To guarantee the restoration, rehabilitation, and reclamation of mined-out areas, every applicant granted a mining permit as herein provided shall furnish a performance bond to the Village, in an amount to be determined by the Village Engineer as appropriate to the projected cost of replacement, but not less than ten thousand dollars ($10,000) as a guarantee that such applicant, in restoring, reclaiming and rehabilitating such land, shall within a reasonable time and to the satisfaction of the Planning Commission meet the following minimum requirements.
(a) Surface Rehabilitation. All excavation shall be made either to a water-producing depth, such depth to be not less than five feet below the low water mark, or shall be graded or backfilled with non-noxious, noninflammable and noncombustible solids, to secure:
(1) That the excavated area shall not collect and permit to remain therein stagnant water, or
(2) That the surface of such area which is not permanently submerged is graded or backfilled as necessary so as to reduce the peaks and depressions thereof, and to produce a gently running surface that will minimize erosion due to rainfall and which will be in substantial conformity to the adjoining land area.
(b) Vegetation. Vegetation shall be restored as per the approved site plan by the seeding of appropriate grasses or planting of shrubs or trees in all parts of mining area where such area is not to be submerged under water as hereinabove provided.
(c) Banks of Excavations Not Backfilled. The banks of all excavations not backfilled shall be sloped to the water line at a slope which shall not be less than three feet horizontal to one foot vertical and such bank shall be seeded.