10 EM&A Requirement and Implementation of mitigation

10.1 EM&A Requirement

The assessments presented in the preceding sections have predicted that the implementation of the Project is not expected to give rise to any adverse environmental impacts. A focused EM&A programme is considered appropriate to ensure that the proposed mitigation measures are effectively implemented and the quality of the surrounding environment is not prejudiced.

10.1.1 Construction Phase

In general, in view of the nature and small scale of the Project, no environmental monitoring is required during construction except water quality monitoring during dredging works and dolphin monitoring during underwater percussive piling works, the details of which is provided in the following section.

Joint environmental audit at the site by CAPCO staff and the Contractor is recommended during construction to ensure the implementation of proper handling and treatment of the construction waste generated from the Project. Details of water quality monitoring and dolphin monitoring are described as below.

Water Quality Monitoring

Monitoring Parameters

The parameters to be measured in situ include:

· dissolved oxygen (DO) (% saturation and mg L^-1);

· temperature;

· turbidity (NTU); and

· salinity (‰or ppt).

The only parameter to be measured in the laboratory includes suspended solids (SS) (mg L^-1).

In addition to the water quality parameters, other relevant data should also be measured and recorded in field logs, including the location of the sampling stations and grab dredger at the time of sampling, water depth, time, weather conditions, sea conditions, tidal state, current direction and speed, special phenomena and work activities undertaken around the monitoring and works area that may influence the monitoring results.

Monitoring Equipment and Methodology

For water quality monitoring, the following equipment should be supplied and used by the environmental contractor.

· Dissolved Oxygen and Temperature Measuring Equipment - The instrument should be a portable, weatherproof dissolved oxygen measuring instrument complete with cable, sensor, comprehensive operation manuals, and should be operable from a DC power source. It should be capable of measuring: dissolved oxygen levels in the range of 0–20 mg L^-1 and 0-200% saturation; and a temperature of 0-45 degrees Celsius.

It should have a membrane electrode with automatic temperature compensation complete with a cable of not less than 35 m in length. Sufficient stocks of spare electrodes and cable should be available for replacement where necessary (for example, YSI model 59 meter, YSI 5739 probe, YSI 5795A submersible stirrer with reel and cable or an approved similar instrument).

Turbidity Measurement Equipment - Turbidity should be measured in situ by the nephelometric method. The instrument should be portable and weatherproof using a DC power source complete with cable, sensor and comprehensive operation manuals. It should have a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU (for example, Hach model 2100P or an approved similar instrument). The cable should not be less than 25m in length. The meter should be calibrated in order to establish the relationship between NTU units and the levels of suspended solids. The turbidity measurement should be carried out on a split water sample from the same water sample collected for suspended solids analysis.

· Salinity Measurement Instrument - A portable salinometer capable of measuring salinity in the range of 0-40 ppm should be provided for measuring salinity of the water at each monitoring location.

· Water Depth Detector - A portable, battery-operated echo sounder should be used for the determination of water depth at each designated monitoring station. A detector affixed to the bottom of the work boat, if the same vessel is to be used throughout the monitoring programme, is preferred.

· Current Velocity and Direction – No specific equipment is recommended for measuring the current velocity and direction. However, the environmental contractor should seek approval of their proposed equipment with the client prior to deployment.

· Positioning Device - A hand-held or boat-fixed type digital Global Positioning System (GPS) with way point bearing indication or other equipment instrument of similar accuracy, should be provided and used during water quality monitoring to ensure the monitoring vessel is at the correct location before taking measurements. GPS or the equivalent instrument, calibrated at appropriate checkpoint (e.g. Quarry Bay Survey Nail at Easting 840683.49, Northing 816709.55) should be provided and used to ensure the monitoring station is at the correct position before taking measurement and water samples.

· Water Sampling Equipment - A water sampler, consisting of a transparent PVC or glass cylinder of not less than two litres, which can be effectively sealed with cups at both ends, should be used (Kahlsico Water Sampler 13SWB203 or an approved similar instrument). The water sampler should have a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth.

All in situ monitoring instruments should be checked, calibrated and certified by a laboratory accredited under HOKLAS or any other international accreditation scheme before use, and subsequently re-calibrated at monthly intervals throughout all stages of the water quality monitoring. Responses of sensors and electrodes should be checked with certified standard solutions before each use. The turbidity meter should be calibrated to establish the relationship between turbidity readings (in NTU) and levels of SS (in mg L^-1) where possible.

For the on-site calibration of field equipment, the BS 1427: 1993, Guide to Field and On-Site Test Methods for the Analysis of Waters should be observed. Sufficient stocks of spare parts should be maintained for replacements when necessary. Backup monitoring equipment should also be made available so that monitoring can proceed uninterrupted even when equipment is under maintenance, calibration etc.

Water samples for SS measurements should be collected in high density polythene bottles, packed in ice (cooled to 4° C without being frozen), and delivered to a HOKLAS laboratory as soon as possible after collection.

All laboratory work should be carried out in a HOKLAS accredited laboratory. Water samples of about 1,000 mL should be collected at the monitoring and control stations for carrying out the laboratory determinations. The determination work should start within the next working day after collection of the water samples. The SS laboratory measurements should be provided to the client within 2 days of the sampling event (48 hours). The analyses should follow the standard methods as described in APHA Standard Methods for the Examination of Water and Wastewater, 19th Edition, unless otherwise specified (APHA 2540D for SS).

