In accordance with the EIA Study Brief (No. ESB-289/2015) issued under the Environmental Impact Assessment Ordinance (EIAO) for this Project, an assessment of the potential environmental impacts associated with construction, operation and decommissioning of the proposed Sewage Treatment Plant (STP) and effluent reuse facility has been conducted. Environmental issues covered in this EIA include:
● Air Quality Impact
● Noise Impact
● Water Quality Impact
● Waste Management Implication
● Ecological Impact
● Landscape and Visual Impact
The findings of this EIA study have determined the likely nature and extent of environmental impacts and identified environmental control measures for incorporation into the planning and design of the proposed STP and effluent reuse facility to ensure compliance with environmental legislation and standards during construction and operation phase. The implementation schedule for the recommended mitigation measures are presented in Chapter 11.
The conclusions of individual technical assessments are presented in Sections 9.3 to 9.8.
The EIA study for the proposed STP and effluent reuse facility has predicted that with implementation of the recommended mitigation measures, the Project would be environmentally acceptable to the surrounding population and environmental sensitive receivers. The key environmental outcomes accrued from the environmental considerations and analysis during the EIA process and the implementation of environmental control measures of the Project are summarised in the following sections.
The Project is located in close proximity to the following populations:
● Residents in Palm Springs protected from adverse air quality and noise impacts;
● Residents in Royal Palms protected from adverse air quality and noise impacts;
● Residents in Mai Po San Tsuen protected from adverse air quality and noise impacts; and
● Planned Residents within WSW Development protected from adverse air quality, noise, visual and water quality impacts.
Through the adoption of environmental designs as described below, the aforementioned populations have been protected from adverse environmental impacts.
Sensitive areas in the vicinity of the Project include:
● Wetland Conservation Area
● Wetland Buffer Area
● Wetland Restoration Area (within Wo Shang Wai Development)
● Mai Po Inner Deep Bay Ramsar Site
● Egretries
● Deep Bay Water Control Zone
The nature of this Project is to collect sewage from the WSW Development for treatment and reuse on-site. The Project on its own will be a protection measure to the aforementioned sensitive areas by preventing wastewater from the WSW Development to be discharged to the Deep Bay area. Consequently, the important habitats and wildlife of the Deep Bay region will be protected, which is also the underlying principle of the no net increase in pollution load to Deep Bay under the prevailing water quality control policy.
The Project is of small scale, and is only a temporary measure serving the WSW Development prior to the availability of public sewer, with minimal environmental impact. Nevertheless, environmentally friendly designs have been incorporated to minimise potential environmental impacts as far as practicable (subject to detailed designs):
● Use of reclaimed water for toilet flushing and landscape irrigation;
● Ventilation opening with noise reduction measures located away from noise sensitive receivers as far as possible;
● Selection of siting to minimise air, noise and visual impact to sensitive receivers; and
● Locate components of the project with potential odour impact underground.
The primary aim of this Project is to prevent increase of net pollution load to Deep Bay from the sewerage discharge within WSW Development. The Project will treat all sewerage generated from the WSW Development, for full reuse onsite and thereby avoiding impacts to the important habitats and wildlife in the Deep Bay region. Other environmental problems have also been avoided or minimised:
● Locating all components associated with the handling, treatment and storage of sewerage, reclaimed water and sludge underground, and hence minimising potential odour impact to nearby residents;
● Installation of deodorizer with at least 99.5% odour removal efficiency with forced ventilation system to remove odour, minimising potential odour impact to nearby residents;
● Integrate with the WSW Development basement, allowing tankers to collect sludge from the underground storage tank and leave the property through the basement access road, thereby minimising potential odour and noise impact to nearby residents;
● Minimise Project footprint by locating major components underground and avoid significant visual impacts, which also free up more space for landscaping;
● Use of sodium hypochlorite during treatment process rather than chlorine gas containers to avoid potential hazard to life impact;
● Reuse of inert construction and demolition (C&D) materials on-site as far as practicable to avoid off-site delivery of surplus inert C&D materials and associated environmental impacts; and
● Termination of STP operation only for decommissioning phase, thereby avoiding potential dust and noise impacts to nearby residents from demolition of facilities and potential accidental contamination of fresh water.
As mentioned in Section 2.2.1, the Project is located within the WSW Development and has been a construction site since Year 2010. Under the WSW Development EIA, Wetland Restoration Area had been proposed to compensate for ecological impacts. The WRA has been established, and will not be affected by this Project, as such, no further compensation is required.
