Sec. 4. To add a purpose to an established district:
(1) the same procedure may be used as is provided for the establishment of a district; or
(2) the board may pass a resolution adding an additional authorized purpose to the district already established if the board has received a petition that:
(A) is signed by at least ten percent (10%) of the freeholders in the district; and
(B) requests the addition of the purpose to the district.