The submitted information should include pre-treatment procedures, instrument use, Quality Assurance/Quality Control (QA/QC) details (such as blank, spike recovery, number of duplicate samples per-batch etc), detection limits and accuracy. The QA/QC details should be in accordance with requirements of HOKLAS or another internationally accredited scheme.

Monitoring Stations

The monitoring station locations have been established to identify potential impacts to water quality sensitive receivers which are shown in Figure 5.2.

Prior to, during and after the dredging works, water quality sampling will be undertaken at stations situated around the dredging area. The monitoring at those stations is to ensure the dredging works of the Project do not affect the sensitive areas nearby (shown in Figure 10.1).

· C1 is a Control Station (during ebb tide) located to the north of the dredging area, which is not supposed to be influenced by the construction works;

· C2 is a Control Station (during flood tide) located to the south of the dredging area with the same coordinates as EPD routine monitoring station NM3, which is not supposed to be influenced by the construction works;

· SR1 and SR2 represent Lung Kwu Sheung Tan Beach and Lung Kwu Tan Beach respectively, located to the north of the dredging area;

· SR3, SR4 and SR5 represent the Castle Peak Power Station Intake, the Shiu Wing Steel Mill Intake and the EcoPark Intake, located to the south of the dredging area;

· SR6, SR7 and SR8 represent the eastern boundary of Sha Chau and Lung Kwu Chau Marine Park; and

· G1, and G2 are regarded as a Gradient Station in-between the dredging area and the Marine Park, whereas G1 situates at the same location as EPD routine monitoring station NM5.

The suggested co-ordinates of these monitoring stations are listed in Table 10.1.

The monitoring stations will be sampled during Baseline Monitoring (prior to the dredging works), Impact Monitoring (during any works related to the dredging works) and Post Project Monitoring (after completion of the dredging).

Table 10.1 Co-ordinates of Baseline, Impact & Post Project Monitoring Stations (HK Grid)

Station	Easting	Northing
C1	806561	829624
C2	811762	823728
SR1	808295	828795
SR2	809242	827496
SR3	809444	826076
SR4	810241	825355
SR5	810763	825047
SR6	806198	827886
SR7	806959	824749
SR8	807571	822187
G1	807729	826440
G2	808608	824832

Monitoring Frequency

For baseline, impact and post-project monitoring, monitoring should be undertaken 3 days per week, at mid-flood and mid-ebb tides, with sampling/ measurement at the designated stations. The intervals between 2 consecutive sets of monitoring should not be less than 36 hours except where there are exceedances of Action and/or Limit Level, in which case monitoring frequency should be increased. The tidal range for each of the flood and ebb tide should not be less than 0.5m.

The water quality sampling will be undertaken within a 3-hour window of 1.5 hour before and 1.5 hour after mid flood and mid-ebb tides. The environmental contractor will be responsible for liaison with the engineering contractor to confirm whether dredging works are being undertaken during the water quality sampling.

Each station will be sampled and measurements will be taken at three depths, 1 m below the sea surface, mid depth and 1m above the sea bed. For stations that are less than 3 m in depth, only the mid depth sample should be taken.

Replicate in-situ measurements and sample collected from each independent sampling event are required for all parameters to ensure a robust statistically interpretable dataset.

Baseline Monitoring: Baseline Monitoring will comprise sampling 3 days a week, at mid-flood and mid-ebb tides, for at least 4 weeks prior to the commencement of the dredging works. The monitoring will be undertaken at twelve locations in total (two control, five impact and two gradient monitoring stations), as shown on Figure 10.1. The baseline monitoring schedule should be provided to EPD for agreement at least 2 weeks prior to commencement of the baseline monitoring work.

Impact Monitoring: Impact Monitoring will comprise sampling 3 days a week, at mid-flood and mid-ebb tides, during the dredging works. Samples should be taken at the same location as the Baseline Monitoring Stations. The monitoring schedule should be provided to EPD for agreement prior to commencement of the monitoring work.

Post Project Monitoring: Post Project Monitoring will comprise sampling on 3 days a week, at mid-flood and mid-ebb tides, for at least 4 weeks after completion of the dredging works at the same location as the Baseline Monitoring Stations.

Compliance / Action Event Plan

Water quality monitoring results will be evaluated against Action and Limit levels shown in Table 10.2.

