7.1.1.1 The EIA has recommended that the EM&A for cultural heritage resources is undertaken during the construction phase of the project. Implementation of the mitigation measures recommended by the EIA will be monitored through the site audit programme.
7.2.1.1
Mitigation measures have been
recommended for the protection of six built heritage resources NP-10, NP-11,
NP-19, NP-20, NP-21 and NP-26, as shown in Figures 7.1, 7.2 and 7.3, which may be damaged by the proposed construction works and the
mitigation measures for each resource have
been recommended. The
recommended mitigation measures are summarised in the Environmental Mitigation
Implementation Schedule provided in Appendix A and detailed below:
i) For heritage resources in close proximity to a works area (NP-19, NP-20, NP-21 and NP-26), a buffer zone of a minimum of 5 metres in size (or if due to site/engineering constraints, as large as possible buffer zone should be provided) should be marked out by temporary fencing and placed around the structures 2 weeks prior to the construction works commencing;
ii)
For heritage resources in close
proximity to an excavation area that may be affected by ground borne vibration (NP-10,
NP-11 and NP-19), a condition survey must be carried out by a qualified
building surveyor or engineer one month in advance of works commencing near the
buildings.
iii)
Vibration monitoring should be
undertaken for the duration of the construction works based upon the
recommendations of the approved Condition Survey Report for NP-10, NP-11 and
NP-19), which will also define the frequency of monitoring required. The maximum acceptable level of vibration
will be set at 15 mm/s. Based upon the findings of the condition survey, this limit may be revised for sensitive structures.
7.3.1.1 Baseline monitoring for the cultural heritage resources will comprise a pre-construction condition survey of three village houses to establish the existing condition. The Condition Survey Report should contain descriptions of the structure, identification of fragile elements, an appraisal of the condition and working methods for any proposed monitoring (including frequency of monitoring) and precautionary measures that are recommended. The main aim of the survey is prevention of any possible damage before and during the engineering works. The Contractor must implement the approved monitoring and precautionary measures.
7.4.1.1
All
measures undertaken by the Contractor during the construction phase in the
vicinity of the six heritage resources shall be audited by a qualified building
surveyor, as a member of the Environmental Team (ET), on a monthly basis to
ensure compliance with the intended aims of the recommended mitigation
measures. The broad scope of the audit
will involve supervision of the following:
· non-contact effects of the engineering works, such as vibration from pneumatic drills which could cause damage, such as foundation or wall cracks and loosening of tiles or fixtures; and
· contact between the historic structures and equipment and materials associated with the engineering works.
7.4.1.2
Specifically
the monitoring programme will entail the following tasks:
· the extent of the agreed works areas should be regularly checked during the construction phase. Any trespass by the Contractor outside the limit of the works, including any works close to the historical buildings shall be noted;
· inspection of the surrounding area and ground around the structures to ensure that the foundations are not being undermined in any way; and
· ensure no stockpiling or equipment storage is affecting the structures.
7.4.1.3
In the
event of non compliance the responsibilities of the relevant parties is
detailed in the Event /Action plan provided on Table 7.1.
Table 7.1 Event / Action Plan
for Construction Phase for Heritage Issues
|
Action Level |
ET |
IEC |
ER |
Contractor |
|
Non-conformity on one
occasion |
1. Identify Source 2.
Inform the IEC and the ER 3. Discuss remedial actions with
the IEC, the ER and the Contractor 4. Monitor remedial actions
until rectification has been completed |
1. Check report 2.
Check the Contractor's
working method 3.
Discuss with the ES and the
Contractor on possible remedial measures 4.
Advise the ER on effectiveness of proposed remedial measures. 5.
Check implementation of remedial measures. |
1. Notify Contractor 2.
Ensure remedial measures are properly implemented |
1.
Amend working methods 2.
Rectify damage and undertake any necessary replacement |
|
Repeated Non-conformity |
1. Identify Source 2.
Inform the IEC and the ER 3.
Increase monitoring frequency 4.
Discuss remedial actions with the IEC, the ER and the Contractor 5. Monitor remedial actions
until rectification has been completed 6. If exceedance stops, cease
additional monitoring |
1. Check monitoring report 2. Check the Contractor's working method 3. Discuss with the ES and the Contractor on
possible remedial measures 4.
Advise the ER on effectiveness of proposed remedial measures 5. Supervise implementation of remedial
measures. |
1.
Notify
the Contractor 2.
Ensure
remedial measures are properly implemented |
1.
Amend working methods 2.
Rectify damage and undertake any necessary replacement |
Note: ET – Environmental Team, IEC – Independent Environmental
Checker, ER – Engineer’s Representative