6.                   WASTE MANAGEMENT IMPLICATIONS

Introduction

6.1               This section identifies the types of solid wastes that are likely to be generated during the construction and operation phases of the Project and evaluates the potential environmental impacts that may result from these wastes.  The major solid waste would be construction and demolition (C&D) material generated from excavation and slope works.  Wastes arising in the future, as with current operations, will be mainly general refuse and food and beverage waste from the visitors and staff.  Mitigation measures and good site practices, including waste handling, storage and disposal, are recommended with reference to the applicable waste legislation and guidelines.

Environmental Legislation, Policies, Plans, Standards and Criteria

6.2               The criteria and guidelines for assessing waste management implications are outlined in Annex 7 and Annex 15 of the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM), respectively.

6.3               The following legislation relates to the handling, treatment and disposal of wastes in the Hong Kong SAR and has been used in assessing potential impacts:

·     Waste Disposal Ordinance (Cap. 354)

·     Waste Disposal (Chemical Waste) (General) Regulation (Cap. 354)

·     Land (Miscellaneous Provisions) Ordinance (Cap. 28)

·     Public Health and Municipal Services Ordinance (Cap. 132) - Public Cleansing and Prevention of Nuisances Regulation

Waste Management

6.4               The Waste Disposal Ordinance (WDO) prohibits the unauthorised disposal of wastes.  Construction waste is defined as any substance, matter or thing that is generated from construction work and abandoned, whether or not it has been processed or stockpiled before being abandoned, but does not include any sludge, screenings or matter removed in or generated from any desludging, desilting or dredging works.  Under the WDO, wastes can be disposed of only at designated waste disposal facilities.

6.5               Under the WDO, the Chemical Waste (General) Regulation 1992 provides regulations for chemical waste control, and administers the possession, storage, collection, transport and disposal of chemical wastes.  The Environmental Protection Department (EPD) has also issued a ‘guideline’ document, the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes (1992), which details how the Contractor should comply with the regulations on chemical wastes.

6.6               The Public Cleansing and Prevention of Nuisances Regulation provides control on illegal tipping of wastes on unauthorised (unlicensed) sites.

Construction and Demolition (C&D) Materials

6.7               The current policy related to the dumping of C&D material is documented in the Works Branch Technical Circular No. 2/93, ‘Public Dumps’.  Construction and demolition materials that are wholly inert, namely public fill, should not be disposed of to landfill, but taken to public filling areas, which usually form part of reclamation schemes.  The Land (Miscellaneous Provisions) Ordinance requires that dumping licences be obtained by individuals or companies who deliver public fill to public filling areas.  The Civil Engineering & Development Department (CEDD) issues the licences under delegated powers from the Director of Lands. 

6.8               Under the Waste Disposal (Charges for Disposal of Construction Waste) Regulation, enacted in January 2006, construction waste delivered to a landfill for disposal must not contain more than 50% by weight of inert material.  Construction waste delivered to a sorting facility for disposal must contain more than 50% by weight of inert material, and construction waste delivered to a public fill reception facility for disposal must consist entirely of inert material.

6.9               Measures have been introduced under Environment, Transport and Works Bureau (ETWB) TCW No. 33/2002, “Management of Construction and Demolition Material Including Rock” to enhance the management of construction and demolition material, and to minimize its generation at source.  The enhancement measures include: (i) drawing up a Construction and Demolition Material Management Plan (C&DMMP) at the feasibility study or preliminary design stage to minimize C&D material generation and encourage proper management of such material; and (ii) providing the contractor with information from the C&DMMP in order to facilitate him in the preparation of the Waste Management Plan (WMP) and to minimize C&D material generation during construction.  Projects generating C&D material less than 50,000m3 or importing fill material less than 50,000m3 are exempt from the C&DMMP.  The new ETWB TCW No. 19/2005 “Environmental Management on Construction Sites” includes procedures on waste management requiring contractors to reduce the C&D material to be disposed of during the course of construction.  A Waste Management Plan should be submitted by the contractor prior to the commencement of construction works. 

Assessment Methodology

6.10            The criteria for assessing waste management implications are outlined in Annex 7 of the EIAO-TM.  The methods for assessing potential waste management impacts during the construction phase follow those presented in Annex 15 of the EIAO-TM and include the following:

§         Estimation of the types and quantities of the wastes generated.