Table 10.2 Action and Limit Levels for Water Quality (based on the Results of the Baseline Report)

Parameter	Action Level	Limit Level
SS in mg L^-1 (depth-averaged ^a) ^c	95%-ile of baseline data, and 20% exceedance of value at any impact station compared with corresponding data from control stations at the same tide of the same day ^d, e, f	99%-ile of baseline data, and 30% exceedance of value at any impact station compared with corresponding data from control stations at the same tide of the same day and specific sensitive receiver water quality requirements ^d, e, f
DO in mg L^-1 b	Surface and Middle 5%-ile of baseline data for surface and middle layer Bottom 5%-ile of baseline data for bottom layers	Surface and Middle 4mg L^-1 or 1%-ile of baseline for surface and middle layer Bottom 2mg L^-1 or 1%-ile of baseline data for bottom layer
Turbidity in NTU (depth-averaged ^a) ^c	95%-ile of baseline data, and 20% exceedance of value at any impact station compared with corresponding data from control stations at the same tide of the same day ^d. e	99%-ile of baseline data, and 30% exceedance of value at any impact station compared with corresponding data from control stations at the same tide of the same day ^d, e
Notes: (a) “Depth-averaged” is calculated by taking the arithmetic means of reading of all three depths. (b) For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits. (c) For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits. (d) An exceedance of Action Level and Limit Level is defined as exceeding both criteria. The comparison of the results of impact stations and control stations will aid to determine the background influence to the water quality sensitive receivers. (e) C1 is regarded as the Control Station during ebb tide, whereas C2 is regarded as the Control Station during flood tide. (f) For WSD and Black Point/Castle Peak Power Station intakes, the specific SS criteria are not greater than 20 mg L^-1 and 764 mg L^-1.

Actions to be taken in the event that the Action or Limit Levels are exceeded are shown in Table 10.3.

Table 10.3 Event and Action Plan for Water Quality

EVENT	ACTION
	ET	IEC	CAPCO	Contractor
Action Level being exceeded by one sampling day	1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC and the Contractor and CAPCO; 4. Check monitoring data, all plant, equipment and the Contractor’s working methods; 5. Discuss mitigation measures with the IEC and the Contractor;	1. Discuss with the ET and the Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the CAPCO accordingly; 3. Assess the effectiveness of the implemented mitigation measures.	1. Discuss with the IEC on the proposed mitigation measures; 2. Make agreement on the mitigation measures to be implemented.	1. Inform the CAPCO and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET and the IEC and propose mitigation measures to the IEC and the CAPCO; 6. Implement the agreed mitigation measures.
Action Level being exceeded by more than one consecutive sampling days	1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC and the Contractor and CAPCO; 4. Check monitoring data, all plant, equipment and Contractor’s working methods; 5. Discuss mitigation measures with the IEC and the Contractor; 6. Ensure mitigation measures are implemented;	1. Discuss with the ET and the Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the CAPCO accordingly; 3. Assess the effectiveness of the implemented mitigation measures.	1. Discuss with the IEC on the proposed mitigation measures; 2. Make agreement on the mitigation measures to be implemented; 3. Assess effectiveness of the implemented mitigation measures;	1. Inform the CAPCO and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET and the IEC and propose mitigation measures to the IEC and CAPCO within 3 working days; 6. Implement the agreed mitigation measures.
Limit Level being exceeded by one consecutive sampling day	1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC, the Contractor and the DEP; 4. Check monitoring data, all plant, equipment and the Contractor’s working methods; 5. Discuss mitigation measures with the IEC, the CAPCO and the Contractor; 6. Ensure mitigation measures are implemented;	1. Discuss with the ET / Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the CAPCO accordingly; 3. Assess the effectiveness of the implemented mitigation measures.	1. Discuss with the IEC, the ET and the Contractor on the proposed mitigation measures; 2. Request the Contractor to critically review the working methods; 3. Make agreement on the mitigation measures to be implemented; 4. Assess the effectiveness of the implemented mitigation measures.	1. Inform the Engineer and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET, the IEC and the CAPCO and propose mitigation measures to the IEC and the CAPCO within 3 working days; 6. Implement the agreed mitigation measures.
Limit Level being exceeded by more than one consecutive sampling days	1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC, the Contractor and DEP; 4. Check monitoring data, all plant, equipment and Contractor’s working methods; 5. Discuss mitigation measures with the IEC, the CAPCO and the Contractor; 6. Ensure mitigation measures are implemented;	1. Discuss with ET and Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the CAPCO accordingly; 3. Assess the effectiveness of the implemented mitigation measures.	1. Discuss with the IEC, the ET and the Contractor on the proposed mitigation measures; 2. Request Contractor to critically review working methods; 3. Make agreement on the mitigation measures to be implemented; 4. Assess effectiveness of the implemented mitigation measures; 5. Consider and instruct, if necessary, the Contractor to slow down or to stop all or part of the marine work until no exceedance of Limit Level.	1. Inform the CAPCO and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET, the IEC and the CAPCO and propose mitigation measures to the IEC and the CAPCO within 3 working days; 6. Implement the agreed mitigation measures; 7. As directed by the CAPCO, slow down or stop all or part of the construction activities.

Reporting

A letter report should be provided to CAPCO that should include the monitoring results in addition to operating practices of the dredging works during sampling (including position, quantity of dredged volume per day) and an interpretation of monitoring results. The monitoring data should be provided graphically to show the relationship between the Control and the Impact monitoring stations and compliance or non-compliance with respect to the Action and Limit Levels.

The reports to be provided by the environmental contractor/ET should include one Baseline Monitoring Report; Weekly Impact Monitoring Reports; and one Post Project Monitoring Report.

The ET should prepare and submit a Baseline Environmental Monitoring Report at least 1 month before commencement of impact monitoring. Copies of the Baseline Environmental Monitoring Report will be submitted to the following: the Contractor, the IEC, the CAPCO and the EPD. The ET will liaise with the relevant parties on the exact number of copies required.

