12 IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION MEASURES

Table 12.1 Implementation Schedule for Land Contamination Measures

EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Des	De	Ex	Tre	Relevant Legislation and Guidelines
	Excavation and decontamination works
S3.7.9, S.3.7.15,S.3.9.15.	l Personal protective equipment (PPE) shall be used by site workers during soil excavation / free product skimming.	Excavation zones / During excavation	Contractor			Ö	Ö
S3.8.17- S3.7.20	l When free product is detected at groundwater surface during excavation, the free product shall be skimmed off, drummed properly, stored in a designated drum storage area with containment and collected by a licensed chemical waste collector for proper disposal.	Excavation zones / During excavation	Contactor			Ö
S.3.9.1	l All contaminated soil within the Project area shall be excavated and treated on-site at a centralized decontamination works area located at the northern part of the south apron.	Excavation zones / During excavation	Contractor	Ö		Ö	Ö
S3.9.7 -S3.9.10	l After excavation, confirmation sampling and testing shall be conducted to ensure complete excavation of contaminated soils.	Excavation zones / During excavation	Contractor	Ö		Ö
S3.9.6	l Contaminated soils shall be sorted and handled with respect of their contamination.	Excavation zones / During excavation	Contractor			Ö
S.3.9.15	l Health and safety plan for excavation shall be followed.	Excavation zones / During excavation	Contractor			Ö		l Occupational Safety & Health Ordinance, Occupational on Exposure
S3.9.16 - S3.9.41	l The following remediation processes shall be applied for different types of soil contamination: - Biopiling for TPH/VOCs/SVOC contamination; - Solidification/stabilization for metal contamination - Biopiling and solidification/stabilization for TPH and metal contamination	Decontamination works area / During excavation	Contractor	Ö		Ö	Ö
S3.11	To minimise the potentially adverse environmental impacts arising from the handling of potentially contaminated materials. *Free Product Recovery* l The skimmed free product should be drummed properly, stored in a designated drum storage area with containment and collected by a licensed chemical waste collector for proper disposal. The storage of skimmed free product should comply with the requirements in the Waste Disposal (Chemical Waste) (General) Regulation including the type of drum and containment measures. *Excavation and Transportation* l Excavation profiles must be properly designed and executed. l Stockpiling site(s) shall be lined with impermeable sheeting and bunded. Stockpiles shall be properly covered by impermeable sheeting to reduce dust emission. If this is not practicable due to frequent usage, regular misting shall be applied. Watering shall be avoided on stockpiles of contaminated soil to minimise contaminated runoff. l Stockpiles of contaminated soil should be properly covered by impermeable sheeting to minimize contaminated runoff from the stockpiles. l Excavation and stockpiling shall be carried out during dry season as far as possible to minimise contaminated runoff from contaminated soils. l Supply of suitable clean backfill material is needed after excavation. l Vehicles containing any excavated materials should be suitably covered to limit potential dust emissions or contaminated wastewater run-off, and truck bodies and tailgates should be sealed to prevent any discharge during transport or during wet conditions. l Speed control for the trucks carrying contaminated materials should be enforced; l Vehicle wheel and body washing facilities at the site’s exist points shall be established and used. *Biopiling* l To avoid fugitive emissions of dust or any air pollutants from the biopile(s) and to minimise runoff from the stockpiled soils, the stockpiled soils at the biopiles shall be covered by impermeable sheeting such that not longer than 5m of the biopile is exposed to open air. l Impermeable sheeting shall be placed at the bottom of the biopiles and leachate collection sump shall be constructed along the perimeter of the biopiles to prevent leachate from contaminating the underlying soil/groundwater. All leachate generated from the operation of biopiling shall be collected and recycled to the biopile. l The vented air from the biopile(s) shall be connected to blower and carbon adsorption system for treatment before release to the atmosphere. Exhaust air from the blower and carbon adsorption system shall be monitored for VOCs regularly. l Spend activated carbon of the carbon adsorption system shall be replaced at appropriate intervals such that the VOC emission rate from the system is acceptable. l Silencers shall be installed at the biopile blowers to minimise noise impact. l Contaminated runoff from biopile(s) shall be prevented by constructing a concrete bund along the perimeter of the biopiles. *Solidification / Stabilization* l Mixing process and other associated material handling activities should be properly scheduled to minimise potential noise impact. l Mixing of contaminated soils and cement / water / other additive(s) should be undertaken at a solidification plant to minimise the potential for leaching. l Runoff from the solidification / stabilization area should be prevented by constructing a concrete bund along the perimeter of the solidification / stabilization area. In order to minimise the potentially adverse effects on health and safety of construction workers during the course of site remediation, the Occupation Safety and Health Ordinance (OSHO) (Chapter 509) and its subsidiary Regulations shall be followed by all site personnel working on the site at all times. In addition, the following basic health and safety measures should be implemented as far as possible: l Set up a list of safety measures for site workers; l Provide written information and training on safety for site workers; l Keep a log-book and plan showing the contaminated zones and clean zones; l Maintain a hygienic working environment; l Avoid dust generation; l Provide face and respiratory protection gear to site workers; l Provide personal protective clothing (e.g. chemical resistant jackboot, liquid tight gloves) to site workers; and l Provide first aid training and materials to site workers.	Excavation zones and / During excavation, soil treatment Excavation zones and decontamination works area/ During excavation, soil treatment Excavation zones and decontamination works area/ During excavation, soil treatment Excavation zones and decontamination works area/ During excavation, soil treatment Excavation zones and decontamination works area/ During design decommissioning, excavation and soil treatment	Contractor Contractor Contractor Contractor	Ö Ö Ö Ö		Ö Ö	Ö Ö Ö	l Waste Disposal (Chemical Waste) (General) Regulation l Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes l Occupation Safety and Health Ordinance (OSHO) (Chapter 509) and its subsidiary Regulations.

