Okla. Admin. Code § 35:17-9-2
The following words or terms, when used in this subchapter, shall have the following meaning, unless the context clearly indicates otherwise:
"Animal waste" means animal excrement, animal carcasses, feed wastes, process wastewaters or any other waste associated with the confinement of animals from an animal feeding operation.
"Compost facility" or "facility"means a facility where source material is converted, under thermophilic conditions, to a product with high humus content for use as a soil amendment or to prevent or remediate pollutants in soil, air, and storm water run off. This includes all contiguous land and structures, other appurtenances, and improvements on the land used for the handling, processing, storage, or disposal of compost and source materials or ingredients used in producing compost.
"Leachate" means liquid that has passed through or emerged from animal waste or materials being composted, and may contain soluble, suspended, or mixable materials removed from the source material.
"Operator" means the owner and person responsible for the management of the facility.
"Source material" means material used as the main organic source to be converted by thermophilic conditions into compost and may include but not be limited to manure and other animal waste.
Okla. Admin. Code § 35:17-9-2