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

7.3.6 Impact Description and Significance: Construction
Impact Description
With regard to air quality, there are no specific positive impacts relating to the
construction of the proposed project.
The negative impacts identified due to air borne emissions at the Project site
are primarily relate to some PM 10 and NO 2 / NO x contributions from vehicles
used during construction and emissions of dust arising from construction
activities at the site
Construction vehicles will include heavy vehicles used for transporting raw
materials and equipment, plant for levelling of the site and assistance with
clearance of vegetation and smaller vehicles for staff.
The potential for dust nuisance is unlikely at locations between 200 m and 500
m, except in the most extreme wind conditions. In addition, wind speeds of
0.2 mm/hour will effectively
attenuate dust. The latter is particularly pertinent as 50 percent of the
proposed construction programme is likely to occur in the rainy season.
A review of receptor locations identified (local communities of Orior-
Osemwende, Ihovbor-Evboeka and Idunmwowina-Urho-Nisen), that lie
within 500 m of the site, indicate that there are three communities (including a
primary school within 500 m) surrounding the site to the north and to the
south and east. There are a small number of receptors (13) within the
community of Orior-Osemwende and four farms so the south of Orior-
Osemwende within 200 m of the site boundary.
Meteorological data for 1994 have been used to assess the dust conditions, the
results of which are set out in Table 1.7. The table sets out the percentage of
the year when the wind speed and precipitation are sufficient to generate
dust, and the direction towards which the wind is blowing.
Table 7.10 Summary of Dust Generating Conditions and Migration, 1994
Wind direction (wind blowing from)
Number of hours per year
with wind speed >5.3m/s and
precipitation ≤ 0.2 mm/hour Percentage of year
East 26 0.3
North 19 0.2
South 485 5.5
Southeast 56 0.6
Southwest 304 3.5
West 20 0.2
Weather conditions unlikely to result in dust being generated 89.2
AZURA EDO IPP
7-23
DRAFT EIA REPORT