"Closure" means actions that will prevent, mitigate, or minimize the threat to public health and the environment posed by a closed solid waste disposal facility including application of final cover; grading and seeding of final cover; installation of an adequate monitoring system, if necessary; and construction of ground and surface water diversion structures.
For mixed municipal solid waste, the measure of "equivalent" or "equivalent cubic yards of waste" is 3.33 cubic yards per ton of waste.
(1) the permittee of a mixed municipal solid waste disposal facility that has an agency permit; or
(2) the person in control of a mixed municipal solid waste disposal facility that does not have an agency permit.
"Postclosure" and "postclosure care" mean actions taken for the care, maintenance, and monitoring of a solid waste disposal facility after closure that will prevent, mitigate, or minimize the threat to public health and environment posed by the closed facility.