A Monthly Impact Monitoring Report should be prepared by the ET and submitted to the Contractor, the IEC, the CAPCO and the EPD within 10 working days at the end of each reporting month.

The Post-Project Monitoring Report should be prepared by the ET and submitted to the Contractor, the IEC, the CAPCO and the EPD within one week of completion of the Post Project Survey.

The format of the reports should follow that specified in Technical Memorandum on EIA Process (EIAO, Cap. 499, S16), as appropriate.

Dolphin Monitoring

Visual dolphin monitoring should be conducted during the underwater percussive piling works to evaluate whether there have been any effects on the animals. A dolphin exclusion zone within a radius of 500 m from the works area during the construction phase. The exclusion zone around the work area should be scanned for at least 30 minutes prior to the commencement of piling. If cetaceans are observed in the exclusion zone, underwater percussive piling should be delayed until they have left the area.

The observer should stand at a location (eg the piling barge) that allows for an observation height of 4 to 5 m above water level at the observer’s eye level and relatively unobstructed forward visibility. Observation by the observer should be conducted by searching with Fujinon 7X50 marine binoculars or equivalent, scanning the area with the naked eye and occasional binocular check. The observer should remain alert at all times during the entire observation period.

A sighting record should be filled in immediately at the initial sighting with data on the time, position, distance and bearing of the sighting. All other information on sea state, weather conditions (ie wind speed according to the Beaufort Scale), as well as notes on dolphin appearance, behaviour, direction of movement, response to boat and any other relevant information can be completed at the end of the sighting.

When dolphins are spotted within the exclusion zone, construction works should cease and should not resume until the observer confirms that the zone has been continuously clear of dolphins for a period of 30 minutes (thereby adequately spanning the approximate maximum dive time of the dolphins of 4 minutes). Dolphin sighting position, data on sighting angle, distance to the group, group size and behaviour should be recorded.

The dolphin surveys will be required solely during underwater percussive piling works. Daily monitoring should be conducted till the completion of underwater percussive piling works.

10.1.2 Operational Phase

CAPCO implements a comprehensive environmental monitoring programme for the operations of the existing Castle Peak Power Station (CPPS) and it is considered that no additional EM&A activities are required for the emissions control operations.

The current operational environmental monitoring programmes for the CPPS that are relevant to the Project include:

Air

· Operation and maintenance of Continuous Emission Monitoring (CEM) System at the stack to continuously monitor the flue gas;

· Transmission of the on-line CEM data to EPD's office through a telemetry system;

· Operation and maintenance of an ambient air monitoring network at San Hui, Butterfly Estate and Lung Kwu Tan in Tuen Mun and Tin Shui Wai;

· Reporting of the stack sampling result, emission data and validated CEM data to EPD; and

· Reporting of the ambient air monitoring and dust monitoring results to EPD.

Water

· Monitoring of the quality of effluents discharged from the CPPS and ash lagoon;

· Monitoring of the quality of marine water around the ash lagoon; and

· Reporting of the wastewater and marine water monitoring results to EPD.

10.2 Implementation Schedule

Mitigation measures discussed in the preceding sections are summarised in the Implementation Schedule in Table 10.4.

