o o .&1. Highways Department o ,ft, ~e~e; Harbour Link Office o o Agreement No. CE 27/92 o

o COUNTRY PARK SECTION ~B~IIIJt AND BRIDGE &5T:I1. •

. PRELIMINARY DESIGN STAGE 2 ~=M~]J~~~t ------

Country Park Section - ling Kau Bridge ~ff0~fx - ITit.~

Environmental Assessment - Executive Summary lili.lwH! -titi~

FREEMAN FOX MAUNSELL o

c c c c c c Environmental Impact Assessment " (, , Executive Summary c June 1994 c / c c c c c c c c o o o c c o o o o o o o o c FREEMAN FOX MAUNSELL - Ting Kau Bridge o Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c c c TABLE OF CONTENTS o c 1. INTRODUCTION c 1.1 Background o 1.2 Purpose and Objectives of this Environmental Impact Assessment 1.3 Approach c 1.4 Legislation and Assessment Criteria Used in the Assessment c o 2. PROJECT OVERVIEW 2.1 Route Description 2.2 Structural Components J c 2.3 Construction c 3. STUDY AREA AND ENVIRONMENTAL BASELINE c 3.1 Environmental Baseline 3.2 Key Existing and Committed Sensitive Receivers

4. ENVIRONMENTAL IMPACTS

4.1 Introduction c 4.2 Air Quality Impacts 4.3 Noise Impacts c 4.4 Water Quality Impacts 4.5 Waste and Spoil Management 4.6 Landscape and Visual Impacts c 4.7 Community Issues .4.8 Ecology 4.9 Risk Assessment 4.10 Haul Road Impacts c 5. ENVIRONMENTAL MONITORING AND AUDIT c c 6. CONCLUSIONS AND RECOMMENDATIONS c 6.1 Ting Kau Bridge 6.2 Haul Road Impacts c c c c Page CON - 1 c c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge c Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c

"\ c 1. INTRODUCTION c 1.1 Background Route 3 Country Park Section (CPS) comprises approximately 15.5 km of roadway c connecting north west in the south to Yuen Long and the Circular Road in the North. Ting Kau Bridge (TKB) is the major southern c component of Route 3 CPS and'together with the and Yuen Long Approach Road (fLT & YLA) (which extends from Ting Kau in the south to Au Tau in the north), will become a major element in 's land transport c; infrastructure. Route 3 will be a vital link to serve the growing traffic demand from China, the north west New Territories, west and the expanding ports at both o Kwai Chung and on Lantau. c A Feasibility Study and first stage of the Preliminary Design for the Project were completed in October 1989 and July 1992 respectively. A second stage Preliminary c Design was undertaken in 1993. These studies considered the prospective alignments / of Route 3 CPS and culminated in the selection of a preferred scheme. In addition, c the hnprovement Works contract (fMRW) identified the need for C a haul/access road (HAR) in the Ting Kau area to remove spoil and to provide access for site vehicles to the works areas. The proposed HAR will not only be used by the C TMRW project but also the TKB and TLT & YLA projects, as the construction works for these projects will overlap in time. C In December 1993 and March 1994, the respective Environmental hnpact C­ Assessments (EIAs) were completed for the TKB and TLT & YLA Sections of Route 3 CPS. The findings of these environmental studies have been consolidated, into two C separate ElAReports. This document comprises the Executive Summary of the TKB Section inCluding supplementary papers (Haul Road and W AHMO Modelling) and ( provides a non technical appreciation of the project and summarizes the key findings C of the EIA. ( 1.2 Purpose and Objectives of this Environmental Impact Assessment

( This ElA has been undertaken to provide a comprehensive assessment of the potential impacts arising from the construction and operation of the TKB Section of Route 3 ( CPS, and has four main objectives:

C • To provide a comprehensive description of the characteristics of the proposed c developments which have environmental implications.

