15(1)Paragraph 14 above shall not apply to any subsoil or under-surface of land required only for the construction of a work at a level more than the relevant distance below the level of the surface of the land.U.K.
(2)In sub-paragraph (1) above, the reference to the relevant distance is—
(a)in the case of a work consisting of a pedestrian tunnel or ground anchor, 2 metres, and
(b)in the case of any other work, 9 metres.
(3)For the purposes of sub-paragraph (1) above, the level of the surface of the land shall be taken—
(a)in the case of any land on which a building is erected, to be the level of the surface of the ground adjoining the building, and
(b)in the case of a watercourse or other area of water, to be the level of the surface of the adjoining ground which is at all times above water level.