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"Clean Water Act" or "CWA" means the federal Clean Water Act (33 U.S.C. §1251 et seq.), formerly referred to as the Federal Water Pollution Control Act of Federal Water Pollution Control Act Amendments of 1972, Public Law 92-500, as amended by Public Law 95-217, Public Law 95-576, Public Law 96-483, and Public Law 97-117, or any subsequent revisions thereto. "Department" means the Virginia Department of Environmental Quality "Development" means land disturbance and the resulting landform associated with the construction or demolition of residential, commercial, industrial, institutional, recreation, transportation or utility facilities or structures or the clearing of land for non-agricultural or non- silvicultural purposes. "Developed property" means any parcel which contains impervious surface area equal to or greater than 300 square feet or semi-pervious surface area equal to or greater than 600 square feet, or any combination equal to or greater than 300 square feet. "Exempt property" means any parcel which is owned by any federal, state or local agencies on which the agency provides for maintenance of the storm drainage and stonnwater facilities, provided the proper permits for such facilities have been obtained from the Department of Environmental Quality. "General permit" means the state permit titled GENERAL PERMIT FOR DISCHARGES OF STORMWATER FROM CONSTRUCTION ACTIVITIES found in Part XIV (9VAC25-880-let seq.) of the Regulations authorizing a category of discharges under the CWA and the Act within a geographical area of the Commonwealth of Virginia "Impervious surface area" means surfaces, such as parking lots, sidewalks, driveways and roofs, on or in a lot or parcel of property which prevent the infiltration of water into the earth. "Land disturbance" or "Land disturbing activity" means aman-made change to the land surface that potentially changes its runoff characteristics including clearing, grading, or excavation except that the term shall not include those exemptions specified in Section 31.2-3(c) of this ordinance. "Layout" means a conceptual plan showing the nature of the land-disturbing activity proposed for the site and the type and location of any associated stormwater management facilities required at the time of approval. "Minor modification " means an amendment to an existing general permit before its expiration not requiring extensive review and evaluation including, but not limited to, changes in EPA promulgated test protocols, increased monitoring frequency requirements, changes in sampling locations ,and changes to compliance dates within the overall compliance schedules. A