Air

Assessment Result

Construction Phase
Construction Dust
With the implementation of dust control measures recommended in the EIA Report and good construction site practices, adverse dust and air quality impacts are not anticipated.

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Air Sensitive Receivers

Operation Phase
Odour from Maintenance Dredging
The frequency and scale of maintenance dredging required along the river channel and the flood retardation pond is anticipated to be very small compared with the dredging works during the capital works. Hence, by adopting similar mitigation measures as in the construction stage, adverse odour impacts at the ASRs due to maintenance dredging are not expected. The dredged sediments will be disposed of by trucks or marine vessels at Shenzhen side and the number of truck trips or marine vessels generated will be minimal. With limited quantity of sediments dredged and the small number of truck trips at Shenzhen side or marine vessels generated in this Project, no adverse cumulative air quality impacts are anticipated at the identified ASRs.

Odour from Dredged Sediment
The level of acid volatile sulphide (AVS) in the river sediments of the Project site were analysed to identify the potential strenght from the dredged sediment. The AVS levels of the river sediments were compared with the sediment considered to have minimum odour impact (reference sediment). As the AVS levels in the sediment samples from the Project Site are significantly lower than that from the reference sediment. It is therefore expected that the potential odour emissons from the dredging and handling of river sediments would be minimal.

Dredged sediment placed on truck or marine vessel for disposal should be properly covered during transportation to minimize the potential odour. In the event that dredging material are found to be odorous, the odorous dredged sediment should be placed as far away from the identified ASRs as practically possible and should be removed off-site as soon as practicable to avoid any potential odour nuisance arising .

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Operation Phase
Odour from Maintenance Dredging
The volume of sediment to be dredged during the maintenance dredging will be significantly less than that of capital work dredging during the construction phase . Besides, the sediment quality will be improved after the completion of the dry weather flow interception as part of the Project. Hence, it is expected that the potential odour emissions from the dredging and handling of river sediments would be minimal.