A permit under this part to dredge or place dredged spoil on bottomland is subject to all of the following:

    (a) The permit shall be valid for a period of 5 years.

    (b) During the term of the permit, the department shall not require additional environmental studies or surveys unless an act of God results in significant geological or ecological changes to the permitted area.

    (c) The permit shall allow, at the discretion of the applicant, open lake disposal of dredge material that is not contaminated with toxic substances as defined in R 323.1205 of the Michigan administrative code in waters at the 30-meter depth contour or deeper. However, dredge materials shall not be disposed of within a Great Lakes bottomland preserve established under part 761, a permitted submerged log removal area under part 326, or a lake trout or diporeia refuge.