth = 23"; riprapped <br />G. Single CMP Under Access Road 6 for southeast collection ditch: <br />'diameter = 30"; inlet and outlet clear <br />A section of the northwest collection ditch was filled with coal refuse on the north end of <br />the pile at a point about half-way between the confluence of the collection ditch with <br />drainage from benches 2 and 3. About 10 inches of ditch embankment or freeboard <br />remained on the outside of the ditch to contain drainage. The inside ditch embankment <br />had been overtopped and drainage flowed along the toe of the pile before reentering <br />the ditch. Coal refuse filled the ditch to a width of about 14.5" extending to the pile. <br />IV. Roadside Refuse Disposal Area <br />The RRDA is located on the easUsoutheast side of Interstate 70 south of the main mine <br />facilities area. Construction began in 1977 and the pile was temporarily reclaimed in <br />1988. Coal refuse is no longer added to the pile. Powderhorn presently uses the top <br />of the pile as a storage area. The pile will be permanently reclaimed when the top isn't <br />needed for storage any more. Bench and lift dimensions do not apply because such <br />features were not incorporated into the pile's initial construction. Vegetation appears to <br />be well established on the pile's outslope. Permanent reclamation will include <br />regrading the outslope, possibly constructing benches, and replacing the existing 6 <br />inches of top dressing with a covering of 18 inches of non-toxic, non-combustible <br />material based on the results of field trials. In conjunction with the refuse pile's <br />permanent reclamation, the uphill permanent diversion will be moved to a location <br />closer to the pile. Current disturbed area associated with the pile and the mine <br />facilities area is about 62.4 acres; the area associated only with the refuse pile and <br />associated ditches probably is about one-fourth of that total. <br />A water pipeline operated by the Ute Conservancy District skirts the south side of the <br />13 <br />