An Act authorizing the release of Project 70 restrictions on certain lands owned by the borough of Downingtown, Chester County, in return for imposition of Project 70 restrictions on other lands owned or to be obtained by the Borough of Downingtown, Chester County; and authorizing the release of Project 70 restrictions on certain land owned by the Township of Silver Spring, Cumberland County, in return for the imposition of Project 70 restrictions on certain land to be obtained by the Township of Silver Spring, Cumberland County.