Central Police Station Compound Conservation and Revitalisation

Table 10.1 Impact Summary

Assessment Aspect	Construction Phase	Operation Phase
Cultural Heritage
Assessment Points / Sensitive Receivers	· The CPS (including three Declared Monuments: the Central Police Station, the Central Magistracy and the Victoria Prison) · Potential archaeological remains within the CPS · Built heritage resources within 50m of the Project Site (including the Grade 1 historic street (Pottinger Street), Proposed Grade 3 historic building (No. 20 Hollywood Road), Hollywood Road, Old Bailey Street, Chancery Lane and Steps, Arbuthnot Road and Walls at Old Bailey Street)	· The CPS (including three Declared Monuments: the Central Police Station, the Central Magistracy and the Victoria Prison) · Potential archaeological remains within the CPS
Relevant Criteria	· Environmental Impact Assessment Ordinance (EIAO) (Cap. 499. S16), Technical Memorandum on the EIA Process, Annex 10 and 19 (EIAO TM) and Guidance Notes on Assessment of Impact on Sites of Cultural Heritage in EIA Studies; · Antiquities and Monuments (AM) Ordinance (Cap. 53); · Guidelines for Cultural Heritage Impact Assessment (CHIA) for Adaptive Reuse Projects (as at May 2009); · Hong Kong Planning Standards and Guidelines (HKPSG); and · Land (Miscellaneous Provisions) Ordinance.	· Environmental Impact Assessment Ordinance (EIAO) (Cap. 499. S16), Technical Memorandum on the EIA Process, Annex 10 and 19 (EIAO TM) and Guidance Notes on Assessment of Impact on Sites of Cultural Heritage in EIA Studies; · Antiquities and Monuments (AM) Ordinance (Cap. 53); · Guidelines for Cultural Heritage Impact Assessment (CHIA) for Adaptive Reuse Projects (as at May 2009); · Hong Kong Planning Standards and Guidelines (HKPSG); and · Land (Miscellaneous Provisions) Ordinance.
Results of Impact	Built Heritage within the CPS · The range of Impact Category Ratings for the interventions in the following buildings are 1 (Beneficial), 2 (Acceptable), and 3 (Acceptable with Mitigation Measures). The overall Heritage Impact of the proposed interventions to these buildings is therefore regarded as acceptable to enable the building to have a new adaptive use: o Police Headquarters o Armoury o Barrack Block o Married Inspectors’ Quarters and Deputy Superintendents House o Married Sergeant’s Quarters o Single Inspectors’ Quarters o Ablutions Block o Central Magistracy o Superintendent’s House o A Hall o B Hall o C Hall o D Hall o E Hall o F Hall o Bauhinia House o Parade Ground o Laundry (structure with little architectural interest and has been altered over time with substantial repairs to be demolished) o Walls and Revetments · An impact rating of the interventions in the following buildings/features is 2 – Acceptable Impact: o Garage (structure with no architectural or historical significance to be demolished to make way for open space) o General Office (structure with no architectural or historical significance to be demolished) o Prison Yard	It is anticipated that with the implementation of the Conservation Management Plan, the Heritage Operational Strategy & Manual and the Interpretation Strategies/Plans, the impact rating for the CPS as a whole will be 1 – Beneficial.
	Potential Archaeological Resources within the CPS · It is anticipated that the areas identified to have archaeological potential are considered to be low or fairly low. Therefore, the impact on the low archaeological potential resources areas is likely to be acceptable with mitigation measures being taken. Impact ratings for specific areas are as follows: o Parade Ground: 3 – Acceptable Impact with Mitigation Measures o Prison Yard: 3 – Acceptable Impact with Mitigation Measures o Barracks Lane (cell blocks south of building 3): 3 – Acceptable Impact with Mitigation Measures o The Garage: No impact o Married Inspectors’ Quarters and Deputy Superintendent’s House: No Impact o The area between A Hall and B Hall: 3 – Acceptable Impact with Mitigation Measures o The area between and beneath Ablutions block and the revetment wall to the south: 3 – Acceptable Impact with Mitigation Measures o West end of D Hall: 3 – Acceptable Impact with Mitigation Measures o Laundry: 3 – Acceptable Impact with Mitigation Measures o General Office: 3 – Acceptable Impact with Mitigation Measures Built Heritage Resources Outside the CPS · Generally the works within the Site will have little or no impact on built heritage resources outside the CPS. This is in large part because the changes to occur within the CPS are contained within the constraints of the compound itself. Impact ratings for specific areas are as follows: o Grade 1 historic building (Pottinger Street: 1 – Beneficial Impact) o Proposed Grade 3 historic building (No. 20 Hollywood Road): 2 – Acceptable Impact with mitigation measures o Hollywood Road: 2 – Acceptable Impact o Old Bailey Street: 2 – Acceptable Impact o Chancery Lane: 1 – Beneficial Impact o Arbuthnot Road: 1 – Beneficial Impact o Walls and Tunnel of Old Bailey Street: 2 – Acceptable Impact o Chancery Lane Steps: 1 – Beneficial Impact
Extents of Exceedance	Not expected	Not expected
