Constituting the Sixth Supplemental Ordinance to the General Gas Works Revenue Bond Ordinance of 1998 (the "1998 General Ordinance"); authorizing the Mayor, the City Controller and the City Solicitor, or a majority of them, to sell, either at public or private sale, Gas Works Revenue Bonds, Fifth Series (1998 Ordinance), of the City of Philadelphia, in one or more subseries (the "Fifth Series Bonds") to be issued to pay the cost of certain capital projects, the cost of refunding or redeeming all or a portion of certain outstanding Gas Works Revenue Bonds and other Project Costs, as hereinafter — Open Common Ground