volume 1 - non technical summary december 2011ch2m...halcrow group limited has prepared this report...

A9(T)/A85 Interchange RedevelopmentVolume 1 - Non Technical Summary

December 2011

Non-Technical Summary

A9 (T)/A85 Interchange Redevelopment

Perth and Kinross Council

December 2011

Halcrow Group Limited

City Park, 368 Alexandra Parade, Glasgow G31 3AU

tel 0141 552 2000 fax 0141 552 2525

halcrow.com

Halcrow Group Limited is a CH2M HILL company

Halcrow Group Limited has prepared this report in accordance with

the instructions of the client, for the client’s sole and specific use.

Any other persons who use any information contained herein do so at their own risk.

© Halcrow Group Limited 2011

Non-Technical Summary



December 2011

Environmental Statement - Non Technical Summary

Document history




This document has been issued and amended as follows:

Version Date Description Created by Verified by Approved by

1.0 08/12/2011 Final for Issue Mike Roberts Louise Hill Lawrie

Wilson


Contents

1 Introduction 4 1.1 Background 4

1.2 Environmental Impact Assessment 4

2 Project Description 4 2.1 Need for the Scheme 4

2.2 The Proposed Scheme 5

2.3 Construction of the Scheme 5

2.4 Alternatives Considered 5

3 The EIA Process 5 3.1 Overview 5

3.2 Scoping & Consultation 6

4 Environmental Impacts 6 4.1 Air Quality 6

4.2 Noise and Vibration 7

4.3 Cultural Heritage 8

4.4 Ecology and Nature Conservation 8

4.5 Landscape Effects 9

4.6 Visual Impact 9

4.7 Pedestrians, Cyclist and Community Effects 10

4.8 Land Use 11

4.9 Vehicle Travellers 12

4.10 Road Drainage and the Water Environment 12

4.11 Geology and Soils 13

4.12 Socio-Economic Assessment 13

4.13 Polices and Plans Assessment 14

4.14 Cumulative Impacts 14

4.15 Material Resources 15

4.16 Summary 15

5 Next Steps 16

Appendix

Appendix A Figures


1 Introduction

1.1 Background

This document is a non-technical summary (NTS) of the Environmental Statement

(ES) for the proposed A9(T)/A85 Interchange Redevelopment (hereafter referred to as

“the proposed scheme”).

The proposed scheme is a road improvement scheme that is being promoted by Perth

& Kinross Council in support of the development of the upcoming Local

Development Plan. Halcrow Group Ltd. were commissioned by Perth & Kinross

Council to develop the proposed scheme.

The A9(T) is the main trunk road between Stirling and Inverness which passes along

the western edge of the city of Perth. The A85 is both a local and trunk road which

runs between Perth and Crieff. The proposed scheme lies at the junction of the two

roads (centred on OS Grid Reference NO 085 248), and is shown on Figure NTS 1-1

(Appendix A).

1.2 Environmental Impact Assessment

Perth & Kinross Council’s Development Management Department confirmed the

need for an Environmental Impact Assessment (EIA) of the proposed scheme in April

2010. An EIA is required under European and Scottish legislation to identify the

potential for environmental impacts to occur as a result of the proposals.

The Environmental Statement (ES) sets out the findings of the assessments

undertaken in 2011 as part of the EIA, and the NTS presents the key findings

presented within the ES.

Given that the proposed scheme impacts upon the trunk road network, the EIA was

undertaken using the guidance published within the Design Manual for Roads and

Bridges (DMRB), non-statutory guidance and professional judgements. Further to

the guidance utilised by the project team the assessments were further informed

through site visits and consultation with statutory consultees and key stakeholders.

2 Project Description

2.1 Need for the Scheme

The development of Perth is currently constrained by topography (Kinnoull Hill),

and the River Tay. To the west of Perth, lies the opportunity for development along

Crieff Road and Almond Valley; however this is unlikely to be acceptable without

major road improvements. The proposed scheme was identified as a

recommendation in the Adopted Perth Area local Plan (1996) and in the Perth &

Kinross Council Local Development Plan Main Issues Report (2010).