Avoidance / Mitigation Measures	Prior to construction commencement during the detailed design stage of the Project, the following works will be conducted to ensure adequate information are obtained to finalise the design and conservation work required: · Comprehensive survey and impact assessment of Character Defining Elements (CDE); · Archival recording; · Addition and alteration (A&A) works proposal submissions; · Detailed structural assessment; and · Archaeological investigation. The modification/refurbishment works at the existing buildings are kept to a minimum by carefully assigning appropriate uses to fit in the spaces and adopting a fire engineering approach to minimise alteration while complying with fire safety requirements. The general mitigation measures to be used during the construction phase will include: · Prior identification and recording of the all the significant features, finishes, fittings and contents in the existing buildings, and assessment of their vulnerability during construction. This should include for instance the recording of historic doors which are vulnerable to damage if left in situ or carelessly removed and stored. · Permanent or temporary removal off site of loose or vulnerable items. · Preparation of a schedule of protection works to preserve or secure items and finishes remaining in situ during construction. · Non-percussive piling methods will be adopted for the construction of the foundation for the new buildings and a lateral support system will be used to minimise the potential vibration impact to adjacent historic buildings during construction. · Protection measures to the exteriors and interiors of the buildings during construction operations. · Ensuring the responsible contractor understands the significance and vulnerabilities of the building structures, constructions, features and finishes prior to starting the work to avoid overloading or inappropriate storage or construction activities. · Use of appropriate heritage related construction methods for the modification and refurbishment works As there is no development proposal that involves soil excavation on one of the nine areas (Garage), other than possibly for new underground services which will be designed during the detailed drawing stage no impact on this archaeological potential area is anticipated. Subject to the findings of the archaeological investigation, appropriate mitigation measures will be recommended and agreed with the AMO. Prior to commencement of the construction works, a baseline condition survey and baseline vibration impact has been recommended to be conducted by a specialist covering the existing historic buildings in the CPS Site and the Proposed Grade 3 Historic building (No. 20 Hollywood Road) outside CPS to define the vibration control limits and recommend a vibration monitoring proposal for the concerned historic buildings in CPS. As the concerned historic buildings in the CPS Site are declared monuments, the proposal should be submitted to the Antiquities Authority under the AM Ordinance for granting a permit for the work. If the evaluated and/or measured vibrations have been found to exceed the allowable values or if damage to either structural or non-structural elements of the historic buildings has been identified, the construction work should be stopped and the construction method and appropriate mitigation measures should be the reviewed and submitted to the Antiquities Authority for approval.	To implement the Conservation Management Plan (June 2008), the Heritage Operational Strategy and Manual and the Interpretation Strategies/Plans. Regular audit for checking the compliance and effectiveness of the mitigation measures recommended in Sections 3.7.4 and 3.7.5 of the EIA report. The detailed proposal of the regular audit such as methodology (e.g. performance and monitoring indicators, control tools, frequency of the audit, etc) and the conservation professionals to be engaged should be agreed with AMO prior to operation commencement.
Residual Impact	Slight to moderate residual impact is expected due to the alteration to the overall visual appearance of the Site. However, the majority of the potential impact is beneficial to the CPS and its users. With the implementation of the CMP and the mitigation measures recommended in Section 3.7 the residual impact is considered acceptable.	Not expected
Environmental Acceptability	Impacts to cultural heritage resources are acceptable with mitigation measures.	Impacts to cultural heritage resources are acceptable with mitigation measures.
Landscape & Visual
Assessment Points / Sensitive Receivers	Landscape Resources (LRs): LR1 – Transport Route LR2 - Commercial / Residential /Institutional Building Area LR3 – Buildings within Declared Monument LR4 – Open Space within Declared Monument LR5 – Public Park/ Recreational Area LR6 – Hong Kong Zoological & Botanical Garden LR7 – Vegetated Slope LR8 – Natural Woodland on Hillside LR9 – Temple Area Landscape and Visual Character Areas (LCAs): LCA1 – Historical Landscape LCA2 – LCSD Theme Park Landscape LCA3 – Medium/High-rise Commercial Urban Landscape LCA4 – Residential/ Commercial Urban Landscape LCA5 – Central Civic Administration Landscape LCA6 – Natural Hillside Landscape LCA7 – Major Transport Corridor Visually Sensitive Receivers (VSRs) and Vantage Points (VPs) VSR T2 – Central/ Mid-Levels Escalator above Hollywood Road (VPa) VSR H/O1 – Medium/ High Level Commercial/Residential Building(s) above Hollywood Road (VPb) VSR T3 – Street Level at The Centrium on Arbuthnot Road (VPc) VSR H2 – Medium/High Rise Level Residential Building(s) on Chancery Lane (VPd) VSR T4 – Street Level at Old Bailey Street/ Chancery