TAI PO DEVELO'PMENT: FORMATION & SERVICING OF AREA 12 (PART) & 39

Environmental Impact Assessment

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TAI PO DEVELOPMEr、IT:FORMATION & SERVICING OF AREA 12 (PART) & 39

Environmental Impact Assessment

Executive Su訂m且y(Final)

JUNE 1996

C O NSULTANTSIN

EN VIRONMENTAL

Room 1201, T剖 Yau Building 181 Johnston Road, Wanchai, Hong Kong

Telephone : 2893 1551 Facsimile: 2891 0305

REPORT NO.

STATUS

QUALITY ASS1JRANCE POLICY' STATEMENT

Consultants in Environmental Sciences 街叫 Ltd ìs committed to satisfying the requîrements of its Oîents at the híghest standards of professional ethics.

It ìs 出e Companyls objective to provide services which meet the required speci主cation and are produced on time în a cost-effec位ve白lanner種

In pursuit of these objec位ves， the Directors have împlemented Quality Systems whìch have achieved Third Pa向rCertl金cation to BS ENISO 的前:1994 Standard. All employees of the Company have a responsibility for qualíty.

The quality procedures are under contìnual review by Senior Management to ensure that the changing needs of the Company's Clients are met.

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DATE OF ISSUE

APPROVED BY

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rf 兮兮條7 (Director)

REMARKS: The infonnation supplied and contained within thîs report is, to the best of our knowledge, correct at the time of printing. 'Where information has been supplied by thîrd partie丸 such information is reproduced here in good f出th and CES 借助 Ltd accepts no responsibility for the accuracy of the supplied infonnation.

CES (Asi母 Ltd accepts no responsib血ty for changes made to thîs report by thîrd parties.

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Teqìtory Development Department Tai PO Development: Areas 12 (Part) & 39

EIA Executive Sumrnary (Final)

TAI PO DEVELOPMENT FORMATION AND S在RVICING OF AREA 12 (PART) & 39

ENVIRONMENTAL IMPACT ASSESSMENT EXECUTIVE SUMMARY (FINAL)

1. This Environmental Irnpact Assessrnent (凹的 Executive Summary Report summarises the 血ndings of the EIλstudy of the Tai PO Development - Formation and Servidng Areas 12 (凹的 and 39. The project proponent is the" TerritOl.y Developrnent Departrnent (TDD). The study has been undertaken by Consultants in Environmental Sciences (Asia) Limited (CES (Asia) Ltd) as subconsu1tants to Maunsell Consultants Asîa Limited. Additional spedalist inputs to the EIA study were provided by Ecosyst芒ms Ltd and Designscape Intemationa1 Ltd. This report has been produced together with an EIA Report and a Phase 1 Environmenta1 Monítoring and Audit Manual.

The Tai PO Deve10pment Project aims to comp1ete the site formation and servicing of Area39 訊社 provide the inf主剖tructure to accommodate the demand for expansion of the villages Cheung Shue Tan and Tai PO Mei.. and improve the exìsting environment of the two villages. The Tai PO Development site is located in the North East New Territori的in T剖 PO Areas 12 (Part) and 39, between Shatîn and Tai Po. The majority of the site is currently bounded by the Chinese Universîty, the recently dis刊lsed Kowloon軸CantonRailway (KCR) embankment and the To10 Highway. A new KCR track w扭扭centlyconstructed alongside the To10 Highway. The development site of Ar也立學缸。 isrestricted to two villages, Cheung Shue Tan and Tai PO Mei. Area 39 is approxìmately 25 heζtares of 日at 1ow-lying reclaimed 1and which was formed under the τ010 Highway Project. The location of the project site is given in 扭扭lre ES1.

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3. 立le context of the development is shown 仙 Fi伊re ES2. Various other developments are in progress, or are planned, in the vicinity of the site, includîng:

• Pak Shek Kok Reclamation (Public Dump), which is the preferred site for a Science Park;

• widening of Tolo Highway; • the Christopher's Home site redevelopmεnt， presently under construction; and • constructìon of a J apanese Internatîonal School.

