SCHEDULE 10 Marine Licence 3: Project A Offshore Transmission - Work Nos. 2A, 3A and 2T

PART 2 Conditions

Detailed offshore design parameters
3 (1) No meteorological station lattice tower may exceed a height of 315 metres above HAT.
(2) Meteorological mast foundation structures must be of 1 or more of the following foundation options: monopole, multi-leg, gravity base or floating structure secured by chain and anchor.
(3) No meteorological mast foundation structure employing a footing of driven piles may—
(a) have more than 4 driven piles;
(b) in the case of single-pile structures, have a pile diameter exceeding 10 metres or employ a hammer energy during installation exceeding 2,300 kilojoules;
(c) in the case of structures with 2 or more piles, have a pile diameter exceeding 3.5 metres or employ a hammer energy during installation exceeding 1,900 kilojoules.
(4) No meteorological mast foundation may have—
(a) a seabed footprint (excluding subsea scour protection) exceeding 1,735 square metres;
(b) a seabed footprint (including subsea scour protection) exceeding 4,657 square metres;
(c) a main supporting structure exceeding 51.5 metres in width.
4 (1) The total number of offshore platforms within Work No 1A must not exceed 7 comprising—
(a) up to 4 offshore collector platforms;
(b) 1 offshore converter platform; and
(c) up to 2 offshore accommodation or helicopter platforms,
provided that any of the platforms referred to in paragraphs (a) to (c) may be co-joined to create a combined platform fixed to the seabed by multi-leg or gravity base type foundations.
(2) The dimensions of any offshore collector platform (excluding towers, helicopter landing pads, masts and cranes) must not exceed—
(a) 75 metres in length;
(b) 75 metres in width;
(c) 85 metres in height above HAT.
(3) The dimensions of any offshore converter platform (excluding towers, helicopter landing pads, masts and cranes) must not exceed—
(a) 125 metres in length;
(b) 100 metres in width;
(c) 105 metres in height above HAT.
(4) The dimensions of any offshore accommodation or helicopter platform (excluding towers, helicopter landing pads, masts and cranes) must not exceed—
(a) 125 metres in length;
(b) 100 metres in width;
(c) 105 metres in height above HAT.
(5) The dimensions of any combined platform (excluding towers, helicopter landing pads, masts and cranes) must not exceed the total seabed footprint of the individual platforms incorporated within it.
(6) Offshore platform foundation structures must be of 1 or more of the following foundation options: gravity base or multi-leg.
(7) No offshore platform foundation structure employing a footing of driven piles may—
(a) have more than 24 driven piles;
(b) have a pile diameter exceeding 2.75 metres or employ a hammer energy during installation exceeding 1,900 kilojoules.
(8) Within Work No. 1A, the seabed footprint per offshore foundation (excluding subsea scour protection) must not exceed—
(a) in the case of an offshore collector platform, 5,625 square metres;
(b) in the case of an offshore converter platform, 12,500 square metres;
(c) in the case of an offshore accommodation or helicopter platform, 12,500 square metres.
(9) No offshore collector platform foundation may have a seabed footprint (including subsea scour protection) exceeding 9,025 square metres.
(10) No offshore converter platform foundation may have a seabed footprint area (including subsea scour protection) exceeding 17,400 square metres.
(11) No offshore accommodation or helicopter platform foundation may have a seabed footprint (including subsea scour protection) exceeding 17,400 square metres.
(12) The number of vessels actively carrying out impact piling as part of the installation of driven pile foundations must at no time exceed 2 within Work No. 1A.
5 (1) The total seabed footprint of foundation structures (excluding mooring buoys) within Work No. 1A (including subsea scour protection and drill arising deposits) must not exceed 1,116,850 square metres.
(2) The total seabed footprint of offshore platform foundation structures within Work No. 1A (including seabed scour protection and drill arising deposits) must not exceed 88,300 square metres.
6 (1) Within Work Nos. 1A, 2A and 3A, the HVDC cables must not, in total, exceed—
(a) 2 in number;
(b) 1 fibre-optic cable;
(c) 573.2 kilometres in length.
(2) Within Work Nos. 1A and 2A, the HVDC cables must not, in total, have cable protection (excluding cable crossings) exceeding—
(a) 2.57 square kilometres in area;
(b) 2,496,785 cubic metres in volume.
7 Within Work No. 1A, the HVAC cables must not, in total,—
(a) exceed 1,270 kilometres in length;
(b) have cable protection (excluding cable crossings) exceeding 660,000 square metres in area;
(c) have cable protection (excluding cable crossings) exceeding 413,000 cubic metres in volume.
8 Within Work No. 1A, the HVAC cable crossings must not, in total, exceed—
(a) 24 in number;
(b) 132,700 cubic metres in volume of cable crossing material;
(c) 147,100 square metres in seabed footprint.
9 Within Work Nos. 1A and 2A, the HVDC cable crossings must not, in total, exceed—
(a) 16 in number;
(b) 88,450 cubic metres in volume of cable crossing material;
(c) 98,100 square metres in seabed footprint.

