Development of the Integrated Waste Management Facilities Phase 1

Proposal for Relocating Impact Water Monitoring Locations. Rev C

1. Introduction Rationale of Proposing for Relocating Water Monitoring Locations C1, C2 and S2

1.1 As existing monitoring locations C1, C2 and S2 are situated at fairway, see below Figure 1.1, performing water monitoring at such locations possesses marine safety problem, especially turbojet vessel passing through. Marine Department and other stakeholders had raised out safety concern on marine traffic near Adamasta Channel in the Marine Management Liaison Group (MMLG) Meeting held in September 2018. The vessel of the project shall strictly follow traffic separation schemes and not obstruct any major traffic streams where fairway along Adamasta Channel with daily 300-400 no. of High Speed Ferry transits.

1.2 In order to enhance the marine safety but without adversely affecting the quality and accuracy of water monitoring, we are proposing to relocate the water monitoring locations C1 to C1A, C2 to C2A and S2 to S2A.

Figure 1.1 - Existing monitoring locations and fairway

2. Requirement of Updating Water Monitoring Locations

2.1 According to EM&A Manual paragraph 4.3.1 of Water Quality Impact The proposed water quality monitoring stations for construction phase impact assessment are shown in Table 4.1 and Figure 4.1. The status and locations of water sensitive receivers and the marine activities may change after issuing this Manual. If such case exists, the ET Leader shall propose updated monitoring locations and seek approval from the IEC and EPD.

3. Water Monitoring Locations for the Project

3.1 Marine water quality monitoring stations have been proposed at different water quality sensitive receivers to monitor the water quality impact due to the proposed marine works under this Project.

3.2 Monitoring stations B1 to B4 would be located at 4 beaches respectively at the southern shore of Lantau Island.

3.3 Monitoring station H1 is located at the horseshoe crab habitat at northern SKC, while CR1 and CR2 are located at the coral communities at southwestern shore of SKC.

3.4 Monitoring station F1 is located at the Cheung Sha Wan Fish Culture Zone while monitoring station M1 is located at Tung Wan at Cheung Chau.

3.5 Water quality monitoring at the northern landing site, midway and southern landing site of the proposed submarine cable is proposed at monitoring stations S1, S2 and S3 for monitoring the SS impact due to the laying of submarine cable.

3.6 Control stations C1 and C2 have been proposed at far field locations for comparison.

3.7 Following tabulation summarizes the 14 nos. of monitoring stations for Marine Water Quality for Baseline and Impact Monitoring during Construction Phase

4. Considerations on Relocating C1, C2 and S2 to C1A, C2A and S2A 4.1 As explained in the introduction, the following factors have been considered in proposing the relocations.

i. Control Points C1A and C2A are kept in upstream of the construction site in ebb/flood condition (See Attachment No. 1);

ii. Control points C1A and C2A are kept sufficient distance as far-field from shore, construction site or any pollutant source (See Attachment No. 2);

Locations	Distance between Control Point & IWMF site boundary
C1	5 km
C1A	3 km
C2	3.4km
C2A	2.3km

iii. Control points C1A and C2A are kept similar tidal condition (See Attachment No. 1);

iv. S2A is relocated along same alignment and midway of landing site of the proposed submarine cable as S2

5. Coordinates of C1A, S2A and C2A

6. Conclusion

5.1 After relocation of the monitoring locations, marine safety could be enhanced due to monitoring work will be avoided nearby the fairways as in Figure 5.1.

5.2 The proposed relocation will not adversely affect the integrity of water quality monitoring programme.

Figure 5.1 - The original and proposed monitoring locations relocation and fairway

Attachment No. 1