Lane Junction (VPe) VSR T5 – Street Level at Hollywod Road/ Pottinger Street Junction (VPf) VSR T1 Street Level at Staunton Street/ Peel Street Junction VSR O1 Medium/High Level Commercial Building(s) (IFC Building) VSR O2 Medium/High Level CommercialBuilding(s) (QRC Building) VSR H1 Medium/High Level Residential Buildings in Mid-levels (Grand Panorama Building) VSR R1 Open/Park Area off Old Bailey Street VSR H3 Medium/High Level Residential Buildings on Old Bailey Street The tree survey undertaken indentified eleven trees within the Site, using the government's definition of a tree as a woody plant with a trunk diameter of at least 95 mm at 1.3 m height. None of the trees can be gauged as being in ‘excellent’ health and only two trees, namely the large T5 (Mangifera indica) in the Parade Ground, and the relatively small wall tree T10 (Ficus microcarpa) between the Police and Prison sites, have performed sufficiently well to deserve the good rating.	Landscape Resources (LRs): LR1 – Transport Route LR2 - Commercial / Residential /Institutional Building Area LR3 – Buildings within Declared Monument LR4 – Open Space within Declared Monument LR5 – Public Park/ Recreational Area LR6 – Hong Kong Zoological & Botanical Garden LR7 – Vegetated Slope LR8 – Natural Woodland on Hillside LR9 – Temple Area Landscape and Visual Character Areas (LCAs): LCA1 – Historical Landscape LCA2 – LCSD Theme Park Landscape LCA3 – Medium/High-rise Commercial Urban Landscape LCA4 – Residential/ Commercial Urban Landscape LCA5 – Central Civic Administration Landscape LCA6 – Natural Hillside Landscape LCA7 – Major Transport Corridor Visually Sensitive Receivers (VSRs) and Vantage Points (VPs) VSR T2 – Central/ Mid-Levels Escalator above Hollywood Road (VPa) VSR H/O1 – Medium/ High Level Commercial/Residential Building(s) above Hollywood Road (VPb) VSR T3 – Street Level at The Centrium on Arbuthnot Road (VPc) VSR H2 – Medium/High Rise Level Residential Building(s) on Chancery Lane (VPd) VSR T4 – Street Level at Old Bailey Street/ Chancery Lane Junction (VPe) VSR T5 – Street Level at Hollywod Road/ Pottinger Street Junction (VPf) VSR T1 Street Level at Staunton Street/ Peel Street Junction VSR O1 Medium/High Level Commercial Building(s) (IFC Building) VSR O2 Medium/High Level CommercialBuilding(s) (QRC Building) VSR H1 Medium/High Level Residential Buildings in Mid-levels (Grand Panorama Building) VSR R1 Open/Park Area off Old Bailey Street VSR H3 Medium/High Level Residential Buildings on Old Bailey Street Trees within the Site.
Relevant Criteria	· Environmental Impact Assessment Ordinance (Cap.499, S.16) and the Technical Memorandum on EIA Process (EIAO TM), particularly: o Annex 10 (Criteria for Evaluating Visual and Landscape Impact, and Impact on Sites of Cultural Heritage) o Annex 18 (Guidelines for Landscape and Visual Impact Assessment) · EIAO Guidance Note No. 8/2002 (Preparation of Landscape and Visual Impact Assessment under the Environmental Impact Assessment Ordinance); · ETWB TCW No. 3/2006 - Tree Preservation; · ETWB TCW No. 29/2004 - Registration of Old and Valuable Trees, and Guidelines for their Preservation · ETWB-TC(W) No. 10/2005 - Planting on Footbridges and Flyovers · Land Administration Office (LAO), Lands Department Practice Note No. 7/2007 - Tree Preservation and Tree Removal Application for Building Development in Private Projects · WBTC No. 7/2002 - Tree Planting in Public Works; · Hong Kong Planning Standards and Guidelines Chapter 4 (Recreation, Open Space and Greening) and Chapter 11 ( Urban Design Guidelines); and · Study on Landscape Value Mapping of Hong Kong	· Environmental Impact Assessment Ordinance (Cap.499, S.16) and the Technical Memorandum on EIA Process (EIAO TM), particularly: o Annex 10 (Criteria for Evaluating Visual and Landscape Impact, and Impact on Sites of Cultural Heritage) o Annex 18 (Guidelines for Landscape and Visual Impact Assessment) · EIAO Guidance Note No. 8/2002 (Preparation of Landscape and Visual Impact Assessment under the Environmental Impact Assessment Ordinance); · ETWB TCW No. 3/2006 - Tree Preservation; · ETWB TCW No. 29/2004 - Registration of Old and Valuable Trees, and Guidelines for their Preservation · ETWB-TC(W) No. 10/2005 - Planting on Footbridges and Flyovers · Land Administration Office (LAO), Lands Department Practice Note No. 7/2007 - Tree Preservation and Tree Removal Application for Building Development in Private Projects · WBTC No. 7/2002 - Tree Planting in Public Works; · Hong Kong Planning Standards and Guidelines Chapter 4 (Recreation, Open Space and Greening) and Chapter 11 ( Urban Design Guidelines); and · Study on Landscape Value Mapping of Hong Kong
