Sec. 6. If the department finds that the proposed work will not:
(1) endanger:
(A) the legally established water level of a lake; or
(B) the normal water level of a lake whose water level has not been legally established; or
(2) result in unreasonably detrimental effects upon fish, wildlife, or botanical resources;
the department shall promptly grant the request and issue a permit to the person requesting the permit.