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(2) Indigenous vegetation shall be preserved to the maximum extent practicable consistent with the use or development proposed and in accordance with the Virginia Stormwater Management Handbook (Version 1.1 and subsequent updates). Mature trees shall be protected during development and only removed where necessary, including to provide for the proposed use or development. b. Existing trees over 2 inches in diameter at breast height (DBH) and other woody vegetation shall be preserved outside the construction footprint. c. Diseased trees or trees weakened by age, storm, fire, or other injury, as documented in writing to the director of planning by a landscape architect or a certified arborist who holds a current membership in either the International Society of Arboriculture (ISA), the Tree Care Industry Association, or the American Society of Consulting Arborists (ASCA), may be removed. d. Clearing shall be allowed only to provide necessary access, positive site drainage, water quality BMPs, and the installation of utilities. e. Prior to clearing or grading, suitable protective barriers, such as fencing of a type detailed in the Landscape Planting and Protection Manual, Portsmouth, Virginia shall be erected 5 feet outside of the dripline of any tree or stand of trees to be preserved. These protective barriers shall remain so erected throughout all phases of construction. The storage of equipment, materials, debris, or fill shall not be allowed within the area protected by the barrier. (3) Land development, redevelopment or land disturbance which adds impervious cover shall minimize impervious cover to promote infiltration of stormwater into the ground consistent with the proposed use or development. Pervious surfaces where soil conditions and/or water table permit shall be used for any parking area, maneuvering aisle, or other low traffic driveway. During the design phase of development, use of the following means of minimizing impervious cover are encouraged: a. Placement of parking areas under multi -family, office, or commercial buildings. b. Use of shared parking where possible in mixed use developments. C. Construction of no more than the minimum number of parking spaces required by the zoning ordinance, chapter 40.2. d. Use of modular grid pavers on private property and in low -traffic zones. (4) Notwithstanding any other provisions of this chapter or exceptions or exemptions thereto, any land disturbing activity exceeding 2,500 square feet, including construction of all single-family houses, septic tanks, and drainfields, shall also comply with the requirements of chapter 11,1 of this Code (Erosion and Stormwater Management). Enforcement for noncompliance with the erosion and sediment control requirements referenced in this criterion shall be conducted under the provisions of the Virginia Erosion and Stormwater Management Act and attendant regulations. (5) Where the best management practices require regular or periodic maintenance in order to continue their functions, such maintenance shall be ensured through a maintenance