Results of Impact / Extent of Exceedance	During the construction stage, potential landscape and visual impacts may arise from: · works for demolition of surrounding stone brick wall and construction of entrance to service yard; · works for demolition of works for demolition of existing building structures – the Garage, Workshop & Laundry and General Office; · works for cleaning, re-painting, dismantling and reinstatement of sections of surrounding stone brick wall; · conservation, repair and refurbishment work on the external façade of the retained buildings including erection of scaffolding; · excavation work including that for construction of basement in lower courtyard; · new custom paving works throughout the Site; · construction of new built structures (Old Bailey Wing, Arbuthnot Wing, new footbridge); · construction of new pavement west of Arbuthnot Road and extension of existing pavement on Old Bailey Street around pier for new footbridge; · temporary stockpiling of construction and demolition materials and temporary storage of construction equipment; · temporary use of construction equipment on-site including cranes and vehicles; · off-site construction traffic such as haulage of excavated materials; · temporary traffic/ road diversions; · night-time lighting; and · dust during dry weather. Significant Impact on the following LRs/LCA at construction phase without mitigation: · LR3 – Buildings within Declared Monument · LR4 – Open Space within Declared Monument · LCA1 – Historical Landscape Slight Impact on the following LRs/LCA at construction phase without mitigation: · LR1 – Transport Route · LCA4 – Residential/Commercial Urban Landscape Impacts on all other LRs/LCAs at construction phase without mitigation are insignificant. Amongst the eleven trees found on site, four dead/damaged trees (T1, T2, T3 and T4) and one healthy tree (T10) will be removed. The rest of the trees will be retained. The size, tree form, performance, and landscape and amenity value of T10, in comparison with the large and robust wall trees in other parts of the city, are relatively low. Due to site and technical constraints, in situ preservation and transplanting cannot be recommended. Significant Impact on the following VSRs at construction phase without mitigation: · T2 – Central/ Mid-Levels Escalator above Hollywood Road · H/O1 – Medium/High Level Commercial/Residential Building(s) above Hollywood Road · T3 – Street Level at The Centrium on Arbuthnot Road · H2 – Medium/High Rise Level Residential Building(s) on Chancery Lane · T5 - Street Level at Hollywood Road/Pottinger Street Junction · H3 – Medium/High Level Residential Buildings on Old Bailey Street Moderate Impact on the following VSRs at construction phase without mitigation: · T4 – Street Level at Old Bailey Street/ Chancery Lane Junction · H1 – Medium/High Level Residential Buildings in Mid-levels (Grand Panorama Building) Slight Impact on the following VSRs at construction phase without mitigation: · T1 – Street Level at Staunton Street/ Peel Street Junction · O1 – Medium/High Level Commercial Building(s) (IFC Building) · O2 – Medium/High Level Commercial/Residential Building(s) (QRC Building) · R1 – Open/Park Area off Old Bailey Street	During the operation stage, potential landscape and visual impacts would be related to the following: · landscaping works (eg new planting site, new green wall, existing tree treatment); · repaired and refurbished external façades of retained buildings; · operation of new built structures (Old Bailey Wing, Arbuthnot Wing, new footbridge, new access points); · new pavement – west of Arbuthnot Road and extension of existing on Old Bailey Street around pier for new footbridge; · cleaned, re-painted, refurbished and repaired sections of external stone wall and building façades; and · night time lighting. The impacts of the Project’s operation phase before mitigation on any LR/LCA are not considered significant. Moderate impact on the following LRs/LCA at operation phase without mitigation · LR3 – Buildings within Declared Monument · LCA1 – Historical Landscape Insignificant impact on the following LRs/LCA at operation phase without mitigation · LR1 – Transport Route · LR4 – Open Space within Declared Monument · LCA4 – Residential/Commercial Urban Landscape Significant Impact on the following VSRs at operation phase without mitigation: · T3 – Street Level at The Centrium on Arbuthnot Road · H2 – Medium/High Rise Level Residential Building(s) on Chancery Lane · H3 – Medium/High Level Residential Buildings on Old Bailey Street Moderate Impact on the following VSRs at operation phase without mitigation: · T2 – Central/Mid-Levels Escalator above Hollywood Road · H/O1 – Medium/High Level Commercial/Residential Building(s) above Hollywood Road · T4 – Street Level at Old Bailey Street/ Chancery Lane Junction · H1 – Medium/High Level Residential Buildings in Mid-levels (Grand Panorama Building) Slight Impact on the following VSRs at operation phase without mitigation: · T5 – Street Level at Hollywood Road/Pottinger Street Junction · T1 – Street Level at Staunton Street/ Peel Street Junction · O1 – Medium/High Level Commercial Building(s) (IFC Building) · O2 – Medium/High Level Commercial Building(s) (QRC Building) · R1 – Open/Park Area off Old Bailey Street Glare Impact The design intention for the new buildings is to use non-reflective material for the façade which will help to minimise potential glare interference. At night, light emitted from the building will be partially screened by the façade units, creating a balance between being able to express the life of the buildings within while also being able to reduce light pollution. The most open area within the new buildings at night is the public restaurant which is located on the north end of Old Bailey Wing and away from the row of residential buildings directly to the south. All lights within the CPS will be turned to night time mode (dimmed) after 11pm. Currently no façade lighting is proposed for the existing buildings. Given the choice of façade treatment and Site lighting considerations, the glare impact from the Project is considered to be acceptable.
