02-MAR-1992 17:36
G.I.S.
craft or to service routes to other destina- tions. possibly on the Pearl River.
For the purposes of this study, it is planned that aircraft fuc) will be delivered by fuel barges. These barges will discharge at two piers. one adjacent to the north wall op- posite the eastern end of the runway and the other north of the ferry complex. The second pier will serve as backup. Other options of aircraft fuel supply are under consideration and it is acknowledged that the final decision regarding supply and distribution has commercial implications, and the proposed method may be subject
to review.
Sca rescue craft will be docked against piers, onc located at the western end of the sea channel and the other adjacent to the ferry complex. These piers will be con- structed to moor the rescue craft in wind speeds and sea conditions corresponding to Typhoon Signal No. 8. At higher wind speeds the airport is unlikely to be operat- ing and the rescue craft can take shelter
elsewhere.
Sewerage
Most of the sewage produced on the airport island will be fed by pipe gravity systems 10 intermediate pumping stations. From these stations. rising mains will lead to a main pumping station, located at the southeastern corner of the island, from where the sewage will be pumped to a reception chamber in Tung Chung New Town and on to a sewage treatment plant located at Siu Ho Wan.
Solid Waste Disposal
Large quantities of solid waste will be produced on the airpon and special care must be taken to ensure that security is not compromised by its disposal. Consequent- ly, all solid waste will be collected from the airside areas, in containers appropriate to the application, and transported to an air- side dock at a refuse transfer station.
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Refuse from the landside (unsecured) air- port and airport-related areas can either be delivered to a landside dock at the on-site refuse transfer station, from which there will be no connection with the secured air- side portion, or taken directly to the Siu Họ Wan refuse transfer station. This choice will be made when the business strategy of the disposal is better known.
Water Supply
Water Supplies Department will provide water to the new airport via the distribu- tion system planned for North Lantau. A service reservoir will be located near Tung Chung from which dual supplies will lead to the island. A ring main distribution net- work will supply all points of fresh water consumption with local storage being provided appropriate to specific require- ments. No general on-island storage of potable water is proposed.
Firefighting water will be supplied from the potable water system. In general, firefight- ing water will be stored appropriate to the building or complex covered, but the hydrant system serving the airfield, includ- ing the apron, will have its own dedicated storage. Pumps will be provided to ensure sufficient mains pressure to fight fires.
There will be a need for irrigation water, especially during the dry season. This will be partially provided by collecting waste water which is not contaminated by sea water, such as that from food preparation, and passing it through an on-site treatment plant to produce water which, although not potable, is suitable for imigation purposes. Additional sources of irrigation water will need to be identified.
A salt water reticulation system will provide the dual function of a heat sink for air-con- ditioning purposes and a source of flushing water. After heat exchange, some of the sea water will be stored in tanks for flushing purposes, with the majority being dis- charged into the storm drainage system for
return to the sca. Three salt water systems are proposed, cach with its own screening and pumping station. One will serve the passenger terminals and development at the northeast; one will serve the main- tenance area at the west end of the airport; and the third will serve the facilities to the south of the southern runway.
Electricity Supply
Electrical power will be provided via three 132kV circuits to two primary sub- stations. From these substations, the power will be distributed via switching stations to local substations at 11kV. Further substations, which will be ad- jacent to points of consumption, will transform the power to the supply voltage of 380V. Ring mains or duplicate feeds will be used to ensure security of supply.
In the event of mains power failure, emer- gency generators will be provided to ensure continued safe operation of the airport and to maintain essential services.
Gas Supply
A high pressure towngas submarine pipeline to Lantau is planned, either from Tuen Mun or Tai Lam, which will terminate at Siu Ho Wan. From there, the gas will be piped to the airport and distributed via a control station and a ring main system 10 the various consumers. No storage facility will be required at the new airport. The whole system will be suitable either for towngas or natural gas, if and when it is made available.
Communications
Various cable and optical communication systems will be required and a ductwork network will be provided to facilitate instal- lation. A telephone exchange will be con- structed adjacent to the airport to provide the necessary voice and data communica- tions to service both the airpon and all the adjacent facilities.
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