Environmental Assessment
Volume C-4.3
Slurry Pipeline
Fish and Aquatic Resources
Ambatovy Project
136
January 2006
Table 4.3-8 Residual Impact Classification for Effects on Aquatic Habitat
Phase
Direction Magnitude Geographic
Extent
Duration Reversibility Frequency Environmental
Consequence
Effect: Aquatic Habitat Disturbance by Slurry Pipeline
construction negative
low
local
short-
term
no
high
low
operations
negative
low
local
long-
term
no
high
low
Effect: Downstream Water Quality (TSS) Changes
construction negative
high
local
short-
term
yes
high
moderate /
unknown
operations
negative
low
local
medium-
term
yes
high
low / unknown
closure
negative
low
local
long-
term
yes
high
low / unknown
Effect: Aquatic Habitat Disturbance and Water Quality Changes from Infrastructure and Access / Service
Roads
construction negative
low
local
short-
term
no/ yes
(water
quality)
high
low / unknown
operations
negative
low
local
long-
term
no / yes
(water
quality)
high
low / unknown
Effect: Aquatic Habitat Reclamation
closure
positive
n/a
n/a
n/a
n/a
n/a
n/a
n/a = Criteria not classified for positive impacts.
Monitoring
Construction, operation and post-disturbance monitoring of the effectiveness and
integrity of mitigation and site reclamation will be implemented to ensure
protection of the downstream resources.
4.3.6
Key Question FA-2: What Effect Will the Project Have
on the Abundance and Survival of Fish?
4.3.6.1 Impact Pathways
The abundance and survival of fish and other aquatic biota can be affected by
activities during construction, operation and closure phases. Changes will result
primarily from:
•
community (habitat) modification; and
