(a) In determination of the location of the district boundaries shown on the zoning maps, the following rules shall apply:

(1) Boundaries indicated as following streets, highways, alleys, railroads, or waterways shall be construed to follow centerlines of such features unless specifically noted otherwise. In instances where the zoning district line abuts tidal waters, the district line shall extend to the mean low water mark unless such tidal waters are otherwise placed in a zoning district.

(2) Any zoning district boundary shown extended to or into any body of water bounding the county shall be deemed to extend straight to the county boundary.

(3) Where a zoning district boundary line is indicated as dividing a parcel of land, the location of such boundary, unless the same is indicated by dimensions shown on the map, shall be determined by use of the scale appearing thereon, and shall be measured to the nearest foot.

(4) Where physical features existing on the ground are at variance with those shown on the zoning map, or in other circumstances not covered above, the board of zoning appeals, in accordance with the procedures established by section 15.1-495, Code of Virginia and this chapter shall interpret such boundaries.

(b) Interpretations by the zoning administrator with respect to situations not specifically addressed by the provisions of this chapter shall be issued in writing and shall become a part of a permanent file to be maintained and available for review in the office of the zoning administrator. Such interpretations shall describe the rationale for the decision and shall include citations of the specific policies of the board of supervisors, as expressed in the adopted comprehensive plan, which support the interpretation.

(c) Any decision, order, requirement or determination by the zoning administrator shall be rendered in writing and shall include the following statement:

You have thirty (30) days in which to appeal this decision to the Board of Zoning Appeals, in accordance with section 15.1-496.b, Code of Virginia, or this decision shall be final and unappealable.