The identified key issues within the existing road network which the proposed

scheme seeks to alleviate are:


• Congestion issues on the A85 during both morning and evening peak times,

congestion also occurs when events take place at McDiarmid Park Football

Stadium;

• Lack of adequate access into the Inveralmond and Almond Valley Development

Areas from Crieff Road; and

• The layout of the A9(T)/A85 junction creates conflicts between local and strategic

road users.

2.2 The Proposed Scheme

The works comprise the creation of a new interchange between the A9(T) and the A85

incorporating the regrading of the adjacent land. The proposed scheme will include

new slip roads to the A9(T), new link roads to the A85, a diversion of the Perth Town

lade, the provision of a Sustainable Urban Drainage System (SUDS), a new pedestrian

/ cycle bridge and the diversion of an Asserted Right of Way.

The proposed scheme is set out on Figure NTS\1-2 (Appendix A).

2.3 Construction of the Scheme

It is assumed that construction of the proposed scheme will commence in 2013 and

will last for a period of approximately 18 months.

2.4 Alternatives Considered

Five alternatives were assessed through the DMRB process, each of which was a new

junction which included a link road to the north of McDiarmid Park Stadium. Each

of the alternatives were considered to have some negative environmental impacts,

with the creation of new embankments and the diversion of the Perth Town Lade

watercourse being the key issues identified. The option taken forward for assessment

as part of the EIA was deemed to be the option which created the best balance

between the benefits and costs of the scheme in terms of the environment, economics,

accessibility and traffic flows in the area.

3 The EIA Process

3.1 Overview

The EIA is an essential part of the design process which enables an unbiased

assessment to be undertaken and allows the different elements of the scheme to be

assessed and consulted upon. The information gathered is then used to inform the

final detailed design of the proposals.

The objectives of the EIA process are as follows:

• To identify and assess the environmental impacts (both positive and negative)

of the construction and operation of the scheme, taking into account the

surrounding environment and the views of the consultees;

• To propose and commit to measures that reduce / avoid / offset negative

impacts and to enhance beneficial impacts of the proposed scheme; and


• To predict the significance of the residual impact upon the environment.

3.2 Scoping & Consultation

Following the EIA Screening Opinion that an EIA was required for the proposed

scheme, an EIA Scoping Report was submitted to Perth & Kinross Council in April

2011 and was subsequently passed to the Statutory Environmental Consultees for the

proposed scope of the EIA to be considered.

Following the consultation period, it was considered that the following

environmental topics would be assessed in the EIA and reported in the ES:

• Air Quality;

• Noise and Vibration;

• Cultural Heritage;

• Ecology and Nature Conservation;

• Landscape Effects;

• Land Use;

• Pedestrians, Cyclists and Community Effects;

• Vehicle Travellers;

• Road Drainage and the Water Environment;

• Geology and Soils;

• Socio-Economics;

• Disruption Due to Construction;

• Policy and Plans Assessment;

• Cumulative Effects; and

• Material Resources.

4 Environmental Impacts

4.1 Air Quality

The proposed scheme is located within the Perth Air Quality management Area

(AQMA).

The site clearance and construction phase will temporarily affect local air quality

through the generation and subsequent depositing of construction dust. Potential

dust impacts on local air quality have been considered at all sensitive receptors near

the proposed construction activities. Emissions to air will also arise from the use of

plant and haulage vehicles related to the site. However the increase in daily traffic

flow is not expected to be significant in relation to the existing local air quality.


The assessment took into account, the air quality effects due to traffic associated with

the scheme. Some properties located closest to the scheme may experience a slight

reduction in local air quality.

In order to mitigate against the potential for emissions to the atmosphere during the

construction phase, Best Practicable Means (BPM) will be adopted including

measures such as switching engines off when not in use, wheel washing of

construction vehicles and sheeting of stockpiles and lorries to prevent wind blown

dust. With these measures in place, complaints due to dust should be avoidable.

There are no mitigation measures proposed for the operation of the scheme as the

resulting air quality effects are not expected to be significant at sensitive receptors.

The scheme is expected to lead to an overall improvement in local and regional air

quality.