^{* Des -
Design,}^De^-^{Decommissioning}^,^Ex^-^Excavation^,
and^Tre^-^{Soil
Treatment}

Table 12.2 Implementation Schedule for Waste Management Measures

EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Des	De	Ex	Tre	Relevant Legislation and Guidelines
S4.6.2	Good Site Practices Recommendations for good site practices during the decommissioning works include: l 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; l training of site personnel in proper waste management and chemical waste handling procedures; l provision of sufficient waste disposal points and regular collection for disposal; l appropriate measures to minimise windblown litter and dust during transportation of waste by either covering trucks or by transporting wastes in enclosed containers; l regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors; and l a recording system for the amount of wastes generated, recycled and disposed of (including the disposal sites).	Work site / During decommissioning	Contractor		Ö			l Waste Disposal Ordinance (Cap.354)
S4.6.3	Waste Reduction Measures 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: l sort C&D waste from demolition of the remaining structures to recover recyclable portions such as metals l 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; l to encourage collection of aluminium cans, PET bottles and paper by providing separate labelled bins to enable these wastes to be segregated from other general refuse generated by the work force; l any unused chemicals or those with remaining functional capacity shall be recycled; l proper storage and site practices to minimise the potential for damage or contamination of construction materials; and l plan and stock construction materials carefully to minimise amount of waste generated and avoid unnecessary generation of waste.	Work site / During design stage, decommissioning, excavation and soil treatment	Contractor	Ö	Ö	Ö	Ö
S4.6.4	Construction and Demolition Material l C&D material should be sorted on-site into inert C&D material (that is, public fill) and C&D waste. The inert C&D material would require disposal to the designated public fill reception facility. C&D material should be transported from the site by barge wherever possible to reduce environmental impacts associated with road transportation. C&D waste, such as steel and other metals should be re-used or recycled and, as a last resort, disposed of to landfill. It is recommended that a suitable area be designated to facilitate the sorting process and a temporary stockpiling area will be required for the separated materials	Work site / During decommissioning	Contractor		Ö			l ETWB TCW No. 33/2002, 31/2004, 19/2005
S4.6.5	l In order to monitor the disposal of public fill and C&D waste at the designated public fill reception facility and landfill, respectively, and to control fly tipping, a trip-ticket system should be included as one of the contractual requirements and implemented by an Environmental Team undertaking the Environmental Monitoring and Audit work. An Independent Environmental Checker should be responsible for auditing the results of the system	Work site / During decommissioning	Contractor and Independent Environmental Checker		Ö			l ETWB TCW No. 31/2004
S4.6.6	General Refuse l General refuse should be stored in enclosed bins or compaction units separate from C&D material. A licensed waste collector should be employed by the contractor to remove general refuse from the site, separately from C&D material. l Effective collection and storage methods (including enclosed and covered area) of site wastes would be required to prevent waste materials from being blown around by wind, wastewater discharge by flushing or leaching into the marine environment, or creating odour nuisance or pest and vermin problem..	Work site / During decommissioning, excavation and soil treatment	Contractor		Ö	Ö	Ö	l Public Health and Municipal Services Ordinance (Cap. 132)
S4.6.7	Chemical Wastes l After use, chemical wastes (for example, cleaning fluids, solvents, lubrication oil and fuel) should be handled according to the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes. Spent chemicals should be collected by a licensed collector for disposal at the CWTF or other licensed facility in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.	Work site / During decommissioning, excavation and soil treatment	Contractor		Ö	Ö	Ö	l Waste Disposal (Chemical Waste) (General) Regulation l Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes

