The Hornsea Two Offshore Wind Farm Order 2016

Chemicals, drilling and debris

6.—(1) 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, unless otherwise agreed in writing by the MMO.

(2) The undertaker must ensure that any coatings or treatments are suitable for use in the marine environment and are used in accordance with guidelines approved by Health and Safety Executive or the Environment Agency Pollution Prevention Guidelines.

(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 disposal may also require a marine licence.

(5) The undertaker must ensure that, where practicable, any debris arising from the construction of the authorised scheme or temporary works placed seaward of MHWS is removed by a date no later than 28 days following the undertaker becoming aware of the debris after the completion of the authorised scheme (or by such later date as may be agreed in writing by the MMO). In the event that the debris cannot practicably be removed, the undertaker must notify the MMO, Trinity House and the MCA within 7 days of becoming aware that the debris cannot practicably be removed.

(6) At least 10 days before the commencement of the licensed activities, the undertaker must submit to the MMO an audit sheet covering all aspects of the construction of the authorised scheme, and no works may commence until the audit sheet content has been agreed with the MMO. 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.

(7) The audit sheet must be maintained throughout the construction of the authorised scheme, and the MMO must be notified of any changes on a fortnightly basis.

(8) In the event that the undertaker becomes aware that any of the materials on the audit sheet cannot be accounted for, it must notify the MMO within 24 hours where possible, and in any event within 5 days of becoming aware using the dropped object procedure form. On receipt of the dropped object procedure form, the MMO may require relevant surveys to be carried out by the undertaker (such as side-scan sonar) if reasonable to do so. Local fishermen must be invited to send a representative to be present during the survey. The MMO may require any new obstructions associated with the authorised scheme to be removed from the seabed at the undertaker’s expense if reasonable to do so.

(9) All debris arising from the operation and maintenance of the authorised scheme must be reported to the MMO using the dropped object procedure form within 24 hours where possible, and in any event within 5 days of the undertaker becoming aware of the incident. On receipt of the dropped object procedure form, the MMO may require relevant surveys to be carried out by the undertaker (such as side-scan sonar) if reasonable to do so and any new obstructions associated with the authorised scheme to be removed from the seabed at the undertaker’s expense if reasonable to do so.

(10) The undertaker must inform the MMO of the location and quantities of inert material and dredged material disposed of each month under this licence at each of disposal site reference HU211, disposal site reference HU209 and disposal site reference HU210, by submission of a disposal return for each disposal area by 31st January each year for disposals occurring during the months July to December inclusive of the preceding year, and by 31st July each year for disposals occurring during the months January to June inclusive of that year.

(11) The undertaker must ensure that only—

(a) inert material of natural origin and drilling mud, produced during construction drilling and seabed preparation for foundation works comprised in Work No. 2A;

(b) dredged material produced during seabed preparation for foundation works comprised in Work No. 2A; and

(c) inert material of natural origin and dredged material produced during cable laying preparation works comprised in Work No. 2A and Work No. 4A,

is disposed of at disposal site reference HU211.

(12) The undertaker must ensure that only—

(a) inert material of natural origin and drilling mud, produced during construction drilling and seabed preparation for foundation works comprised in Work No. 3A;

(b) dredged material produced during seabed preparation for foundation works comprised in Work No. 3A; and

(c) inert material of natural origin and dredged material produced during cable laying preparation works comprised in Work No. 4A,

is disposed of at disposal site reference HU209.

(13) The undertaker must ensure that only inert material of natural origin and dredged material produced during cable laying preparation works comprised in Work No. 4A is disposed of at disposal site reference HU210.

(14) The undertaker must ensure that no waste concrete slurry or wash water from concrete or cement works are discharged into the marine environment. Concrete, cement mixing and washing areas must be contained to prevent run-off entering the water through the freeing ports.

(15) The undertaker must ensure that any rock material used in the construction of the authorised scheme is from a recognised source, free from contaminants and containing minimal fines.

(16) The undertaker must notify the MMO within 48 hours of the completion of the final authorised disposal at disposal site reference HU211.

(17) The undertaker must notify the MMO within 48 hours of the completion of the final authorised disposal at disposal site reference HU209.

(18) The undertaker must notify the MMO within 48 hours of the completion of the final authorised disposal at disposal site reference HU210.