If the statement of objectives included in the Program as provided in § 23–303 of this subtitle declares that a major project to be constructed in whole or in part in one county is designed to provide services in whole or in substantial part to the other county, the major project may be disapproved with the concurrence of the county council of the county that is to receive the services. Notwithstanding subsection (a) of this section, the county council of the county in which the major project is located may direct modifications in location or change the proposed year of construction if the modification or change will not prevent the services being available when needed. The county council’s authority to direct modifications in the location of a major project described in subsection (a) of this section may be exercised to effect reasonable changes in the location of the major project by the county council of the county in which the major project is located when the major project is first approved as a part of a Program. After approval of a major project in a Program, the county council of the county in which the major project is located may make further modifications only if: the modifications do not result in substantial net additional costs or expenses to the Commission; or the county directing the modifications reimburses the Commission for substantial net additional costs or expenses.