Okla. Stat. tit. 27A § 2-10-801.1
The owner or operator of any commercial solid waste landfill, over fifty (50) feet in height above natural surface contours that accepts more than two hundred (200) tons per day of solid waste, must submit a vegetation plan to the Department of Environmental Quality for approval. The vegetation plan shall address establishment and maintenance of appropriate vegetative cover for the purposes of erosion and dust control and aesthetic enhancement. The vegetation plan shall be implemented in waste disposal areas that have been undisturbed for ninety (90) days. The Department may approve an alternative plan that accomplishes similar objectives. The Environmental Quality Board shall promulgate rules, developed and recommended by the Solid Waste Management Advisory Council, relative to the contents of the plan.
Okla. Stat. tit. 27A, § 2-10-801.1