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<br />Revised 04/20/90 <br />Section 816.104(b) Continued. <br />(1) Haul or convey, backfill, and grade, using all available spoil and <br />suitable waste materials from the entire mine area, to attain the lowest <br />practicable stable grade, to achieve a static safety factor of 1.3, and <br />to provide adequate drainage and long-term stability of the regraded areas <br />and cover all acid-forming and toxic-forming materials. <br />(2) Eliminate highwalls by grading or backfilling to stable slopes not <br />exceeding lv:2h (50 percent), or such lesser slopes as the regulatory <br />authority may specify to reduce erosion, maintain the hydrologic balance, <br />or allow the approved postmining land use. <br />(3) Haul or convey, backfill, grade, and revegetate in accordance with <br />Sections 816.111-816.117, to achieve an ecologically sound land use <br />• compatible with the prevailing use in unmined areas surrounding the mine <br />plan area; and <br />(4) Haul or convey, backfill, and grade, to ensure impoundments are <br />constructed only where-- <br />(i) It has been demonstrated to the regulatory authority's satisfaction <br />that all requirements of Sections 816.41-816.56 have been met; and <br />(ii) The impoundments have been approved by the regulatory authority as <br />suitable for the approved postmining land use and as meeting the <br />requirements of this Part and all other applicable Federal and State laws <br />and regulations. <br />As stated in 816.101 and 816.104 (a) above, the proposed mining <br />operations do not meet the regulatory criteria for designation under <br />the thin overburden provisions; therefore, thin or insufficient <br />overburden considerations are not applicable. <br />816-139 <br />