Cause of Impact
Construction waste include construction and demolition (C&D) materials, e.g. excavated C&D materials, C&D waste; excavated contaminated materials and sediments; chemical waste; and general refuse.
During operational phase, the station and the associated facilities will generate general refuse, and small amount of industrial waste and chemical waste.
The recommended mitigation measures for different categories of waste are as follows:
- The requirements as stipulated in the ETWB TC(W) No.19/2005 Environmental Management on Construction Sites and the other relevant guidelines should be included in the Particular Specification for the Contractor as appropriate;
- The Contractor should incorporate waste management recommendations into a comprehensive on-site Environmental Management Plan (EMP) to include factors such as designation of areas for the segregation and temporary storage of materials for future use or recycling;
- The waste management hierarchy should be strictly followed in order to maximise the extent of waste reduction and cost reduction;
- A trip-ticket system should be established to monitor the disposal of public fill and solid wastes at public filling facilities and landfills, and to control fly-tipping; and
- A recording system for the amount of waste generated, recycled and disposed (locations) should be established.
- Maintain temporary stockpiles and reuse excavated fill material for backfilling and reinstatement;
- Carry out on-site sorting;
- Allow and promote the use of recycled aggregates where appropriate;
- Adopt ‘Selective Demolition’ technique to demolish the existing structures and facilities, where possible;
- Implement a trip-ticket system for each works contract; and
- Implement an enhanced Waste Management Plan, which become a part of the Environmental Management Plan in accordance with “ETWBTC (Works) No. 19/2005 – Waste Management on Construction Site”.
- Standard formwork or pre-fabrication should be used as far as practicable;
- Use of wooden hoardings should be avoided;
- Metal hoarding should be used;
- The purchasing of construction materials will be carefully planned in order to avoid over ordering and wastage; and
- The Contractor should recycle as much of the C&D materials as possible on-site.
Excavated Contaminated Materials and Land-based and Marine-based Marine Sediment
- Contaminated marine mud shall be transported by split barge and capable of rapid opening and discharge at the disposal site;
- Discharge shall be undertaken rapidly and the hoppers shall be closed immediately; and
- For Type 3 special disposal treatment, sealing of contaminant with geosynthetic containment before disposing into designated location.
- General refuse generated on-site should be stored in enclosed bins or compaction units separately from construction and chemical wastes;
- A reputable waste collector should be employed to remove general refuse from the site, separately from construction and chemical wastes.
- Burning of refuse on construction sites is prohibited by law;
- Separate labelled bins for aluminium cans should be provided; and
- Office wastes shall be collected for recycle if possible.
- The Contractor should register with EPD as a chemical waste producer; and
- All chemical waste should be handled in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.
General Refuse and Industrial Waste
- A reputable waste collector should be employed to remove general refuse and industrial wastes.
- The requirements given in the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes should be followed; and
- A trip-ticket system should be operated in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.
The quantity and timing for the generation of waste during construction and operational phases have been assessed. Mitigation measures, including the opportunity for on-site sorting, reusing excavated fill materials, etc, have been considered in the construction methodology to minimize the surplus materials to be disposed off-site. With the implementation of recommended mitigation measures to ensure proper handling, treatment and disposal of the wastes, adverse impacts are not anticipated for both the construction and operational phases.