In the event the board shall so determine, any authority may make sale of all or any part of its properties and assets and distribute the proceeds among the participating municipalities and the counties in the proportion each such unit contributed to the authority's funds or otherwise in the manner set forth in the agreement establishing the authority, provided, no sale of properties or assets and no distribution of proceeds of such sale shall be done in a manner which violates United States law or the terms of any deed, grant agreement, or other agreement with the United States.