在 The engineering works for the Tai PO Development Project are divided înto Phases 1 and 11. Phase 1 will develop the northern half of Area 39 which will ultimately be used as a Hong Kong Institute of Education sports ground. The duration of Phase 1 works is exp仗ted to be from April1997 until December 1998 and include the following activities:

• site formation of the northern part of Area 39 (by adding fill to raise the ground level and providing assocîated drains). All f山 w也 nee益 to be imported. providing an access road for the site by wideníng the existing Yau King Lane and construction of a 主oad (Road L39/1 呻 north) to link Area 39 to T剖 PO Road. Part of Road L39/1 w笠l be constructed on the recently dis畔used KCR embankment and track.

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EIA Executive Summary (Final)

Th金 con蚊ruction impacts of Phase 1 and the operational impacts of Phases 1 & II have been assessed in the 自A， and the 在ndings are summarised below. The location of sensi泣ve receivers local to the Development are shown in Figure ES3.

Construction Imoacts (Phase n

5. A noise assessment for the Phase 1 construction works was undertaken and indicates that, with the exception of the Villa Castell residential estate, noise levels at sensitive receivers will comply with the guidelines (ie a non-statutory daytime limit of 話鈴(A)) and are therefore acceptable. The study showed that with implementa泣。n of recommended mìtigation measures, the noise impacts at Villa Castell can be reduced to wìthìn established guideline levels. Therefore it is recommended that the following mitigation measures be impl叩lented and adhered to at Villa Castell:

• Noise levels arisingfrom road improvement earthworks be reduced to acceptable levels by ensuring that the hand held breaker is acoustically screened at source.

• Noise levels arising from remaining road improvement works be reduced to acceptable levels by ensuring that all activities involving Powered Mechanical Equipment are effectively screened at source from the line of sight of the Villa Castell. Since the Villa Castell directly overlooks the proposed site for these construction activities, it will be necessary to schedule works în such a way that areas of activity are at all times screened from the line of sight by an effective acoustic barrier 任m high)

• Noise levels arisingfrom retainingwall installation be reduced to acceptable levels by ensuring that vibratory pokers are effectively screened from the line of sight by means of an effective acoustic barrie主任 m hîgh).

6. The construction du討 levels for Phase 1 construction works were asses鉛d andshow 出atdust levels are predict話 to comply with air quality stand紅色 for dust (îe there w也 benoexceedances of the 1.品our 位伊拉ty guideline level or the 挂毛∞r Air Quality Objective for Total Suspend設dP位ticulates) at vario巴s representa說ve air sensìtive receivers 斟venthat the propos吋 good site prac泣ce procedures are adopted during construction.

7. The ecological assessment shows that since 80% of the study area is a1ready disturbed by human activity, the overall e<:.:ologica1 impacts of the proposed Phase 1 works on the e泣sting environment are predicted to be small. N 0 faunal species of conservation sigr吐血cance were recorded. One protected plant species was found whîch can be transplanted. There is also a small area of woodland habitat whîch will be los t. The ecological impacts identified for stream areas in Phase 1 will include 10ss of aquatic habitat due to culverting. However, due to the present low ecologica1 value of the stream areas, the impacts are not considered to be ecologically significant.恥 Mitigation for the 10ss of woodland habitat from Phase 1 is considered necessary due to the va1ue of thìs type of habitat to wildlife. The areas available for rev芒geta註on on-site are s挂ghtly larger than those to be lost It ìs re∞mmended that revegetation be carried out using native plant species, with species selection based on communities to be lost and the commercia1

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EIA Executive Summary (Final)

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avai1ability of seedlings. Exotic species can be utilised for rapîd esta說ishment and as nurse plants for the native species. It is also recommended that individuals of the protected species Pavetta hoη詐。ngensís found in the woodland be transplanted.