Table 10.4 Implementation Schedule

EIA Ref.	Environmental Protection Measures	Location/Duration of Measures/Timing of Completion of Measures	Implementation Agent	Implementation Stage				Relevant Legislation & Guidelines
				Des	C	O	Dec
AIR QUALITY –CONSTRUCTION PHASE
S3.6.1	· The area at which demolition work takes place should be sprayed with water prior to, during and immediately after the demolition activities so as to maintain the entire surface wet	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· Dust screens or sheeting should be provided to enclose the structure to be demolished to a height of at least 1 m higher than the highest level of the structure;	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· Any dusty materials should be wetted with water to avoid any fugitive dust emission;	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· All temporary stockpiles should be wetted or covered by tarpaulin sheet to prevent fugitive emissions;	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· All the dusty areas and roads should be wetted with water;	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· All the dusty materials transported by lorries should be covered entirely by impervious sheet to avoid any leakage; and	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
S3.6.1	· The falling height of fill materials should be controlled.	Within the construction site/Throughout the construction period	Contractor		ü			Air Pollution Control (Construction Dust) Regulation
AIR QUALITY – OPERATIONAL PHASE Since the Project will significantly reduce SO2 and NOx emissions and further reduce particulate emissions from CPB, no mitigation measures are required.
NOISE – CONSTRUCTION PHASE The predicted noise levels are within the stipulated noise criterion as a result of the considerable separation distance plus topography and existing building structures at CPB located between the NSR and the Project. Mitigation measures are not required.
NOISE – OPERATIONAL PHASE The predicted noise levels are below the daytime and night-time criteria as a result of the considerable separation distance plus topography and existing building structures at CPB located between the NSR and the Project. Mitigation measures are not required.
WATER QUALITY – CONSTRUCTION PHASE
Marine-based Construction Activities
S5.8.1	· Silt curtains should be deployed around the closed grab dredger to contain suspended solids within the construction site during dredging.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· A daily dredging rate of a closed grab dredger (with a minimum grab size of 8 m^3) should be less than 5,200 m^3 day^-1, with reference to the maximum rate for dredging, which was derived in the EIA.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Mechanical grabs should be designed and maintained to avoid spillage and should seal tightly while being lifted.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Barges or hoppers should have tight fitting seals to their bottom openings to prevent leakage of material.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Loading of barges or hoppers should be controlled to prevent splashing of dredged material to the surrounding water.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Barges or hoppers should not be filled to a level which will cause overflow of materials or pollution of water during loading or transportation.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Excess material should be cleaned from the decks and exposed fittings of barges or hoppers before the vessel is moved.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· Adequate freeboard should be maintained on barges to reduce the likelihood of decks being washed by wave action.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· All vessels should be sized such that adequate clearance is maintained between vessels and the seabed at all states of the tide to ensure that undue turbidity is not generated by turbulence from vessel movement or propeller wash.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.1	· The works should not cause foam, oil, grease, litter or other objectionable matter to be present in the water within and adjacent to the works site.	Within the construction site/Throughout the construction period	Contractor		ü			-
Land-based - Construction Runoff
S5.8.2	· At the start of site establishment, perimeter cut-off drains to direct off-site water around the site should be constructed and internal drainage works and erosion and sedimentation control facilities implemented. Channels, earth bunds or sand bag barriers should be provided on site to direct stormwater to silt removal facilities. The design of efficient silt removal facilities should be based on the guidelines in Appendix A1 of ProPECC PN 1/94.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· All the surface runoff or extracted ground water contaminated by silt and suspended solids should be collected by the on-site drainage system and diverted through the silt traps prior to discharge into storm drain.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· All exposed earth areas should be completed as soon as possible after earthworks have been completed, or alternatively, within 14 days of the cessation of earthworks, where practicable. If excavation of soil cannot be avoided during the rainy season, or at any time of year when rainstorms are likely, exposed slope surfaces should be covered by tarpaulin or by other means.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· All drainage facilities and erosion and sediment control structures should be regularly inspected and maintained to ensure proper and efficient operation at all times and particularly following rainstorms. Deposited silt and grit should be removed regularly and disposed of by spreading evenly over stable, vegetated areas.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· Measures should be taken to reduce the ingress of site drainage into excavations. If the excavation of trenches in wet periods is necessary, they should be dug and backfilled in short sections wherever practicable. Water pumped out from trenches or foundation excavations should be discharged into storm drains via silt removal facilities.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· Open stockpiles of construction materials (for example, aggregates, sand and fill material) of more than 50 m^3 should be covered with tarpaulin or similar fabric during rainstorms. Measures should be taken to prevent the washing away of construction materials, soil, silt or debris into any drainage system.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· Manholes (including newly constructed ones) should always be adequately covered and temporarily sealed so as to prevent silt, construction materials or debris being washed into the drainage system.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· Precautions to be taken at any time of year when rainstorms are likely, actions to be taken when a rainstorm is imminent or forecasted, and actions to be taken during or after rainstorms are summarised in Appendix A2 of ProPECC PN 1/94. Particular attention should be paid to the control of silty surface runoff during storm events, especially for areas located near steep slopes.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· Oil interceptors should be provided in the drainage system and regularly emptied to prevent the release of oil and grease into the storm water drainage system after accidental spillages. The interceptor should have a bypass to prevent flushing during periods of heavy rain.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
