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S =Slope of channel in feet per feet A woven filter fabric may be installed under the loose rock check dams to improve stability and function. Sediments will be removed behind loose rock check dams when they equal or exceed one-half of the dam height. Loose rock check dams will be left in place in reconstructed drainage channels. It will not be necessary to clean out loose rock check dams used in reconstructed drainage channels on reclaimed areas. 2.1.2 Surface Treatments and Slope Protection Surface treatments and slope protection practices serve to provide temporary stabilization for the soil surface at any time during operational disturbance and while vegetation is being established during reclamation. These treatments and practices also reduce surface flows and trap sediment. In reclaimed areas these treatments promote water harvesting and conservation. Factors that affect selection of a surface treatment or slope protection practice are slope steepness, slope length, soil physical characteristics, aspect, types and amounts of surface water flows to be controlled and the potential ability to revegetate the location. All of these variables may be considered on asite-specific basis when planning and implementing surface treatments and slope protection. 2.1.2.1 Ripping, Disking, and Plowing Ripping, disking, and plowing roughen the surface by loosening and plowing it up into linear rows. Ripping is usually performed by a motorgrader or a bulldozer equipped with a single or gang of ripper shanks. Disking and plowing are accomplished using a variety of agricultural implements. Ripping will be performed along the contour. Bulldozers must be used for steeper slope ripping in order to remain on contour. This type of surface roughening may be performed at any time within the disturbed area. There are two points in the reclamation process where it is most effectively employed. Prior to soil reconstruction the graded surface may be ripped to provide an effective interface between subsoil and topdressing. Roughening at this stage of the soil reconstruction process serves to prevent topdressing slippage or circular slope failures. It may also promote subsoil moisture retention. The second time is following completion of soil reconstruction and immediately prior to commencement of revegetation operations. Care must be taken when ripping, disking or plowing topdressing so that operations avoid turning over the soil and bringing up excessive amounts of subsoil materials. 2.1.2.2 Contour Furrows Contour furrows are placed perpendicular to the slope on the contour using a modified Rome disc, duck's-foot plow, or similar agricultural implement. Furrows are normally spaced 3 to 4 feet apart and may range from 6 to 12 inches in depth depending on soil Preliminary Response Plan A_(~ Yankee Gulch Sodium Minerals Project American Soda, L.L.P.