A progressive restoration and rehabilitation plan showing both existing contours and proposed final contour after operations are completed is submitted for approval. The rehabilitation plan shall be completed within six calendar months after termination of the extractive operation or other soil mining activity, and shall include, but not be limited to, restoration of the premises by grading, seeding, liming, fertilizing, sodding, etc., so that the premises are left in a safe and attractive condition commensurate with the surrounding landscape. Insofar as it is practical, the plan will provide for the return of the premises to slopes of less than one vertical foot per three horizontal feet and to eliminate gullies and holes. Ponds created during operations shall not become public nuisances dangerous to the general health, safety and welfare of the general public. Insofar as is possible, operations will not be permuted to significantly disturb the natural drainage pattern of the area; however, if such does occur, the plan of reclamation shall provide for the restoration of the natural drainage pattern of the area.