02-MAR-1992 17:40
Q.1.5.
NEF contours were generated for the year 2000, since this represents the first com- plete year when the airport will have two fully functional runways. Contours were also generated for year 2030, to represent a "worst case" for ɖverall noise impact. since it is projected that beyond this year the introduction of a significant number of larger aircraft will be able to accommodate
a higher number of passengers without sig- nificantly increasing the total number of operations.
Land use planning for the North Lantau Development has taken into account the NEF forecasts. Based on existing (year 1991) development, only approximately 14 NSRs, all of which are along the shore of Sha Lo Wan on North Lantau, will lie within
the 25 NEF contour for the year 2000. In the year 2030, approximately 500 NSRs arc projected to be within the 25 NEF contour. These NSRs are primarily located in and around the village of Sha Lo Wan and on the island of Ma Wan. with a few being scattered on either side of the sea channel
between North Lantau and the New Ter-
ritories. Approximately 14 of these NSRs, all along the shore of Sha Lo Wan, are also projected to be within the 30 NEF contour in the year 2030.
The total number of NSRS projected to be impacted is exceptionally small for a major international airport. primarily be- cause such a large proportion of the con- tours are over open water. It is proposed that occupants of those NSRs falling within the 25 NEF noise contour for year 2000 will be profided funding to relocate before the airport becomes operational. As was indicated previously, the Master Plan and operațional environmental im- pacts will be updated periodicully, and during these updates 25 NEF noise con- tours should be developed for the existing year and five years into the future. If newly-impacted NSRS are identified within these contours, then mitigation measures should be developed and im- plemented at that time.
A very positive impact resulting from the transfer of operations from Kai Tak to the new airport is the removal of a very un- desirable noise impact from large areas of Kowloon. Aircraft noise arising from operations at the existing airport was es- timated in 1990 to be affecting some 240,000 residents. This is projected to in- crease to 350.000 when the airport is operating at maximum capacity. This en- vironment will be substantially improved as a result of moving operations to the new airport site.
Air Quality
The two principal sources of air emissions associated with the new airport are aircraft
and motor vehicles. The results of com- puter modelling indicate that under "worst case" meteorological conditions. contribu- tions to pollution levels on North Lantau from on-airport activities are projected to be well within the established Air Quality Objectives in the year 2040,
Water Quality
Sewage from the airport will be pumped to a sewage treatment works at Siu Ho Wan for treatment. together with sewage from the new town. The cffluent will be dis- charged through a long sea outfall.
Stormwater quality at the new airport is likely to be comparable with that of urban runoff: containing solids, organic matter. nutrients and micropollutants, such as heavy metals and petroleum hydrocarbon residues. An assessment of the impact of possible pollutant loads discharged into the sea channel from the southern part of the airport reclamation suggested that pollutant concentrations are likely to remain relatively low, due to the flushing effect of tidal water movement along the sea channel. However, discharge of stormwater to the sea channel will be minimized due to the potentially sen- sitive nature of this water body.
Hazardous Materials
Daily airport operations will involve the use of a limited variety of hazardous materials,
chemical wastes and dangerous goods. Without proper management, storage and treatment. these materials can pose both potential health and environmental risks, Wherever possible, the use of hazardous materials or dangerous goods will be
eliminated. If substitutes are not available.
waste minimization and recycling policies will be implemented. To the extent neces- sary, chemical wastes can be transported to the chemical waste treatment facility at Tsing Yi for disposal. Secondary contain- ment of fuel tanks, distribution mains and hydrants will help prevent discharges to the environment. storm sewer or foul sewer.
Should accidental releases occur. it is proposed that a predetermined spill con- tainment plan be enacted immediately by the responsible party in cooperation with the PAA and the Fire Services, Marine and Environmental Protection Departments of Government, as necessary.
CONTINUOUS PLANNING REQUIREMENTS
The plan presented herein is a dynamic management tool that provides the PAA with a clear implementation direction for the initial design/construction programme and beyond. It also provides a degree of flexibility and opportunity to make adjust- ments as future air transportation activity and characteristics change.
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To reflect air travel trends and new developments, the phased development programme should be kept current by up- dating it periodically as conditions change. This requires monitoring and updating of all activity factors that form the basis for projecting demand and facilities require- ments. To do this. periodic reviews of ac- tivity forecasts, demand/capacity levels. planning and design standards and criteria, and planning documents should be carried out. As these elements are reviewed and updated, they will form the basis of the decision-making process to determine when and to what extent revisions of the
development plan may be necessary.
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TOTAL P.16
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