Maintenance or minor alteration of existing public or private strucutres, facilities involving negligible or no expansion of use beyond current levels; the replacement or reconstruction of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure; and minor public or private alterations in the condition of land, water, and/or vegetation which do not involve removal of healthty, mature, scenic trees except for forestry and agricultural purposes.