* Des - Design, De - Decommissioning, Ex – Excavation, and Tre - Soil Treatment

Table 12.3 Implementation Schedule for Water Quality Measures

EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing			Implementation Agent		Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing			Implementation Agent		Des	De	Ex	Tre	Relevant Legislation and Guidelines
Decontamination Processes
S5.9.2	Soil Excavation l During excavation, all exposed pits shall be whenever possible backfilled immediately or covered. Where it is unavoidable to transiently pile up soils next to the excavation pit, the transient pile shall be bottom-lined, bunded and covered with impervious membrane during rain event in order to avoid generation of contaminated runoff.	Work site / During excavation		Contractor					Ö		l Water Pollution Control Ordinance (WPCO) lTechnical Memorandum on Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters (TM-DSS)
S5.9.3	l Final surfaces after excavation shall be well compacted and the subsequent permanent work or surface protection shall be carried out as soon as practical after the final surfaces are formed to prevent erosion caused by rainstorms. Appropriate intercepting channels and partial shelters shall be provided where necessary to prevent rainwater from collecting within trenches or footing excavations.	Work site / During excavation		Contractor					Ö		l WPCO, T-DSS

S5.9.4	Decontaminated Water and Wastewater from Wheel Washing l During excavation, dump trucks or excavators shall be decontaminated before they leave the site to ensure that no contaminated earth, mud or debris is deposited by them on roads. A wheel washing bay shall be provided at every site exit that equipped with an adequately sized centralized wastewater treatment unit. The wastewater treatment unit shall deploy suitable treatment processes to settle out sands/ silts with contaminants cohered and remove other contaminants in wheel washes and decontamination water. The polluting parameters in effluent of the wastewater treatment unit shall be in compliance with the discharge standards stipulated in the TM-DSS before the effluent being discharged into the storm drains. The installation and operation of the wastewater treatment unit shall be licensed and subject to the effluent monitoring as required under the WPCO which is under the ambit of regional office (RO) of EPD. In any case, discharge of wheel wash water shall be minimized and recycled where possible. The selection of construction road between the wheel washing bay and the public road should be paved with backfill to reduce vehicle tracking of soil and to prevent surface runoff from entering public road drains.	Work site / During excavation		Contractor					Ö		l WPCO, TM-DSS
S5.9.5	Operation of Solidification / Stabilization Facility l The solidification facility shall be sheltered and area of soil unloading / loading shall be provided with shed to avoid contaminated runoff. Excessive addition of water shall be avoided during the solidification process.	Decontamination works area / During soil treatment		Contractor						Ö	l WPCO, TM-DSS
S5.9.6	l Any pit used for solidification area shall be shallower than the water table to minimize the leaching of the contaminated soils. An impermeable membrane / sheet shall be placed at the bottom of any solidification pit during the solidification process.	Decontamination works area / During soil treatment		Contractor						Ö	l WPCO, TM-DSS
S5.9.7	l Any leachate generated from the solidification process shall be collected and treated in the centralized wastewater treatment unit before being discharged. The polluting parameters in effluent of the wastewater treatment unit shall be in compliance with the discharge standards stipulated in the TM-DSS before the effluent being discharged. The installation and operation of the wastewater treatment unit shall be licensed and subject to the effluent monitoring as required under the WPCO.	Decontamination works area / During soil treatment		Contractor						Ö	l WPCO, TM-DSS
S5.9.8	Operation of Biopiling l Iimpermeable liner shall be placed at the bottom of the biopiles and leachate collection sump shall be constructed along the perimeter of the biopiles to prevent leachate from contaminating the underlying soil/ groundwater. Concrete bund shall be constructed along the perimeter of biopiles to prevent the runoff coming out from the contaminated soil. Biopiles after formation and during rain shall be covered by anchored low permeability geotextiles to prevent contaminated runoff. It is proposed that the exposed biopile section at any time shall not be more than 5 m in length.	Decontamination works area / During soil treatment		Contractor						Ö	l WPCO, TM-DSS
