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842.11(b) and 843.12(a)(2), OSM has violated the cooperative <br />agreement and has undermined DMG's enforcement authority concern- <br />ing the issuance of the NOV. Accordingly, OSM's NOV is void. <br />B. <br />WHETHER DMG'S PERMITTING DECISIONS AND KERR'S <br />COMPLIANCE THEREOF SATISFIED STATE APPROXIMATE <br />ORIGINAL CONTOUR STANDARDS <br />Colorado Rule 4.14.1(2)(a) provides that except as exempted <br />in the rules, all areas disturbed by surface coal mining oper- <br />ations shall be returned to their approximate original contour. <br />"Approximate original contour" means that surface configuration <br />achieved by backfilling and grading of the mined area so that the <br />reclaimed area, including any terracing or access roads, closely <br />resembles the general surface configuration of the land prior to <br />mining and blends into and compliments the drainage pattern of <br />the surrounding terrain, with all highwalls and spoil piles elim- <br />inated. § 34-33-103(3), C.R.S. <br />OSM's policy directive on AOC provides the standards it <br />uses to make AOC determinations and the deference that must be <br />given to a state's determination when such state has primary <br />jurisdiction, such as here. See attached copy of Policy Direc- <br />tive INE-26. The directive provides in relevant parts as fol- <br />lows: <br />-9- <br />