S5.8.2	· All temporary and permanent drainage pipes and culverts provided to facilitate runoff discharge should be adequately designed for the controlled release of storm flows. All sediment traps should be regularly cleaned and maintained. The temporary diverted drainage should be reinstated to the original condition when the construction work has finished or the temporary diversion is no longer required.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
Wastewater from Site Facilities
S5.8.2	· Sewage from toilets should be collected by a licensed waste collector.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.2	· Vehicle and plant servicing areas, vehicle wash bays and lubrication bays should, as far as possible, be located within roofed areas. The drainage in these covered areas should be connected to foul sewers via a petrol interceptor.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.2	· Oil leakage or spillage should be contained and cleaned up immediately. Waste oil should be collected and stored for recycling or disposal, in accordance with the Waste Disposal Ordinance.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance
Storage and Handling of Oil, Other Petroleum Products and Chemicals
S5.8.2	· Waste streams classifiable as chemical wastes should be properly stored, collected and treated for compliance with Waste Disposal Ordinance or Disposal (Chemical Waste) (General) Regulation requirements.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance Disposal (Chemical Waste) (General) Regulation
S5.8.2	· All fuel tanks and chemical storage areas should be provided with locks and be sited on paved areas.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S5.8.2	· The storage areas should be surrounded by bunds with a capacity equal to 110% of the storage capacity of the largest tank to prevent spilled oil, fuel and chemicals from reaching the receiving waters.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S5.8.2	· The Contractors should prepare guidelines and procedures for immediate clean-up actions following any spillages of oil, fuel or chemicals.	Within the construction site/Throughout the construction period	Contractor		ü			-
S5.8.2	· Surface run-off from bunded areas should pass through oil/grease traps prior to discharge to the stormwater system.	Within the construction site/Throughout the construction period	Contractor		ü			EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
WATER QUALITY – OPERATIONAL PHASE
Limestone FGD Absorber Effluent
S5.9.2	It has predicted that the marine works and structures will have minimal effects on hydrodynamics and water quality. Mitigation measures are not considered to be necessary.	-	-					-
S5.9.2	The high degree of mixing inherent in the coastal margin or coastal zone will result in rapid dilution of the effluent to non-significant concentrations, and therefore mitigation measures are considered unnecessary.	-	-					-
Storage and Handling of Oil, Other Petroleum Products and Chemicals
S5.9.3	· Waste streams classifiable as chemical wastes should be properly stored, collected and treated for compliance with Waste Disposal Ordinance or Disposal (Chemical Waste) (General) Regulation requirements.	Within the Project Site/Throughout the operational years	CLP Power (as CAPCO operator)			ü		Waste Disposal Ordinance Disposal (Chemical Waste) (General) Regulation
S5.9.3	· All fuel tanks and chemical storage areas should be provided with locks and be sited on paved areas.	Within the Project Site/Throughout the operational years	CLP Power (as CAPCO operator)			ü		Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S5.9.3	· The storage areas should be surrounded by bunds with a capacity equal to 110% of the storage capacity of the largest tank to prevent spilled oil, fuel and chemicals from reaching the receiving waters.	Within the Project Site/Throughout the operational years	CLP Power (as CAPCO operator)			ü		Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S5.9.3	· The Contractors should prepare guidelines and procedures for immediate clean-up actions following any spillages of oil, fuel or chemicals.	Within the Project Site/Throughout the operational years	CLP Power (as CAPCO operator)			ü		-
S5.9.3	· Surface run-off from bunded areas should pass through oil/grease traps prior to discharge to the stormwater system.	Within the Project Site/Throughout the operational years	CLP Power (as CAPCO operator)			ü		EPD Practice Note for Professional Persons, Construction Site Drainage (ProPECC PN 1/94)
WASTE MANAGEMENT – CONSTRUCTION PHASE There are no major waste management issues associated with the operation of the new emission control system. This section recommends the mitigation measures to avoid or minimize potential adverse environmental impacts associated with handling, collection and disposal of waste arising from the construction of the new emission control system. It is the Contractor’s responsibility to ensure that only licensed chemical waste collectors are used for collection and transportation of chemical waste to the licensed disposal facility and that appropriate measures are taken to minimize adverse environmental impacts, including windblown litter and dust from the transportation of wastes. In addition, the Contractor must ensure that all the necessary waste permits are obtained for the construction and operational phases.
Dredged Sediments
S6.6.1	Dredged sediments should be disposed of only at designated disposal sites allocated by the Marine Fill Committee (MFC) based on the findings of further sediment quality tests. A dumping licence should also be obtained from EPD prior to the commencement of the dredging works.	Within designated disposal site/prior to commencement of the dredging works	Contractor		ü			Dumping at Sea Ordinance
S6.6.1	Regardless of the disposal method and site, the Contractor should: · Dredge the sediments using closed grabs; · Use split barges of not less than 750 m^3 capacity when transporting the sediment to the disposal site; · Regularly maintain the barge hoppers to ensure that they are capable of rapid opening and discharge at the designated disposal site; and · Monitor the barge load against loss of materials during transportation.	Within the dredging area /Throughout the dredging works period	Contractor		ü			Dumping at Sea Ordinance
C&D Materials
Management of Waste Disposal
S6.6.3	· The contractor should open a billing account with EPD in accordance with the Waste Disposal (Charges for Disposal of Construction Waste) Regulation for the payment of disposal charges. Every waste load transferred to government waste disposal facilities such as public fill, sorting facilities, landfills or transfer station would required a valid “chit” which contain the information of the account holder to facilitate waste transaction recording and billing to the waste producer. A trip-ticket system should also be established in accordance with Works Bureau Technical Circular No. 21/2002 to monitor the disposal of solid wastes at transfer station/landfills, and to control fly-tipping. The billing “chit” and trip-ticket system should be included as one of the contractual requirements and implemented by the contractor.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Charges for Disposal of Construction Waste) Regulation, December 2005 ETWBTC No 31/2004, Trip Ticket System for Disposal of Construction and Demolition Materials
