3.1 Waste management will be the contractor’s responsibility to ensure that all wastes produced during the construction of the Lung Kwu Chau Jetty are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements. The contractor will be required to ensure that loss of dredged material does not take place during transportation of the material in barges to the designated marine disposal ground.
3.2 Other waste materials generated during construction activities, such as construction and demolition (C&D) materials, 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 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 minimise waste or redress problems arising from the waste materials.
3.3 Mitigation measures for waste management are summarised below. With the appropriate handling, storage and removal of waste arisings during the construction of the jetty as defined below, the potential to cause adverse environmental impacts will be minimised. The implementation schedule of the recommended mitigation measures is presented in Appendix A. During the site inspections, the ET shall pay special attention to the issues relating to waste management and check whether the Contractor has implemented the recommended good site practices and other mitigation measures.
3.4 The basic requirements and procedures for dredged mud disposal are specified under the WBTC No. 3/2000. The management of the dredging, use and disposal of marine mud is monitored by the MFC, while the licensing of marine dumping is the responsibility of the Director of Environmental Protection (DEP).
3.5 The dredged marine sediments will be loaded onto barges and transported to the designated disposal site. Category L sediments were found at the project area and therefore the sediments are suitable for open sea disposal. At this stage in the engineering design and based on the sediment sampling results, it is estimated that some 5,550 m3 of sediments will require open sea disposal. In accordance with the WBTC No. 3/2000, the material must be dredged, transported and disposed in a manner which minimizes the loss of contaminants either into solution or by resuspension.
3.6 During transportation and disposal of the dredged marine sediments, the following measures should be taken to minimise potential impacts on water quality:
· Bottom opening of barges shall be fitted with tight fitting seals to prevent leakage of material. Excess material shall be cleaned from the decks and exposed fittings of barges and hopper dredgers before the vessel is moved.
· Monitoring of the barge loading shall be conducted to ensure that loss of material does not take place during transportation. Transport barges or vessels shall be equipped with automatic self-monitoring devices as specified by the DEP.
Good Site Practices and Waste Reduction Measures
3.7 Appropriate waste handling, transportation and disposal methods for all waste arisings generated during the construction works should be implemented to ensure that construction wastes do not enter the marine waters of the Sha Chau and LKC Marine Park.
3.8 It is not anticipated that adverse waste management related impacts would arise, provided that good site practices are strictly followed. Recommendations for good site practices during the construction activities include:
· nomination of an approved personnel, such as a site manager, to be responsible for good site practices, arrangements for collection and effective disposal to an appropriate facility, of all wastes generated at the site;
· training of site personnel in proper waste management procedures;
· high standards of waste management should be observed on the works vessels and barges to ensure that no waste arisings or fuel/diesel oils are disposed to the surrounding marine waters;
· careful control should be exercised during the demolition works and strict waste management procedures will be required to ensure that no C&D materials and machinery fuels enter the marine waters at the site;
· no stockpiles of construction material should be permitted on Lung Kwu Chau Island;
· all wastes, unused construction materials and construction equipment should be removed from Lung Kwu Chau Island after the works are completed;
· a recording system for the amount of wastes generated, recycled and disposed of (including the disposal sites); and
· in order to monitor the disposal of C&D material at public filling areas, and to control fly-tipping, a trip-ticket system should be included as one of the contractual requirements. One may make reference to WBTC No. 5/99 for details.
· A Waste Management Plan (WMP) should be prepared by the Contractor and this WMP should be submitted to the Engineer for approval.
3.9 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:
· prior to disposal of C&D waste, it is recommended that wood, steel and other metals shall 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 use of construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste.
3.10 The recommended mitigation measures for the transportation and disposal of dredged marine sediments from the construction phase dredging should also be implemented as appropriate during maintenance dredging.