( • To identify, predict and evaluate the net potential environmental impacts and cumulative effects resulting from the construction and operation of the c developments. l • To identify and specify methods, measures and standards for the inclusion into the design which are necessary to effectively mitigate these impacts to l an acceptable level. ( • To recommend environmental monitoring and audit requirements in order to ensure potential impacts are maintained at an acceptable level. C

C Page - 1 C " c FREEMAN FOX MAUNSELL Route 3 ~ Ting Kau Bridge o Preliminary Design Stage 2 Ting Kau Bridge ElA Executive Summary c c c 1.3 Approach This EIA has been based on the Stage 1 Preliminary Design and with assumptions c regarding construction methods and equipment. However, the TKB Section of Route 3 CPS will be developed on a Design and Build basis, which will provide the c Contractor with a high degree of autonomy in terms of the detailed design and construction. It is therefore important that the findings and recommendations of the c EIA are appropriately developed and eventually translated into the final scheme. c 1.4 Legislation and Assessment Criteria Used in the Assessment c Assessment criteria used in the EIA are derived from the Air Pollution, Noise and o Water Pollution Control Ordinances. In addition, appropriate guidelines and methodologies have been used including the Hong Kong Planning Standards and o Guidelines. o / c 2. PROJECT OVERVIEW c 2.1 Route Description c The TKB Section extends from North West Tsing Yi across the northern via Ting Kau Bridge (Figure 1). At its northern landfall the bridge connects c to the Ting Kau Interchange and the alignment crosses both Castle Peak and Tuen Mun Roads. From Ting Kau Interchange (above Tuen Mun Road), the road then c proceeds northwards in the 1LT & YLA Road section towards the southern Tai Lam c Tunnel portal. The HAR runs from the proposed reclamation west of the headland between Lido c Beach and , northwards on a bridge structure across Castle Peak ( Road. A sliproad from links with the HAR, originally proposed to be used by the TMRW project. The route then runs on a steep slope north towards the Tuen Mun Road, where it divides into two branches (see Figure 2) to the c west of the alignment. ( 2.2 Structural Components c c The main features of the TKB development considered for this EIA include: • Ting Kau Bridge approach from the North West Tsing Yi Interchange which c facilitates the link to Island, the North Lantau Expressway and Chek c Lap Kok Airport. • The Ting Kau Bridge, a dual three lane cable stayed structure, crossing the C northern Rambler Channel from Tsing Yi to Ting Kau on the main land. l • A mid channel bridge support which includes a breakwater and rock island. l • Ting Kau Interchange, comprising four sJiproads of which two are to be l constructed as part of the TLT & YLA Road Section of Route 3 CPS. l l. Page - 2 ( FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge o Preliminary Design Stage 2 Ting Kau Bridge ElA Executive Summary c c c The assumed main features of the HAR include: • Large areas of cut and fill which will be associated with the HAR. Two c temporary steel bridges will be required for the crossing of Castle Peak Road. In the north the road will bridge the associated stream course three c times. There will be major areas of cut and fill and supporting embankment works on the western side of the stream and its associated Valley. c Embankment works to support the road will infringe upon portions of the c stream bed and bank. o • A reclamation/seawall which will be constructed off the headland and will be used as a works area. It is anticipated that it will be constructed using a block wall on a dredged foundation producing 11O,OOOm' of dredged spoil which will require disposal. A large area of cut will occur east of Lido o Beach, immediately north of the proposed reclamation; o • A concrete batching plant covering an area of approximately 2,500m2 will be I located on the reclamation. There will be a need for one barge loading point c located on the reclamation for the supply of aggregate to the concrete batching plant and a second barge loading point to facilitate the disposal of c spoil. c 2.3 Construction c Construction will take place over approximately three years, and award of Tender is c scheduled for September 1994. With an earlier date of mid 1994, for the start of construction of the HAR. The construction activities include excavation and c foundation works as well as superstructure works for the bridge and road construction. The HAR will be surfaced and the construction traffic will comprise c of heavy dump trucks, heavy trucks and concrete mixers for the transportation of c spoil, fill and construction materials such as steel and concrete. ( It is envisaged that the work areas for the two interchanges will be located near the north and south landfalls of the bridge. The route itself will form a linear works site, c and there will be major concentrations of activity at intersections where embankments, sliproads an