Furthermore, compensatory measures had been proposed in the WSW Development EIA for mitigating landscape impacts. All felled trees within the WSW Development, which is also the location of this Project, will be compensated for. Hence, the Project will not cause further impacts that will require additional compensation.
In view of the above and given no impacts on environmentally sensitive area are expected, and the Project is located within the construction site of the WSW Development, no compensation has been proposed in this EIA.
In October 2013, the Project Proponent submitted a Section 16 (S16) Application for an amendment to the approved application No. A/YL-MP/185, and was approved in February 2015 (Application No. A/YL-MP/229). The proposed amendments under this S16 application included change in the master layout plan of the WSW Development (e.g., increased house numbers, relocation of clubhouse), revision to landscaping, and the interim on-site sewerage treatment facility.
The S16 application was made available for public inspection in accordance with statutory requirement. During the statutory publication period and the publication of further information, a total of 278 public comments were received, none of which objected the interim on-site sewerage treatment facility (i.e., this Project) element of the application. The objections received mainly concerned on potential adverse impact of the overall WSW Development, especially on the nearby wetland habitat, groundwater table, extra pollution loading to Deep Bay Area, surrounding traffic and road safety, sewage management and hygiene. The nature of this Project is to collect sewage from the WSW Development for on-site treatment and reuse. As detailed in the impact assessments in Chapter 3 to 8 have concluded that the Projects potential environmental impacts will not be significantly adverse. The mitigation measures proposed in this EIA study will alleviate potential environmental impacts to an acceptable level. Therefore, the potential impacts from relevant public concerns, such as impact to nearby habitats, is not expected.
Given the small scale and localized nature of the STP building construction works together with implementation of the recommended mitigation measures, no adverse air quality impacts on the surrounding ASRs are anticipated during the construction phase of the Project.
With proper operation of the proposed STP and effluent reuse facility, as well as the recommended odour containment and control measures in place to confine and reduce the potential odour emissions at sources, adverse odour impacts on the surrounding ASRs are not anticipated.
Construction works are expected to be of small scale and localized. Potential cumulative construction noise impacts from the construction of the proposed Project and the WSW Development have been identified and assessed. Under the consideration of the prevailing site condition with vertical noise barriers during the whole construction period of the proposed interim STP, no adverse construction noise impact is anticipated.
With the adoption of the maximum allowable sound power levels for the proposed STP, no exceedances in relevant noise criteria is expected. No adverse fixed noise impact during operation phase is anticipated.
A noise commissioning test should be conducted prior to the operation of the proposed STP and implemented as specified in the standalone Environmental Monitoring and Audit (EM&A) Manual.
For construction phase, potential water quality impacts, which are mainly land-based, have been identified which include construction site runoff, accidental spillage of chemicals, sewage from the construction workforce and general construction activities. With implementation of environmental best practices for construction site management as well as water pollution preventive and mitigation measures, no adverse water quality impacts are anticipated during construction phase.
For operation phase, potential water quality impacts identified include discharge of treated sewage, emergency discharge of untreated sewage, and use of reclaimed water onsite. The interim STP will employ Membrane Bioreactor technology to treat the sewage generated from the WSW development and the effluent will be further polished by disinfection to meet the WSD water reuse standards. With treatment to the required WSD reuse standards and full use of the reclaimed water at the WSW Development, alongside preventive and contingency measures for avoidance and minimisation of treated or untreated effluent discharge to Deep Bay, the Project would comply with the no net increase in pollution load requirement. In addition, preventive measures for cross-contamination and mis-use of reclaimed water will be implemented through engineering and management measures. Decommissioning of the onsite STP would not occur until all sewage from the WSW Development is fully diverted to the permanent Government sewers. With implementation of these recommended measures, no adverse water quality impacts would arise due to implementation of the Project.
The major waste types generated by the construction activities will include construction and demolition (C&D) materials from excavation works, foundation works, STP construction works; sediment from excavation works; chemical waste from maintenance and servicing of construction plant and equipment and general refuse from the workforce. Provided that all these identified wastes are handled, transported and disposed of in accordance with the relevant legislative and recommended requirements and the recommended good site practices and mitigation measures are properly implemented, no adverse environmental impact is expected during the construction phase.
