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• (f) With respect to developments that are required to have an approved site plan, and involving land containing existing and/or required stream buffers, contour lines shall be shown at two -foot intervals. In any case where any proposed development requires an approved plan other than a site plan, the location of existing and required stream buffers shall be shown on such plan. Sec. 10-72. Management of a stream buffer. Each stream buffer required to be established or maintained pursuant to this article shall be managed as provided herein: (a) The target vegetative cover in a stream buffer area shall be an indigenous riparian forest with ground cover, shrub and tree canopy layers. (b) Within twenty-five (25) feet of the top of the stream bank: (1) Indigenous riparian vegetation shall be preserved, or, where it does not exist, it shall be restored or allowed to evolve by natural succession; (2) Dead, diseased, and dying trees may be removed; (3) Fallen trees that are blocking stream channels, or trees with undermined root systems in imminent danger of falling, may be removed where stream bank erosion is a current or potential problem that outweighs any positive effects the fallen tree or trees may have on the stream ecosystem; (4) Removal or pruning of invasive shrub and vine species is allowed, provided that such removal or pruning is done in a manner that prevents erosion; • (5) Unpaved pathways and trails may be constructed and maintained in a manner that will effectively control erosion and to minimize adverse impacts to the buffer, subject to applicable provisions of §10-74, below; and (6) Stonnwater channels may be constructed and maintained in a manner that will prevent erosion and minimize adverse impacts to the buffer. • (c) Beyond twenty-five (25) feet from the top of the stream bank to the limits of the required buffer: (1) Dead, diseased and dying trees may be removed; (2) Trees 6 inches in diameter or greater, measured 48 inches from the ground, shall be preserved; (3) Removal or pruning of invasive shrub and vine species shall be allowed, provided that such removal or pruning is done in a manner that prevents erosion; and (4) Unpaved pathways and trails may be constructed and maintained in a manner that will effectively control erosion and minimize adverse impacts to the buffer, subject to applicable provisions of § 10-74, below. (5) Stormwater channels may be constructed and maintained in a manner that will prevent erosion and minimize adverse impacts to the buffer. Sec. 10-73. Development exempt from stream buffer requirements. The following types of development shall not be required to retain, establish or manage a stream buffer, provided that the requirements of this section are satisfied: -26-