S6.6.3	· A recording system for the amount of waste generated, recycled and disposed of (including the disposal sites) should be established during the construction stage.	Within the construction site/Throughout the construction period	Contractor		ü			ETWBTC No 31/2004, Trip Ticket System for Disposal of Construction and Demolition Materials
S 6.6.3	Measures for the Reduction of C&DM Generation during Planning and Design Stages The various waste management options can be categorized in terms of preference from an environmental viewpoint. The options considered to be more preferable have the least impacts and are more sustainable in the long term. Hence, the waste management hierarchy is as follows: · Avoidance and minimization, that is, reduction of waste generation through changing or improving practices and design; · Reuse of materials, thus avoiding disposal (generally with only limited reprocessing); · Recovery and recycling, thus avoiding disposal (although reprocessing may be required); and · Treatment and disposal, according to relevant law, regulations, guidelines and good practice. This hierarchy should be used to evaluate the waste management options, thus allowing maximum waste reduction and reduced disposal costs. Records of quantities of wastes generated, recycled and disposed (locations) should be kept.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance WBTC No. 25/99 Incorporation of Information on Construction and Demolition Material management in PWSC Papers
S6.6.3	Measures for the Reduction of C&DM Generation during Construction · C&D materials will be reused as far as possible within the Project. Public fill and construction waste should be segregated and stored in different containers or skips to facilitate reuse or recycling of materials and their proper disposal of construction waste. Specific areas of the work site should be designated for such segregation and temporary storage if immediate use is not practicable. · The construction waste should be collected by Contractor and transported to landfills for disposal. · The use of wooden hoardings should not be allowed. An alternative material, which can be reused or recycled, for example, metal (aluminium, alloy, etc) should be used. · To reduce the potential dust impact, C&D materials should be wetted as quickly as possible during excavation works.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance WBTC 32/92, The Use of Tropical Hard Wood on Construction Site WBTC No. 2/93, Public Dumps
Chemical Waste The Contractor should register as a chemical waste producer with the EPD. Chemical waste, as defined by Schedule 1 of the Waste Disposal (Chemical Waste) (General) Regulation, should be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes as follows:
S6.6.4	Containers used for storage of chemical wastes should: · 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 450 L unless the 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	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S6.6.4	The storage area for chemical wastes should: · 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 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 (water collected within the bund must be tested and disposed of as chemical waste, if necessary); and · be arranged so that incompatible materials are appropriately separated.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
S6.6.4	Disposal of chemical waste should be: · via a licensed waste collector; and · to a facility licensed to receive chemical waste, such as the Chemical Waste Treatment Facility which also offers a chemical waste collection service and can supply the necessary storage containers	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal (Chemical Waste) (General) Regulation Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes
Sewage
S6.6.5	· The sewage sludge from the portable toilet should be collected by a reputable collector on a regular basic.	Within the construction site/Throughout the construction period	Contractor		ü			-
General Refuse
S6.6.6	· General refuse should be stored in enclosed bins or compaction units separately from construction and chemical wastes.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance
S6.6.6	· General refuse should be removed from the site, separately from construction and chemical wastes, on a daily basis to minimise odour, pest and litter impacts.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance
S6.6.6	· Burning of refuse on construction site is prohibited by law.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance
S6.6.6	· Aluminium cans are often recovered from the waste stream by individual collectors if they are segregated and made easily accessible. As such, separate, labelled bins for their deposit should be provided if feasible. Materials recovered will be re-used on site or sold for recycling.	Within the construction site/Throughout the construction period	Contractor		ü			Waste Disposal Ordinance
Staff Training
S6.6.7	· Training should be provided to workers on the concepts of site cleanliness and on appropriate waste management procedures, including waste reduction, reuse and recycling at the beginning of the Contract.	Within the construction site/Throughout the construction period	Contractor		ü			-
LAND CONTAMINATION The following control measures should be implemented during the excavation of potentially contaminated soil and potentially contaminated groundwater:
Handling of potentially contaminated soil to be excavated
Annex E	· Potentially contaminated soil should be treated in accordance with the remediation actions specified in the Remediation Action Plan (RAP) of this EIA Report and the treated soil should be reused within the Project Site as far as possible.	Within the contaminated area /Throughout the construction period	Contractor		ü			EPD’s Guidance Notes for Investigation and Remediation of Contaminated Sites of petrol Filling Stations, Boatyards and Car Repairing/Dismantling Workshops
Annex E	· The temporary stockpile of excavated potentially contaminated materials should be contained in a container covered by HDPE sheet on top	Within the contaminated area /Throughout the construction period	Contractor		ü			EPD’s Guidance Notes for Investigation and Remediation of Contaminated Sites of petrol Filling Stations, Boatyards and Car Repairing/Dismantling Workshops
Annex E	· Bioremediation by applying nutrient to the soil should be employed for the on-site treatment of excavated materials potentially contaminated by TPH.	Within the contaminated area /Throughout the construction period	Contractor		ü			EPD’s Guidance Notes for Investigation and Remediation of Contaminated Sites of petrol Filling Stations, Boatyards and Car Repairing/Dismantling Workshops
Annex E	· If disposal of the treated excavated soil to the public fill bank is required, vehicles containing any excavated materials should be suitably covered to limit potential dust emissions or wastewater run-off, and truck bodies and tailgates will be sealed to minimise the risk of a discharge during transportation or during wet conditions.	Within the contaminated area /Throughout the construction period	Contractor		ü			EPD’s Guidance Notes for Investigation and Remediation of Contaminated Sites of petrol Filling Stations, Boatyards and Car Repairing/Dismantling Workshops