During the operation phase, the waste types generated will be sewage sludge from the operation of the on-site STP, general refuse from staff, and chemical waste from regular maintenance activities. Provided that all these wastes are handled, transported and disposed of in accordance with the relevant legislative requirements and the recommended mitigation measures are properly implemented, no adverse environmental impact is expected during the operation phase.
The Project Site is currently a construction site dominated by developed area forming part of the WSW Development. No primary direct impact in terms of habitat loss is anticipated due to the Project. Due to the current residential development in WSW, the grassland and wetland habitats existed within the Project Area have already been converted into developed / disturbed habitat and thus loss of natural habitat is not a concern in this assessment. Currently, the area is generally not ecologically significant owing to the relatively low ecological value of the developed / disturbed area, which is the dominant habitat of the Project Site. Ecological impact to adjacent habitat due to air quality, noise and groundwater impact is minor owing to the minor scale of works involved. Although the fishponds within the Inner Deep Bay and WRA are important for wildlife, with the implementation of good site practices outlined in ProPECC Note PN1/94 to minimise site surface runoff from construction works areas and to control the dispersion of sediments and contaminants to inland waters, indirect disturbance to offsite wetland habitats is considered negligible.
No significant ecological impact will be resulted from the operation of the Project as all potential air quality, noise, water quality, waste and landscape impacts will be controlled to environmentally acceptable levels. Treated sewage effluent from the onsite STP would be fully reused onsite. With a comprehensive contingency program and careful implementation of the specifications stipulated by statutory standards, no offsite discharge of effluent would be anticipated during the normal operation, the disturbance impact to identified offsite aquatic habitats within the Study Area is thus considered to be negligible.
Two concurrent projects are identified but owing to the limited extent of the construction activities, no cumulative impact is identified. No specific ecological mitigation is considered necessary for the proposed Project.
A total of 8 LRs and 6 LCAs are identified within the landscape Study Area. Impacts to all identified LRs and LCAs are anticipated to be insubstantial even without mitigation during construction, operation and decommissioning phases. The residual landscape impact after the implementation of precautionary / enhancement measures will remain insubstantial.
Given that the existing site is bare land with no LRs and the scale of the Project is small and will be integrated into and compatible with the WSW Development, the landscape impact due to the Project is considered insubstantial for construction, operation and decommissioning phases.
No VSR is identified for the construction phase and a total of 4 planned VSRs are identified within the ZVI of the Project for the operation and decommissioning phases. Impacts to all identified planned VSRs are anticipated to be slight adverse after implementation of mitigation for both operation and decommissioning phases since the visual presence of the proposed STP cannot be completely eliminated by the recommended mitigation measures.
No construction phase visual impact is anticipated as no VSRs are identified during construction due to the enclosure of the site by noise barriers and screen hoardings. Planned VSRs during operation and decommissioning phases will experience a slight adverse visual impact due to unavoidable partial views of the above-ground structure of the proposed STP.
Overall, in terms of Annex 10, Clause 1.1 (c) of the EIAO TM, it is concluded that the landscape and visual impacts are acceptable with mitigation measures.
An overall summary of environmental impacts is shown in Table 9.1.
Table 9.1: Summary of Environmental Impacts
|
Assessment Points |
Results of Impact Prediction |
Relevant Standards / Criteria |
Extent of Exceedances Predicted |
Impact Avoidance Measures Considered |
Mitigation Measures Proposed |
Residual Impact for Mitigation |
|
Air Quality Impact |
||||||
|
Air Sensitive Receivers within 500m assessment area |
Construction Phase ● Insignificant fugitive dust emission and construction vehicle and machine emission are anticipated. ● Potential odour impact from excavation of sediment is considered to be short-term and controllable with proper control measures. Operation Phase ● Insignificant odour impact due to the proposed STP and sludge generated on the nearby ASRs is anticipated. Decommissioning Phase ● No adverse air quality impacts on the surrounding ASRs are anticipated.
