# Channel Tunnel Act 1987, Paragraph 4


(1) Not less than 56 days before beginning to construct the drainage lagoon or other drainage works for the terminal area the Concessionaires shall submit to the Authority a description of the terminal area together with plans and full particulars of the drainage lagoon or such other drainage works or, as the case may be, both the lagoon and such other drainage works as they may propose for or in connection with the discharge of surface water.
(2) The said works shall not be constructed except in accordance with a specification and plans approved by the Authority or settled by arbitration and in accordance with any reasonable requirements made by the Authority for the protection from pollution of any watercourse or underground strata.
(3) The requirements which the Authority may make under sub-paragraph (2) above include the construction of such works by and at the expense of the Concessionaires as are reasonably necessary for the interception, treatment and disposal of any poisonous, noxious or polluting matter contained in the run-off from the terminal area.
(4) If within a period of 28 days after the submission of the specification and any plans under sub-paragraph (1) above the Authority do not inform the Concessionaires in writing that they disapprove of those plans, stating the grounds of their disapproval, they shall be treated for the purposes of this paragraph as having approved them.

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Source: https://www.legislation.gov.uk/ukpga/1987/53/schedule/7/part/VIII/paragraph/4 (the official version)
Page: https://openlegislation.uk/channel-tunnel-act-1987/schedule-7/part-VIII/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.