254. In the case of a well whose risk potential has been classified as moderate under Schedule 3, the authorization holder must(1) install, at the bottom of the hole, a blow-out preventer valve and a casing plug or a support plug; and
(2) fill the well with non-saline water or with a corrosion inhibiting fluid; an anti-freeze fluid must also protect at least the first 2 m below the surface of the bottom of the water.