Prior to any advanced refunding the governing board of any public agency which shall have outstanding bonds shall find either:
In the event any governing board shall undertake to effect an advanced refunding pursuant to Chapter 17, 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, Title 6 and this chapter for the purpose of constructing such improvements.
S.C. Code § 11-21-40