(3) The approved noise and vibration management scheme must be implemented before and
maintained during construction of the relevant stage of the connection works. (4) The construction works must be undertaken in accordance with the approved noise and
vibration management scheme.
Construction hours 23.—(1) Construction work for the connection works and any construction-related traffic
movements to or from the site of the connection works shall not take place other than between 0700 hours and 1900 hours Monday to Saturday, with no activity on Sundays or bank holidays, save—
(a) where continuous periods of operation are required as assessed in the environmental statement, such as concrete pouring and directional drilling (subject to sub-paragraphs (3) and (4));
(b) for internal fitting out works associated with the onshore converter station comprised within Work No. 39;
(c) for the delivery of abnormal loads to the connection works, which may cause congestion on the local road network; and
(d) where connection works are being carried out on the foreshore. (2) All construction operations which are to be undertaken outside the hours specified in sub-
paragraph (1) must be agreed with the relevant planning authority in writing in advance, and must be carried out within the agreed times.
(3) Construction of Work No. 21 shall not take place other than between 0700 hours and 1900
hours Monday to Saturday, with no activity on Sunday or bank holidays. (4) Construction of Work No. 26 shall not take place other than between 0700 hours and 1900
hours Monday to Friday and 0700 hours and 1400 hours on Saturday, with no activity on Sunday or bank holidays.
Control of noise during operational phase 24.—(1) No part of Work No. 39 will commence until written details that provide for the
insulation of the onshore converter station against the transmission of noise and vibration have been submitted to and approved in writing by the relevant planning authority. Work No. 39 must thereafter be implemented in accordance with the approved details. The rating level of operational noise immissions (including any relevant penalties for tonal or impulsive noise in accordance with section 8 of BS4142:1997) from Work No. 39 (including transformers, air handling units and cooling fans) shall not exceed 35 dB LAeq, 5 min at Bullenhall Farm (610287, 246601) Hill Farm (609088, 245652) and Woodlands Farm (609597, 246806).
(2) Within three months of the completion of commissioning of Work 39, the undertaker shall
submit measurements to the relevant planning authority taken in the vicinity of the relevant property or properties specified at sub-paragraph (1) to confirm the rating level of operational noise immissions do not exceed 35 dB LAeq, 5 min, including details of any remedial works and a programme of implementation should the immissions exceed the stated levels.
(3) Measurements shall be undertaken in accordance with the equipment specifications,
measurement procedures and monitoring equipment positioning guidelines outlined in sections 4, 5 and 6 of BS 4142:1997.
(4) For the purposes of this requirement, “completion of commissioning” means the date when
the circuits have been fully tested and verified that they are able to transmit their rated power capacity to the grid connection point and National Grid has issued an FON (final operation notification) to the generator.
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