Certain boundary line adjustments; Chesapeake Bay Preservation Act. Requires a locality to provide, by ordinance, that a boundary line adjustment that applies to lots that are located in a Resource Protection Area and that are grandfathered under the Chesapeake Bay Preservation Act does not create a new lot of record. The bill requires such ordinance to include that such boundary line adjustment shall be considered as a lot that predates the Act. The bill clarifies that its provisions do not limit a locality's zoning authority. The bill also directs the State Water Control Board to amend its criteria under the Act to allow an owner of a lot in any locality that predates the Act to submit an application for a boundary line adjustment without creating a new lot of record.