7.—(1) The Agency may, by notice served on the holder of a permit, suspend or revoke the permit—
(a)if any condition of the permit is breached, or
(b)if the environmental conditions of the inland waters to which the permit relates have changed since the date on which the permit was granted, such that the Agency considers that a suspension or revocation of the permit is necessary.
(2) The Agency may, by notice served on the holder of a permit, vary the permit if in the Agency’s opinion the permit requires revision.
(3) The Agency may suspend, vary or revoke a permit at the request of the holder of that permit.