Revision History

Revision Date	Revised for	Revision No.
14 Feb 2019	1st Issue	0
20 Feb 2019	Incorporating IEC comments	1

 

 

 

 

 

Item	Content	Page
1	Rationale for Relocating Water Monitoring Location F1	4
2	Marine Water Quality Monitoring Locations for the Project (refer to the Updated EM&A Manual)	5
3	Criteria and Selection of a New Monitoring Station for Replacing F1	6
4	Conclusion	9
Appendix
Appendix 1 - E-mail from AFCD to Support the Rationale of Relocating F1

Rationale for Relocating Water Monitoring Location F1

Dr. Y. M. Mak, Marine Conservation Officer/ West1 of Agriculture, fisheries and conservation department raised concerns of mariculturists on possible adverse impacts to the Cheung Sha Wan fish culture zone due to the present marine water quality monitoring. Therefore, AFCD suggested to ET to relocate the F1 marine water quality monitoring location outside the fish culture zone. The e-mail from Dr Mak is attached in Appendix 1 for reference.

 

As such and pursuant to Condition 3.1 of the Environmental Permit and 4.3.1 paragraph of EM&A Manual, it is thus proposed to relocate the F1 water monitoring location to a new location to be named as F1A. as shown in Figure 1 for verification by IEC and approval by EPD.

 

Figure 1 – Location of marine water monitoring location of F1 (existing) and F1A (newly proposed) for Cheung Sha Wan fish culture zone

 

1       Marine Water Quality Monitoring Locations for the Project (refer to the Updated EM&A Manual)

1.1       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.

 

1.2       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.

 

1.3       Monitoring stations B1 to B4 are located at 4 beaches respectively at the southern shore of Lantau Island.

 

1.4       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.

 

1.5       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.

 

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

 

1.7       The 14 nos. of monitoring stations for Marine Water Quality for Baseline and Impact Monitoring during Construction Phase are tabulated below with F1 highlighted:

 

 

 

2       Criteria and Selection of a New Monitoring Station for Replacing F1

2.1       The new monitoring station F1A to replace F1 should satisfy the following criteria:

a)     The new monitoring station shall be outside but near to the fish culture zone for fulfilling the purpose of monitoring the impact from the construction site.

 

b)    The new monitoring station shall have similar sea water influent during flood tide and tide turning from flood to ebb tide as that for F1. This allows detection of any possible contamination plume from construction site to the fish culture zone with similar monitoring results. See below Figure 2 – 4 for the tidal stream pattern and predicted tide obtained from Marine Department (MD) and Hong Kong Observatory (HKO) website.

As other tide periods such as ebb-tide, see below Figure 2, 5 & 6, the tide pattern will not bring contamination plume from the construction site to the fish culture zone. Therefore, the new monitoring location at eastern side of F1 is more appropriate than at northern side of F1.

c)     Location of the new monitoring station can be easily presented by AFCD to the mariculturists in addressing their concerns on the present monitoring work within the fish culture zone.

 

2.2       Selection the Location for the New Monitoring Station

Having considered the above three criteria, we propose to select the location of CSW2 shown in Figure 7. This location is at the boundary of the fish culture zone, having similar sea water influent characteristics from the construction site as for F1, see Figure 8 & 9, and is well known by the mariculturists.

 

(Cont’d 3.2)

This new monitoring station will be named as F1A with the following coordinates, the close proximity between F1 and F1A is also shown in Figure 10.

Coordinates of F1 & F1A

Monitoring Stations	Northing	Easting
F1	810966	818631
F1A	810924	819109

 

3       Conclusion

3.1       After relocation of the monitoring locations, the concern of the Mari-culturist on the possible adverse impact due to the present marine water quality monitoring to the fish culture zone can be addressed.

 

3.2       The proposed relocation will not adversely affect the integrity and accuracy of water quality monitoring programme.

 

Appendix 1

E-mail from AFCD to Support the Rationale of Relocating F1