Environmental Assessment
Volume E-3.10
Tailings Facility
Water Quality
Ambatovy Project
137
January 2006
Table 3.10-4 Maximum Predicted Concentrations Above Baseline or South African
Guidelines (Operations and Post-Closure)
Operations Scenarios
Basin A
(A1 to A4)
Basin B
Basin C
Basin A
(A5 to A6)
Parameter
Wet
Dry
Wet
Dry
Wet
Dry
Wet
Dry
conductivity
-
√
-
-
-
√
-
√
nitrate (NO
3
)
-
√
-
-
-
√
-
-
calcium (Ca)
-
-
-
√
-
-
-
-
magnesium (Mg)
√
√
√
√
-
-
-
√
sulphate (SO
4
)
√
√
√
√
-
-
√
√
cobalt (Co)
-
√
-
-
-
-
-
-
copper (Cu)
-
●
-
-
-
●
-
-
iron (Fe)
-
√
-
-
-
√
-
-
manganese (Mn)
√
●
√
√
-
-
√
√
silicon (Si)
-
-
n/a
√
-
-
-
-
zinc (Zn)
-
-
●
●
-
-
-
-
Post-Closure Scenarios
Basin A
(A1 to A4)
Basin B
Basin C
Basin A
(A5 to A6)
Parameter
Wet
Dry
Wet
Dry
Wet
Dry
Wet
Dry
conductivity
-
√
-
√
-
√
-
√
nitrate (NO
3
)
-
√
-
√
-
√
-
√
magnesium (Mg)
√
√
√
√
-
-
-
-
sulphate (SO
4
)
√
√
√
√
√
√
√
√
cobalt (Co)
-
√
-
√
-
√
-
-
copper (Cu)
-
●
-
●
-
●
-
-
iron (Fe)
-
√
-
√
-
√
-
√
manganese (Mn)
√
●
√
√
√
√
√
√
Not above baseline (less than 10% difference between baseline and maximum predicted concentration or guideline
value).
√
Project-related changes in water quality concentrations are above baseline values by 10% or greater.
●
Project-related changes in water quality concentrations are above baseline values by 10% or greater and above
guideline.
n/a
Substance not modelled for this season because baseline data were not available.
