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Impervious Surfaces: A surface composed of any material that impedes or prevents natural infiltration of water into the soil and qualifies as “built-upon area” as defined by NCGS 143-214.7, as amended.

Independent Living Facility: A facility consisting of a single building or group of buildings with one ownership and management in which the residents are persons at least 55 years of age, their spouses, and/or their surviving spouses, and with or without an on-site resident manager. Residents live in their own dwelling units. The facility maintains a common dining room and typically provides personal services such as transportation, banking, and/or a barber shop/hair salon; recreational activities and amenities; concierge services; and housekeeping for residents and their guests. Health maintenance services and/or treatment are not provided.

Initial Zoning Map Change: A zoning map change that establishes the City’s zoning authority over newly annexed territory, per NCGS 160D-202(g), or establishes the County’s zoning authority over newly relinquished territory, per NCGS 160D-202(h).

Intermodulation Distortion: The preventable and avoidable results of the mixture of two certain and specific radio frequencies (3rd Order); or more certain or specific radio frequencies (5th Order), that creates at least one other unwanted, undesirable, and interfering radio frequency (3rd Order), or multiple other unwanted, undesirable, and interfering radio frequency signals (5th Order).

Internal Campus: All areas within the UC and UC-2 Districts that are not included within a transitional use area.

Inventory: See Durham Inventory.