4. For the purpose of the definition of “exempt water discharge activity”, the requirements are—
(a)that a water discharge activity—
(i)falls within a description in Part 2 of Schedule 3, and
(ii)satisfies, in relation to an activity of that description, the relevant conditions specified in Part 2 of that Schedule;
(b)that the water discharge activity is registered and, subject to paragraph 9(10) of this Schedule, for a water discharge activity that falls within a description in—
(i)paragraph 1 of Part 2 of Schedule 3, the operator is registered in relation to the activity, or
(ii)paragraph 2 of Part 2 of that Schedule, the occupier is registered in relation to the activity; and
(c)that the water discharge activity does not cause pollution of inland freshwaters, coastal waters or relevant territorial waters.