(1)  The Authority may, subject to subsection (2) , vary the provisions of a certified forest practices plan.

(2)  The Authority shall not exercise its powers under subsection (1) unless it has first afforded the person who applied to it under section 18 for certification of the plan (or a person to whom the applicant's responsibilities under this Division have been assigned in accordance with section 25D ) and the owner of the land referred to in the plan or, as the case may be, the holder of the forestry right conferred in respect of the land, an opportunity to make submissions to it in relation to the matter.

(3)  Where the Authority varies the provisions of a certified forest practices plan, it shall, by notice in writing served on the person who applied to it under section 18 for certification of the plan (or a person to whom the applicant's responsibilities under this Division have been assigned in accordance with section 25D ) and the owner of the land referred to in the plan, inform them of the variation, and the variation shall, subject to section 25 (3) , take effect on such date as the Authority specifies in the notices, being a date not earlier than 14 days after the service of the notice on the first-mentioned person.