Water quality ìmpacts during the Phase 1 construction will be centred 00 the potential contamination of the runoff catchment. Impacts may arise due to sediment or waste materials entering the watercourse and thus the marine environment. In view of the potential impacts/ preventionβnd control measures have been recommended to reduce the impacts of construction activities to within established guideline levels.

The EIA study has recommended that guidelines on good site constructiòn practices are incIud巴d as contractual controls (incIuded in Appendix D of the EIA Report) to cover the following: • dust emissions from construction activi位es;• control of water runoff from the construction sites, inc1u岳ing s~dimentation

basins; • reduction of noise generated from construction 鑫C註vi註es;• correct handling and disposal of solid waste.

10. The study has also recommended that an Environmental Monitoring and λudit Programme is undertaken to monìtor compliance of emissions and discharges from the construction activities with environmenta1 standards and 0句ectives. 1n the event of no仔細compliance trus will enable an ìmmediate response to review practices and mitìgation measures and provide further mitiga技信n if required. A separate Phase 1 Environmental Monìtoring and Audit Manual has been prepared as part of the EIA giving recommendations on the basis for contracting a闊的lplementing an independant Environmental Monitoring and Audit Programme.

。口erational Imoacts (Phaseml & rD

11. An assessment of noise impacts arising solely from the Phase 1 Development was undertaken an這 shows that although noise levels would be dominated by the contribution from traf自C on Yau King Lane, these would comply with Hong Kong noise standards (HKPSG criteria). The noise assessment of the Phase 1 在 II Development identi主ed th討road traf在c noîse standar:ds (under HKPSG critena) were exceeded at the majority of representa丘ve sensitive receivers. 甘1.e ass登ssment predicted that with no mitigation, a m斜拉lum of approximately 39 proper註紹說 Villa Castell would be eligîble for indirect technical remedies. 1n these areas/ noise levels are dominated by the noise contribution from Yau King Lane and from tr誰能c generated by the development. Elsewhere, sensitive receivers were largely adjacent to the Phase 11 Development 紅紹I an寸 predominantlyaffected by existing noise from the Tolo Highway. The study re∞mmendation is that 4m noise barriers will be 把這uired at Villa Castell (indicated on Figure ES4) during and following Phase II to mitigate these effects, and reduce noise impacts to comply with the established standards (ie to within HKPSG c社te說a:).

12. Noise impacts were also assessed from the prop的ed transport terminus (in Phase II) an是the planned development zones adjacent to 出e Phase II Development area. To protect

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Territory Development Department Tai PO Development: Areas 12 (Part) & 39

自A Execu丘ve Summary (Final)

planned development adjacent to the terminus, a precautionary approach has been taken and a 3m hlgh earth bund recommended as a mitigation measure to reduce future noise impacts (see Fi部lre ES5). At other planned development areas, the noise levels were predominately influenced by Tolo Highway, and traffic generated by the Phase 1 & II Development did not represent a constraint "to other planned development areas.

13. An assessment of the impact of vehic1e emissions was undertaken, based on predíctions made for the year 2011 (including the activities of both Phase 1 and II Development). This predícted that there would be no impacts from traffic generated by the development and that emissions levels from this source would comply with I-Iong Kong 是ir quality standàrds. This assessment also considered the effect of poten世al secon是ary impacts arising from noise barriers. Therefore there are no predicted constraints for the Development from this source種

1是 There are, howev肘I predicted to be air quali可， constraints for the Development arising from traffic emissions from To1o H.ighway. Similarly, the Development itself will place constraints on the Tolo Hîghway widening scheme. For planned air sensitive uses located within the fu仙re Development site, predícted 叫r quality levels indícated that a minimum buffer distance of 扭扭扭t 1.5m above ground) in the ye位 2000， and 益。 metres in the year 2011, would be required from the Tolo Highway in order to meet air quality standards (the Hong Kong Air Quality Objectives). Tms will also be a constraint on the future alignment for the T010 Highway Widening project. The study recommends that no aír sensitive uses are located within thls 已uffer area.

