Temperature - European Investment Bank

WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD.
Mount Coffee HPP ESIA and RAP 2012-09-18
ESIA Report Page 143
Issue Project component Impact Mitigation measures Related Sub Monitoring and
Management Plans (S-MMP)
Water quality Reservoir Change from river to lake
ecosystem.
Water quality Construction
activities
Possible greenhouse gas emission
Increased load in suspended solids
stemming from the construction
site.
Contamination with concrete,
resulting in a higher pH which
could potentially be toxic for fish.
Contamination with hydrocarbons
(fuel, lubricants etc.) and other
toxic substances used on site.
Contamination with human waste
from the worker's camp.
Cutting of trees which can be used, either for timber or for producing
charcoal. The local population should be encouraged to use all timber
resources within the reservoir to the extent possible.
Cutting and burning of all trees which cannot be used, before
impoundment to reduce obstacles and dangers for boats and fishing
gear.
Shortly before impounding cutting of as much vegetation as possible,
and burning it.
In general all equipment, machinery, trucks and camp installations
have to be located in a distance of more than 250 m to water used for
human consumption and at least 150 m to any body of surface water.
Strict measures must be taken to prevent oil pollution of the river.
The most important are:
� Storage of fuel and lubricants away from the river, in tight
containers placed on sealed surfaces.
� Storage areas shall be designed such that they will contain 110
% of the largest container/ vessel stored in the storage area and
waterproof; have available on site equipment and materials to
execute clean-up (sufficient absorband).
� Good maintenance of vehicles and machines to prevent oil losses.
� No cleaning or maintenance of vehicles or machines in close
proximity to the river. This must be done on specially prepared
places (workshops) equipped with oil skimmers.
Unnecessary dangerous chemicals and/or toxic substances are
forbidden to use.
Do not install a deposit even for uncontaminated gravel from the
quarry near any body of surface water
All the water draining down from the quarry needs to be lead to
sedimentation and neutralisation tanks and has to be treated before
releasing it to the river.
All the waters from the batching plants, the concrete mixer washing
facilities and the crusher plants needs to be collected and treated
before releasing to the environment.
Waste water from the camp site must be collected in portable latrines
or septic tanks and has to be treated before releasing into a river.
Water Quality Management Plan during
operation
Waste Water Management Plan during
operation
Waste Management Plan during
Operation
EH&S Management and Monitoring of
the Contractor
Equipment Maintenance Management
Plan
Wastewater Management Plan
Waste Management Plan
Pollutant Spill Contingency Plan