§         Assessment of potential impacts from the management of solid waste with respect to potential hazards, air and odour emissions, noise, wastewater discharges and transport.

§         Assessment of impacts on the capacity of waste collection, transfer and disposal facilities.

Identification and Evaluation of Environmental Impacts

Construction Phase

6.11            The construction activities to be carried out for the proposed Project would generate a variety of wastes that can be divided into distinct categories based on their composition and ultimate method of disposal.  The identified waste types include:

§         Construction and demolition (C&D) materials

§         General refuse

§         Chemical waste

6.12            Each type of waste arising is described below, together with an evaluation of the potential environmental impacts associated with generation, handling, storage and transport of the waste.

Construction and Demolition Material

6.13            Construction and demolition (C&D) material would be generated from site formation (for Park expansion) and tunnel construction (for the funicular train).  The C&D material would comprise mostly rock (majority of volcanic rock), with an estimated total volume of approximately 1,328,500 m3.  A breakdown of the C&D material generated from the various works items of the Project is given in Table 6.1. The amount of C&D material to be generated would be quantified in the site Waste Management Plan to be prepared by the Contractor. 

6.14            The C&D material should be re-used on-site as far as possible to minimize the net amount of C&D material generated from the Project.  Given that the expansion and reconstruction works for the Project would mainly involve demolition, excavation and cutting works, it is expected that only a limited amount of C&D material (less than 5%) could be reused on-site as backfill material and for landscaping works.  The volume of surplus C&D material requiring disposal off-site is thus approximately 1,317,900 m3.  It is expected that imported general fill would not be required for general filling purpose. 

6.15            The proposed Project would generate about 42,750 m3 of C&D waste which is to be disposed of at the designated landfill site.  The C&D waste generated would mainly comprise the vegetation cleared from the New Headland area, the existing Headland area and the Lowland area, and the waste from the demolition and decommissioning of the existing facilities.  Metals should be separated from the C&D waste for recycling as far as possible, in particular steel which has re-sale value.

6.16            The proposed Project would generate about 998,850 m3 of rock material, mainly from the site formation for the proposed New Headland area and the formation of the funicular tunnel.  The rock material generated is volcanic in nature and therefore is not suitable to be used as concrete aggregates for construction purposes.  However, the rock material generated could be re-used for reclamation or rock fill by other projects either in the HKSAR or elsewhere.  At the very initial stage of the planning for the proposed Project, consideration had also been given to re-use the rock material in reclamation and site formation projects in the Mainland since the local reclamation and site formation projects would not be able to accept all this surplus rock material from the proposed Project.  Following the signing of the “Implementation Scheme on Hong Kong Disposal of Inert C&D materials in the Mainland” between the HKSAR and the Mainland, the disposal of surplus inert C&D material to the Mainland is expected to be via the official channel coordinated by the Government of the HKSAR. 

6.17            To the extent that Government can accommodate the material volumes generated, the surplus rock and other inert C&D material will be disposed of at the Government’s public fill reception facilities, for beneficial use by other projects in the HKSAR, or further disposed of in the Mainland for use by other suitable projects in the Mainland.  It is understood that Government will provide two public fill reception facilities (PFRF) for such disposal by vessels.  Government advises that disposal of material to PFRFs should be considered as last resorts with the preferred approach to reuse the material within the Project or in other projects.  Proponents would also explore appropriate contracts either in Mainland China or Macau for the use of material.  In both cases, the proponent shall be required to procure the appropriate licences for the export of material from EPD.  In the event that OPC are not able to find suitable receptor sites or secure the necessary licences, OPC shall review its schedule for the excavation for this Project. 

6.18            If inert C&D Material is to be delivered to the public fill reception facilities (PFRFs) by vessels, prior approval is required and the following conditions will apply.  The proponent should further liaise with the Secretary of the Public Fill Committee and shall take account of these in formulating its approach to disposal of excavated material, and on the overall programme of the Redevelopment. 

