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3.85 EROS~oa coa„eAl_ t-,aa R.:k F~n» Cwr.~y A.ra-)J • EXCESSIVE RILL AND GULLY PLAN Since Northern Coal Company was careful to properly compact the reclaimed areas, spread adequate topsoil and re-seed and mulch diligently, it is not expected that excessive rills and gullies will form. The re-established channel at the Rienau 112 minesite is not considered a gully. Technical revision 02 allows downcutting of this channel to 24 inches. A cross-section of the undisturbed channel immediately above the minesite is enclosed. Also enclosed is a cross-section of the re-established channel approximately midway up the reclaimed slope. As is seen from the cross-sections, the channel on the reclaimed slope is much more shallow and mild. The reclaimed channel should be allowed to cut 24 inches in a configuration similar to that shown far the undisturbed channel. If the sidewalls become too steep, filling in , placement of erosion control material or regrading will be performed. In any case, the channel configuration will be maintained . At all other locations on the reclaimed area, the following measures will be taken for rills and gullies over nine inches in • depth (1) If rills and gullies occur an areas too steep for machinery, they will either be filled in by hand with shovels and rakes or partially filled in, with placement of small dams at regular intervals. The gully will then be seeded and mulched according to the approved reclamation plan. This method has been used at other reclamation sites in Colorado with good success because the dams trap moisture uphill in the gully causing seeds in the mulch to sprout. The resulting vegetation anchors the ground and causes a natural filling of the gully without any adjacent disturbance. Where complete filling is done, the area will be mulched and seeded according to the approved reclamation plan. (2) If rills and gullies occur on mild slope areas, and the extent necessitates a tractor, a small garden tractor with a field cultivator and/or rear blade will be used. The use of this small tractor will keep disturbance to adjoining areas to a minimum. If the area to be filled in is too wet, reclamation work will have to wait until conditions are dry enough so as not to leave ruts and harm vegetation. If the rills and gullies are not extensive, manual labor may be used as described in (1) above. In either case, the re-worked areas will be re-seeded and mulched • according to the approved reclamation plan. C -5 I 7i~/~~ ~;i~~~