Avoidance / Mitigation Measures	M1 Detailed Design Consideration CM1 In-situ Tree Protection - Cordon Zone (CZ) CM2 In-situ Tree Protection - Advanced & Phased Root Pruning CM3 In-situ Tree Protection - Foliage cleansing system CM4 In-situ Tree Protection - Monthly inspection CM5 Light Control CM6 Compensatory Tree Planting CM7 Vertical Greening CM8 New Custom Paving	OM1 In-situ Tree Protection - Quarterly inspection OM2 Soft Landscape Maintenance OM3 Architectural Maintenance OM4 Light Control
Residual Impact	Moderate Impact on the following LRs/LCA at construction phase with mitigation: · LR3 - Buildings within Declared Monument · LR4 – Open Space within Declared Monument · LCA1 – Historical Landscape Slight Impact on the following LRs/LCA at construction phase with mitigation: · LR1 – Transport Route · LCA4 – Residential/Commercial Urban Landscape Impacts on all other LRs/LCAs at construction phase with mitigation are insignificant. Mitigation measures to protect the retained trees and compensation of the removal of T10 will be implemented. With the implementation of the mitigation measures, impacts on the trees are considered acceptable. Construction is assumed to be carried out following standard good practise, and the construction impact will not be significantly reduced by additional mitigation measures such that upon mitigation, all the visual impacts are considered to remain the same as prior to mitigation. However, it is worth noting that the impact will be transient and will be reduced gradually following operation.	The residual impacts on all LCAs at day 1 of operation with mitigation are insignificant, with the exception of a slight residual impact on LR3 – Buildings within Declared Monument LCA1 – Historical Landscape. All ratings for the residual impacts at year 10 of operation with mitigation remain the same, with the exception of LR4 – Open Space within Declared Monument which is enhanced from insignificant to slightly beneficial. Upon implementation of mitigation measures, at operation day 1 the visual impacts on: • T3 (Street Level at the Centrium on Arbuthnot Road), H2 (Medium/High rise Level residential Building(s) on Chancery Lane) and H3 (Medium/High Level Residential Buildings on Old Bailey Street) will reduce to moderate while that for T2 (Central/Mid-levels Escalator above Hollywood Road) will remain moderate. • H/O1 (Medium/High Level Commercial/Residential Building(s) above Hollywood Road), T4 (Street Level at Old Bailey Street/ Chancery Lane Junction) and H1 (Medium/High Level Residential Buildings in Mid-levels [Grand Panorama Building]) will reduce to slight while impacts on T5 (Street Level at Hollywood Road/Pottinger Street Junction), T1 (Street Level at Staunton Street/ Peel Street Junction) and O2 (Medium/High Level Commercial Building(s) [QRC Building]) will remain slight. • O1 (Medium/High Level Commercial Building(s) [IFC Building)) and R1 (Open/Park Area off Old Bailey Street) will reduce to insignificant. At operation year 10 with mitigation, the residual impacts remain the same for all the VSRs.
Environmental Acceptability	Impacts on landscape resources and sensitive receivers are acceptable with mitigation measures.	Impacts on landscape resources and sensitive receivers are acceptable with mitigation measures.
Air Quality
Assessment Points / Sensitive Receivers	A1 – Au’s Building A2 – Chinachem Hollywood Centre A3 – Carfield Commercial Building A4 – Vimark House A5 – Yu Yuet Lai Building A6 – The Centrium A7 – Chancery Mansions A8 – Chancery House A9 – Cambridge Villa A10 – Sunrise House A11 – Old Bailey Street Junior Police Office Married Quarter A12 – Ho Fook Building A13 - Winning House	A1 – Au’s Building A2 – Chinachem Hollywood Centre A3 – Carfield Commercial Building A4 – Vimark House A5 – Yu Yuet Lai Building A6 – The Centrium A7 – Chancery Mansions A8 – Chancery House A9 – Cambridge Villa A10 – Sunrise House A11 – Old Bailey Street Junior Police Office Married Quarter A12 – Ho Fook Building A13 - Winning House
Relevant Criteria	Hong Kong Air Quality Objectives: TSP : Daily average of 260 mg m^-3; annual average of 80 mg m^-3 EIAO-TM: TSP : Hourly average of 500 mg m^-3	Hong Kong Air Quality Objectives: NO₂ : Hourly average of 300 mg m^-3; daily average of 150 mg m^-3; annual average of 80 mg m^-3 SO₂ : Hourly average of 800 mg m^-3; daily average of 350 mg m^-3; annual average of 80 mg m^-3 RSP : Daily average of 180 mg m^-3; annual average of 55 mg m^-3
Results of Impact	The construction of the Project involves small-scale site formation/foundation works, new building construction, refurbishment works for the existing buildings, and minor-scale demolition of existing structures. Excavation, truck movements, materials handling and wind erosion of open stockpiles of dusty materials were identified as the major dust generating activities. In view of the small size of the worksite and small quantity of excavated materials to be generated, limited excavated soil will be stockpiled on-site. No adverse fugitive dust impact is envisaged with the implementation of dust control measures and adoption of good construction site practices. Minor air quality impacts associated with gaseous emissions of diesel-powered construction plant and equipment are anticipated as only a small number of construction vehicles and plant will be operated in the limited works areas at any one time.	