02-MAR-1992 17:32
G.I.S.
+ 852 537 1540
P.10
Hong Kong Territorial Boundary
1
Outer Deep (Bay Area
1
الله
Urmston Road Area
New Territories
Brothers Area
East Sha Chal Área
▸ Mo To Chay
(The Brothers).
Kong
Lantau Island
Cheung Chau
Tsing Yi
South Cheung Chau Arca
Legend
Borrow Pit and Dump Site
0 2
4 630 ↓
Dump Site
Marine Borrow Pits and Dump Sites
In addition to the fill obtained by excavating the existing islands, a further 53 million cubic metres of fill will be obtained by dredging sand froh borrow pits on the sea bed: 7 million cubic metres of fill will be obtained by removing the tops of the
Brothers Islands, and 6 million cubic
metres will be obtained from excavation for
the Route 3 project on Tsing Yi island.
The borrow pits which may be used are located in Outer Deep Bay. Urmston
Road, East of Sha Chau and near the
Brothers Islands. The 184 million cubic
metres of mud to be removed from the
airport site and the borrow pits, where it is overlying the sand deposits in layers generally 5m to 10m thick, will be deposited in the South Cheung Chau gazetted marine dump or backfilled into the pits created at
the borrow areas.
The first step in developing the airport site
was the initiation of an Advance Works Contract. The purpose of this work is to prepare a working base of approximately 40 hectares of land which will be used by the main reclamation contractor as a staging area for equipment and offices during the Site Preparation Contract. This latter con- tract will form the platform on which the airport will be built. The Advance Works Contract is scheduled to be completed in spring 1992.
The preparation of tender documents and the contractor prequalification procedures have been completed and construction of
the main site formation is scheduled to
commence in mid 1992.
Seawalls
The perimeter of the airport site will be exposed, to the action of waves and cur- rents, which during storms, especially typhoons, can exen considerable loads on the edge of the reclamation. Seawalls 14.580m in length have been designed to resist these wave forces, to limit over-top- ping and to protect the reclamation against possible wave damage.
Most of the reclamation edge will be protected by sloping seawalls, constructed of graded rockfill. but overlain on the scaward face by large 5 tonne boulders termed rock armour. Both 2 dimensional
and 3 dimensional scale models were used to assist in optimizing the design of the sloping seawalls.
Until shortly before the airpon is opened and the Lantau Fixed Crossing is complete.
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