6.1 Waste management will be the Contractor’s responsibility to ensure that all wastes produced during the construction phase of the Project are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements.
6.2 Other waste materials generated during construction activities, such as construction and demolition (C&D) materials, chemical wastes and general refuse from the workforce, are recommended to be audited at regular intervals (at least monthly) to ensure that proper storage, transportation and disposal practices are being implemented. This monitoring of waste management practices will ensure that these solid and liquid wastes generated during construction are not disposed of into the surrounding marine waters. The Contractor will be responsible for the implementation of any mitigation measures to minimize waste or redress problems arising from the waste materials.
Good Site Practices and Waste Reduction Measures
· Nomination of an approved person, such as a site manager, to be responsible for the implementation of good site practices, arranging for collection and effective disposal to an appropriate facility, of all wastes generated at the site.
· Training of site personnel in proper waste management and chemical handling procedures.
· Appropriate measures to minimize windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers.
· Provision of sufficient waste disposal points and regular collection for disposal.
· Separation of chemical wastes for special handling and appropriate treatment at the Chemical Waste Treatment Facility.
· Regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors.
· Maintain records of the quantities of wastes generated, recycled and disposed.
6.5 In order to monitor the disposal of C&D waste at landfills and to control fly tipping, a trip-ticket system should be included as one of the contractual requirements and implemented by an Environmental Team undertaking the Environmental Monitoring and Audit work. An Independent Environmental Checker should be responsible for auditing the results of the system.
6.6 Good management and control can prevent the generation of significant amount of waste. Waste reduction is best achieved at the planning and design stage, as well as by ensuring the implementation of good site practices. Recommendations to achieve waste reduction include:
· segregation and storage of different types of waste in different containers, skips or stockpiles to enhance reuse or recycling of materials and their proper disposal;
· to encourage collection of aluminium cans by individual collectors, separate labelled bins should be provided to segregate this waste from other general refuse generated by the work force;
· any unused chemicals or those with remaining functional capacity should be recycled;
· use of reusable non-timber formwork to reduce the amount of C&D material;
· prior to disposal of C&D waste, it is recommended that wood, steel and other metals should be separated for re-use and / or recycling to minimise the quantity of waste to be disposed of to landfill;
· proper storage and site practices to minimise the potential for damage or contamination of construction materials; and
· plan and stock construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste.
General Site Wastes
6.7 A collection area should be provided where waste can be stored prior to removal from site. An enclosed and covered area is preferred for the collection of the waste to reduce 'wind blow' of light material.
Chemical Wastes
6.9 Any service shop and minor maintenance facilities should be located on hard standings within a bunded area, and sumps and oil interceptors should be provided. Maintenance of vehicles and equipment involving activities with potential for leakages and spillage should only be undertaken with the areas appropriately equipped to control these discharges.
Construction and Demolition Material
6.12
Wastes generated during normal STW
operations would include inlet screenings, grit from detritors and dewatered
sludge. It has been proposed that the
sewage sludge generated from the STW would be dewatered on-site and the sludge
cake would be delivered to Sok Kwu Wan refuse transfer station for disposal to
nearby landfill.
6.13 Table 6.1 provides a summary of the various waste types likely to be generated during construction and operational phases, together with the recommended handling and disposal methods. The implementation schedule of mitigation measures is presented in Appendix A.
Table 6.1 Summary of Waste Handling Procedures and Disposal Routes
|
Waste Type
|
Handling |
Disposal |
|
Construction |
|
|
|
Construction & Demolition Material |
Where possible should be re-used on-site |
On-site for pavement re-instatement |
|
|
If off-site disposal required, separate into: · Public fill (e.g. concrete and rubble)
· C&D waste for re-use and/or recycling (e.g. steel and other metals, wood, plastic)
· C&D waste which cannot be re-used and/or recycled
|
Public filling area or reclamation
Steel and other metals should be separated for re-use and/or recycling where practicable before disposal of at landfill.
Landfill |
|
Maintenance and Chemical Wastes |
Recycle on-site or by licensed companies Stored on-site within suitably designed containers |
By licenced contractor to Chemical Waste Treatment Facility |
|
Workforce Wastes |
Provide on-site refuse collection facilities
|
Landfill, collection by private hygiene company |
|
Operation |
|
|
|
Sewage sludge |
Dewatered on-site |
Landfill |