Azura-Edo Independent Power Plant Environmental Impact ... - IFC

impacts exactly or take account of the duration of such works to determine
significance.
Although construction noise may be noticeable during civil works such as site
clearance, or the use of jackhammers, pile drivers and the like. However, due
to the overall types of activity and distance between main work sites and
nearest sensitive receptors, there is a low likelihood of the noise levels
exceeding 70 dB LAeq, 1hr and if so, this will be of short duration. The negative
noise impacts are therefore considered to be of negligible significance at the
nearest receptors.
7.4.4 Impact Description and Significance: Operational
Impact Description
With regard to noise emissions, there are no specific positive impacts relating
to the operation of the proposed project.
Noise during operation is expected to be generated by various components of
the Azura Edo IPP, including the gas turbines and associated fin-fan coolers
and bag filter houses, the high-voltage and power station transformers and
switchyard, the black-start diesel generators, the turbine hall, the workshops
and ancillary facilities such as the water treatment plants and the
administration buildings.
The noise levels from each of these components and sources were modelled to
be able to understand the combined noise emissions from the operations and
therefore present a reasonable worst case scenario. Operational noise has
been modelled based on the assumptions and the proposed design of the
Azura Edo IPP, according to the design specifications of the proposed plant to
meet 45 dB(A) at 300m from the plant boundary. This specification was used
to determine input source noise levels in terms of sound power and was used
to calculate the predicted noise levels. Potential noise impacts from the Project
at the nearest noise sensitive properties are therefore considered to be
representative of typical operations from the project.
Impact Significance
The results of the modeling indicate that operational noise levels from the
Azura Edo IPP will remain below the IFC Guideline Noise Levels, both during
the day and night at all receptors (Figure 7.6). According to the methodology
presented in Section 7.4.1, the overall noise impacts are therefore deemed to be
negative and of insignificant significance prior to mitigation.
7.4.5 Impact Description and Significance: Decommissioning
Impact Description
The decommissioning of the plant will take place in approximately 2035 and
take approximately 12 months. Much of the work will be broadly similar to
AZURA EDO IPP
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