Temperature - European Investment Bank

WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD.
Mount Coffee HPP ESIA and RAP 2012-09-18
ESIA Report Page 141
Table 20-1: Preliminary main project impacts and corresponding mitigation measures
Issue Project component Impact Mitigation measures Related Sub Monitoring and
Management Plans (S-MMP)
Physical Environment
Geology Dam and reservoir Not required No S-MMP
Soils Construction area,
quarries, burrows
and dumping areas
Soil erosion and land sliding Good engineering practices will help controlling soil erosion both at
construction sites and in peripheral areas, particularly in borrow and
dumping areas and along access roads. Following measures have
been mentioned:
� Install sediment traps
� Drainage channels where necessary
� Prevent steep slopes, define optimum height of work evaluating
the instability of the rock, soil etc.
� Stabilise, compact and strengthen steep slopes
� Adequate selection of road tracks, taking into account the
landscape, technical environmental and social aspects
� Construct drainage ditches at roads if there are pasing through
mountainious area If the slope is more that 16 % they have to be
paved
� install culverts with enough capacity for strong rains, drainage
pipes and channels have to be of an adequate size and should be
equipped with screens at entrance and exit points to reduce the
risk of clogging
� Re-vegetation
EH&S Management and Monitoring of
the Contractor
Erosion Management Plan