Authorizing the revision of lines and grades on a portion of City Plan No. 58 by striking from the City Plan and vacating Melon Street from Park Avenue to Ridge Avenue and striking from the City Plan and abandoning a portion of a right-of-way reserved for drainage purposes and water main purposes in the bed of former Potts Street from Thirteenth Street to Broad Street, south of Fairmount Avenue, all under certain terms and conditions. — Open Common Ground