18.—(1) Where—
(a)any person is carrying on, or proposing to carry on, any activity on or in the ground; and
(b)that activity might lead to the input into groundwater of any hazardous substance or non-hazardous pollutant,
the Agency may serve notice in writing on that person prohibiting the carrying on of that activity.
(2) Failure to comply with a notice is an offence.