S5.9.9	l All leachate generated from the operation of biopiling shall be collected and recycled to the biopile to avoid effluent discharge.	Decontamination works area / During soil treatment		Contractor						Ö	l WPCO, TM-DSS
S5.9.10	Groundwater Cleanup l Floating oil/free product (of TPH) has only been found in the apron area of the Ex-GFS site. It is proposed that where free product is detected at the groundwater surface at excavated area, only the free product shall be skimmed off from the water surface. The skimmed free product shall be drummed properly and collected by a licensed chemical waste collector for disposal. The storage of skimmed free product should comply with the requirements in the Waste Disposal (Chemical Waste) (General) Regulation including the type of drum and containment measures.	Work site / During excavation		Contractor					Ö		l WPCO, TM-DSS l Waste Disposal (Chemical Waste) (General) Regulation
S5.9.12	TPH Removal l Petrol interceptor should be adopted, where appropriate, as the first tier of treatment to removal TPH contaminant from contaminated runoff and effluent discharge from the decontamination works area.	Work site / During the decommissioning, excavation and soil treatment		Contractor				Ö	Ö	Ö	l WPCO, TM-DSS
S5.9.13	Failure of Centralized Wastewater Treatment Unit l In the event of wastewater treatment unit failure, all decontamination activities should be ceased to avoid emergency discharge.	Work site / During the decommissioning, excavation and soil treatment		Contractor				Ö	Ö	Ö	l WPCO, TM-DSS
Demolition Works
S5.9.15	l The site practices outlined in ProPECC PN 1/94 “Construction Site Drainage” should be followed as far as practicable in order to minimise surface runoff and the chance of erosion.	Work site / During decommissioning				Contractor		Ö			l WPCO, TM-DSS Practice Note for Professional Persons ProPECC PN 1/94
S5.9.16	l There is a need to apply to EPD for a discharge licence under the WPCO for discharging effluent from the construction site. The discharge quality is required to meet the requirements specified in the discharge licence. All the runoff, wastewater or extracted groundwater generated from the works areas should be treated so that it satisfies all the standards listed in the TM-DSS. Regular monitoring of the treated effluent quality from the centralized wastewater treatment unit and stormwater discharges from major storm outfalls within the works areas will be conducted. Monitoring parameters should constantly include SS, turbidity, oil and grease, COD and less frequently include TPH, BTEX and selected metals. Parameters included in the WPCO licence, will also be included in the monitoring programme. The chemical testing of water samples collected in the monitoring programme should be undertaken by a Hong Kong Laboratory Accreditation Scheme (HOKLAS) accredited laboratory. Detail monitoring programme / plan will be submitted at later stage for EPD's agreement.	Work site / During decommissioning				Contractor		Ö			l WPCO, TM-DSS
Sewage from Workforce
S5.9.17	l Temporary sanitary facilities, such as portable chemical toilets, should be employed on-site where necessary to handle sewage from the workforce. A licensed contractor would be responsible for appropriate disposal of waste matter and maintenance of these facilities.		Work site / During the decommissioning, excavation and soil treatment		Contractor			Ö	Ö	Ö	l WPCO, Waste Disposal Ordinance (WDO)
Accumulation of Solid Waste and Accidental Spillage
S5.9.18	l Debris and refuse generated on-site should be collected, handled and disposed of properly to avoid entering into the adjacent harbour waters. Stockpiles of cement and other construction materials should be kept covered when not being used.		Work site / During decommissioning, excavation and soil treatment		Contractor			Ö	Ö	Ö	l WDO l WPCO,
S5.9.19	l Oils and fuels should only be used and stored in designated areas which have pollution prevention facilities. To prevent spillage of fuels and solvents to the nearby harbour waters, all fuel tanks and storage areas should be provided with locks and be sited on sealed areas, within bunds of a capacity equal to 110% of the storage capacity of the largest tank. The bund should be drained of rainwater after a rain event.		Work site / During the decommissioning, excavation and soil treatment		Contractor			Ö	Ö	Ö	l WPCO l Waste Disposal (Chemical Waste) (General) Regulation l Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
Site Inspection
S5.11.1	Regular site inspections shall be undertaken to inspect the works areas in order to ensure that the recommended mitigation measures are properly implemented.	Work site / During decommissioning, excavation and soil treatment		Contractor				Ö	Ö	Ö	l WPCO, TM-DSS

