4        WASTE MANAGEMENT PROCEDURE

 

The quantities of disposal C&D materials will be recorded under the barcode Trip Ticket System by using the CHIT tickets.  CHIT will be presented to the landfill site as part of the system for the disposal charging scheme which had already been officially effective in January 2006.  Waste transaction records could be obtained either in the waste disposal facilities right after the transaction or retrieved from the Environmental Protection Department bill statement each month.

 

4.1   Acceptance Criteria for the Government Disposal Facilities

 

According to the Highways Department’s Memo ref.: (2NQ9) in Highways Department 7/10/1 dated 15 July 2010, the new WAC (as Tabulated below) became effective from 29 December 2010.

 

 

Table 4.1: New Waste Acceptance Criteria

 

CHEC will comply with the acceptance criteria laid down by the operators of the corresponding fill bank(s) and landfill(s), as outlined below:

 

4.1.1    Acceptance Criteria for Tuen Mun Area 38 Fill Bank (TM 38) or Tseng Kwan O Area 137 Fill Bank (TKO 137)

 

Ÿ             The truck driver should bear a duly completed, signed and stamped CHIT;

Ÿ             The dump truck should also have a valid Dumping Licence issued by Civil Engineering and Development Department, dump trucks without Dumping Licences will be rejected;

Ÿ             The inert C&D materials to be delivered to the fill bank(s) should be in accordance with the conditions stipulated in the Dumping Licence;

Ÿ             Any over-sized inert C&D materials should be broken down to less than 250mm in size so as to facilitate reuse by other reclamation or earth-filling projects;

Ÿ             The C&D materials to be disposed should consist entirely of inert construction waste (i.e. 100% inert construction waste); and

Ÿ             According to the Highways Department’s Memo ref.: (32FV) in Highways Department 7/8/13 dated 25 June 2010, the bituminous material is required to be separated from other inert construction and demolition (C&D) materials for disposal prior to delivery to the PFRF.

 

4.1.2    Acceptance Criteria for Northeast New Territories Landfill (NENT)

 

Ÿ             The truck driver should bear a duly completed, signed and stamped CHIT;

Ÿ             The dump truck should also have a valid Dumping Licence issued by Civil Engineering and Development Department, dump trucks without Dumping Licences will be rejected;

Ÿ             The non-inert C&D waste to be delivered to the landfills should be in accordance with the conditions stipulated in the Dumping Licence;

Ÿ             Construction waste should contained not more than 50% by weight of inert C&D waste (Gazette Notice G.N. 4272 published on 27 June 2008);

Ÿ             For a load of C&D waste not consisting entirely of bamboo, plywood or timber delivered by a vehicle, the weight of the waste divided by the permitted gross vehicle weight of the vehicle must not greater than 0.25 for goods vehicle with demountable skip and 0.2 for other types of vehicle (Gazette Notice G.N. 4272 published on 27 June 2008);

Ÿ             For a load of C&D waste consisting entirely of bamboo, timber or plywood delivered by a vehicle, there is no restriction on the weight of the waste divided by the permitted gross vehicle weight of the vehicle (Gazette Notice G.N. 4272 published on 27 June 2008);

Ÿ             Mixed C&D materials should be sorted at source to reduce the inert content as far as practicable to meet the above criteria before they are delivered to landfills;

Ÿ             C&D waste delivered for landfill disposal should contain no free water and the liquid content will not exceed 70% by weight;

Ÿ             At least one week’s notice, including contractors name and contact details etc, will be submitted to the Environmental Protection Department before commencing delivery of C&D waste to the landfills.  Environmental Protection Department will be informed of any subsequent change to the disposal programme.

4.2   Procedures of the Trip Ticket System

 

China Harbour Engineering Co., Ltd. (CHEC) will implement a Trip Ticket System (TTS) to track the disposal of C&D materials. Under the TTS, each truck carrying C&D materials leaving the Site for a disposal ground will bear a duly completed and stamped CHIT Tickets. The C&D materials must be disposed of at the disposal grounds as stipulated in the CHIT Tickets.

