10 RECOMMENDATIONS AND CONCLUSIONS
10.1.1
This Environmental Monitoring and Audit
(EM&A) report presents the EM&A works undertaken during the month from
10.1.2
A total of 54 sets of measurements for 1-hour
TSP and 18 sets for 24-hour TSP monitoring were carried out at three monitoring
locations during the reporting
period and the results of all measurements taken were below the A/L Levels.
10.1.3
A total of 12 sets of Leq(30min)
measurement in daytime (i.e. 0700 to 1900 hours on normal weekdays) were
carried out at three monitoring locations during the reporting period and no exceedances
were recorded.
10.1.4
A total of 4 sets of 6 x Leq(5min) measurements
in evening-time (i.e. 1900 to 2300 hours on normal weekdays) were carried out
at the closest monitoring locations, NSR 2, during the reporting period and no exceedances
were recorded.
10.1.5
A total of 4 sets of 4 x Leq(5min)
measurements were taken in night-time (i.e. 2300 to 0700 next day) at the
closest monitoring locations, NSR 2, during the reporting period and no exceedances
were recorded.
10.1.6
A total of 7 sets of 6 x Leq(5min)
measurements during public holidays (i.e. 0700 to 1900 hours during
public holiday) were carried out at three monitoring stations during the
reporting period and no exceedances were recorded.
10.1.7
No environmental complaints were received during
the reporting period.
10.1.8
No notifications of summons or prosecution were
received for this Contract since the commencement of construction.
10.1.9
ET and IEC audits were carried out in accordance
with the EM&A Manual and deficiencies identified were related to dust
control for open stockpiles and provision of wheel washing facilities at new
vehicular exit.
10.1.10No joint site inspections were carried out with EPD during the reporting period.
10.2.1 According to the environmental audits undertaken during the reporting period, the following recommendations have been made:
10.2.2 Construction Dust
i. better watering coverage should be provided at haul road and exposed areas to ensure the soil surface is in moist conditions;
ii. water or dust suppression chemical should be sprayed continuously on the surface where any pneumatic or power – driven drilling, cutting, polishing or other dust emissive mechanical breaking operations was undertaking; and
iii. open stockpiles of dusty material and demolished debris should be covered properly by tarpaulin or spray with water to keep surface moist.
10.2.3 Construction Noise
i. numbers / types of plant operating in the restricted hour should follow the condition of Construction Noise Permits;
ii. regular maintenance of machineries; and
iii. noisy equipment should be located away from nearby NSRs.
10.2.4 Water Quality
i. all construction wastewater and surface run-off should be diverted to appropriate water treatment facilities prior to discharge;
ii. de-silting facilities (sedimentation tanks/chemical treatment plants) should have adequate capacity for settling surface run-off;
iii. wheel washing facilities should be installed at all vehicular exits and used by all vehicles before leaving the construction site;
iv. surface run-off from the vehicular and plant servicing area should be diverted to the perimeter channels with petrol interceptor prior to discharge to storm drainage system;
v. site hoarding / concrete barriers should be tightly sealed at the bottom to prevent seepage of surface run-off from the site;
vi. accumulation of water in drip trays and at chemical/fuel storage area should be avoided; and
vii. complete temporary drainage systems on site in accordance with the approved Comprehensive Drainage Proposal.
10.2.5 Waste Management
i. oil / petrol contaminated soil should be collected and disposed of as chemical waste;
ii. all types of waste should be collected by licensed waste collectors; and
iii. good housekeeping should be implemented throughout the whole construction period.
10.2.6 Anti-mosquito breeding
i. pondings and uneven ground should be filled up and leveled;
ii. construction plant and other items which may retain water should be covered or treated in appropriate manner; and
iii.
all sedimentation
tanks, sump/soakaway pits and other receptacles which
may retain water should be sprayed with anti-mosquito repellent regularly.