|
● Annex 4 and 12 of Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM) ● Air Pollution Control Ordinance ● Air Pollution Control (Construction Dust) Regulation ● Air Pollution Control (Non-road Mobile Machinery) (Emission) Regulation
|
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
Construction Phase ● General practices for dust control. ● Relevant measures stipulated in Air Pollution Control (Construction Dust) Regulation. ● Complete covering using plastic tarpaulin sheets of all stockpiled malodour excavated material. Operation Phase For potential odour impact due to the proposed STP: ● The STP will be totally enclosed. ● Negative pressure ventilation will be provided within the enclosure to avoid any fugitive odorous emission from the STP. ● Further odour containment will be achieved by covering or confining the sewage channels, sewage tanks, and equipment with potential odour emission. ● Proper mixing will be provided at the equalization and sludge holding tanks to prevent sewage septicity. ● Chemical or biological deodorization facilities with 99.5% odour removal efficiency will be provided to treat potential odorous emissions from the STP including sewage channels / tanks, filter press and screening facilities so as to minimize any potential odour impact to the nearby ASRs. ● The deodorization facilities should be regularly maintained so as to ensure at least 99.5% odour removal efficiency. ● The deodorization facilities should be designed such that the discharge point is directed away from nearby ASRs. Decommissioning Phase N/A |
Construction Phase No adverse residual air quality impacts are anticipated. Operation Phase No adverse residual air quality impacts are anticipated. Decommissioning Phase N/A
|
|
Noise Impact |
||||||
|
The first layer of NSRs (nearest to the noise sources in various directions) has been selected as the assessment points within 300m assessment area. |
Construction Phase ● Under the prevailing site condition with existing vertical noise barriers, no significant noise impact is anticipated. Operation Phase With the adoption of the maximum allowable sound power levels for the proposed STP, no exceedances in relevant noise criteria is expected. Decommissioning Phase ● No adverse noise impact is anticipated.
|
● Environmental Impact Assessment Ordinance (Cap. 499); ● Noise Control Ordinance (Cap. 400); ● EIAO-TM: relevant Guidance Notes under EIAO; ● TM on Noise from Construction Work other than Percussive Piling (GW-TM); and ● TM on Places other than Domestic Premises, Public Places or Construction Sites (IND-TM).
|
Construction Phase N/A Operation Phase N/A |
Design Phase Appropriate noise reduction measures will be adopted (such as acoustic louver blade or ventilation silencers) at the noise source to ensure the required maximum allowable SWLs is achieved. Construction Phase N/A Operation Phase N/A |
Construction Phase ● Adoption of good site practice to limit noise emission at source; ● Adoption of QPME; ● Use of Noise Enclosure/Acoustic Shed; ● Use of Noise Insulating Fabric; and ● Schedule construction works carefully to avoid overlapping of works involving PME that emit loud noises. Operation Phase Noise commissioning test prior to the operation of the STP. Decommissioning Phase N/A |
Construction Phase No adverse residual noise impacts are anticipated. Operation Phase No adverse residual noise impacts are anticipated. Decommissioning Phase No adverse residual noise impacts are anticipated.
|
|
Water Quality Impact |
||||||
|
Water Sensitive Receivers within 500m assessment area |
Construction Phase With implementation of good site management practices and recommended mitigation measures, there will be: ● No adverse water quality impacts due to construction site runoff ● No adverse water quality impacts due to accidental spillage of chemicals ● No adverse water quality impacts due to sewage from construction workforce ● No adverse water quality impacts due to general construction activities Operation Phase ● No adverse water quality impacts due to use of reclaimed water onsite ● No discharge of reclaimed water to Deep Bay ● Risk of untreated sewage effluent discharge to Deep Bay due to emergency event is negligible Decommissioning Phase ● No adverse water quality impacts due to decommissioning of the onsite STP |
● Environmental Impact Assessment Ordinance (Cap. 499) ● Water Pollution Control Ordinance (Cap. 358) ● Technical Memorandum on Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters ● No Net Increase in Pollution Load Requirement in Deep Bay ● Practice Note for Professional Persons on Construction Site Drainage (ProPECC Note PN1/94) ● Guidelines for the Design of Small Sewage Treatment Plant. |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A
|
Construction Phase N/A Operation Phase Full onsite use of reclaimed water to avoid discharge to Deep Bay Decommissioning Phase The onsite STP would not be decommissioned until the sewerage connection to the Government sewer has been commissioned
|
Construction Phase ● Adoption of good site practices and precautionary measures for inclement weather as outlined in ProPECC Note PN1/94 ● Proper storage of chemicals ● Provision of portable toilets onsite ● Implementation of general good site management Operation Phase ● Use of Membrane Bioreactor technology with ultraviolet disinfection and chlorine dosing to treat the sewage generated by the WSW Development ● Implementation of preventive measures for cross-contamination and mis-use of reclaimed water ● Contingency measures including standby power supply, alarms and storage tank to prevent discharge of treated or untreated sewage effluent to Deep Bay Decommissioning Phase ● Any wastewaters generated from the decommissioning process and any residual untreated sewage or reclaimed water would be pumped out and tanked away to the public sewage treatment work for offsite treatment and disposal.