10 Notifications and inspections
(1) The undertaker must ensure that—
(a) before carrying out any of the licensed activities, the undertaker informs the MMO of—
(i) the organisation undertaking the licensed activities and its primary point of contact;
(ii) the works being undertaken pursuant to this licence comprising those works necessary up to the point of connection with the generation assets including (without limiting paragraph 2)—
(aa) up to 4 offshore collector platforms; and
(bb) a network of cables for the transmission of electricity and electronic communications;
(iii) cable installation;
(iv) impact piling soft start procedures;
(v) the maximum total area and volume for any cables to be constructed pursuant to this licence; and
(vi) the maximum total area and volume for any cable protection to be constructed within the export cable corridor area pursuant to this licence;
(b) all works notified under this Condition when combined with any works notified under Condition 13 of Marine Licences 1 and 2 (as defined in the Order) and Condition 10 of Marine Licence 4 (as defined in the Order) do not exceed the maximum parameters set out in Schedule 1 to the Order;
(c) a copy of this licence and any subsequent amendments or revisions to it is provided to—
(i) all agents and contractors notified to the MMO in accordance with Condition 16; and
(ii) the masters and transport managers responsible for the vessels notified to the MMO in accordance with that Condition; and
(d) within 28 days of receipt of a copy of this licence, the organisations and primary points of contact referred to in paragraph (a) provide a completed confirmation form to the MMO confirming that they have read and will comply with the terms of this licence.
(2) Only those persons and vessels notified to the MMO in accordance with Condition 16 are permitted to carry out the licensed activities.
(3) Copies of this licence must also be available for inspection at the following locations—
(a) the undertaker’s registered address;
(b) any site office located at or adjacent to the construction site and used by the undertaker or its agents and contractors responsible for the loading, transportation or deposit of the authorised deposits;
(c) on board each vessel or at the office of any transport manager with responsibility for vessels from which authorised deposits are to be made.
(4) The documents referred to in sub-paragraph (1)(c) must be available for inspection by an enforcement officer at all reasonable times at the locations set out in sub-paragraph (3)(b).
(5) The undertaker must provide access, and if necessary appropriate transportation, to the offshore construction site or any other associated works or vessels to facilitate any inspection that the MMO considers necessary to inspect the works during the construction and operation of the authorised scheme.
(6) The undertaker must inform the MMO Marine Licensing Team and the MMO Coastal Office in writing at least 5 working days before commencement of the licensed activities or any phase of them.
(7) At least 7 days before commencement of the licensed activities or any phase of them, the undertaker must publish in the Kingfisher Fortnightly Bulletin details of the vessel routes, timings and locations relating to the construction of the authorised scheme or relevant phase.
(8) The undertaker must ensure that a notice to mariners is issued at least 10 working days before commencement of the licensed activities or any phase of them advising of the commencement date of Work Nos. 2A and 3A and the expected vessel routes from the local construction ports to the relevant locations.
(9) The undertaker must ensure that the notices to mariners are updated and reissued at weekly intervals during construction activities and within 5 days of any planned operations and maintenance works and supplemented with VHF radio broadcasts agreed by the MCA in accordance with the detailed construction and monitoring programme referred to in Condition 13(b). Copies of all notices must be provided to the MMO.
(10) The undertaker must notify—
(a) the United Kingdom Hydrographic Office at least 2 weeks before commencement, and no later than 2 weeks following completion, of the authorised scheme in order that all necessary amendments to nautical charts are made; and
(b) the MMO, MCA and Trinity House once the authorised scheme is completed and any required lighting or marking has been established.