C Page - 3 C () FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge o Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c c The Study Area of the EIA comprises the route corridor of the Alignment and c adjacent areas including Ting Kau, northwest Tsing Yi and the northern Rambler Channel. The southern component of this area (north west Tsing Yi Island), c' comprises steeply sloping, sparsely vegetated hillsides rising abruptly from the coastline. The majority of development in this area comprises light industry located c along the coastal margin to the west and north of Tsing Yi reclamation. c The mainland at Ting Kau encompasses the hillsides and coastal areas between Tuen Mun Road in the north and the southern coast line. The area between Castle Peak c Road and Tuen Mun Road is undeveloped comprising a range of gently rising hills. c From Tuen Mun Road the hills and natural countryside rise northwards towards the reaching a peak at approximately 260m. Vegetation in the c areas that are not developed consist primarily of scrub and stands of mature trees which create a green view of the hillside. The settlement pattern in the surrounding c areas is dispersed, and consists of low-rise development along the coast. c Air Quality I c The main impact source on existing air quality in the Study Area comprises existing traffic, notably on Tuen Mun Road and emissions from industry located on north west c Tsing Yi. Baseline air quality monitoring established that existing pollution levels did not exceed the Hong Kong Air Quality Objectives. However, construction of nearby c developments such as the proposed Lantau Fixed Crossing and the Tuen Mun Road ( improvement project may contribute to air pollution in terms of dust and vehicle emissions. ( c Noise Background levels in the vicinity of the alignment are currently low (in the region of ( 50-55 dB (A)), reflecting the relatively quiet nature of the Study Area. c Water Qulility c Receiving water bodies in the Study Area comprise the northern Rambler Channel c and a stream draining to Lido Beach. The marine water quality in the northern Rambler Channel is generally poor. A major source of impact is the Pearl River, C which delivers significant quantities of sediments and industrial effluent to local marine waters. In addition, the water in the area contains high levels of E-coli l primarily due to the discharge from sewage and stormwater outfalls located on the mainland coast between and . C C C ( l l l l Page - 4 C c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge c Preliminary Design Stage 2 Ting Kau Bridge ElA Executive Summary c c Gazetted beaches in the Study Area are situated along the Rambler Channel (with one c located on Ma Wan). These beaches have been graded by EPD:- c Beach Status (

( Approach Very Poor TingKau Very Poor c Casam Poor Lido Poor c Gemini Poor Hoi Mei Wan Poor c Anglers Poor c TungWan Fair c * Source : (Bacteriological Water Quality of Bathing Beaches in Hong Kong. EPD 1992) I c Sediment Quality ( The extent of the marine sediments in the Study Area were found to be extremely c variable. In some locations they are seriously contaminated with heavy metals as well as other pollutants such as nitrogen, phosphorous and hydrocarbons. Results from c four separate sediment analysis studies in the area have been reviewed. While the studies are not comprehensive their results indicate that some of the marine mud is c contaminated by metals particularly at the surface and also at varying depths down c to a depth of approximately 2.5m. c 3.2 Key Existing and Committed Sensitive Receivers Key existing sensitive receivers .within, and adjacent to the Study Area have been c identified in relation to their susceptibility to noise, air quality, industry, cultural, ( recreational, ecological, visual and livelihood aspects. These are shown in Figure 3 and include: c • The northern Rambler Ch!lIlIlel; c • Residential development at Ting Kau; • The gazetted beaches along Rambler Channel and on Ma Wan; ( • The Fish Culture Zone on Ma Wan; • The Temple on Lido Beach; and c • . Aquatic life including fish species and the Chinese White Dolphin. ( c 4. ENVIRONMENTAL IMPACTS c 4.1 Introduction ( The TKB impacts are discussed below according to the specialist subject areas. The HAR was assessed separately and a summary of the impacts is given at the end of L this section. The HAR assessment includes cumulative impacts of nearby construction projects including the TMRW and TKB projects. l. l Page - 5 ( c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge

o Preliminary Design Stage 2 Ting Kau Bridge ElA Executive Summary c c c 4.2 Air Quality Impacts c Construction Construction dust is predicted to exceed the I-hour and 24-hour desirable maximum c concentrations. This is due to the large construction area and the number of c concurrent construction activities assumed in the computer modelling which will not actually occur in practise. Practical mitigation measures have been proposed to c reduce these high dust concentrations to an acceptable level. However, it should be noted that other construction projects operating simultaneously in the area are c expected to contribute to the impacts on local air quality. c Operation c Results of the air quality assessment indicate that the level of Respirable Suspended Particulates will not exceed the assessment criteria for the years 200 1 and 2011. / c Concentrations of nitrogen dioxide in close proximity to the alignment however, are c likely to approach the Air Quality Objective standards along Tuen Mun Road in the year 2001, and along the bridge/viaduct in 2011. c Although pollution levels immediately adjacent to both Route 3 CPS and Tuen Mun c Road are expected to be significant, pollutants are expected to disperse sufficiently over distance such that sensitive receivers in the Study Area should not experience c pollution levels exceeding the Air Quality Objective maxima. c 4.3 Noise Impacts c Potential noise impacts arising from both construction and operation were assessed c under two scenarios; with and without mitigation. c Co nstruction c Construction noise is predicted to significantly affect receivers in the Ting Kau area. With noise mitigation incorporated in the form of fixed solid barriers around c significant noise sources, 10 residential dwellings would still be subject to noise levels exceeding the noise criteria. These are shown in Figure 4. It is recommended that c these dwellings should be provided with noise insulation for the duration of the c construction period. c Operation Computer noise modelling has indicated that only one dwelling will be subject to c noise levels slightly above the assessment criteria of 70dB(A). It would require c extensive road side noise barrier(s) on the new or existing roads to mitigate this and it is therefore recommended that this one dwelling should be provided with noise ( insulation as this is considered to be a more cost effective and practical mitigation measure.