|
Construction Phase No adverse residual water quality impacts are anticipated. Operation Phase No adverse residual water quality impacts are anticipated. Decommissioning Phase No adverse residual water quality impacts are anticipated.
|
|
Waste Management Implication |
||||||
|
Study Area |
Construction Phase ● Inert construction and demolition (C&D) materials of about 14,000m3 will be generated from excavation; foundation; sewage treatment plant (STP) construction works; ● Very minor amount of non-inert C&D materials generated from excavation; foundation; STP construction works; ● Sediment of 800m3 will be generated from excavation works; ● General refuse of maximum daily arising of up to 20kg from construction workforce; ● Small quantity of chemical waste from maintenance and servicing of construction plant and equipment.
Operation Phase ● The total quantity of screening and grits generated in the proposed STP is expected to be 0.075 m3/day; ● About 13m3/day of sewage sludge will be generated from sewage treatment plant; ● About 3.5 kg/day of general refuse will be generated from operation activities; ● Chemical waste refuse will be generated from maintenance activities.
Decommissioning Phase ● No adverse waste impact is anticipated. |
● Annexes 7 and 15 of EIAO-TM ● Waste Disposal Ordinance (Cap. 354); ● Waste Disposal (Chemical Waste) (General) Regulation (Cap. 354C); ● Waste Disposal (Charges for Disposal of Construction Waste) Regulation (Cap. 354N); ● Dumping at Sea Ordinance (Cap. 466); ● Public Cleansing and Prevention of Nuisances Regulation (Cap. 132BK); and ● Land (Miscellaneous Provisions) Ordinance (Cap. 28). |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A
|
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A
|
Construction Phase ● Good site practices and waste reduction measures for C&D materials ● The inert C&D materials should be reused on-site as fill material as far as practicable ● The loading, unloading, handling, transfer or storage of treated and untreated sediment should be carried out in such a manner to prevent or minimise dust emissions ● Handling of chemical wastes in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes, and disposal of chemical wastes at licensed chemical waste recycling/ treatment facilities ● Employ a reputable licensed waste collector for disposal of general refuse at designated landfill sites
Operation Phase ● Screening and grits generated will be transferred to closed containers before transportation and disposal at designated landfill sites ● The collected sludge will be transported to the designated landfill site or public sewage treatment works by designated sewage tankers for disposal ● Employ a reputable licensed waste collector to collect general refuse on a daily basis and dispose of the general refuse at designated landfill sites ● Handling of chemical wastes in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes, and disposal of chemical wastes at licensed chemical waste recycling/ treatment facilities
Decommissioning Phase N/A |
Construction Phase No residual impacts would be anticipated.
Operation Phase No residual impacts would be anticipated.
Decommissioning Phase N/A
|
|
Ecological Impact |
||||||
|
Ecological sensitive receivers, habitats and species potentially affected by the proposed works within 500m assessment area |
Construction & Decommissioning Phase ● No direct impact on species and habitats loss is anticipated. ● Minor indirect impact to wetland restoration area, offsite habitats. ● Minor ecological impacts on the faunal species of conservation interest recorded within the Wetland Restoration Area and other offsite habitats are anticipated. Operation Phase ● Indirect ecological impact due to noise and odour emission is anticipated to be negligible. ● Indirect impact on treatment of sewage effluent to aquatic habitat is anticipated to be negligible. |
● Forests and Countryside Ordinance (Cap. 96) ● Forestry Regulations (Cap. 96 sub. leg.) ● Wild Animals Protection Ordinance (Cap. 170) ● Protection of Endangered Species of Animals and Plants Ordinance (Cap. 586) ● EIAO-GN No. 6/2010, 7/2010 and 10/2010 ● Annexes 8 and 16 of the EIAO-TM ● Town Planning Ordinance (Cap. 131) ● Town Planning Board Guideline no. 12C ● Hong Kong Planning Standards and Guidelines Chapter 10 |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
● Given that the mitigation measures for air, noise, water, waste and landscape aspects proposed in respective sections which are indirectly beneficial to the local ecology shall be checked as part of the environmental monitoring and audit procedures during construction period as presented in the standalone EM&A Manual, no specific ecological monitoring and audit programme is considered required. |
Construction, Operation and Decommissioning Phase Residual loss of habitat with low ecological value in the Project Area would be anticipated.