Gaseous emissions from kitchens are identified as potential sources of air pollutants. Electric stoves will be installed in the kitchens within the Project, and therefore no gaseous or liquid fuels will be used for cooking operations. Electrostatic precipitators (ESPs) will also be installed at the exhausts of the kitchens to capture potential particulate emissions and the location of the exhaust will be sited vertically upward and away from the nearby air sensitive uses as far as practicable. As such, potential air quality impacts associated with gaseous emissions from kitchen operations to the surroundings are not anticipated. As the design of the Project encourages visitors to get to the Site via footbridge and pedestrian crossings, traffic flow induced by operations of the Project (eg tourist bus and private cars) is anticipated to be small and no adverse cumulative traffic emission impact during the operation phase of the Project is therefore expected. Three restaurant stacks were identified within 500m Study Area. The nearest stack is located at about 70m from the Site boundary and all the stacks were identified to be at least 30m above ground with high-rise buildings located in between. Through the interview with the stack owners, one of the restaurants indicated that Towngas was used for the cooking stoves. However, the owners of the other two stacks refused to provide stack emissions information. Nonetheless, it is anticipated that both premises are using ultra low sulphur diesel (ULSD), gaseous fuel or alternative fuel types in which emissions must comply with the requirements in the Air Pollution Control (Fuel Restriction) Regulation and its amendment of 2008. The five-year average of NO₂ (54mgm^-3) and SO₂ (22mgm^-3)data from 2005 to 2009 recorded at the Central/Western AQMS demonstrated that the ambient concentrations of the respective pollutants are low. As a result, no adverse air quality impacts are anticipated for the Project.
Extents of Exceedance	Not expected.	Not expected.
Avoidance / Mitigation Measures	The following dust control measures stipulated in the Air Pollution Control (Construction Dust) Regulations and good site practices will be incorporated into the Contract Specification and implemented throughout the construction period: · The area at which demolition work takes place will be sprayed with water or dust suppression chemical immediately prior to, during and immediately after the demolition activity; · Impervious dust screen or sheeting will be implemented for demolition of structures and renovation of outer surfaces of structures that abuts or fronts open area accessible to the public to no less than 1m higher than the highest level of the structure being demolished; · An effective dust screen will be provided to enclose scaffolding, if required, from the ground floor level of building for construction of superstructure of the new buildings; · Impervious sheet will be provided for skip hoist for material transport; · Vehicle washing facilities will be provided at the designated vehicle exit points; · Every vehicle will be washed to remove any dusty materials from its chassis and wheels immediately before leaving the worksite; · Road sections between vehicle-wash areas and vehicular entrances will be paved; · The load carried by the trucks will be covered entirely to ensure no dust emission from the vehicles; · Hoarding of not less than 2.4m high from ground level will be provided along the entire length of that portion of the Project Site boundary adjoining a road or other area accessible to the public except for a site entrance or exit; · The main haul road will be kept clear of dusty materials and will be sprayed with water so as to maintain the entire road surface wet at all the time; · Temporary stockpiles of dusty materials will be either covered entirely by impervious sheets; place in an area sheltered on the top and three sides; or sprayed with water to maintain the entire surface wet at all the time; · Stockpiles of more than 20 bags of cement, dry pulverised fuel ash and dusty construction materials will be covered entirely by impervious sheeting sheltered on top and 3-sides; · All exposed areas will be kept wet always to minimise dust emission; · ULSD will be used for all construction plant on-site; · The engine of the construction equipment or trucks during idling will be switched off; and · Regular maintenance of construction equipment deployed on-site will be conducted to prevent black smoke emission.	The following measures will be implemented for kitchens to minimize the potential kitchen fumes or stack emissions: · Electric stoves will be used; · Electrostatic precipitators (ESP) will be installed to control the oily fume and cooking odour; · Siting the kitchen exhausts away from the nearby air sensitive uses as far as practicable;; · Direct the kitchen exhausts vertically upwards; and · Provide sufficient separation distance from the nearby air sensitive uses.
Residual Impact	Not expected.	Not expected.
Environmental Acceptability	No adverse air quality impact with the implementation of mitigation measures.	No adverse air quality impact with the implementation of mitigation measures.
