6                                  WASTE MANAGEMENT

6.1                            Introduction

This section sets out the handling, recycling, storage, transportation and disposal measures which are recommended to avoid, and minimize potential adverse impacts associated with waste arising from the construction of the Project.

6.2                            Waste Management Approach

6.2.1                      Management of Waste Disposal

In accordance with the Waste Disposal (Charges for Disposal of Construction Waste) Regulation, the Contractor should open a billing account with the EPD.  Every construction waste or public fill load to be transferred to the Government waste disposal facilities, namely public fill reception facilities, construction waste sorting facilities, and landfills will require a valid “chit” which contains information of the account holder (the Contractor) to facilitate waste transaction recording and billing to the waste producer.

Inert C&D material generated from the Project will be transferred to Tuen Mun Area 38 Fill Bank (TMFB), or other public fill reception facilities, managed by Civil Engineering and Development Department (CEDD), while the non-inert C&D material, after segregation, will be sent to West New Territories Landfill (WENT), or other waste disposal facilities, managed by the EPD.

A trip-ticket system will be maintained in accordance with Environment, Transport and Works Bureau Technical Circular No. 31/2004 and a recording system will also established for recording the amount of waste and C&D material generated, reused, recycled and disposed of (including the disposal sites) in a form of similar to relevant appendices of Environment, Transport and Works Bureau Technical Circular No. 19/2005.  A sample of waste flow table (WFT) is presented in Annex D to record the quantities of waste and C&D material generated each month.  The quantities and details of all the recyclable and reused materials will also be recorded in the monthly summary WFT.  The quantities of waste and C&D material generated, reused and recycled during the reporting month, together with the disposal sites, will be presented in monthly EM&A report.

6.2.2                      Approach to Reduce Waste Generation

Construction and Demolition (C&D) Material

C&D material would be generated from the following works of the Project:

·           Road widening works;

·           Construction of retaining wall and flyover;

·           Demolition of existing parapets or footing for existing noise barriers;

·           Fill slope / slope reprofiling involved in road realignment; and

·           Extension of subway in Left-Turn Lane A.  

The types of C&D material during the construction works would be excavated soil, fill and concrete.

The waste concrete and shotcrete will be segregated from other non-inert C&D material and be disposed of at TMFB, or other public fill reception facilities.

The non-inert C&D material will be further segregated into recyclable material, such as cardboard, carton box, waste paper and scrap metal for the collection by recyclers and non-recyclable material, such as waste timber and packaging material, which will be disposed of at WENT, or other waste disposal facilities.

General Refuse

General refuse will be generated from daily site office operation and workforce.  Recycling bins should be provided at strategic locations, such as the entrance of site office to facilitate recovery of aluminium cans and waste paper generated from the Site.  Materials collected in the recycling bins should be collected by or sold to local recyclers.

6.2.3                      Management of Chemical Waste

Chemical wastes likely to be generated from the construction of the Project may include:

·            Residual paints and solvents; and

·            Used lubricant oil from maintenance of the construction plant.

It is anticipated that the quantity of chemical waste to be generated will be small and in the order of a few hundred litres for whole construction phase.  These chemical waste will be stored and disposed of in an appropriate manner, as outlined in the Waste Disposal (Chemical Waste) (General) Regulation and the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.

The Contractor should register as a chemical waste producer with the EPD, and handle the chemical waste in accordance with the Code of Practice on the Package, Labelling and Storage of Chemical Wastes.  A brief summary of the site arrangement should be as follows:

Storage Containers

·           Be suitable for the substance they are holding, resistant to corrosion, maintained in a good condition, and securely closed;

·           Have a capacity of less than 450L unless specifications have been approved by the EPD; and

·           Display a label in English and Chinese in accordance with instructions prescribed in Schedule 2 of the Regulations.

Storage Area

·           Be clearly labelled and used solely for the storage of chemical waste;

·           Be enclosed on at least 3 sides;

·           Have an impermeable floor and bunding, of a capacity to accommodate 110% of the volume of the largest container or 20% by volume of the chemical waste stored in that area, whichever is the greatest;

·           Have adequate ventilation;

·           Be covered to prevent rainfall entering (with water collected within the bund be disposed of as chemical waste when necessary); and

·           Be arranged so that incompatible materials are appropriately separated.

Disposal

·           Be collected by licensed chemical waste collector; and

·           Be disposed / transferred to a facility licensed to receive chemical waste, such as Chemical Waste Treatment Facility (CWTF) at Tsing Yi or other chemical waste recyclers.

6.3                            Staff Training

At the commencement of the construction works, training should be provided to workers on the concepts of site cleanliness and on appropriate waste management procedures, including waste reduction, reuse and recycling.

Location map and label showing different waste facilities on site will be provided at conspicuous locations to facilitate waste storage, segregation and recycling.

Tool box talk regarding waste management practices on site should be arranged on regular basis to maintain and / or improve site practices.

6.4                            Audit Requirements

In order to review the good site practices of waste management, regular audit and site inspection should be carried out by the ET to check whether the Contractor has implemented the recommended good site practices and other mitigation measures.  The inspection should look at all aspects of on-site waste management practices including waste generation, storage, recycling, transport and disposal.  Apart from site inspection, documents including licences, permits, disposal and recycling records should be reviewed and audited for compliance with the legislation and Contract requirements.  Designated staff of the Contractor responsible for resources allocation, staff training and controlling the relevant documents will also be interviewed to review the effectiveness of site management.

The requirements of the environmental audit programme were set out in Section 8 of the Manual.  The audit programme will verify the implementation status and evaluate the effectiveness and stability of the mitigation measures.

6.5                            Mitigation Measures

Good Site Practice

Under the condition of good site practices are strictly followed, it is anticipated that no adverse waste management related impacts would arise.  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 CWTF;

·           regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors;

·           implementation with 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. 19/2005 and submitted to the ER for approval.

Waste Reduction Measures

Good management and control can prevent 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 material and their proper disposal;

·           Encourage collection of aluminium cans and waste paper by individual collectors during construction with separate labelled bins being provided to allow the segregation of these wastes from other general refuse generated by the workforce;

·           Any unused chemicals and those with remaining functional capacity be recycled as far as possible;

·           Use of reusable non-timber formwork to reduce the amount of C&D materials;

·           Prior to disposal of construction waste, wood, steel and other metals should be separated, to the extent practical for re-use and/or recycling to reduce the quantity of waste to be disposed at landfills;

·           Proper storage and site practices to reduce the potential for damage or contamination of construction materials; and

·           Plan and stock construction materials carefully to reduce amount of waste generated and avoid unnecessary generation of waste.

Waste management approach recommended in the EIA Study is outlined in the Environmental Mitigation Implementation Schedule (EMIS) (Annex B).

In the event of complaints, or non-compliance / area of improvement is observed, the ET and the Contractor should be responsible for reviewing the effectiveness of these mitigation measures and for proposing to ER for approval, designing and implementing alternative or additional mitigation measures as appropriate.