          Material delivered should be of size less than 250mm or other sizes as agreed with the Secretary of the Public Fill Committee and free from non-inert construction waste; 

          Receipt of material will be subject to the availability of the berthing spaces at the PFRFs;   

          PFRFs at Tseung Kwan O and Tuen Mun would allow for only one berthing space each to handle material from the Ocean Park Redevelopment project until March 2008;  

          Unloading the materials from vessels to the designated seafront loading area at each PFRF would be the responsibility of the Proponent. 

          Unloading of vessels would only be allowed at the designated seafront loading area at Tuen Mun PFRF between 8:30a.m. and 4:00 p.m., and at Tseung Kwan O PFRF between 8:00a.m. and 6:00p.m.  Vessels shall leave PFRFs by 4:00p.m. at Tuen Mun and 6:00 p.m. at Tseung Kwan O even when they have not yet unloaded all materials.  Vessels shall not be allowed to berth at PFRFs overnight.

          Unloading of barges would be suspended 1 hour after the hoisting of tropical cyclone warning signal No. 1.  Reception services shall be resumed within 24 hours after the lowering of all tropical cyclone warning signals.

          Unloading of barges would also be suspended at Tuen Mun PFRF at times when visibility is less than 0.5 nautical mile. 

6.19            Once sufficient working benches have been developed it would be necessary to increase the maximum weekly production to around 6,000 m3 per day.  To achieve a crushing and conveying rate of 6,000 m3 per day, it would necessary to operate the mobile crusher(s) for a minimum of eleven hours per day during the period of maximum rock production.  Maintaining this level of production would be dependent on the availability of a consistent level of barging services and acceptable receptor sites.  It is understood that these services would be unavailable once Typhoon Signal 1 is hoisted (through to lowering of all typhoon signals) or in the case of low visibility.  Since there are no mooring facilities available at the Site, blasting, excavation and crushing activities would be suspended once the working benches are filled. 

6.20            The majority of the surplus C&D material, about 1,317,900 m3, would come from the site formation work for the New Headland area.  To handle and dispose of such large quantity of surplus C&D material offsite from the New Headland area, with least environmental impacts, a conveyor belt system would be used.  The rock debris, after processing/ crushing will either be directly loaded onto the conveyor belt system or transferred to the conveyor via a vertical shaft (“the glory hole”) down to the conveyor running within a section of horizontal tunnel, which would then export the material to the barging point (refer to Figure 3.4-3.6).  For either option, the conveyor belt system will convey the excavated material from the top of the New Headland area down to the seafront at Tai Shue Wan, where a barging point would be erected for receiving the excavated material from the conveyor belt system.  A temporary stockpiling area would be provided at the newly formed platforms at the Headland in case the disposal of rock materials to local projects or CEDD’s Fill Bank is disrupted.  The indicative routing of the proposed conveyor belt to be used for the transfer of excavated material from the headland expansion area to the proposed barging point at Tai Shue Wan is indicated on Figure 3.4.

6.21            To further minimize the environmental impacts due to dust and noise, the conveyor belt system would be fully enclosed.  The barging point would also be equipped with water spray to suppress dust generation as illustrated in Figure 3.6.  The barges, loaded with excavated material, would transport the excavated material to the public fill reception points by sea.

6.22            The throughput for the excavation at the New Headland area would depend on the blasting design and the construction programme requirements.  It is expected that the throughput could reach as high as about 6,000 m3 per day.  Assuming that each barge would be able to receive about 800 m3 per day of excavated material, about 8 barge loads would be required per day for disposal of the excavated material from the New Headland area on these days with throughput reaching about 6,000 m3 per day.  The frequency of the barges for transporting the excavated material is on average one barge per hour.

6.23            For the excavation work for the funicular tunnel, the normal throughput of the excavated material is about 100 m3 per day for each excavation face.  Since one of the portals of the funicular tunnel is located at the Lowland area and the other portal is at an elevation much higher than the elevation of the conveyor belt system, the excavated material for the funicular tunnel would be disposed of off-site by dump trucks to public fill reception facilities.  At each excavation face, the average frequency for the dump trucks (4 to 5 m3 capacity) for the disposal of the excavated material for funicular tunnel would be about 20 to 25 truck loads per day, or about 3 trucks per hour.  The traffic impact of 3 trucks per hour on Nam Long Shan Road and Wong Chuk Hang Road would be expected to be minimal to either road. The estimated timing of the generation of C&D material and C&D waste from the various work items throughout the construction programme is shown in Table 6.2.

