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29 Sep 2015 / Hong Kong

Marine Site Investigation and Deep Cement Mixing Trial Works

For approximately 5 months, marine works involving marine site investigation and deep cement mixing trial works involving drilling of boreholes, diving operations, water monitoring and hydrographic survey 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 (F):
(A) 22 deg. 19.855'N / 113 deg. 54.708'E
(B) 22 deg. 19.650'N / 113 deg. 54.785'E
(C) 22 deg. 19.445'N / 113 deg. 54.861'E
(D) 22 deg. 19.303'N / 113 deg. 54.421'E
(E) 22 deg. 19.508'N / 113 deg. 54.344'E
(F) 22 deg. 19.713'N / 113 deg. 54.268'E

Yellow marker buoys fitted with yellow flashing lights and radar reflectors will be laid to mark the boundary of the works area at co-ordinates from (A) to (F).

One drilling barge, one flat top barge, one derrick lighter and two jack-up platforms will carry out the works at various stages. Some tugs and guard boats will provide assistance. The number 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 the drilling barge. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from the drilling barge.

A working area of approximately 50 metres will be established around the flat top barge and derrick lighter. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from the flat top barge and derrick lighter.

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 platform to indicate the positions of the platforms.

To facilitate the drilling works on the top of mud pit, sand blankets will be temporarily laid within the works area. The water depth at the sand blanket area will be temporarily reduced to 1.5 metres. Four yellow marker buoys fitted with yellow flashing lights will be laid to mark the boundary of the sand blanket area at the following co-ordinates (WGS 84 Datum) from (WS1) to (WS4):
(WS1) 22 deg. 19.610'N / 113 deg. 54.581'E
(WS2) 22 deg. 19.563'E / 113 deg. 54.598'E
(WS3) 22 deg. 19.542'N / 113 deg. 54.553'E
(WS4) 22 deg. 19.592'N / 113 deg. 54.531'E

To safeguard the trial works and ensure navigational safety, the guard boats stationing in the works area or patrolling the waters in the vicinity will give necessary guidance to the vessels approaching the works area. Upon completion of the marine works, the sand blankets will be removed from the works area.

The hours of works will be round-the-clock. Diving operations will be carried out from time to time during the day time.

Vessels engaged in the operations will display signals as prescribed in international and local regulations.

Vessels navigating in the vicinity should proceed with caution and keep clear at slow speed, bearing in mind that there are divers working in the works area.

(For information about operations in Hong Kong contact GAC Hong Kong at [email protected])

Source: Government of Hong Kong SAR Marine Department Notice No.129 of 2015

If quoting any content from Hot Port News, please cite GAC Hot Port News as the source.

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