Minor / negligible impacts on nearby wetland habitats and associated fauna would be anticipated. |
|
Landscape and Visual Impacts |
||||||
|
Landscape Resources (LRs) and Landscape Character Areas (LCAs) within 100 m Study Area and Visually Sensitive Receivers (VSRs) within the Zone of Visual Influence (ZVI) |
Construction Phase Landscape impact is anticipated to be insubstantial and no VSRs have been identified. Operation Phase Landscape impact is anticipated to be insubstantial and visual impact is anticipated to be slight adverse to a small number of VSRs. Decommissioning Phase Landscape impact is anticipated to be insubstantial and visual impact is anticipated to be slight adverse to a small number of VSRs. |
● Annexes 10, 11, 18, 20 and 21 EIAO-TM ● EIAO GN No. 8/2010 |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
Construction Phase N/A Operation Phase N/A Decommissioning Phase N/A |
Construction Phase ● Integration of Construction Programme with that of the WSW Development ● Advance Planting ● Dust and Erosion Control for Exposed Soil Operation Phase ● Sensitive Design and Disposition ● Visual Screening ● Screen Planting ● Enhancement Planting ● Green Roofs and Vertical Greening Decommissioning Phase Same as operation phase |
Construction Phase Landscape impact remains insubstantial and no visual impact. Operation Phase Landscape impact remains insubstantial and visual impact remains slight adverse. Decommissioning Phase Landscape impact remains insubstantial and visual impact remains slight adverse. |
A summary of key assessment assumptions, limitation of assessment methodologies and related prior agreements with relevant Government Departments is presented in Table 9.2.
Table 9.2: Key Assessment Assumptions, Limitations of Assessment Methodologies and Prior Agreements
|
Assessment Methodology |
Key Assessment Assumptions |
Limitations of Assessment Methodologies / Assumptions |
Prior Agreements with the Director or other Authorities |
Proposed Alternative Assessment Tools / Assumptions (if applicable) |
Justification / Supporting Documents for Alternative Assessment Tools / Assumptions (if applicable) |
|
Air Quality Construction Phase |
|||||
|
Fugitive dust impacts are anticipated to be short-term and could be controlled with the mitigation measures presented in Section 3.6.1. As reviewed in Section 3.3.2, the environmental monitoring and audit (EM&A) data recorded for the WSW Development at the Project site shows no exceedances of the hourly TSP criterion. Therefore, a qualitative assessment of the dust impact is carried out.
|
N/A |
N/A |
N/A |
N/A |
N/A |
|
Air Quality Operation Phase |
|||||
|
During operation phase, it is anticipated that the ASRs would be subject to potential odour impacts proposed and existing odour emission sources within the 500m Study Area. As the proposed STP will be fully enclosed and is not of a large scale, the potential odour impact is assessed in a qualitative manner. |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Air Quality Decommissioning Phase |
|||||
|
The proposed STP will be decommissioned, but the structures will be retained in-situ and will not be demolished. Hence no adverse air quality impacts on the surrounding ASRs are anticipated.