 

The Trip Ticket System will be executed according to the following procedures:

 

Ÿ             The General Foremen / Foremen will arrange the C&D waste to be sorted on site.  He will also check the total actual amount of cumulated C&D waste after the completion of the particular works in the working area.

Ÿ             If the sorted C&D waste is less than 1/3 of truckload, then the C&D waste will be transferred to the temporary holding area in CHEC’s works area for temporary stockpiling.

Ÿ             The C&D waste will be sorted and stored separately in different storage areas.

Ÿ             Non-inert C&D waste will be stored in storage tanks properly covered with tarpaulin sheeting in the temporary holding area.  Inert C&D materials will be stored on the ground properly covered with tarpaulin sheeting in the temporary holding area.  Larvicidal oil or larvicide will be applied onto the stored C&D waste, if necessary.

Ÿ             For every 7 days or one truckload collected, the stored non-inert C&D waste in the temporary holding area will be transferred to the designated landfills.

Ÿ             For every 14 days or one truckload collected, the stored inert C&D waste in the temporary holding area will be transferred to the designated fill banks.

Ÿ             If the sorted C&D waste is more than 1/3 of truckload, then the Foreman will arrange disposal of the C&D waste to designated fill banks / landfills.

Ÿ             For each truckload of C&D materials leaving the working area / temporary holding area to the designated fill banks / landfills, the truck driver must bear a duly completed and signed CHIT.

Ÿ             The General Foreman / Foremen will check, record with photo and ensure the dump truck is not overloaded by the electronic dump truck self-scale and the materials / waste are properly covered, a several weight buffer is allowed to prevent overloading.

Ÿ             The General Foreman / Foremen will fill in and sign the Part 1 of the Daily Record Summary (Appendix D) and submit to the Engineer’s supervisory staff.

Ÿ             The Engineer’s supervisory staff will cross check the dump truck loading and coverage and sign the Part 1 of the Daily Record Summary (Appendix D) for endorsement, and a duplicate and a copy of Daily Record Summary will give to the Engineer’s supervisory before departure of the truck.

Ÿ             After that, the General Foreman / Foremen will give the duly completed and signed CHIT to the truck driver.

Ÿ             The truck will proceed to the disposal ground as stipulated in the CHIT.  The truck driver will present the CHIT to the reception facility operator.  If the C&D waste accords with the acceptance criteria, disposal of the C&D waste will be permitted and the facility operator will give the truck driver a transaction receipt and the CHIT.

Ÿ             The truck driver will present the CHIT at the in-weighbridge of the disposal facilities.  If the vehicle load is accepted, the CHIT is deemed to be used and the in-weight would be recorded on the “Transaction Record Slip”.

Ÿ             If the truck driver is instructed by the reception facility operator to go to the sorting facility.  The driver will need to return back to the site and report to the General Foreman / Foremen.  No driver is allowed to go to sorting facility.

Ÿ             The truck driver will then return the transaction receipt and the stamped CHIT to CHEC as soon as possible.

Ÿ             CHEC will maintain a daily record disposal of C&D materials from the Site including details of the C&D waste, the truck number, departure time, etc, and notify the Engineer’s Representative in case any discrepancy is noted.

Ÿ             For disposal at government disposal facilities, CHEC will check the information recorded in the Daily Record Summary against the disposal records in Civil Engineering and Development Department’s website (http:www.cedd.gov.hk/eng/services/tripticket/index.html) or Environmental Protection Department’s website (http://www.epd.gov.hk/epd/misc/cdm/trip.htm) and complete Part 2 of the DRS for submission to the Engineer’s Representative within 3 working days after the day of disposal.

Ÿ             Where an irregularity is observed or when requested by the Engineer’s Representative under special circumstances (e.g. a CHIT has been issued but there is no disposal record at the designated disposal facilities), CHEC will submit to the Engineer’s Representative within 5 working days after the recorded date of disposal the supporting evidence such as duly stamped CHIT and/or the transaction receipt (where relevant) to confirm proper completion of the delivery trips in question, or within 2 working days after the Engineer’s Representative has requested for such evidence, whichever is later.  A fax copy of the CHIT and transaction receipt is acceptable, unless otherwise directed by the Engineer’s Representative.  CHEC will maintain all records on the CHIT for at least one year or other period as may be directed by the Engineer’s Representative.