11 Chemicals, drilling and debris
(1) All chemicals used in the construction of the authorised scheme, including any chemical agents placed within any monopole or other foundation structure void, 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 and managed in accordance with the chemical risk assessment and the marine pollution contingency plan.
(2) The undertaker must ensure that any coatings and treatments are suitable for use in the marine environment and are used in accordance with guidelines approved by the Health and Safety Executive or the Environment Agency pollution prevention guidelines. Any spillages must be reported to the MMO Marine Pollution Response Team within the timeframes specified in the marine pollution contingency plan.
(3) The undertaker must ensure that no waste concrete slurry or wash water from concrete or cement works is discharged into the marine environment and that concrete and cement mixing and washing areas are contained to prevent run-off entering the water through the freeing ports.
(4) 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.
(5) The undertaker must ensure that any oil, fuel or chemical spill within the marine environment is reported to the MMO Marine Pollution Response Team within the timeframe specified in the marine pollution contingency plan.
(6) 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.
(7) 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 drill arisings must be obtained before the drilling commences, which may also require a marine licence.
(8) The undertaker must ensure that any debris arising from the construction of the authorised scheme or temporary works placed seaward MHWS are removed on completion of the authorised scheme.
(9) The management of chemicals, drilling and control of debris referred to in sub-paragraphs (2) to (8) must be managed in accordance with the chemical risk assessment and the marine pollution contingency plan.
(10) At least 10 days before commencement of the licensed activities, the undertaker must submit to the MMO an audit sheet covering all aspects of the construction of the licensed activities or any phase of them. The audit sheet must include details of—
(a) loading facilities;
(b) vessels;
(c) equipment;
(d) shipment routes;
(e) transport;
(f) working schedules; and
(g) all components and materials to be used in the construction of the authorised scheme.
(11) The audit sheet must be maintained throughout the construction of the authorised scheme (or relevant phase) and must be submitted to the MMO for review at fortnightly intervals during periods of active offshore construction.
(12) In the event that the MMO becomes aware that any of the materials on the audit sheet cannot be accounted for, it must require the undertaker to carry out a side-scan sonar survey to plot all obstructions across a reasonable area of search agreed by the MMO where construction works and related activities have been carried out. Local commercial fishing groups must be invited to send a representative to be present during the survey. Any obstructions that the MMO believes to be associated with the authorised scheme must be removed at the undertaker’s expense.
(13) As an alternative to the completion of an audit sheet, with written approval from the MMO, the Undertaker may introduce a dropped object procedure. If a dropped object procedure is introduced, any dropped objects must be reported to the MMO using the dropped object procedure form within 6 hours of the undertaker becoming aware of an 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), and the MMO may require obstructions to be removed from the seabed at the undertaker’s expense.
(14) The undertaker must agree with the MMO, before commencement of works, whether the dropped object procedure or audit sheet is to be used.

12 Force majeure
If, due to stress of weather or any other cause, the master of a vessel determines that it is necessary to deposit the authorised deposits otherwise than in accordance with Condition 14(2) because the safety of human life or of the vessel is threatened—
(a) full details of the circumstances of the deposit must be notified to the MMO within 48 hours; and
(b) at the reasonable request of the MMO, the unauthorised deposits must be removed at the undertaker’s expense.

