21 March 2017
Marine works for construction of three-runway system north of airport
For approximately 12 months, marine works involving reclamation, seawall construction, sand filling, deep cement mixing works, drilling of boreholes, laying of sand blankets, water monitoring, hydrographic survey and diving operations will be carried out [north of Hong Kong International Airport] in the area bounded by straight lines joining the following co-ordinates (WGS 84 Datum) from (A) to (V) and the adjacent shoreline:
(A) 22 deg. 18.059’N / 113 deg. 53.861’E
(B) 22 deg. 18.120’N / 113 deg. 52.852’E
(C) 22 deg. 18.667’N / 113 deg. 52.446’E
(D) 22 deg. 18.558’N / 113 deg. 52.096’E
(E) 22 deg. 18.835’N / 113 deg. 52.139’E
(F) 22 deg. 19.103’N / 113 deg. 52.181’E
(G) 22 deg. 19.380’N / 113 deg. 52.224’E
(H) 22 deg. 19.551’N / 113 deg. 52.709’E
(I) 22 deg. 19.722’N / 113 deg. 53.193’E
(J) 22 deg. 19.670’N / 113 deg. 53.212’E
(K) 22 deg. 19.820’N / 113 deg. 53.676’E
(L) 22 deg. 19.971’N / 113 deg. 54.140’E
(M) 22 deg. 20.119’N / 113 deg. 54.604’E
(N) 22 deg. 20.265’N / 113 deg. 55.070’E
(O) 22 deg. 20.418’N / 113 deg. 55.533’E
(P) 22 deg. 20.214’N / 113 deg. 55.994’E
(Q) 22 deg. 20.097’N / 113 deg. 56.257’E
(R) 22 deg. 19.946’N / 113 deg. 56.597’E
(S) 22 deg. 19.833’N / 113 deg. 56.850’E
(T) 22 deg. 19.642’N / 113 deg. 56.919’E
(U) 22 deg. 19.357’N / 113 deg. 56.832’E
(V) 22 deg. 19.329’N / 113 deg. 56.755’E
Yellow marker buoys fitted with yellow flashing lights and radar reflectors will be laid at co-ordinates from (D) to (R) to mark the boundary of the works area. Two yellow marker buoys with Automatic Identification System will be laid at co-ordinates of (G) and (O).
Silt curtains, extending from the sea surface to the seabed, will be established around the boundary of the works area. The silt curtain is a large piece of netting used to contain mud and sediments. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the extent of the silt curtains.
The works will be carried out by a flotilla of vessels including drilling barges, trailer suction hopper dredgers, derrick lighters, flat top barges, jack-up platforms and survey boats at various stages. Some tugboats, guard boats and self-propelled delivery barges will provide assistance. The number and type of vessels engaged in the works will change from time to time to suit operational requirements.
A working area of approximately 150 metres will be established around each drilling barge. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from the drilling barges.
A working area of approximately 50 metres will be established around each derrick lighter and flat top barge. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from the derrick lighters and flat top barges.
A working area of approximately 25 metres will be established around each jack-up platform. Yellow flashing lights will be installed at the four corners of the platforms to indicate the positions of the platforms.
To facilitate the drilling works, sand blankets will be temporarily laid within the works area. The water depth at the areas where sand blankets are laid will be temporarily reduced by about 2.0 metres. Yellow marker buoys fitted with yellow fixed lights will be laid to mark the boundaries of such areas.
To safeguard the deep cement mixing works and ensure navigational safety, guard boats will station in the works area and patrol the waters in the vicinity to give necessary guidance to the vessels approaching the works area.
The hours of works will be round-the-clock. Diving operations will be carried out from time to time during the hours of work.
Vessels engaged in the operations will display signals as prescribed in international and local regulations.
Vessels navigating in the vicinity should proceed with caution.
(For information about operations in Hong Kong contact GAC Hong Kong at firstname.lastname@example.org)
Source: Government of Hong Kong SAR Marine Department Notice No.39 of 2017