(a) That a savings can be effected through advanced refunding;

(b) That existing covenants and agreements in the proceedings authorizing the outstanding bonds payable from revenue-producing projects hamper or impede the ability of the public agency to borrow monies which are then or thereafter required to provide for improvements, enlargements and extensions to such revenue-producing projects.

In the event any governing board shall undertake to effect an advanced refunding pursuant to Chapter 17 of Title 6 and this chapter, and at the same time to borrow for the purpose of constructing improvements to its revenue-producing project, it shall likewise have found that such improvements are then necessary and can be accomplished with the monies provided by the proceeds of the refunding bonds issued pursuant to Chapter 17 of Title 6 and this chapter for the purpose of constructing such improvements.