The permanent protection shall prohibit residential, industrial, or commercial use of open space land, including power generation facilities (except in connection with agriculture, forestry, and passive recreation), and shall not be amendable to permit such use. Access roads, driveways, wells, underground sewage disposal facilities, local utility distribution lines, stormwater management facilities, trails, temporary structures for passive outdoor recreation, and agricultural structures shall be permitted on preserved open space land with Planning Board approval, provided that they do not impair the conservation value of the land. Forestry shall be conducted in conformity with applicable best management practices.