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( Page - 6 c (; FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge

G Preliminary Design Stage 2 Ting Kau Bridge ErA Executive Summary C C 4.4 Water Quality Impacts C C Construction Key issues will be the prevention of soil, construction materials, chemicals, sewage C etc., from entering the water course and thus the marine waters. Impacts on water C quality may occur both as a result of surface water run-off and during dredging and disposal (as part of the breakwater and seawall construction), particularly in view of C the likely contaminated nature of the marine sediments. To minimise potential impacts, strict mitigation measures should be adopted in relation to controlling run­ C off, in addition to which the selection of methods and equipment to be used for dredging (once decisions are made regarding location and extent of dredging) will be C important factors in pollution control. Special handling and disposal arrangements will need to be made with respect to any contaminated material. C Operation C I C Potential impacts arising post construction are changes in the hydraulic regime (flows, currents etc.) and associated changes in water quality resulting from the development C of the breakwater, reclamation and bridge piers in the northern Rambler Channel. In order to determine the extent and nature of potential effects, hydraulic and water C quality computer modelling has been carried out and the findings were that the imposition of the TKB and its associated reclamations (as proposed in the Stage 1 C Preliminary Design) should not cause significant long term water quality impacts.

C 4.5 Waste and Spoil Management

C The main environmental issues to be addressed with regard to spoil management and fill requirements for the TKB are minimisation of the amount of spoil arisings, the C desire to balance excavation and fill and also collection, handling and disposal C arrangements. C A review of fill and excavation requirements has established three main areas of construction activity where surplus spoil will be generated: North West Tsing Yi, C Ting Kau and at the Rambler Channel. Viable spoil disposal options comprise use of spoil within the project or reuse for fill in other projects. Potential environmental C effects from spoil disposal activities can be considered to be essentially limited to construction related impacts, although further consideration will need to be given to C end state impacts during detailed design.

C It is proposed that excess material from the Ting Kau area will be brought by trucks C down to the barge loading point at the reclamation. C At the site specific level, a range of environmental protection measures will be required including: measures ensuring transport and access routes bypass sensitive C areas such as residential premises or areas of high ecological interest; and design and programming of site disposal activities to minimise long term impact and maximise C environmental gain.

C Stockpiling of spoil may result in adverse impacts however as details are unavailable, this is most appropriately covered during the detailed design. C

C Page - 7 C c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge c Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c c c 4.6 Landscape and Visual Impacts c­ Landscape and Visuallmpads Three elements of the TKB Section of Route 3 CPS were identified as being likely c to create significant visual and landscape impacts:- c • the North West Tsing Yi Interchange; c • the TKB crossing; and c • the Ting Kau Interchange. The most severe and permanent impact on landscape character will occur as a result c of the Ting Kau Interchange. The potential impacts will be compounded when the subsequent TLT & YLA Road Section is constructed, adding a further two elevated c sliproads to the north of the proposed route.

/ c With regard to visual intrusion, the impacts of the Bridge itself will remain significant throughout its operational life. However the most significant post construction impact c will be the introduction of the elevated structnre, moving traffic and the resulting c intrusion on receivers within the Ting Kau area. c Landscape Mitigation