 

4.3   Measures to be implemented during transportation of wastes to avoid leakage of wastes on public areas

 

Ÿ             All of the dump trucks used would be equipped with mechanical covers in which maintained in a good condition.

Ÿ             In order to minimize the leaking of material from the dump trucks, no material should be stored higher than the trail board.

Ÿ             Deposited silt and wastes on all dump trucks’ wheels and bodies should be properly washed off by wheel washing facilities before leaving the constructions sites.

Ÿ             CHEC will provide wheel washing facilities on site at the site entrance.

 

4.4   Disposal of C&D Materials to Alternative Disposal Ground(s)

 

Where CHEC has identified a project that can be an alternative disposal ground, CHEC will provide a detailed description of the alternative disposal ground, including location, lot number (where appropriate) and location plan(s) to the Engineer to request for his written approval.

 

Where the alternative disposal ground is a private construction project, CHEC will submit a letter from the Authorized Person of the development (as defined under the Building Ordinance) to confirm that:

 

Ÿ             The C&D materials for use in the development is acceptable;

Ÿ             The use of land so formed by the C&D materials is in conformity with the statutory town plan/ lease conditions;

Ÿ             The Engineer’s Representative are allowed to enter the alternative ground to conduct inspection where necessary; and

Ÿ             The estimated quantity and type of C&D materials to be used in the construction works and the approximate delivery programme, together with the name, post and specimen signature of the competent person to sign the DDF/ internal trip ticket stipulated in G.S. Clause 25.25(6)(a)(ii).

 

Where the alternative disposal ground is a private land but not a construction site, CHEC will submit a letter from the relevant authorities, such as the Lands Department and the Planning Department, to confirm that the suitability of the alternative disposal ground in receiving the proposed amount of C&D materials for use, and a written consent from the landowner.

 

Where the alternative disposal ground is a government project, CHEC will submit written consent from the project office of the alternative disposal ground to use the C&D materials generated from the Site, and to confirm the estimated quantity and type of C&D materials required and the approximate delivery programme.

 

A system for transmitting disposal records from the alternative disposal ground will be submitted to the Engineer’s Representative for approval before disposal to the alternative ground starts.

 

4.5   Chemical Waste/ Hazardous Waste Handling and Disposal

 

Chemical waste that is produced, as defined by Schedule 1 of the Waste Disposal (Chemical Waste) (General) Regulation, will be handled in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes as follows:

 

4.5.1    Packaging

 

Chemical waste will be packed and held in containers of suitable design and construction so as to prevent leakage, spillage or escape of the contents under normal conditions of handling, storage and transport.

Containers used for the storage of chemical wastes will:

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

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

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

 

4.5.2    Labelling

 

Every container of chemical waste will bear an appropriate label which will contain the particulars details. The waste producer will ensure that the information contained on the label is accurate and sufficient so as to enable proper and safe handling, storage and transport of the chemical waste.

 

4.5.3    Storage

 

The storage area will be specially constructed and bunded, and located close to the source of waste generation.

The storage area for chemical wastes will:

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

Ÿ             Be enclosed on at least 3 sides;

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

Ÿ             Have adequate ventilation;

Ÿ             Be covered to prevent rainfall entering (water collected with the bund must be tested and disposed of as chemical waste); and

Ÿ             Be arranged so that incompatible materials are adequately separated.

Ÿ             Before reaching 80% capacity of the storage container, licensed waste collectors will be employed to remove the chemical waste.

 

4.5.4    Transportation and Disposal

 

After the chemical wastes have been packed, labeled, and stored, the chemical wastes will be transported by licensed waste collectors and disposed of at Chemical Waste Treatment Facility in Tsing Yi or other approved facilities.