Annex E	· Records of the quantities of soil generated for off-site disposal will be maintained.	Within the contaminated area /Throughout the construction period	Contractor		ü			EPD’s Guidance Notes for Investigation and Remediation of Contaminated Sites of petrol Filling Stations, Boatyards and Car Repairing/Dismantling Workshops
Handling of potentially contaminated groundwater
Annex E	· As groundwater is not used for either domestic or industrial purposes at the site or in the adjacent areas, remediation of groundwater is not considered to be necessary for the Project to proceed. If groundwater is encountered during the construction of foundations, the groundwater abstracted or collected will be recharged back to the site.	Within the contaminated area /Throughout the construction period	Contractor		ü			Water Pollution Control Ordinance
Annex E	· The FODT and the oil separator serving it should be cleaned prior to demolition.	Within the contaminated area /Throughout the construction period	Contractor		ü			Water Pollution Control Ordinance
Annex E	· Oily water and sludge collected from the cleaning should be treated at the on-site wastewater treatment facility. Oily water and sludge collected from the cleaning should be collected and disposed of as chemical waste at Government chemical waste treatment facility.	Within the contaminated area /Throughout the construction period	Contractor		ü			Waste Disposal Ordinance (Cap 354) and Waste Disposal (Chemical Waste) (General) Regulation (Cap 354C)
Annex E	· Only licensed waste contractors should be used to collect and transport any chemical waste. The necessary waste disposal permits will be obtained, as required, from the appropriate authorities, in accordance with the Waste Disposal Ordinance (Cap 354) and Waste Disposal (Chemical Waste) (General) Regulation (Cap 354C), as required.	Within the contaminated area /Throughout the construction period	Contractor		ü			Waste Disposal Ordinance (Cap 354) and Waste Disposal (Chemical Waste) (General) Regulation (Cap 354C)
In order to minimise the contacts of the workers with the contaminated materials and to ensure safe work environments during the remediation works, the following safety measures are proposed
Annex E	· Prior to commence any remediation work, a health and safety risk assessment should be performed for the remediation work to identify potential work related hazards and prepare appropriate control measures.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· Appropriate Personal Protective Equipment (PPE) such as safety hat, chemical protective gloves, masks (for both dust and vapour), eye goggles, protective clothing and protective footwear should be provided to staff who would be involved in the tank cleaning and contaminated area (FODT and TP3) remediation works. No works should be allowed without the suitable PPE.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· The workers should inspect and check their PPE before, during and after use. In cases where any of the PPE is impaired, the workers should stop work immediately and inform their supervisor. The workers should not be allowed to re-start their work until the impaired PPE is replaced.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· The workers should always maintain basic hygiene standard (e.g. hand wash before leaving the contaminated work area). The workers should also be responsible for cleaning and storing their own PPE in a secure place before leaving the site.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· Eating, drinking and smoking should be strictly prohibited within the contaminated site area.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· The designated site management representatives must be informed if any workers feel uncomfortable physically or mentally during the remediation works. All workers should leave the work areas and the work should be temporarily suspended until the reason for the uncomfortable feeling has been identified.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· The works should be stopped or discontinued when Typhoon Signal No. 3 or Rainstorm Warning signals are hoisted. All stockpile materials (if any) should be covered immediately by tarpaulin or other similar protective and waterproof materials.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
Annex E	· Bulk earth-moving excavator equipment should be used to minimise construction workers’ potential contact with contaminated materials.	Within the contaminated area /Throughout the construction period	Contractor		ü			Heath and safety controls as stipulated under the Factories and Undertakings Ordinance and Occupational Safety and Health Regulation
ECOLOGICAL IMPACT – CONSTRUCTION AND OPERATIONAL PHASES In accordance with the guidelines in the EIAO-TM on marine ecology impact assessment, the general policy for mitigating impacts to marine ecological resources, in order of priority, are:
Measures for Marine Mammals
S8.9	The following recommendations should be considered to minimize potential construction and operation impacts on dolphins and porpoises. · All vessel operators working on the Project construction or operation should be given a briefing, alerting them to the possible presence of dolphins in the area, and the guidelines for safe vessel operation in the presence of cetaceans. If high speed vessels are used, they should be required to slow to 10 knots when passing through a high density dolphin area (west Lantau, Sha Chau and Lung Kwu Chau); · The vessel operators should be required to use predefined and regular routes, as these will become known to dolphins using these waters; · The vessel operators should be required to control and manage all effluent from vessels; · A policy of no dumping of rubbish, food, oil, or chemicals should be strictly enforced. This should also be covered in the contractor briefings; · Every attempt should be made to minimize the effects of construction of the Project on the water quality of the area;	Within the marine works area /Throughout the construction period /Operation of the additional berthing facility	Contractor / CLP Power (as CAPCO operator)		ü	ü		-
S8.9	To limit potential impacts to cetaceans from underwater percussive piling, the following steps should be taken: · Quieter hydraulic hammers should be used instead of the noisier diesel hammers; · An exclusion zone of 500 m radius should be scanned around the work area for at least 30 minutes prior to the start of piling. If cetaceans are observed in the exclusion zone, piling should be delayed until they have left the area; and, · Acoustic decoupling of noisy equipment on work barges should be undertaken. These techniques include the use of a soft sling to retain the pile driving hammer, rubber tyred air compressor for bubble jacket/curtain, rubber pads on barge leaders and guides, and an air curtain around the pile barge.	Within the dredging area /Throughout the construction period	Contractor		ü			-
VISUAL – CONSTRUCTION PHASE
S9.3.5	The new structures associated with the Project, including those of the additional conveyor systems, should be painted in a colour scheme that complements the surrounding industrial setting of the existing CPPS.	New structures associated with the Project	Contractor		ü			-
VISUAL – OPERATIONAL PHASE No mitigation measures are required.

Des=Design; C=Construction; O=Operation; Dec=Decommissioning