Composting time and temperatures shall meet the following requirements:
- (1) Windrow composting. The compost material must be maintained at a minimum average temperature of 55°C (131° F) or higher for 15 days or longer. The 15 or more days at or above 55°C (131° F) do not have to be continuous.
- (2) Aerated static pile or in-vessel composting process. Material maintained at a minimum average temperature of 55°C (131° F) or higher for three continuous days, followed by at least 14 days with a minimum of 45°C (113° F).
- (3) Passive pile. Material maintained below 75°C (170° F) for the active composting period. Finished compost must meet standards as specified in the permit or plan.
- (4) Hybrid composting. Material maintained as specified in the permit or plan.
Added at 34 Ok Reg 1199, eff 9-15-17