(. Both temporary and permanent landscaping measures have been identified to reduce the landscape and visual impacts of the project during and post construction. c Measures to be adopted during construction largely consist of good site practice and c temporary screening. Post construction, detailed landscape works will be required. In addition, permanent c mitigation measures should include design considerations and in particular attention to the detailed alignment of the route and selection of appropriate colours and c materials etc. The natnre of landscape works follow broad guidelines previously c described in the Stage 1 Preliminary Design, Costing and Programme Report, and should be discussed with the relevant implementation and maintenance authority at c an early stage. These guidelines share a common theme with other landscape works proposed for the area outside of Route 3 CPS. ( c 4.7 Community Issues The project will affect the local community during construction and operation through c severance (both perceived and actnal), loss or distnrbance of amenity and recreational c resources, landtake, and general disruption and distnrbance. C Construdion l Impacts will primarily affect sensitive receivers at Ting Kau, surrounding properties, and users of recreational areas along the coast and in the wooded hillside to the north. C These will generally be temporary in natnre (severance, distnrbance etc.) but are however considered significant as they may last for up to 4 years. ( c ( Page - 8 ( c FREEMAN FOX MAUNSELL Route 3 ~ Ting Kau Bridge c Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c c Impacts on recreational/amenity value are of concern in relation to the beaches and c the mainland woodland. The most significant impact will be to the east end of Lido Beach where the proposed reclamation for the bridge pier and construction area for c the bridge piers are located. Movement of construction materials and vehicles along access roads, noise and dust nuisance, and disruption of accessibility will contribute c to deterioration of this recreational resource, and may result in closure of the beach c during construction works. c Operation c The main issues include community severance, landtake, noise, air quality and visual impacts which in turn create impacts in relation to development potential and land c values. c Residual impacts from construction activities will largely depend on the effectiveness and efficiency of mitigation measures adopted in earlier stages. The permanent loss c of amenity will be significant with respect to Lido Beach and to a lesser extent for / Casam Beach. Although there will be significant visual impacts and reduced access c resulting from the development over the hillside, the importance of this in terms of c recreation is less and therefore potential impacts will be limited. c 4.8 Ecology c Terrestrial Ecology c The primary residual impact on terrestrial ecology will be the loss of land area and associated habitat on the Ting Kau side. Although these habitats are mixed with c suburban residential and recreational land uses, they are somewhat protected due to the general remoteness of the areas affected. As a result, they harbour mature, c closed canopy forest cover near a small freshwater stream. In the absence of wild ( fire, the woodland canopy could progressively extend uphill from the stream valley (above Castle Peak Road) and could provide a productive, stable, and unusual habitat c in this area. c Although it is not certain that all of this woodland and riparian habitat will be removed during the construction phase, it is assumed that much of the existing ( vegetative cover will be lost. It would require several decades for the existing mature woodland areas to be revegetated from bare ground. Restoration of the existing ( species diversity would require a similar timespan, during which much of the value c of the area for birds and invertebrate wildlife will be lost. c Marine Ecology Some mobilization of toxic materials in sediments from the construction and reclamation areas will be a residual impact of the construction phase. However, the l impact will be short-term and given the poor baseline condition of the local flora and fauna, the effects are not likely to be severe. C C C

C Page - 9

C c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge

c Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c ,r The breakwater and other marine structures may give rise to some residual impacts, c due to its effect on current patterns and water flows. However a modelling study has indicated that the design structure would not cause Significant water quality impacts. c The marine ecology impacts are therefore likely to be limited to direct loss in the c 'foot print' area of the reclamations and possibly longer term cumulative impacts. c 4.9 Risk Assessment C' The risk assessment has enabled a preliminary estimate of the probability that a ship will collide with TKB, with sufficient force to cause significant damage. For this to C occur, it is estimated that the vessel must be > 5,000 dwt.

o The risk assessment predicted that for ships of this size the overall chance of collision is 1 in 100 per year. For vessels > 15,000 dwt, the chances of collision would be C reduced to about 1 in 200 per year, and for vessels> 30,000 dwt, the chances would be about 1 in 400 per year. C / C The risk of collision (and damage to the bridge) can only be reduced by the provision of further physical protection around the bridge supports. The nature and extent of C these measures will necessarily depend upon the design criteria for the bridge. It is possible that different criteria and design principles will be appropriate where there ",--._1 are risks to people (due to an incident involving dangerous goods or partial collapse of the roadway). It is therefore recommended that further consideration should be c' given to the need for more detailed technical studies, to determine the extent and c nature of any necessary design measures. c 4.10 Haul Road Impacts c Construction The HAR will be constructed simultaneously with some works for nearby projects o and due to the steep topography of the area will require significant cut and fill c activities. The main potential environmental impacts are predicted to be the cumulative impacts arising through elevated dust and noise emissions affecting nearby c sensitive receivers. Mitigation measures have been recommended to reduce the potential impacts, however with regard to dust emissions, the qlitigation measures ( proposed may be inadequate to bring dust levels within acceptable limits when particularly dry and windy conditions prevail. Consequently, stringent dust control c measures must be strictly enforced. c Water quality impacts are predicted as a result of construction site run-off into fresh water receiving bodies, and loss of material in the form of suspended solids to the c marine environment during the construction and reclamation process. Mitigation measures have been identified and should be included in contract documentation to c ensure the implementation of such measures. c The cutting activities will result in spoil arisings, however these arisings are not c anticipated to be problematic in terms of their effect on the environment. Quantities in excess of the fill requirements are recommended to be used for the proposed C' reclamation at Ting Kau Headland, and good site practice should ensure that potential impacts from fugitive emissions are maintained at an acceptable level. C