* Des - Design, De - Decommissioning, Ex – Excavation, and Tre - Soil Treatment

Table 12.4 Implementation Schedule for Air Quality Measures

EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Implementation Stages*				Relevant Legislation and Guidelines
EIA Ref	Environmental Protection Measures / Mitigation Measures	Location / Timing	Implementation Agent	Des	De	Ex	Tre	Relevant Legislation and Guidelines
S.6.8.1	Good site practices to minimise dust and other air pollutants impacts during soil excavation, transportation, loading and unloading the excavated contaminated soils l Excavation profiles should be properly designed and executed. l The excavation area should be limited to as small in size as possible and backfilled with clean and/or treated soil shortly after excavation work. l The exposed excavated area shall be covered by the tarpaulin during night time. l The top layer soils shall be sprayed with fine misting of water immediately before the excavation. l Stockpiling site(s) shall be lined with impermeable sheeting and bunded. Stockpiles shall be properly covered by impermeable sheeting to reduce dust and other air pollutants emission. l Misting for the dusty material shall be carried out before being loaded into the vehicle. l Any vehicle with an open load carrying area shall have properly fitted side and tail boards. l Material having the potential to create dust shall not be loaded from a level higher than the side and tail boards and shall be dampened and covered by a clean tarpaulin.	Work site / During decommissioning, excavation and soil treatment	Contractor		Ö	Ö	Ö	l Air Pollution Control (Construction Dust) Regulation
	l The tarpaulin shall be properly secured and shall extent at least 300 mm over the edges of the sides and tailboards. The material shall also be dampened if necessary before transportation. l The vehicles shall be restricted to maximum speed of 10 km per hour and confined haulage and delivery vehicle to designated roadways insider the site. On-site unpaved roads shall be compacted and kept free of lose materials. l Vehicle washing facilities should be provided at every vehicle exit point. l The area where vehicle washing takes place and the section of the road between the washing facilities and the exit point should be paved with concrete, bituminous materials or hardcores. l Every main haul road should be scaled with concrete and kept clear of dusty materials or sprayed with water so as to maintain the entire road surface wet. l Every stock of more than 20 bags of cement should be covered entirely by impervious sheeting placed in an area sheltered on the top and the three sides. l Every vehicle should be washed to remove any dusty materials from its body and wheels before leaving the construction sites.
S6.8.3	Operation of solidification / Stabilization l The solidification pit/area shall be provided with dust suppression measures. l Handling and mixing of cement shall follow Air Pollution Control (Construction Dust) Regulation to limit cement emission. l The bin should be covered during residence period after mixing process. Operation of biopiling l During the course of biopile formation, the stockpiled soils at the biopiles shall be covered by tarpaulin or low permeable sheet to avoid fugitive emissions of dust or any air pollutants from the biopiles affecting the surrounding environment and to minimise runoff from the stockpiled soils. Biopile(s) shall be covered by impermeable sheeting (such that no longer than 5m of a biopile shall be exposed to open air) to avoid fugitive emissions of dust or any pollutants from the biopile(s). l Upon formation of a biopile, the biopile shall be covered by low permeable geotextiles to prevent dust emission and runoff. l During the operation of biopile, the biopiles shall be fully covered to control the extraction of VOCs.	Decontamination works area / During soil treatment Decontamination works area / During soil treatment	Contractor Contractor			Ö Ö	Ö Ö
	l Carbon absorber with 99% control efficiency shall be installed for the biopiling system to treat the off-gas prior to discharge and the location of the exhaust of the carbon filter should be sited as far away as possible from the nearby ASRs. l Spent activated carbon of the carbon absorber shall be replaced regularly such that the VOC emission rate from the system is acceptable (i.e. the measured TVOC is below 20 ppm). The carbon adsorption system should also be monitored regularly to check the performance of the carbon filter. l Gas samples at the exhaust of the carbon filter for VOCs should be monitored regularly. The biopile operation shall be terminated when unacceptable air quality is monitored at the site boundary. Resumption of biopiling will only be allowed after confirmation and implementation of appropriate mitigation measures.

^*^{Des
- Design,}^De^-^{Decommissioning}^,^Ex^–^Excavation^,
and^Tre^-^{Soil
Treatment}