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Section 816.102 (e) Continued. <br />• minimize subsequent erosion and instability. If such grading, pre- <br />paration, or placement along the contour is hazardous to equipment <br />operators, then grading, preparation, or placement in a direction other <br />than generally parallel to the contour may be used. In all cases, <br />grading, preparation, or placement of spoil shall be conducted in a <br />manner which minimizes erosion and provides a surface for replacement of <br />topsoil which will minimize slippage. <br />Final grading before topsoil placement will be done along contour <br />by dozers and motorgraders, unless a specific area would cause a <br />safety hazard to the operator, in which case grading would be other <br />than along contour. Specific discussion of the plan for and <br />sequence of backfilling and grading is set forth in the discussion <br />under Section 780.18 and is also shown on Energy Mines No. 1 and 2 <br />Spoil Grading Plan (Pfap 43) and Eckman Park Spoil Grading Plan <br />(I•iap 44). Topsoil placement will be stabilized in these areas <br />. with the use of farming equipment by discing and/or furrowing. <br />Section 616.103 Eackfilling and grading: Covering coal and acid- <br />and toxic-forming materials. <br />(a) Cover. (1) A person rrho conducts surface mining activities shall <br />cover, with a minimum o` 4 feet of the best available nontoxic and non- <br />combustible material, all exposed coal seams remaining after mining, and <br />all acid-forming materials, toxic-forming materials, combustible materials, <br />or any other materials identified by the regulatory authority, as exposed, <br />used, or produced during mining. <br />(2) if necessary, these materials sheL be treated to neutralize <br />toxici*_y, in order to prevent water pollution and sustained combustion <br />and minimize adverse effects on plant growth and land uses. <br />(3) 4;here necessary to protect against upward migration of salts, er.- <br />• <br />816-131 <br />