(2) The undertaker must ensure that timely and efficient notices to mariners and other
navigational warnings of the position and nature of the authorised scheme seaward of MHWS, are issued during and after the period of construction, alteration, replacement or decommissioning of the authorised scheme, such information to be promulgated to mariners in the shipping and fishing industry as well as to recreational mariners, in accordance with condition 6(8) and (9).
(3) The undertaker must notify Trinity House as soon as reasonably practicable of both the
progress and completion of the authorised scheme seaward of MHWS and any aids for navigation established from time to time.
(4) The undertaker must provide reports on the availability of aids to navigation periodically as
requested by Trinity House. (5) The undertaker must colour all structures yellow from at least highest astronomical tide to a
height directed by Trinity House, or must colour the structure as directed by Trinity House from time to time.
(6) In case of injury to, or destruction or decay of, the authorised scheme or any part thereof the
undertaker must as soon as reasonably practicable notify Trinity House and must lay down such buoys, exhibit such lights and take such other steps for preventing danger to navigation as Trinity House may from time to time direct.
Chemicals, drilling and debris 8.—(1) Unless otherwise agreed in writing by the MMO all chemicals used in the construction
of the authorised scheme must be selected from the List of Notified Chemicals approved for use by the offshore oil and gas industry under the Offshore Chemicals Regulations 2002 (as amended).
(2) All protective coatings and paints must be suitable for use in the marine environment and,
where necessary, approved by the Health and Safety Executive. The use of such coatings must accord with best environmental practice.
(3) The storage, handling, transport and use of fuels, lubricants, chemicals and other substances
must be undertaken so as to prevent releases into the marine environment, including bunding of 110% of the total volume of all reservoirs and containers.
(4) Where foundation drilling works are proposed, in the event that any system other than water-
based mud is proposed the MMO’s written approval in relation to the proposed disposal of any arisings must be obtained before the drilling commences, which may also require a marine licence.
(5) The undertaker must ensure that no waste concrete slurry or wash water from concrete or
cement works are discharged into the marine environment. Concrete and cement mixing and washing areas should be contained to prevent run off entering the water through the freeing ports.
(6) The undertaker must ensure that any oil, fuel or chemical spill within the marine
environment is reported to the MMO, Marine Pollution Response Team. (7) The undertaker must ensure that any waste and/or debris arising from the construction of the
authorised scheme or from equipment or temporary works placed below MHWS are removed on completion of the authorised scheme.
(8) At least 10 days prior to the commencement of the licensed activities the undertaker must
submit and obtain the MMO’s approval of an audit sheet covering all aspects of the construction of the authorised scheme. The audit sheet must include details of—
(a) loading facilities; (b) vessels; (c) equipment; (d) shipment routes; (e) working schedules; and (f) all components and materials to be used in the construction of the authorised scheme. (9) The audit sheet must be maintained throughout the construction of the authorised scheme
and any changes notified immediately in writing to the MMO. 121
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