Dzhankeldy Wind Power Project

ADB
 AND 
EPFI’
S
 
IFC is likely to require adherence to WHO noise standards as detailed in World Bank EHS 
Guidelines (2007), which stipulate a maximum threshold of 70dB(A) at industrial or commercial 
receptors during daytime. 
Table 5-7 World Bank Ambient Noise Level Guidelines 
R
ECEPTOR
 
O
NE 
H
OUR 
LA
EQ 
(
D
BA) 
D
AYTIME 
(7
AM
-10
PM
) 
N
IGHT 
(10
PM
-7
AM
) 
Residential, Institutional, Educational 
55 
45 
Industrial, Commercial 
70 
70 
Guideline values are for noise levels measured out of doors. 
Source: World Bank Group EHS General Guidelines, 2007. 
These relates to receptors and not the plant boundary. Noise impacts should not exceed the 
levels presented above, or result in a maximum increase in background levels of 3 (dBA) at 
the nearest sensitive receptor location off-site. 
Furthermore, the following requirements have also been specified in the WBG EHS noise 
guidelines: 
 
No employee should be exposed to a noise level greater than 85dB (A) for 
duration of more than 8 hours per day without hearing protection. In addition, no 
unprotected ear should be exposed to a peak sound pressure level 
(instantaneous) of more than 140dB(C). 
 
The use of hearing protection should be enforced actively when the equivalent 
sound level over 8 hours reaches 85dB (A), the peak sound level reaches 140dB(C), 
or the average maximum sound level reaches 110dB (A). Hearing protective 
devices provided should be capable of reducing sound level at the ear to at least 
85dB (A). 

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Dzhankeldy 500MW Wind Farm 
ESIA Volume 2- Main Text, Tables & Figures 
134 
 
For every 3dB(A) increase in sound levels, the allowed exposure period or duration 
should be reduced by 50%.  
 
Where feasible, use of acoustic insulating materials isolations of the noise source 
and other engineering controls should be investigated and implemented prior to 
the issuance of hearing protection devices as the final control mechanism. 
 
Medical hearing checks on workers exposed to high noise levels should be 
performed periodically.