|
N/A |
N/A |
N/A |
N/A |
N/A |
|
Noise Impact Construction Phase |
|||||
|
Assessment in accordance with Appendix C of EIA Study Brief No. ESB-289/2015 and Annex 5 and 13 of the EIAO-TM |
Construction works carried out in the present of existing continuous vertical noise barriers. All lines of sight from existing NSRs blocked by vertical noise barriers. |
N/A |
N/A |
N/A |
See noise barriers photos in Figure 4.4 |
|
No ground-borne noise sources are identified, hence no ground-borne noise impact assessment is carried out. |
No drill and blast method carried out for underground work. |
N/A |
N/A |
N/A |
N/A |
|
Noise Impact Operation Phase |
|||||
|
In the absence of detailed information and noise specification for the proposed interim STP, the maximum allowable noise emission level at the opening is determined for future detail design. |
The maximum allowable sound power levels are determined by adopting standard acoustics principles. |
N/A |
N/A |
N/A |
N/A |
|
Noise Impact Decommissioning Phase |
|||||
|
The structure of the STP and its associated infrastructure will only cease operation and will not be demolished. No noise impact is anticipated during decommissioning phase. |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Water Quality Impact Construction Phase |
|||||
|
Assessment in accordance with Appendix D of EIA Study Brief No. ESB-289/2015 and Annex 6 and 14 of the EIAO-TM |
N/A |
Qualitative assessment only |
N/A |
N/A |
N/A |
|
Water Quality Impact Operation Phase |
|||||
|
Assessment in accordance with Appendix D of EIA Study Brief No. ESB-289/2015 and Annex 6 and 14 of the EIAO-TM |
Design population of 1,245 persons
|
The accumulative average dry weather flows are estimated based on the Guidelines for Estimating Sewage Flows for Sewage Infrastructure Planning published by EPD |
N/A |
N/A |
N/A |
|
Water Quality Impact Decommissioning Phase |
|||||
|
Assessment in accordance with Appendix D of EIA Study Brief No. ESB-289/2015 and Annex 6 and 14 of the EIAO-TM |
N/A |
Qualitative assessment only |
N/A |
N/A |
N/A |
|
Waste Management Implications Construction Phase |
|||||
|
Assessment in accordance with Appendix E of EIA Study Brief No. ESB-289/2015 and Annex 7 and 15 of the EIAO-TM |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Waste Management Implications Operation Phase |
|||||
|
Assessment in accordance with Appendix E of EIA Study Brief No. ESB-289/2015 and Annex 7 and 15 of the EIAO-TM |
Design population of 1,245 persons
|
The estimation of sewage sludge to be generated will be varied if the design population of 1,245 persons is revised |
N/A |
N/A |
N/A |
|
Waste Management Implications Decommissioning Phase |
|||||
|
Assessment in accordance with Appendix E of EIA Study Brief No. ESB-289/2015 and Annex 7 and 15 of the EIAO-TM |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Ecological Impact (Terrestrial and Aquatic) Construction Phase |
|||||
|
Assessment in accordance with Appendix F of EIA Study Brief No. ESB-289/2015 and Annexes 8 and 16 of the EIAO-TM |
Since the construction is only limited to WSW residential development site, anticipated impact would not exceed that anticipated in the WSW EIA |
Assessment is based on literature review on data reported in EIA and concurrent EM&A reports only |
N/A |
N/A |
N/A |
|
Ecological Impact (Terrestrial and Aquatic) Operation Phase |
|||||
|
Assessment in accordance with Appendix F of EIA Study Brief No. ESB-289/2015 and Annexes 8 and 16 of the EIAO-TM |
Since the operation of the proposed Project is only limited to WSW residential development site, anticipated impact would not exceed that anticipated in the WSW EIA |
Assessment is based on literature review on data reported in EIA and concurrent EM&A reports only |
N/A |
N/A |
N/A |
|
Ecological Impact (Terrestrial and Aquatic) Decommissioning Phase |
|||||
|
Assessment in accordance with Appendix F of EIA Study Brief No. ESB-289/2015 and Annexes 8 and 16 of the EIAO-TM |
N/A |
Assessment is based on literature review on data reported in EIA and concurrent EM&A reports only |
N/A |
N/A |
N/A |
|
Landscape and Visual Impact Construction Phase |
|||||
|
Assessment in accordance with EIAO GN No. 8/2010 and Appendix G of EIA Study Brief No. ESB-289/2015 |
This Project will be integrated into and compatible with the WSW Development, and noise barriers / screen hoardings will be maintained throughout the construction phase |
N/A |
N/A |
N/A |
N/A |
|
Landscape and Visual Impact Operation Phase |
|
|
|
|
|
|
Assessment in accordance with EIAO GN No. 8/2010 and Appendix G of EIA Study Brief No. ESB-289/2015 |
Planned VSRs are identified from the latest available development layout and building plans of the WSW Development |
The assumptions on the locations and views of the identified planned VSRs will be invalid should the development layout / building plans of the WSW Development be revised |
N/A |
N/A |
N/A |
|
Landscape and Visual Impact Decommissioning Phase |
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|
|
|
|
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Assessment in accordance with EIAO GN No. 8/2010 and Appendix G of EIA Study Brief No. ESB-289/2015 |
Planned VSRs are identified from the latest available development layout and building plans of the WSW Development |
The assumptions on the locations and views of the identified planned VSRs will be invalid should the development layout / building plans of the WSW Development be revised |
N/A |
N/A |
N/A |