1. When the operator completes the backfilling, regrading and drainage control of a bonded area in accordance with his approved reclamation plan, the release of sixty percent (60%) of the bond or collateral for the applicable permit area;

2. After revegetation has been established on the regraded mined lands in accordance with the approved reclamation plan. When determining the amount of bond to be released after successful revegetation has been established, the Department shall retain that amount of bond for the revegetated area which would be sufficient for a third party to cover the cost of reestablishing revegetation and for the period specified for operator responsibility of reestablishing revegetation. No part of the bond or deposit shall be released under this paragraph so long as the lands to which the release would be applicable are contributing suspended solids to streamflow or runoff outside the permit area in excess of the requirements set by law. No part of the bond shall be released until soil productivity for prime farmlands has returned to equivalent levels of yield as nonmined land of the same soil type in the surrounding area under equivalent management practices as determined from the soil survey. When a silt dam is to be retained as a permanent impoundment, the remaining portion of bond may be released under this paragraph so long as provisions for sound future maintenance by the operator or the landowner have been made with the Department; and

3. When the operator has completed successfully all surface coal mining and reclamation activities, the release of the remaining portion of the bond, but not before the expiration of the period specified for operator responsibility. No bond shall be fully released until all reclamation requirements of this act are fully met.