6.24            Since the construction activities would be located near the coast, improper management of C&D materials may introduce debris and pollutants to the coastal waters, and mitigation measures, including adoption of good site practices, would be required for control of impacts.

Table 6.1          Summary of C&D Material Volumes

 

Works Item

Excavated rock (m3)

 

Artificial hard material (m3)

Material other than rock & artificial hard material(1) (m3)

Total C&D material (m3)

C&D material to be reused on site (m3)

C&D material to be delivered to public filling areas

(m3)

C&D waste to be delivered to landfill site(2)

(m3)

New Headland

Site Formation

891,000

500

44,500

936,000

0

936,000

30,000

Slopeworks

19,000

0

1,000

20,000

0

20,000

0

Existing Headland

Demolition

0

20,000

0

20,000

0

20,000

5,000

Site Formation

34,000

0

136,000

170,000

5,000

165,000

0

Slopeworks

1,200

0

4,800

6,000

0

6,000

0

Lowland

Demolition

0

72,000

0

72,000

0

72,000

7,500

Site Formation

10,000

0

40,000

50,000

5,500

44,500

0

Slopeworks

400

0

1,600

2,000

0

2,000

0

Funicular Tunnel

Excavation

43,250

0

1,750

45,000

0

45,000

0

Tai Shue Wan

Demolition

0

7,500

0

7,500

100

7,400

250

 

 

 

 

 

 

 

 

Total

998,850

100,000

229,650

1,328,500

10,600

1,317,900

42,750

Note:

(1)           The type of material other than rock & artificial hard material comprises mainly soil, topsoil and other unsuitable inert materials such as decomposed volcanic rock.

(2)           The quantity of C&D waste of 42,750 m3 is additional to the total quantity of C&D material of 1,328,500 m3.  The C&D waste represents non-inert waste material comprising vegetation cleared from the New Headland area, the existing Headland area and the Lowland area, and the waste from the demolition and decommissioning of the existing facilities.


Table 6.2          Estimated Timing of C&D Material and C&D Waste Generation

 

 

2006

2007

2008

Month

7-9

10-12

1-3

4-6

7-9

10-12

1-3

4-6

7-9

10-12

 

 

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

New Headland Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

500

9,500

 

 

5,000

219,500

 

10,000

219,500

 

10,000

234,500

 

5,000

236,500

 

6,000

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

10,000

 

 

20,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Existing Headland

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10,000

15,000

40,000

 

C&D Waste

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2,500

Lowland

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

50,000

 

 

14,500

11,800

2,000

 

18,000

5,700

 

7,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

2,000

 

 

2,000

 

 

1,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Funicular Tunnel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

1,000

10,750

 

750

11,500

 

 

11,500

 

 

9,500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tai Shue Wan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

7,500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

250

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2009

2010

Month

1-3

4-6

7-9

10-12

1-3

4-6

7-9

10-12

 

 

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

Rock

AHM

Others

New Headland Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Existing Headland

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

15,200

5,000

45,800

10,000

 

55,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

2,500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lowland

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

 

 

 

 

 

7,000

500

2,700

500

3,800

 

 

 

 

 

 

 

 

500

 

C&D Waste

 

 

 

 

 

 

 

 

 

 

 

1,500

 

 

500

 

 

 

 

 

 

 

 

500

Funicular Tunnel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tai Shue Wan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C&D Waste

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:

(1)  Volumes are in m3            

(2)  AHM = Artificial hard material

 

 

 

 


General Refuse

6.25            The construction workforce would generate refuse comprising food scraps, waste paper, empty containers, etc.  Such refuse should be properly managed so intentional or accidental release to the surrounding environment does not occur.  Disposal of refuse at sites other than approved waste transfer or disposal facilities shall be prohibited.  Effective collection of site wastes would be required to prevent waste materials being blown around by wind, flushed or leached into the marine environment, or creating an odour nuisance or pest and vermin problem. Waste storage areas should be well maintained and cleaned regularly.  With the implementation of good waste management practices at the site, adverse environmental impacts are not expected to arise from the storage, handling and transportation of workforce wastes.  The maximum number of construction workers to be employed is estimated to be about 2,000 workers.  Based on a generation rate of 0.65 kg per worker per day, the maximum daily arising of general refuse during the construction period would be approximately 1,300 kg and this waste can be effectively controlled by normal measures.