Noise
Assessment Points / Sensitive Receivers	N1 – Amber Lodge N2 – Ho Fook Building N3 – Old Bailey Street Police Married Quarters N4 – Cambridge Villa N5 – Chancery House N6 – Chancery Mansion	N1 – Amber Lodge N2 – Ho Fook Building N3 – Old Bailey Street Police Married Quarters N4 – Cambridge Villa N5 – Chancery House N6 – Chancery Mansion
Relevant Criteria	Daytime (0700-1900 hours) construction noise standards stipulated in the EIAO-TM is Leq 30min75 dB(A) for all domestic premises on any day not being a Sunday or general public holiday for general construction works. General construction works during the restricted hours follow the criteria set in the GW-TM. These are: 1. LAeq, 5min 65 dB for area with Area Sensitivity Rating of B for all days during the evening (1900-2300 hours) and general holidays (including Sundays) during the day and evening (0700-2300 hours); and 2. LAeq, 5min 50 dB for area with Area Sensitivity Rating of B for all days during the night-time (2300-0700 hours)	The criteria noise limits for planning purposes are set out in the EIAO-TM as follows: · the total fixed source noise level at the facade of the nearest NSR is at least 5 dB(A) lower than the appropriate Acceptable Noise Levels (ANL) as specified in the IND-TM; or · the prevailing background noise level (for quiet areas with level 5 dB(A) below the ANL). Based on the above EIAO-TM and IND-TM specification, daytime and evening (0700-2300 hours) noise limit for N1-N3 and N4-N6 is 59 dB(A) and 54 dB(A), respectively. The night-time (2300-0700 hours) noise limit for N1-N3 and N4-N6 is 50 dB(A) and 49 dB(A), respectively.
Results of Impact	The predicted unmitigated noise levels at NSRs ranges from 79 to 89 dB(A). With the implementation of mitigation measures, the noise levels predicted at NSRs ranges from 67 to 75 dB(A).	The predicted noise levels during day-time and evening time period at NSRs range from 52 to 56 dB(A). The predicted noise levels during night-time period at NSRs range from 42 to 49 dB(A).
Extents of Exceedance	Without the implementation of mitigation measures, exceedance up to 14 dB(A) is predicted. With the implementation of mitigation measures, noise levels at all NSRs comply with the criteria.	Not expected.
Avoidance / Mitigation Measures	· Good construction site practice; · Use of quiet PME; · Adoption of movable noise barriers; · Use of noise insulation sheet; and · Scheduling of PME/construction activities.	Although no adverse noise impact is expected due to the operation of fixed plant items, it is still recommended that the following good practices be implemented as far as practicable to minimise the potential impact: · Choose quieter equipment; · Include noise levels specification when ordering new plant items; · Locate fixed plant items or noise emission points away from the NSRs as far as practicable; · Locate noisy machines in completely enclosed plant rooms or buildings with suitable and practicable noise remedies; and · Develop and implement a regularly scheduled plant maintenance programme so that plant items are properly operated and serviced. The programme should be implemented by properly trained personnel. The maximum sound power levels for the fixed plant will be included in the contract specification to be issued to suppliers or contractors for the requipment. Noise Emissions from Courtyard Events and Public Address (PA) System · good management practices shall be in place, including noise monitoring, setting up a complaint hotline, and distributing advance notice to nearby NSRs. It is recommended that good management practices be implemented during both rehearsals and shows; · in any event that an outdoor event is expected, the event organizer is required to undertake noise monitoring at least at one of the affected NSR. One set of L_eq_(30min)noise measurements before and during the event should be taken; · as a fallback option, should non-compliance of the relevant noise criteria at the NSRs be identified for the event, immediate mitigation measures (such as turning down/off of music volume) should be implemented; and · the requirements of not exceeding the total sound power level (as given in Section 5.8) and noise monitoring for each independent event are specified in the event organisers’ contract document.
Residual Impact	Not expected.	Not expected.
Environmental Acceptability	No adverse noise impact with the implementation of mitigation measures.	No adverse noise impact with the implementation of good practices.
Water Quality
Assessment Points / Sensitive Receivers	· Existing stormwater drain along Old Bailey Street and box culverts along Arbuthnot Road and Hollywood Road · Victoria Harbour at about 650m from the Site · Seawater abstraction points along the seafront at about 650m from the Site	· Existing stormwater drain along Old Bailey Street and box culverts along Arbuthnot Road and Hollywood Road · Victoria Harbour at about 650m from the Site · Seawater abstraction points along the seafront at about 650m from the Site
Relevant Criteria	· Water Pollution Control Ordinance (WPCO) (Cap. 358); · Environmental Impact Assessment Ordinance (Cap. 499. S.16), Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM), Annexes 6 and 14; · Technical Memorandum Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland and Inshore Waters (TM); · Practice Note for Professional Persons on Construction Site Drainage (Prop PECC PN 1/94); and · Hong Kong Planning Standards and Guidelines (HKPSG).	· Water Pollution Control Ordinance (WPCO) (Cap. 358); · Environmental Impact Assessment Ordinance (Cap. 499. S.16), Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM), Annexes 6 and 14; · Technical Memorandum Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland and Inshore Waters (TM); and · Hong Kong Planning Standards and Guidelines (HKPSG).
