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11 Sec. 9.1-10. Performance standards. (a) Purpose and intent. The performance standards establish the means to minimize erosion and sedimentation potential, reduce land application of nutrients and toxics, and maximize rainwater infiltration. Natural groundcover, especially woody vegetation, is most effective in holding soil in place and preventing site erosion. Indigenous vegetation, with its adaptability to local conditions without the use of harmful fertilizers or pesticides, filters stormwater runoff. Minimizing impervious cover enhances rainwater infiltration and effectively reduces stormwater runoff potential. The purpose and intent of these requirements are also to implement the following objectives: prevent a net increase in nonpoint source pollution from new development; achieve a ten percent reduction in nonpoint source pollution from development on previously developed land where the runoff was not treated by one or more water quality best management practices; and achieve a 40 percent reduction in nonpoint source pollution from agricultural uses. (b) General performance standards for development and redevelopment. (1) Land development, redevelopment, or disturbance shall be limited to the minimum area necessary to provide for the proposed use or development. a. The submitted site plan shall indicate the limits of the proposed land disturbance, including areas for clearing or grading and shall be limited to the minimum area necessary to provide for the construction footprint. These limits shall be clearly shown on submitted plan and physically marked on the development site. b. Ingress and egress during construction shall be limited to one access point. (2) Indigenous vegetation shall be preserved to the maximum extent practicable consistent with the use or development proposed and III accordance with the Virginia Erosion and Sediment Control Handbook. a. Existing trees over two inches in diameter at breast height (DBH) shall be preserved outside the. construction footprint. 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. b. Other woody vegetation onsite shall be preserved outside the approved construction footprint.