9.1
Key Issues for the Coming Month
9.1.1
Works to be taken for the coming monitoring
period are described as follows:
i.
excavations;
ii.
slope formation and finishing works
iii.
traffic and utilities diversions;
iv.
booster pump house
v.
abutment construction;
vi.
pier/portal construction;
vii. deck
construction; and
viii. viaduct finishing.
9.1.2
Potential environmental impacts arising from the
above construction activities are mainly associated with dust, noise, site
run-off and waste. However, with the
implementation of the following mitigation measures, potential impacts to the
surrounding sensitive receivers could be minimized.
9.1.3
Construction Dust
i.
frequently watering of haul road and unpaved
areas;
ii.
prohibition of any open burning on site;
iii.
investigation of other dust sources near air
sensitive receivers;
iv.
regularly watering or covering of open areas and
stockpiles with tarpaulin sheeting;
v.
hydroseeding or covering inactive exposed soil
areas with impervious sheeting if necessary;
vi.
switching off vehicles and equipments while not
in use; and
vii. regular maintenance of onsite machinery and vehicles.
9.1.4
Construction Noise
i.
identification of noise sources arising within
and outside work site; and
ii.
follow-up of any exceedance caused by the construction works.
9.1.5
Construction Run-off
i.
identification of sources of run-off from site;
ii.
provision of sandbags/bunds/surface channels to
direct run-off to silt/sand removal facilities;
iii.
avoidance of direct discharge of construction
wastewater into storm water drainage;
iv.
provision of adequate treatment of construction
wastewater and run-off prior to discharge; and
v.
covering of exposed
slope with tarpaulin or similar means during rainstorm.
9.1.6
Construction Waste Management
i.
avoidance of accumulation of construction waste
materials and/or general refuse on site;
ii.
segregation of waste;
iii.
collection of chemical waste or oil and disposal
of as chemical waste in accordance with the relevant regulations; and
iv.
regularly removing of
waste materials on site.
9.2
Monitoring Schedule for the
Coming Three Months
9.2.1
The tentative schedules for dust and noise
monitoring for the next three months are attached in Appendix
P.