on 16 October 1998
ITEM FOR FINANCE COMMITTEE
CAPITAL WORKS RESERVE FUND
HEAD 708 - CAPITAL SUBVENTIONS AND MAJOR SYSTEMS AND EQUIPMENT
New Subhead "Upgrading of environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel"
Members are invited to approve a new commitment of $39.2 million for upgrading the environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel.
The existing environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel do not meet the requirements laid down in the "Practice Note on Control of Air Pollution in Vehicle Tunnels" (the Practice Note) issued by the Environmental Protection Department (EPD).
2. We propose to upgrade the environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel at an estimated cost of $39.2 million.
3. An environmental monitoring system comprising mainly gas analyzers is used to monitor the concentration level of air pollutants inside a vehicle tunnel. The Practice Note requires that the air quality parameters of Carbon Monoxide (CO), Nitrogen Dioxide (NO2) and visibility (VI) be measured continuously inside a vehicle tunnel to ensure acceptable air quality. To meet this requirement, there should be at least one analyzer for each parameter at each kilometre (km) section of a tunnel, capable of reading and transmitting real time data to the control panel of the monitoring system for processing. The data will form controlling parameters for operating the tunnel ventilation system at the appropriate capacity to provide sufficient fresh air to and extract vitiated air from the vehicle tunnel.
4. Designed and installed ten to 15 years ago, the environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel cannot meet the requirements of the Practice Note. Enclosure 1illustrates the extent of their compliance. Besides, these systems are reaching the end of their serviceable life. We encounter increasing difficulties in obtaining spare parts for their maintenance. We therefore propose to upgrade the existing environmental monitoring systems in the four tunnels for more effective monitoring and control of air quality. Subject to Members' approval, we plan to start the project planning immediately for completion in April 2000.
5. We estimate that the total non-recurrent expenditure is $39.2 million, broken down as follows -
|(a) Installation of||29.8
- combined emitters and receivers for CO and NO2
- CO and NO2 gas analyzers
- air-conditioned cabinets
- VI sensors
- local and central computer equipment
|(b) Procurement of||1.5
- calibration equipment for sensors
- portable Sulphur Dioxide (SO2) sensors
|(c) Electrical and Mechanical Services Trading Fund (EMSTF) project management charges
|(d) Contingencies [10% of (a) to (c)]||3.5
6. Subject to Members' approval, we will phase the expenditure as follows -
7. As regards paragraph 5(a), the cost of $29.8 million is for the acquisition and installation of emitters and receivers for CO and NO2 sensors and analyzers, air-conditioned cabinets for housing the CO and NO2 gas analyzers, VI sensors for reading visibility, computer equipment for air quality monitoring and connective cables.
8. As regards paragraph 5(b), the cost of $1.5 million is for the procurement of calibration equipment for gas sensors and portable SO2 sensors to ensure compliance of air quality standard in the four tunnels.
9. As regards paragraph 5(c), the cost of $4.4 million is for paying the EMSTF for engineering consultancy services. The trading fund will undertake the whole project which involves the installation of electronic, electrical and mechanical equipment on behalf of Transport Department (TD). The work includes feasibility study, definition of requirements, preparation of project programme and estimate, design, tendering, site inspection, monitoring installation, testing and commissioning of equipment, and rectification of defects during the defect liability period. A detailed breakdown of the charges is at Enclosure 2.
10. There are no additional recurrent expenditure. The operation and maintenance costs of the environmental monitoring systems will be met by the contractors under the management contract for the respective tunnels.
11. The proposal will have no impact on toll charges.
12. We propose to group requirements for the four tunnels into a single contract to be awarded on a lump-sum fixed price basis through an open public tender at one go. This would minimise administrative efforts, lower the total project cost and shorten the overall project time schedule.
13. In June 1997, the Legislative Council passed three Private Members' Bills to upgrade the air quality standards of the Cross-Harbour Tunnel, Eastern Harbour Tunnel and Tate's Cairn Tunnel. Although these legal requirements do not apply to Government vehicle tunnels, TD requested Electrical and Mechanical Services Department (EMSD) to investigate whether the existing environmental monitoring systems of the Government vehicle tunnels meet the requirements of the Practice Note on the monitoring of air quality. The investigation revealed that the environmental monitoring systems in Lion Rock Tunnel, Aberdeen Tunnel, Shing Mun Tunnels and Tseung Kwan O Tunnel do not meet the requirements. EMSD has recommended system upgrading.
14. The remaining two Government vehicle tunnels, Airport Tunnel and Cheung Ching Tunnel, have the necessary environmental monitoring systems.
Enclosure 1 to FCR(98-99)35
Analysis of Existing Environmental Monitoring Sensors in
Lion Rock Tunnel (LRT), Aberdeen Tunnel (ABT),
Shing Mun Tunnels (SMT) and Tseung Kwan O Tunnel (TKO)
|Air quality parameter
||Environmental monitoring sensors
||Sensor at every kilometre (km)
|Data expressed in Extinction Coefficient
|VI data available (1)||X
|Sensor at every km (2)||X
|NO2 data available (1)||(3)||X
|Sensor at every km
|CO data available (1)||X
(1) The Environmental Protection Department (EPD) Practice Note requires that air quality data should be available at five-minute intervals round the clock.
(2) No NO2 sensors are installed at the four tunnels.
(3) Only Nitric Oxide (NO) data are available. The NO data may be converted to NO2 data using formula prescribed by EPD.
Enclosure 2 to FCR(98-99)35
Project Management Charges under
Electrical and Mechanical Services Trading Fund
for Upgrading of Environmental Monitoring Systems in
Lion Rock Tunnel, Aberdeen Tunnel,
Shing Mun Tunnels and Tseung Kwan O Tunnel
|% of charges on|
|Project estimate |
for electronics works
|First $0.4 million
|Next $1.6 million
|Next $13 million
|Remainder $16.3 million