A. Maintaining adequate cover of native vegetation including trees and understory; if existing tree cover is less than a relative density of twenty (20), planting shall be required consisting of seedlings at a density of three hundred (300) stems per acre or the equivalent.

B. Provide a dense screen of native evergreen trees at the perimeter of the buffer, if existing vegetation is not sufficient to prevent viewing adjacent development from within the buffer. Planting shall be required equivalent to two (2) rows of three (3) foot high stock of native evergreens at a triangular spacing of fifteen (15) feet, or three (3) rows of gallon containers at a triangular spacing of eight (8) feet. Fencing may be required if needed to block headlights or other sources of light or to provide an immediate effective visual screen.

C. Provide a plan for control of invasive weeds, and remove existing invasive species.

D. Provide for a monitoring and maintenance plan for a period of at least five (5) years, except this provision may be waived for single-family residential lots.