Sec. 11. The engineer's estimate of costs under section 10(a)(2) of this chapter must include:
(1) the cost of acquiring or constructing the sewage works;
(2) the cost of all property, easements, franchises, and other rights considered necessary or convenient for the works;
(3) interest on bonds before and during the construction or acquisition, and for a period not exceeding twenty-four (24) months after completion of the construction or acquisition;
(4) engineering expenses, including expenses for plans, specifications, and surveys;
(5) legal expenses;
(6) expenses for estimates of cost and of revenues;
(7) administrative expenses; and
(8) other expenses necessary or incidental to:
(A) determining the feasibility of the works;
(B) financing the works;
(C) constructing or acquiring the works; and
(D) placing the works in operation.