Chemical Waste

6.26            The maintenance and servicing of construction plant and equipment may generate some chemical wastes such as cleaning fluids, solvents, lubrication oil and fuel.  Maintenance of vehicles may also involve the use of a variety of chemicals, oil and lubricants.  It is difficult to quantify the amount of chemical waste that will arise from the construction activities since it will be dependent on the Contractor’s on-site maintenance requirements and the amount of plant utilised.  However, it is anticipated that the quantity of chemical waste, such as lubricating oil and solvent produced from plant maintenance, would be small and in the order of a few cubic metres per month.  The amount of chemical waste to be generated will be quantified in the site Waste Management Plan to be prepared by the Contractor.

6.27            Chemical wastes arising during the construction phase may pose environmental, health and safety hazards if not stored and disposed of in an appropriate manner as stipulated in the Waste Disposal (Chemical Waste) (General) Regulations. The potential hazards include:

§         Toxic effects to workers

§         Adverse impacts on water quality from spills

§         Fire hazards.

6.28            Materials classified as chemical wastes will require special handling and storage arrangements before removal for appropriate treatment at the approved Chemical Waste Treatment Facility.  Wherever possible opportunities should be taken to reuse and recycle materials.  Mitigation and control requirements for chemical wastes are detailed in Section 6.38.  Provided that the handling, storage and disposal of chemical wastes are in accordance with these requirements, adverse environmental impacts are not expected to result.

Operation Phase

Types of Waste Arising

6.29            The main waste type generated during the existing operation of the Park is general refuse (from site operations and general services) and food and beverage waste (from catering services).  Other waste materials currently generated during the park operation include chemical waste, biological waste (clinical waste and expired drugs) and occasionally an animal carcass.   Chemical waste is generated by the cable car ride (lubrication oil and kerosene), rides maintenance (lubrication oil), aquarium (lubrication oil), life support system (lubrication oil and thinner), veterinary hospital (x-ray developer) and the environmental laboratory (spent acid, alkali, phenol and organic solvent).

6.30            The increase in quantity of general refuse and food and beverage waste would be proportional to the estimated increase in visitor and staff numbers following redevelopment of the Park.  Based on the available records of existing waste quantities, the estimated future waste quantity of general refuse and food and beverage waste is indicated in Table 6.3, and represents an increase of approximately 30%.  The disposal of future waste generated at the Park would follow the existing handling and disposal arrangements as indicated in Table 6.3.

Table 6.3          Summary of Waste Materials Produced During Park Operation

Waste Material Type

Existing Annual Quantity (kg)

Future Annual Quantity (kg) 6

Handling & Disposal Route

General Refuse 1

4,450,000 kg

 

12,200 kg/day

(0.382 kg/person/day)

 

 

15,950 kg/day

Landfill

Landscaping Waste 1

920,000 kg

 

Recycling and surplus disposed to landfill.

Food & Beverage Waste 1

1,500 kg/day

(0.047 kg/person/day)

 

1,960 kg/day

Landfill

Chemical Waste 2

8362 kg

 

approx 23 kg/day

12,500 kg

 

approx 34 kg/day

Waste bags collected by a registered collector.

Biological Waste – Clinical Waste from Clinical Laboratory, Veterinary Hospital 3

797 kg

1,000 kg

Clinical waste storage room at new Veterinary Hospital (waste is autoclaved or chemically disinfected as far as practicable).

 

Waste bags collected every two weeks from designated Refuse Collection Point at Veterinary Hospital by a registered clinical waste collector.

 

Disposed to landfill.

Biological Waste – Expired Drugs 4

7 kg

11 kg

Drug disposal licence obtained from EPD.

Collection is called as required. Disposed to Chemical Waste Treatment Facility.

Animal Carcass 5

2 tonnes per month

 

 

3,750 kg

Two freezers for storage of carcasses.