Pre-construction plans and documentation
13 The licensed activities or any phase of those activities must not commence until the following (insofar as relevant to that activity or phase of activity) have been submitted to and approved in writing by the MMO—

Cable specification and installation plan
(a) a cable specification and installation plan to be agreed in consultation with Trinity House and the MCA that shows the route of the cable to ensure conformity with the description of Work Nos. 2A and 3A. The plan must include the co-ordinates of the transmission works within Work Nos. 1A, 2A and 3A;

Detailed construction and monitoring programme
(b) a detailed construction and monitoring programme, including details of—
(i) the proposed construction commencement date;
(ii) proposed timings for mobilisation of plant, delivery of materials and installation works; and
(iii) proposed pre-construction surveys, a proposed format and content for a baseline report, construction monitoring, post-construction monitoring and related reporting in consultation with the relevant statutory nature conservation body. The pre-construction survey programme and all pre-construction survey methodologies must be submitted to the MMO for written approval at least 4 months before commencement of any survey works detailed within;

Construction method statement
(c) a construction method statement in accordance with the construction methods assessed in the environmental statement, including details of—
(i) drilling methods and arrangements for disposal of drill arisings, in accordance with the disposal scenario statement;
(ii) platform location and installation, including, scour protection and foundations which must be those that are able to be completely and safely removed, or reduced to a level below the seabed, at the time of decommissioning;
(iii) cable installation;
(iv) cable installation between MHWS and MLWS;
(v) impact piling soft start procedures;
(vi) the source of rock material used in construction and method to minimise contaminants and fines;
(vii) contractors;
(viii) vessels;
(ix) associated works;
(x) foundation scour protection requirements in a plan produced following pre-construction surveys identifying where scour protection is most likely to be required (an “intelligent scour protection management plan”); and
(xi) details of notification of the closure of the disposal site (reference number DG030) on completion of disposal activities;

Project environmental management and monitoring plan
(d) a project environmental management and monitoring plan that details minimum environmental management requirements expected of all contractors and subcontractors, with regards to marine pollution contingency, waste management and disposal, chemical risk assessment and relevant fisheries liaison matters, including details of—
(i) a marine pollution contingency plan to address the risks, methods and procedures to deal with any spills and collision incidents during construction and operation of the authorised scheme in relation to all activities carried out;
(ii) a chemical risk assessment, including information regarding how and when chemicals are to be used, stored and transported in accordance with recognised best practice guidance;
(iii) waste management and disposal arrangements;
(iv) the fisheries liaison officer, being a person appointed by the undertaker and charged with communication and liaison with the fishing industry as appropriate through the lifetime of the authorised scheme, to be notified to the marine officer for the MMO’s Northern Marine Area and the MMO Marine Licensing Team. Evidence of liaison must be collated so that signatures of attendance at meetings, agenda and minutes of meetings with the fishing industry can be provided to the MMO if requested; and
(v) a fisheries liaison plan in accordance with the draft fisheries liaison plan, including information on liaison with the fishing industry (including the fisheries liaison officer referred to in paragraph (iv)) and a co-existence plan that details how the project will be constructed and operated taking account of the fisheries industry;

Marine mammal mitigation protocol
(e) a marine mammal mitigation protocol with appropriate monitoring surveys in accordance with the offshore in principle monitoring plan, to be agreed in writing by the MMO in consultation with the relevant statutory nature conservation body and the Royal Society of Wildlife Trusts, the intention of which is to prevent, amongst other things,—
(i) injury to marine mammals, primarily auditory injury in the vicinity of any piling;
(ii) disturbance to marine mammals;
(iii) adversely affecting the integrity, within the meaning of the Offshore Marine Conservation (Natural Habitats, &c.) Regulations 2007, of a European offshore marine site or a European site (defined in regulations 15 and 24 of those Regulations respectively), to the extent that marine mammals are a protected feature of that site;

