3.1
Air quality monitoring, including
1-hr and 24-hr TSP, was conducted three times a week and once a week
respectively, in accordance with the EM&A Manual.
3.2
The weather was generally dry and
windy from February 2007 to March 2007 and gradually become wet in April 2007.
The monitoring data and trend of air quality for the reporting quarter are
given in Appendix E. Major dust sources of the temporary CWSF were dump truck
traffic, dumping and sorting activities inside the CWSF. Other dust sources were
the dump truck traffic inside and outside of the Fill Bank and the dumping
activities inside the adjacent CWSF.
3.3
There were two limit level exceedances
of 24-hr TSP recorded in the reporting quarter. One additional monitoring was
conducted in the reporting quarter. All exceedances
were considered related to the Project.
3.4
Table 3.1 presents the number of exceedances
recorded in each month of the reporting quarter. The number of monitoring
events included regular monitoring events and additional ones, if any.
Table 3.1 Summary of Number of Exceedances for 1-hr
& 24-hr TSP Concentration
|
Monitoring
Parameter |
Level
of Exceedance |
Month |
||
|
Feb
07 |
Mar
07 |
Apr
07 |
||
|
1-hr
TSP |
No.
of monitoring events |
15 |
12 |
12 |
|
Action |
0 |
0 |
0 |
|
|
Limit |
0 |
0 |
0 |
|
|
Total |
0 |
0 |
0 |
|
|
24-hr
TSP |
No.
of monitoring events |
5 |
4 |
6 |
|
Action |
0 |
0 |
0 |
|
|
Limit |
1 |
0 |
1 |
|
|
Total |
1 |
0 |
1 |
|
3.5
There were 13 site inspections
conducted in the reporting quarter to monitor the implementation of proper
environmental pollution control and mitigation measures for the Project. The
major concerns for the Project are air quality and waste management on site. Dust
emission along haul roads and during earth movement was observed during site
inspections, while general refuse and chemicals were observed without proper
collection.
3.6
The implementation status of
environmental mitigation measures are given in Appendix D.
3.7
Major dust sources in the temporary
CWSF would be the manual sorting of non-inert waste, dumping activities and
dump truck traffic inside the CWSF. Although mitigation measures, including
dampening of haul roads and operation of wheel-washing facilities, had been
implemented, the Contractor was still advised to provide sufficient water
spraying during manual sorting of non-inert waste at Area A.
3.8
Besides the afore-said issues, the
Contractor was reminded to maintain the drainage systems regularly. It was
recommended to arrange additional maintenance for the silt trap at the wheel
washing bay and oil interceptor pump pit before and after rainstorms so as to
ensure their maximum treatment capacities.
3.9
The Contractor had obtained the
effluent discharge license on 13 November 2006.
Advice on Solid and Liquid Waste
Management Status
3.10
There was disposal of inert C&D
materials and C&D waste in the reporting quarter.
3.11
The Contractor was advised to
provide drip trays to all chemicals containers and implement sufficient
preventive measures, including placing tarpaulin sheets or drip tray on ground,
during equipment maintenance works to avoid oil leakage on the ground. In the
event of oil leakage, the Contractor should clean up the polluted soil and
dispose of as chemical waste.