Access areas and access lanes shall be maintained to prevent weeds, woody vegetation and provide clear access routes for vehicles. Vegetation shall be mowed if height is over 24 inches and/or annual mowing after August 15th. Grass waterways and adjacent outlets shall be maintained to prevent woody vegetation growth, undesirable weeds and facilitate movement of water in the grass waterway. Vegetation shall be maintained at a minimum height of 8 inches, maximum height of 12 inches. Grass may be baled and removed from site with consent from the Forest Preserve. Contour grass strips, grassed waterways, terraces and basins shall be maintained to prevent woody vegetation growth and undesirable weeds. Occasionally, maintenance will be needed to remove sediment from the edge of the contour grass strips and grassed waterways. Occasionally, fallen trees or brush will need to be removed to keep fields and access open. Basin risers shall be maintained to prevent residues and debris from obstructing drainage...