(A) Protection Measures: All development within the Watershed Protection Overlay District shall demonstrate compliance with the requirements of this Section at the time of development permit approval, except as set forth in (B) below;
(B) Exception for Existing Development: Development existing as of June 21, 1993 is not subject to the requirements of this Section. Expansions to existing development must meet the requirements of this Section; however, the impervious surface area of the existing development is not required to be included in the density calculations. A pre-existing lot owned by an individual or assignee prior to the effective date of June 21, 1993, regardless of whether or not a vested right has been established, may be developed for single family residential purposes without being subject to the restrictions of this Section.