Environmental Assessment
Volume E-3.9
Tailings Facility
Oceanography
Ambatovy Project
95
January 2006
Table 3.9-1 Suggested target values for the natural marine environment, which
should be used as a monitoring guideline.
Parameter
Recommended
target values
within
acceptable
variations
Unit
Effluent
to Ocean
Worst Case
Seawater
Compo-
sition 1
Malagasy
Limit 2
World
Bank
General
1998
Primary
Producers
Primary
Consumers
Secondary
Consumers
pH
7.3 – 8.5
7 - 8
6 - 9
6 - 9
X
Conductivity
200
uS/cm
200
Hardness
-
180
Temperature
+ or – 10C
0C
25
30
TSS
Not increase by
10% above
ambient
conditions
mg/L
100
60
50
X
Salinty
33 -36
ppt
-
35
-
-
X
X
Al
5
mg/L
<0.002
0.001
5
X
X
Sb
-
mg/L
<0.004
0.00033
As
0.036
mg/L
<0.0005
0.0026
0.5
0.1
X
X
Ba
100 – 550 ug/L –
Mussel embryos
mg/L
0.0025
0.021
X
Be
-
mg/L
<0.0025
0.0000006
Bi
-
mg/L
<0.0025
0.00002
B
-
mg/L
<0.0025
4.45
Cd
0.01
mg/L
<0.0005
0.00011
0.02
0.1
X
X
Ca
-
mg/L
225
411
Cl
-
mg/L
6
19400
Co
?
mg/L
0.03
0.00039
Cu
0.05
mg/L
0.0045
0.0009
0.5
X
X
CrT
0.08
mg/L
0.005
0.0002
2
0.5
X
X
F
-
mg/L
0.5
13
20
Fe
10
mg/L
<0.0015
0.0034
10
3.5
Pb
0.1
mg/L
<0.0025
0.00003
0.2
0.1
X
X
X
Li
-
mg/L
<0.0025
0.17
Mg
mg/L
1025
1290
Mn
-
mg/L
115
0.0004
5
Hg
0.0025
mg/L
<0.0005
0.00015
0.005
0.01
X
X
X
Mo
-
mg/L
0.001
0.01
Ni
0.25
mg/L
0.0415
0.0066
2
0.5
X
X
P
0.0001 – 0.001
mg/L
<0.015
0.088
2
K
-
mg/L
0.215
392
Sc
-
mg/L
5
<0.00000
4
Se
0.007
mg/L
0.005
0.02
0.1
X
X
Na
-
mg/L
2.5
10800
Si
-
mg/L
0.25
2.9
SO4
mg/L
4750
--
250
Te
-
mg/L
<0.05
--
Th
-
mg/L
V
0.001
mg/L
<0.001
0.0019
Zn
0.25
mg/L
<0.001
0.005
0.5
2
(a)
The table also indicates the trophic level most affected by changes in a particular constituent thus suitable as a monitoring indicator.
