Environmental Assessment
Volume B-3.5
Mine
Noise
Ambatovy Project
67
January 2006
Figure 3.5-1 Noise Impact Magnitude Decision Tree
Does the noise
contribution from
Ambatovy Project
exceed the nighttime
World Bank criteria?
No
Yes
Are baseline noise
levels above the
World Bank criteria?
Yes
No
Do baseline noise
levels increase by
more than 3 dBA?
No
Negligible
Yes
Do baseline noise
levels increase by
more than 6 dBA?
No
Yes
Moderate
High
No
Yes
Negligible
Low
Does the noise
contribution from the
project activities
exceed the daytime
World Bank criteria?
No
Yes
Moderate
High
Will the project result in
a noticable
( 3 dBA) change in
the baseline noise
levels?
3.5.4.4 Mitigation
Mitigation or noise controls considered in the mine site assessment are as
follows:
•
terrain acting as a natural barrier;
•
standard silencers on motorized equipment; and
•
buildings at the power plant and mill acting as barriers.
