1. An owner shall have two years from the date that a site plan is approved for land disturbing activity subject to this section where no other tract improvements are proposed either to secure site plan approval for development of the tract or to revegetate the site.

2. Revegetation required by this section shall not be required upon approval of a site plan for site improvements for that portion of the development tract with such improvements proposed. The remainder of the development tract shall continue to require revegetation until a site plan showing other site improvements is approved. A preliminary plat does not relieve the applicant of the requirements of this paragraph.

3. Revegetation is required only where land disturbing activity has taken place, and no site plan for improvements has been approved within two years.

1. So long as the required mass grading buffers pursuant to this section have been provided and maintained, revegetation of a tract with a ground cover sufficient to restrain erosion shall satisfy the requirement for revegetation.

2. If the required mass grading buffers were not provided and maintained, revegetation of a tract shall create a biological community composed of a mixed and variable assemblage of native vegetation which is appropriate for the existing site conditions with at least three different species of trees native to Durham County and a tree density of at least 200 living trees per acre, with at least 50% of those trees having the potential of attaining a two and one-half inch or greater dbh within seven years.