5.1 Waste management would be the contractor’s responsibility to ensure that all wastes produced during the construction works for the slip roads are handled, stored and disposed of in accordance with good waste management practices and EPD’s regulations and requirements.
5.2 Waste materials generated during construction activities, such as construction and demolition (C&D) materials and general refuse, are recommended to be audited at regular intervals (at least quarterly) to ensure that proper storage, transportation and disposal practices are being implemented. This monitoring of waste management practices would ensure that these solid wastes generated during construction are not disposed of into the adjacent nullahs. The Contractor would be responsible for the implementation of any mitigation measures to minimise waste or redress problems arising from the waste materials.
5.3 Mitigation measures for waste management are summarised below. With the appropriate handling, storage and removal of waste arisings during the construction works as defined below, the potential to cause adverse environmental impacts would 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.
5.4 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 the implementation of 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 site cleanliness, appropriate waste management procedures, including chemical waste handling procedures, and concepts of waste reduction, reuse and recycling;
· provision of sufficient waste disposal points and regular collection for disposal;
· appropriate measures to minimise windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers;
· 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;
· a recording system for the amount of wastes generated, recycled and disposed (including the disposal sites) should be proposed; and
· a waste management plan (WMP) should be prepared in accordance with ETWB TC No. 15/2003 and submitted to the Engineer for approval.
5.5 In order to monitor the disposal of C&D material at the designated public filling facility and to control fly tipping, the Trip-ticket System in accordance with ETWB TC No. 21/2002 should be included as one of the contractual requirements and implemented by the Environmental Team undertaking the environmental monitoring and audit work. Disposal of C&D material shall only be permitted at the public filling facility designated by CED. C&D material shall not be permitted to be dumped to fish ponds or other illegal locations.
5.6 Good management and control can prevent the generation of significant amounts 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 shall be provided to segregate this waste from other general refuse generated by the work force;
· any unused chemicals or those with remaining functional capacity shall be recycled;
· maximising the use of reusable steel formwork to reduce the amount of C&D material;
· 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.
5.7 In addition to the above good site practices and waste reduction measures, specific mitigation measures are recommended below for the identified waste arisings to minimise environmental impacts during handling, transportation and disposal of these wastes.
5.8 General refuse should be stored in enclosed bins or compaction units separate from C&D material. A reputable waste collector should be employed by the contractor to remove general refuse from the site, separately from C&D material. An enclosed and covered area is preferred to reduce the occurrence of 'wind blown' light material.
5.9 In order to minimise the impact resulting from collection and transportation of C&D material for off-site disposal, the material suitable for reuse shall be reused on-site as backfill material as far as possible.
5.10 When disposing C&D material at a public filling facility, it shall be noted that the material shall only consist of soil, rock, concrete, brick, cement plaster/mortar, inert building debris, aggregates and asphalt. The material shall be free from marine mud, household refuse, plastic, metals, industrial and chemical waste, animal and vegetable matter, and other material considered to be unsuitable by the public fill operators.
5.1 If chemical wastes are produced at the construction site, the Contractor would be required to register with the EPD as a Chemical Waste Producer and to follow the guidelines stated in the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes. Good quality containers compatible with the chemical wastes should be used, and incompatible chemicals should be stored separately. Appropriate labels should be securely attached on each chemical waste container indicating the corresponding chemical characteristics of the chemical waste, such as explosives, flammable, oxidizing, irritant, toxic, harmful, corrosive, etc. The Contractor shall use a licensed collector to transport and dispose of the chemical wastes generated at the Chemical Waste Treatment Centre at Tsing Yi, or other licenced facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.