 

Collection by registered waste collector is called as required. Permit obtained from EPD for disposal to landfill.

Notes:

1.    Quantity of general refuse, food & beverage waste and landscaping waste based on records for the period July 2004 – July 2005

2.    Quantity of chemical waste based on records for the period July 2004 – June 2005

3.    Quantity of clinical waste based on records for the period January 2004 – December 2004

4.    Quantity of expired drugs is the average quantity collected during the four collection events during the period 31/1/2001 - 26/4/2005.

5.    Disposal quantity of 2 tonnes per month is the maximum quantity permitted in the permit issued by EPD for the disposal at landfill of disinfected animal carcass parts, classified as “special waste”, for the period 17/12/2004 – 16/6/2005

6.    Future annual quantities of General Refuse and Food & Beverage Waste based on increase in visitor numbers from 4.0 M per year (existing) to 5.05M per year (ultimate scenario for 2010/11), and increase in staff numbers from 900 per day (existing) to 1,750 per day (ultimate scenario).  Daily peak visitor numbers predicted to increase from 31,000 (existing) to 40,000 (ultimate scenario).

7.    Future estimates of the annual quantities of chemical wastes, biological wastes and animal carcass provided by Ocean Park.

 

Mitigation of Adverse Environmental Impacts

Good Site Practices

6.31            Adverse impacts related to waste management are not expected to arise, provided that good site practices are strictly followed.  Recommendations for good site practices during the construction activities include:

§         Nomination of an approved person, 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 and chemical handling procedures

§         Provision of sufficient waste disposal points and regular collection of waste

§         Appropriate measures to minimise windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers

§         Regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors.

Waste Reduction Measures

6.32            Good management and control can prevent the generation of a 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:

§         Sort C&D waste from demolition and decommissioning of the existing facilities to recover recyclable portions such as metals

§         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

§         Encourage collection of aluminium cans by providing separate labelled bins to enable this waste to be segregated from other general refuse generated by the work force

§         Proper storage and site practices to minimise the potential for damage or contamination of construction materials

§         Plan and stock construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste.

6.33            In addition to the above measures, specific mitigation measures are recommended below for the identified waste arising to minimise environmental impacts during handling, transportation and disposal of these wastes.

General Refuse

6.34            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.  Preferably an enclosed and covered area should be provided to reduce the occurrence of 'wind blown' light material. 

Construction and Demolition Material

6.35            In order to minimise impacts resulting from collection and transportation of C&D material for off-site disposal, the excavated materials arising from site formation and tunnel construction should be reused on-site as backfilling material and for landscaping works as far as practicable.  In addition, volcanic rock generated from the site formation and tunnelling works should be disposed of at public fill areas for other beneficial uses.  Other mitigation requirements are listed below:

§         A Waste Management Plan should be prepared.

§         A recording system for the amount of wastes generated, recycled and disposed (including the disposal sites) should be proposed.

§         In order to monitor the disposal of C&D and solid wastes at public filling facilities and landfills, and to control fly-tipping, a trip-ticket system (e.g. ETWB TCW No. 31/2004) should be included.

Chemical Wastes

6.36            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 explosive, flammable, oxidizing, irritant, toxic, harmful, corrosive, etc.  The Contractor shall use a licensed collector to transport and dispose of the chemical wastes, to either the approved Chemical Waste Treatment Centre, or another licensed facility, in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.

6.37            Table 6.4 provides a summary of the various waste types likely to be generated during the construction activities for the redevelopment of the Park, together with the recommended handling and disposal methods.

Table 6.4          Summary of Waste Handling Procedures and Disposal Routes

Waste Material Type

Generated from works item

Total Quantity Generated

Quantity to be disposed off-site

Disposal

Handling

C&D Material

Site formation; 

Construction of tunnel for Funicular Train

 

1,328,500 m3

 

1,317,900 m3

To be reused on-site (10,600 m3)

 

To be disposed to public fill reception points for other beneficial uses (1,317,900 m3)

 

To be disposed to landfill  (42,750 m3)

Segregate volcanic rock to avoid contamination from other waste.

Covered conveyor belt to transfer C&D material to barging point

General Refuse

Waste paper, discarded containers, etc. generated from workforce