Cable specification and installation plan
(f) a cable specification and installation plan, following consultation with the relevant statutory nature conservation body, including—
(i) technical specification of offshore cables, including a desk-based assessment of attenuation of electro-magnetic field strengths, shielding and cable burial depth in accordance with industry good practice;
(ii) a staged cable-laying plan for the Order limits, incorporating a burial risk assessment to ascertain suitable burial depths and cable-laying techniques;
(iii) a cable protection plan providing details of the need, type, sources, quality and installation methods for cable protection; and
(iv) details of the methodology and extent of a post-lay survey to confirm burial depths;

Offshore archaeological written scheme of investigation
(g) an offshore archaeological written scheme of investigation in relation to the offshore areas within the Order limits in accordance with the outline offshore archaeological written scheme of investigation, industry good practice and in consultation with English Heritage, including—
(i) details of responsibilities of the undertaker, archaeological consultant and contractor inclusive of an agreed programme for the publication of results;
(ii) a methodology for any further site investigation including any specifications for geophysical, geotechnical and diver- or remotely-operated vehicle investigations;
(iii) within 3 months of any survey being completed, a timetable to be submitted to the MMO setting out the timeframe for the analysis and reporting of survey data;
(iv) delivery of any mitigation including, where necessary, archaeological exclusion zones;
(v) monitoring during and post-construction, including a conservation programme for finds;
(vi) archiving of archaeological material, including ensuring that a copy of any agreed archaeological report is deposited with the English Heritage archive by submitting an English Heritage OASIS form with a digital copy of the report; and
(vii) a reporting and recording protocol, including reporting of any wreck or wreck material during construction, operation and decommissioning of the authorised scheme;

Aids to navigation management plan
(h) an aids to navigation management plan to be agreed in writing by the MMO following consultation with Trinity House and the MCA specifying—
(i) the aids to navigation to be established from the commencement of the authorised scheme to the completion of decommissioning;
(ii) the monitoring and reporting of the availability of aids to navigation; and
(iii) notifications and procedures for ensuring navigational safety following failures to aids to navigation;

Cofferdam method statement
(i) in the event that a temporary cofferdam is constructed in Work No. 3A, a cofferdam method statement for the monitoring and redistribution of sediment, to be agreed in writing by the MMO. The cofferdam method statement must include details of the installation and management of the temporary cofferdam.
14 (1) Each programme, statement, plan, protocol, scheme or details required to be approved under Condition 13 must be submitted for approval at least 4 months before the intended commencement of construction, except where otherwise stated or unless otherwise agreed in writing by the MMO.
(2) The licensed activities must be carried out in accordance with the programmes, statements, plans, protocols, schemes and details approved under Condition 13.

15 Offshore safety management
(1) Offshore works must not commence until the MMO, in consultation with the MCA,—
(a) has given written approval for an emergency response and co-operation plan (“ERCoP”) that includes full details of the emergency response procedures for the construction, operation and decommissioning phases of the authorised scheme in accordance with the MCA recommendations contained in the OREI guidance; and
(b) has confirmed in writing that the undertaker has taken into account and adequately addressed all MCA recommendations contained in the OREI guidance that are appropriate to the authorised scheme.
(2) The ERCoP must include the identification of a point of contact for emergency response.
(3) The ERCoP must be implemented as approved.
(4) In this Condition, “OREI guidance” means MCA document MGN371 “Offshore Renewable Energy Installations (OREIs) – Guidance on UK Navigational Practice, Safety and Emergency Response Issues” and its annexes.

16 Reporting of engaged agents, contractors and vessels
(1) The undertaker must provide the name and function of any agent or contractor appointed to engage in the licensed activities to the MMO at least 2 weeks before agents, contractors and vessels carry out licensed activities.
(2) Each week during the construction of the authorised scheme a completed Hydrographic Note H102 must be provided to the MMO listing the vessels currently and to be used in relation to the licensed activities.
(3) Any changes to the supplied details must be notified to the MMO in writing before the agent, contractor or vessel engages in the licensed activities.