15. The 色cological assessment of Phases 1 and II shows resultant losses of 1.61 ha of woodland, 0.36 ha of shrubland, 0.22 ha of grassland, .3.7 ha of agrïculture/orchard, and 怒.3 ha of various disturbed 訂閱s. With the exception of a two small areas of wood1and, none of the habitats surveyed were of par且cular conservation or ecological sigr吐血cancebased on floral composition. Som給 of the habitats to be lost (woodland and agriculture/orchard) were found to be of use to local wildlife as foraging and nesting habitat.甘lese wou1是 be mitigated by the planting of woodland recommended for Phase I. The ecological impacts identified for stream areas will include 10ss of the lower reaches of Tai PO Mei Stream to channelling during Pha說江 Mitigation of these impacts is not possible while retainîng the planned flood control function of the modified stream channels. Due to the present low ecological value of these areas, the împacts are not of consider吋 to 已e of ecological signi血cance.

16. The assessment of vis立al impacts from Phase 1 Development identi皇ed that, with the exc企ption of some accommodation blocks of the Cmnese University and localised impacts on villages, the vast m司o吐ty of s的話註ve receivers will be the tho協議nds of travellers on the KCR and the To10 Highway. These receivers will be subjected to a very specific form of visual ímpact; being of quite a high level yet very temporary and thereby less íntrusive. With suitab1e landscape provi泣。n， the inten是ed use of the proposed land would lead to an acceptable level of visual impact. Of more specific concem is the Yau King Lane access road which will give rìse to high levels of vi認al impact, but which can be

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Territory Development Department Tai PO Development: Areas 口 (Part) & 39

EIA Executive Summary (Final)

mitîgated by suitable design and landscape treatment. The vi站在l.assessment of Phase II identî自ed a concem with the proposals for works within the valley to the south-west of the site, between Wong N剖 F剖 and PO Min 前llage. These are considered to give 丘seto high leyels of visual 扛npac丸 though some mitigation would be possible in the detailed design of these schemes.

Conc1usions

17. Following consideration and assessment of the Phase 1 construction works 在nd the operational characteristics of the Phase 1 & II Development, the EIλ 的sessment h在Sidentified adverse impacts in relation to the following.

• Construction noise impacts arisìng at the Villa Castell. If the r合commendedmitigatîon measures of a 哇m hlgh noise barrier are implemented, then it is predicted that noise levels c訟 be reduced to within established guideline levels, and there vyill be no significant residual impacts.

• -. Operational noise impacts arising at the Villa Castell from Phase 1 & II Development. If the recommended mitigation measures of a 接m high noise barrier are implemented, then it is predicted that noise levels can be reduced to withln established guideline levels, and there will be no significant residual ìmpacts.

• Operational noise impacts arising at the T芝加sport Terminus on adjacent planned development zones “ If th登 recommende是 mitig豆豆on measure of a 3m high earth noise bund is implemented, then it is expecte是 that there w迫 b皂泣。 signi主cantresidual impacts.

• Opera世onal 剖r quali句， impacts arising at from Tolo Highway on the planne是Development.電If the recommended mitîgation measure of a 50m buffer zone from the Highway to air sensitive uses (for the year 2000) 的 implemented, then it is expecte吐 that there will be no significant residual impacts.

• Ecological impacts arising during Phase 1 Development. If the recommended mitigation measures of transplanting and woodlan是 planting are implemented, then it is expected that there will be no significant residual impacts.

• Some residual visua1 impacts remain associated with the stream works betv峙的Wong Nai Fai and PO Min villages. Options for further mitigation remain available at the detailed design stage.

18. With the implementation of the mitigatîon measures as recommended above, the study concludes that the construction works of the Phase 1 construction, and operational characteristics of the Phase I &立 Development are within establish登d guideline levels.

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