C Page - 10 ( FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge

Preliminary Design Stage 2 Ting Kau Bridge ElA Executive Summary

The visual impact is predicted to be severe for those receivers with direct views, including residential properties north ofTuen Mun Road and Castle Peak Road. The HAR is a short duration project and therefore these impacts will be relatively short term in nature. Careful attention to restoration once the construction phase is completed is therefore essential. In order to minimise the long term impact on terrestrial ecology, a habitat restoration progranune should be implemented. It is r proposed that the progranune should focus on replanting rather than natural recolonisation due to the long timescale required for the latter, and the desire to " establish a habitat suitable for recolonisation by birds and invertebrate species.

Operation

The main environmental impacts resulting through the operation of the HAR are predicted to be a result of elevated noise levels at a limited number of sensitive receivers for which mitigation at the receiver has been recommended. In addition dust emissions associated with traffic are expected to be significant, and similarly appropriate mitigation has been recommended. / r ~, Potential impacts associated with the transportation and handling of spoil and wastes, r" including the movement of concrete and materials, and aggregate deliveries by barge, comprise adverse effects on aquatic ecology. Impacts associated with the transport r of materials can effectively be mitigated and appropriate measures have been identified. Residual impacts on aquatic ecological resources however, are anticipated ," to be severe and mitigation can be achieved following project completion. However, the necessary measures would require attention over many years due to the time C required for regrowth of mature riparian vegetation. r '-. '

r 5. ENVIRONMENTAL MONITORING AND AUDIT ~ r Environmental monitoring and audit requirements for the construction and operation '-- of the TKB Section have been identified and outline monitoring schedules and action r- plans defined with respect to air quality, water quality and noise. The effective '-- implementation of a comprehensive monitoring and audit programme is essential in ( order to:

r '- • ensure that any environmental impacts resulting from the construction and operation of the TKB section of Route 3 CPS are minimised or kept to C 'acceptable' levels at all times;

C • , establish procedures for checking that mitigation measures have been applied and are effective, and that the appropriate corrective action is undertaken if C and when required; and C • provide a means of checking compliance with environmental objectives, L recording anomalies and documenting corrective action. C In order to ensure that these objectives are achieved, monitoring and audit requirements should be incorporated into the contract documents for the project for L implementation during both construction and operation of TKB. C ( Page - 11 (, c FREEMAN FOX MAUNSELL Route 3 - Ting Kau Bridge

c Preliminary Design Stage 2 Ting Kau Bridge EIA Executive Summary c ,r As the timing of the construction and operation of the HAR will coincide with the c two much larger scale construction activities of the Tuen Mun Road Improvement Project and TKB, environmental monitoring requirements of the HAR may co-incide c in many cases with monitoring for these projects. As such, monitoring in many cases should not be duplicated, but the data used for overall assessment of cumulative c impacts. c C' 6. CONCLUSIONS AND RECOMMENDATIONS C 6.1 Ting Kau Bridge

o The EIA has been based on the Stage 1 Preliminary Design. The findings of the assessment will be addressed through both the Tender process and during detailed design when further detailed environmental evaluation is recommended. Given the Design and Build nature of the project it will be essential to update this assessment c in accordance with the actual proposed construction details, any new data such as I confirmed traffic flow predictions as well as assessment of all significant changes to the design.

Practical mitigation measures have been proposed to minimize environmental impacts and environmental monitoring and audit requirements identified to ensure impacts are maintained at an acceptable level.

c 6.2 Haul Road Impacts

( The most significant environmental impacts associated with the HAR are anticipated to be a result of construction activities, and associated noise and air quality impacts. C Mitigation has been identified and must be strictly enforced, particularly during dry C and windy conditions when dust impacts could be significant. Operational impacts will affect a limited number of sensitive receivers in terrns of noise for which mitigation at the receiver is recommended. Adverse impacts on the limited aquatic ecology in the study area is predicted to be significant. This will be difficult to ( mitigate without implementation of a project to re-create the streams course or an acceptable alternative. ( '-- ' c c

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