Paragraph 7 Chemicals, drilling and debrisI1

Unless otherwise agreed in writing by the MMO, all chemicals used in the construction of the authorised scheme, including any chemical agents placed within any monopile void, shall be selected from the List of Notified Chemicals approved for use by the offshore oil and gas industry under the Offshore Chemicals Regulations 2002^f1 unless otherwise agreed in writing by the MMO.

Unless otherwise agreed in writing by the MMO, the undertaker shall ensure that any coatings and any treatments are suitable for use in the marine environment and are used in accordance with guidelines approved either by the Health and Safety Executive or by the Environment Agency Pollution Prevention Control Guidelines.

The storage, handling, transport and use of fuels, lubricants, chemicals and other substances shall be undertaken so as to prevent releases into the marine environment, including bunding of 110% of the total volume of all reservoirs and containers.

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 shall be obtained before the drilling commences, which may also require a marine licence.

The undertaker shall ensure that any debris arising from the construction of the authorised scheme or temporary works placed below MHWS are removed on completion of the authorised scheme.

At least two months prior to the 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 part of them. The audit sheet shall include details of—

No licensed activities shall commence until the MMO has approved the audit sheet in writing.

The audit sheet shall be maintained throughout the construction of the authorised scheme (or relevant part) and any changes notified immediately in writing to the MMO which must give written approval prior to any change being implemented.

In the event that the MMO becomes aware that any of the materials on the audit sheet cannot be accounted for it shall require the undertaker to carry out a side scan sonar survey to plot all obstructions across the relevant areas within the Order limits where the construction works and activities related to those materials have been carried out and, if the initial survey does not locate the missing materials, over such wider area as the MMO may reasonably request. Local fishermen shall 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 shall be removed at the undertaker’s expense.

The undertaker shall inform the MMO of the location and quantities of material disposed each month under this licence, by submission of a disposal return by 31 January each year for the months August to January inclusive, and by 31 July each year for the months February to July inclusive.

The undertaker shall ensure that only inert material of natural origin, produced during the drilling installation of monopiles or jacket pin foundations, and drilling mud shall be disposed of within the Order Limits. Any other materials shall be screened out before disposal at this site.