17 Equipment and operation of vessels engaged in licensed activities
(1) All vessels employed to perform the licensed activities must be constructed and equipped to be capable of the proper performance of such activities in accordance with the Conditions and (except in the case of remotely-operated vehicles or vessels) must comply with sub-paragraphs (2) to (5).
(2) All motor-powered vessels must be fitted with—
(a) an electronic positioning aid to provide navigational data;
(b) radar;
(c) an echo-sounder; and
(d) multi-channel VHF.
(3) All vessels’ names or identification must be clearly marked on the hull or superstructure.
(4) All communication on VHF working frequencies must be in English.
(5) No vessel may engage in the licensed activities until all the equipment specified in sub-paragraph (2) is fully operational.

18 Pre-construction monitoring
(1) The undertaker must, in discharging Condition 13(b), and the requirement to prepare a detailed construction and monitoring programme, include details for written approval by the MMO of proposed pre-construction surveys, including methodologies and timings, and a proposed format and content for a pre-construction baseline report. The survey proposals must be in accordance with the principles set out in the offshore in principle monitoring plan and must specify each survey’s objectives and explain how it assists in either informing a useful and valid comparison with the post-construction position or enables the validation or otherwise of key predictions in the environmental statement. The baseline report proposals must ensure that the outcome of the agreed surveys together with existing data and reports are drawn together to present a valid statement of the pre-construction position, with any limitations, and must make clear what post-construction comparison is intended and the justification for this being required.
(2) Subject to receipt from the undertaker of specific proposals pursuant to this Condition, where appropriate and necessary it is expected that the pre-construction surveys will comprise—
(a) an appropriate survey to determine the location and reasonable extent of any benthic habitats of conservation, ecological or economic importance (including Annex 1 habitats) in whole or in part inside the areas within the Order limits in which it is proposed to carry out construction works; and
(b) appropriate high-resolution bathymetric surveys undertaken to International Hydrographic Organisation Order IA standard and side-scan surveys of the areas within Work Nos. 1A and 2A within the Order limits in which it is proposed to carry out construction works. This must include the identification of sites of historic or archaeological interest (A1 and A3 receptors) and any unidentified anomalies larger than 5 metres in diameter (A2 receptors), which may require the refinement, removal or introduction of archaeological exclusion zones and to confirm project-specific micro-siting requirements (for A2 receptors).
(3) The undertaker must carry out and complete the surveys to be undertaken under sub-paragraph (1) in a timescale agreed by the MMO.

19 Construction monitoring
(1) The undertaker must, in discharging Condition 13(b), submit details for approval by the MMO of any proposed surveys or monitoring, including methodologies and timings, to be carried out during the construction of the authorised scheme.
(2) The detailed construction and monitoring programme referred to in Condition 13(b) must be submitted at least 4 months before commencement of any survey works and provide the agreed reports in the agreed format in accordance with the agreed timetable. The survey proposals must be in accordance with the principles set out in the offshore in principle monitoring plan and must specify each survey’s objectives.
(3) The construction surveys must, where driven or part-driven pile foundations (for each specific foundation type) are proposed to be used, comprise measurements of noise generated by the installation of 1 pile from each of the first 4 structures with piled foundations, following which the MMO must determine whether further noise monitoring is required. The results of the initial noise measurements must be provided to the MMO within 6 weeks of the installation of the first relevant foundation piece. The assessment of this report by the MMO must determine whether any further noise monitoring is required.
(4) The undertaker must carry out and complete the surveys to be undertaken under sub-paragraph (1) in a timescale agreed by the MMO.