 

4.6   General Refuse

 

Measures to be implemented to encourage waste avoidance/ minimization include:

Ÿ             Reducing the number of photos copies to a minimum and by copying on both sides of paper for internal documents and external documents where appropriate;

Ÿ             Preventing over-ordering of office equipment and consumables;

Ÿ             Procuring green office equipment and consumables in terms of energy efficiency, recycled content and durability, etc;

Ÿ             Deploying sufficient recycle bins in site offices to facilitate collection of recyclables including wasted aluminum cans, plastics bottles and papers;

Ÿ             Deploying sufficient collection bins with cover at convenient locations at site to facilitate collection of non-recyclable for disposal at landfills; and

Ÿ             General refuse generated from working vessels and barges can dispose the waste into temporary waste collection point.

 

4.7   Sewage

 

For sewage collection will be by holding tank to be pumped out at regular interval and ensuring no adverse water impacts by contracting with licensed contractors to collect sewage and maintain the facilities.

Handling of sewage in terms sewage generated by human, adequate chemical toilets would be provided for collection.

 

Sufficient numbers of chemical toilets for workers and frontier workforces were placed on works area other than site offices.

 

4.8   Marine Mud

 

In order to recycle and reuse of the marine mud, a Cement Solidification/ Stabilization of Marine Mud technique will be applied and the treated materials will be re-used on-site as wither backfill or landscaping.

 

For handling the marine mud, follow measures will be implemented:

 

Ÿ             Location and size of any temporary stockpiles of materials, including excavated material, within the Site shall be as agreed by the Engineer. Stockpiles shall be maintained in a stable condition.

Ÿ             Temporary stockpiling site(s) of any untreated marine mud or other potentially contaminated materials (e.g. solidified mix that have not complied with the Treatment Targets) shall be lined with impermeable sheeting, bunded and with proper leachate control measures implemented;

Ÿ             Watering shall be avoided on temporary stockpiles of untreated marine mud or other potentially contaminated materials to minimize potential contaminated runoff. Such temporary stockpiles shall be properly covered by impermeable sheeting;

Ÿ             Vehicles containing any untreated/ treated marine mud shall be suitably covered to limit potential dust emissions or potential contaminated wastewater run-off, and truck bodies and tailgates should be sealed to prevent any discharge during transport or during wet conditions;

Ÿ             Temporary stockpiling of untreated marine mud or other potential contaminated materials shall be carried out during dry season or with suitable shelters/covers to minimize generation of potential contaminated runoff;

Ÿ             The mixing unit and any unloading/ loading areas of excavated marine mud shall be enclosed to minimize dust emissions;

Ÿ             Handling and mixing of cement shall follow Air Pollution Control (Construction Dust) Regulation to avoid fugitive dust emissions.

Ÿ             Impermeable materials (e.g. concrete paved ground) shall be placed at the bottom of mixing unit/ curing area for the duration of the Cement S/S treatment process;

Ÿ             Any in-ground pit, if used for the Cement S/S process, shall be shallower than the water table to minimize the potential leaching of the excavated marine mud into underlying soils and groundwater; and

Ÿ             Concrete bund shall be constructed as appropriate, along the perimeter of the Cement S/ S treatment facility(s) to prevent leachate from escaping out of the facility(s).

 

4.9   Use of Timber

 

CHEC aims to avoid, reduce or minimize the use of timber in temporary construction activities. Where the use of timber is unavoidable for temporary works construction processes or activities with an estimated quantity of greater than 5m³, CHEC will submit a method statement to the ER for agreement before starting the relevant temporary works. The method statement will include the justifications for the use and the measures taken to minimize the use of timber.

 

The summary table of timber usage will be updated and submitted to the ER for monitoring and review by not later than the 15^th day of each month or, if it is a general holiday, the day following the general holiday, or a day agreed upon with the ER.

 

4.10 Handling of Recyclables

 

Before starting the transportation of recyclable materials off site to recycling facilities,

CHEC will meet with recycling contractors to establish a suitable system for collecting recyclable materials with care.

 

4.11 Estimated Quantities of C&D Material/ Waste

 

The following types of waste would be generated from the works areas and the workforce on site.

 

Ÿ             C&D materials / waste;

Ÿ             Excavated sediments;

Ÿ             Chemical waste;

Ÿ             General refuse; and

Ÿ             Recyclable waste

 

Table 4.2 Table for Estimated Quantities of C&D Material/ Waste