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(3) The Intensely Developed Area (IDA) is an overlay of the RPA and the RMA as shown on the map entitled "Chesapeake Bay Preservation Areas, Portsmouth, Virginia" dated November 25, 2025. IDAs serve as redevelopment areas where little of the natural environment remained and at least one of the following conditions existed at the time of original local program adoption (September 1, 1990): a. Development had severely altered the natural state of the area such that it had more than 50 percent impervious surface; b. Public sewer and water systems, or a constructed stormwater drainage system, or both, had been constructed and served the area as of the original Chesapeake Bay Preservation Area Overlay Ordinance adoption date of September 1, 1990. (This condition did not include areas planned for public sewer and water or constructed stormwater drainage systems); or Housing density was equal to or greater than ten dwelling units per acre. (c) The Chesapeake Bay Preservation Area (CBPA) Map showing the general location of CBPAs should be consulted and, per section 9.1-9, a site-specific determination of the Resource Protection Area (RPA) shall be performed by persons contemplating regulated activities within the city. (d) Portions of RPAs and RMAs designated by the city council as Intensely Developed Areas shall serve as redevelopment areas. Areas so designated shall comply with all erosion and sediment control requirements and the performance standards for redevelopment in section 9.1-10. (e) If at least 25 percent of a lot, parcel, or development project lies within the boundaries of a CBPA, the entire lot, parcel, or development project shall comply with the requirements of this chapter. Sec. 9.1-7. Required conditions. (a) All development and redevelopment exceeding 2,500 square feet of land disturbance shall be subject to a plan of development process, including the approval of a site plan in accordance with the provisions of the zoning ordinance set out in chapter 40.2 or a subdivision plat in accordance with chapter 33.1. (b) The city may allow development in RPAs upon approval only if it complies with subsection 9.1-10(c). (c) A water quality impact assessment and a resiliency assessment shall be required for any proposed land disturbance within RPAs and for any development within RMAs when required by the city engineer because of the unique characteristics of the site or intensity of development, in accordance with the provisions of subsections 9.1-11(e) and 9.1(f).