20 Post-construction surveys
(1) The undertaker must, in discharging Condition 13(b), submit details for written approval by the MMO of the 3 post-construction surveys proposed in sub-paragraph (2), including methodologies and timings, and a proposed format, content and timings for providing reports on the results at least 4 months before commencement of any survey works detailed within. The survey proposals must be in accordance with the principles set out in the offshore in principle monitoring plan and specify each survey’s objectives and explain how it assists in either informing a useful and valid comparison with the pre-construction position or enables the validation or otherwise of key predictions in the environmental statement.
(2) Subject to receipt of specific proposals, it is expected that the post-construction surveys will comprise—
(a) appropriate high-resolution bathymetric surveys undertaken to International Hydrographic Organisation Order IA standard and side-scan sonar surveys around a sample of infrastructure locations that are considered appropriate to assess any changes in seabed topography. For this purpose, the undertaker must before the first survey submit a desk-based assessment (that takes into account all factors that influence scour) to identify the sample of infrastructure locations that are considered appropriate with greatest potential for scour. The survey must be used to validate the desk-based assessment. Further surveys may be required if there are significant differences between the modelled scour and recorded scour;
(b) dependent on the outcome of the surveys undertaken under Condition 18(2)(a), appropriate surveys to determine the effects of construction activity on any benthic habitats of conservation, ecological or economic importance (including Annex 1 habitats) in whole or in part inside the areas within the Order limits to validate predictions made in the environmental statement and to identify the presence of any non-native species and wider community type structure; and
(c) appropriate surveys to determine change in size and form of the drill disposal mounds over the lifetime of the authorised scheme.
(3) The undertaker must carry out the surveys under sub-paragraph (1) and provide the reports in the agreed format in accordance with the timetable agreed in writing by the MMO following consultation with the relevant statutory nature conservation body.

21 Offshore maintenance plan
(1) The undertaker must, at least 4 months before commissioning the licenced activities, submit for written approval by the MMO an offshore maintenance plan based on the maintenance assessed in accordance with the environmental statement in the outline offshore maintenance plan.
(2) An update to the offshore maintenance plan must be submitted for approval every 3 years, or sooner in the event of any proposed major revision to planned maintenance activities or the adoption of any new technologies or techniques applicable to programmed maintenance
(3) Maintenance must be carried out in accordance with the approved offshore maintenance plan.

Aids to navigation
22 The undertaker must during the whole period of the construction, operation, alteration, replacement or decommissioning of the authorised scheme exhibit such lights, marks, sounds, signals and other aids to navigation, and take such other steps for the prevention of danger to navigation, as directed by Trinity House.
23 The undertaker must submit reports quarterly to Trinity House detailing the working condition of aids to navigation. Reports may be requested more frequently by Trinity House, and must be submitted by the undertaker as requested.
24 The undertaker must notify Trinity House and the MMO of any failure of aids to navigation as soon as possible and no later than 24 hours following the detection of the failure.
25 Following notification of a failure of aids to navigation, the undertaker must as soon as practicable notify Trinity House and the MMO of a timescale and plan for remedying the failure.
26 The undertaker must paint all structures that are part of the authorised scheme yellow (colour code RAL 1023) from at least HAT to a height as directed by Trinity House.
27 In case of damage to, or destruction or decay of, the authorised scheme or any part of it, the undertaker must as soon as possible and no later than 24 hours following the identification of damage, destruction or decay, notify Trinity House and the MMO.
28 The undertaker must lay down such buoys, exhibit such lights and take such other steps for preventing danger to navigation as directed by Trinity House.

29 Progress of authorised scheme
The undertaker must keep Trinity House, the MCA and the MMO informed of progress of the authorised scheme including—
(a) notice of commencement of construction of the authorised scheme within 24 hours of commencement having occurred;
(b) notice within 24 hours of any aids to navigation being established by the undertaker; and
(c) notice within 5 working days of completion of construction of the authorised scheme.

30 Amendments to plans, etc.
Where any Condition requires licensed activities to be carried out in accordance with any programme, statement, plan, protocol, scheme, details or arrangements approved by the MMO, the approved programme, statement, plan, protocol, scheme, details or arrangements must be taken to include any amendments that may subsequently be approved in writing by the MMO (after consulting any person that the MMO is required to consult under the relevant Condition).