3.         MONITORING RESULTS

 

Air Quality

 

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 during the reporting period. 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.

 

3.3               There was no AL level exceedance recorded in the reporting quarter.

 

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

Nov 07

Dec 07

Jan 08

1-hr TSP

No. of monitoring events

12

12

15

Action

0

0

0

Limit

0

0

0

Total

0

0

0

24-hr TSP

No. of monitoring events

4

5

4

Action

0

0

0

Limit

0

0

0

Total

0

0

0

 

Environmental Site Inspection

 

3.5               There were 14 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 during dumping activities, manual sorting of non-inert waste and dump truck traffic were 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 dumping activities, manual sorting of non-inert waste and dump truck traffic inside the CWSF. Mitigation measures, including operation of wheel-washing facilities had been implemented and the water sprinklers were installed and the haul road was sufficiently dampened.

 

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 C&D waste and chemical 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.