Results of Impact	Given the scale and nature of the construction work, with the implementation of good construction and site management practices, adverse water quality due to site runoff and general construction activities is not anticipated. The amount of sewage to be generated will be about 30 m³ per day. The existing toilet facility of the CPS will be available to the construction workforce. The sewage will be discharged to the public sewer. If necessary, portable toilet will be provided on site to ensure that sewage from the site staff is properly collected. No adverse impact water quality is anticipated due to the treatment and disposal of sewage generated from the workforce.	It is estimated that up to about 565 m³ of sewage will be discharged per day. According to the Sewerage Impact Assessment of the Project, the two existing 150mm diameter public sewers along Hollywood Road and Old Bailey Street will be maintained for future use and no improvement to the existing sewers is required.
Extents of Exceedance	Not expected.	Not expected.
Avoidance / Mitigation Measures	Prior to the modification works, perimeter cut-off drains to direct off-site water around the site will be constructed and internal drainage works and erosion and sedimentation control facilities implemented. Channels, earth bunds or sand bag barriers will be provided on site to direct potential contaminated runoff to the on-site slit trap before discharged to the stormwater drains. The design of any slit removal facilities will be based on the guidelines in Appendix A1 of ProPECC PN 1/94. Vehicle and plant servicing areas, vehicle washing bays and lubrication bays will, as far as possible, be located within roofed areas. The drainage in these covered areas will be connected to foul sewers via a petrol interceptor. Oil leakage or spillage will be contained and cleaned up immediately. Waste oil will be collected and stored for recycling or disposal, in accordance with the Waste Disposal Ordinance. The stormwater discharge from the Site will be monitored as part of the routine monitoring under the WPCO licence, if applicable. The existing toilet facilities of the CPS will be available to the construction workforce. The sewage will be discharged to the public sewer system.	Not required.
Residual Impact	No residual impact.	No residual impact.
Environmental Acceptability	No adverse water quality impact with the implementation of good site practices and mitigation measures.	No adverse water quality impact is expected.
Waste
Assessment Points / Sensitive Receivers	CPS	CPS
Relevant Criteria	· Waste Disposal Ordinance (Cap 354); · Waste Disposal (Chemical Waste) (General) Regulation (Cap 354C); · Land (Miscellaneous Provisions) Ordinance (Cap 28); and · Public Health and Municipal Services Ordinance (Cap 132) - Public Cleansing and Prevention of Nuisances Regulation · Hong Kong Planning Standards and Guidelines · Waste Reduction Framework Plan, 1998 to 2007 · Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes (1992) · WBTC No. 32/92, 2/93, 2/93B, 25/99, 25/99A, 25/99C, 12/2000, 12/2002 · ETWBTC No. 33/2002, 19/2005 · DevBTC No. 6/2010	· Waste Disposal Ordinance (Cap 354); · Waste Disposal (Chemical Waste) (General) Regulation (Cap 354C); · Land (Miscellaneous Provisions) Ordinance (Cap 28); and · Public Health and Municipal Services Ordinance (Cap 132) - Public Cleansing and Prevention of Nuisances Regulation · Hong Kong Planning Standards and Guidelines · Waste Reduction Framework Plan, 1998 to 2007 · Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes (1992)
Results of Impact	It is estimated that 12,900 m³ of excavated materials, 3,540 m³ of public fills and 890 m³ of construction waste will be generated during the construction phase. With respect to the scale of the construction activities, it is anticipated that the quantity of chemical waste to be generated will be small (less than a hundred litres per month during the construction phase). It is also estimated that about 130 kg of general refuse will be generated per day by the construction workers.	It is estimated that general refuse (9,250 kg per day) and food waste (460 kg per day) will be generated during the operation phase.
Extents of Exceedance	N/A	N/A
Avoidance / Mitigation Measures	C&D material will be segregated on-site into inert and non-inert materials and stored in different containers or skips to facilitate reuse of the inert materials and proper disposal of the non-inert construction waste. Specific areas of the work site will be designated for such segregation and storage if immediate use is not practicable. The contractor will register as a chemical waste producer with the EPD. Chemical waste will be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes. General refuse will be stored in enclosed bins separately from construction and chemical wastes. The general refuse will be delivered to the transfer station or landfill, separately from construction and chemical wastes, on a daily basis to reduce odour, pest and litter impacts. Recycling bins will be provided at strategic locations to facilitate recovery of aluminium can and waste paper from the Site. Materials recovered will be sold for recycling. At the commencement of the construction works, training will be provided to workers on the concepts of site cleanliness and on appropriate waste management procedures, including waste reduction, reuse and recycling.	Chemical waste will be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes. General refuse and food and beverage waste will be stored in enclosed bins and disposed of at the tipping area on a daily basis to reduce odour, pest and litter impacts. Recycling bins will be provided at strategic locations to facilitate recovery of aluminium can and waste paper from the Site. Materials recovered will be sold for recycling
Residual Impact	No residual impact	No residual impact
Environmental Acceptability	No adverse environmental impact associated with the handling and disposal of waste.	No adverse environmental impact associated with the handling and disposal of waste.

10 Conclusions and Summary of Environmental Outcomes