(1)    No plan developed under this subchapter which involves financial assistance under s. 33.16 may be formally adopted for implementation by the district until the department approves the plans or whatever modifications it finds appropriate. If the department modifies an application by order, it shall clearly explain reasons why the modifications are being made.

   (2)   Following receipt of the department’s order, the district may adopt the approved plan by resolution, in which case it shall forward a copy of the resolution and plan to the department.

   (3)   The district may then carry out the adopted plan of implementation.

   (4)   Implementation work may consist of any work in the lake or its watershed which will protect or enhance the opportunities for public enjoyment of the lake.