4.2 Noise and Vibration

Given the proximity of certain receptors to the development site, it is considered

likely that the closest residential receptors may be sensitive to short term construction

noise impacts. However, the extent to which construction noise is audible or

considered significant will be dependent on the position of the construction activity

on site.

The assessment shows that during construction, residential dwellings within 15m of

the works located at the new link road roundabout on Crieff Road are likely to

experience noise nuisance. This will occur when the works are at the closest point to

these receptors, but noise levels will decrease as the works begin to move further

away. For receptors that are located 50m or more from the works, all activities will

result in noise levels below the acceptable daytime levels,

In order to ensure that temporary construction noise levels at the closest sensitive

receptors can be minimised, mitigation measures have been proposed.

During the operation of the scheme, initially there is considered to be a positive effect

with greater numbers of receptors predicted to experience a noise decrease than

increase. However, over the next 20 years there is predicted to be increases in road

traffic noise due to predicted traffic growth on the roads.

It is always recommended that relevant guidance and standards are used to minimise

noise nuisance where possible. Careful selection of working methods and

programme, and the use of regularly maintained and appropriately silenced

equipment will be used.

During the operation of the scheme, although there are locations where an increase in

noise has been predicted, the overall absolute noise levels at these locations remain

low. As such, noise mitigation measures for operation are not recommended in the

ES, however further consideration will be given to acoustic fencing along the scheme

during the detailed design process.

Following detailed identification and implementation of appropriate mitigation

measures during the construction phase, and the implementation of a suitable


Construction Environmental Management Plan, the overall noise impact at local

sensitive properties will be reduced.

4.3 Cultural Heritage

Huntingtower Castle (Scheduled Monument, Category A Listed Building and

Property in Care) is the most significant cultural heritage resource within the study

area. Ruthven House (Category B Listed Building) is the second most significant

receptor

With respect to non-designated buried archaeological sites, both the ‘triple-ditched’

linear features and the former formal garden east of Ruthven House will lose small

areas of buried remains associated with them, and McDiarmid Park Stadium will see

the removal of its north stand. This will amount to an adverse impact which is

irreversible and the surviving remains will be diminished as a result.

The Perth Town Lade will see a substantial section of its alignment altered, through

replacement of its historic alignment to a new one around the base of a new

embankment. As this feature is an integral part of the historic landscape in the area,

its alteration is considered to be an adverse impact.

Sensitive landscape planting will be put in place to reduce the impacts to the cultural

heritage receptors of the area, in addition, measures to record the present alignment

of the Perth Town Lade will be undertaken prior to construction. Where a high

potential for buried archaeology has been identified investigations will be undertaken

prior to construction to determine the presence and value of the resource.

Following the implementation of the identified mitigation measures, some adverse

effects remain although these are only slight. The most significant impact will be

upon the non-statutory McDiarmid Park Stadium which will see one of its stands

removed to accommodate the proposed scheme.

4.4 Ecology and Nature Conservation

The Ecology and Nature Conservation assessment considered the potential for

environmental impacts on UK and EU protected species; species of local importance;

and sites designated for their nature conservation interest.

Ecological surveys were undertaken covering a range of habitats and species; these

included a Phase I Habitat Survey, Ancient Woodland survey, otter, red squirrel, bat,

fish and River Corridor surveys.

The results of the surveys showed potential impacts to the ecology of the area,

however, the impacts were assessed and appropriate mitigation measures were

recommended to reduce, offset or avoid any negative impacts identified.

Mitigation will include all works to be in accordance with relevant best practice to

prevent accidental damage to retained habitats, e.g. fencing off trees to be retained,

control of run-off and dust, and adherence to appropriate Construction industry

guidelines.

The key mitigation measure to be considered during the design stage is to limit the

amount of ancient woodland which will need to be felled. This also applies to the


non-designated mature trees along the Perth Town Lade. Furthermore, measures

such as the inclusion of enhancement measures (such as otter ledges in the culverts

and riparian planting along the diverted Perth Town Lade) have also been

recommended as a result of the surveys.

The residual impacts of the scheme include negative impacts as a result of the loss of

woodland, but beneficial impacts to the running water and river corridor habitats.

4.5 Landscape Effects

The study area lies on the western edge of Perth city on the edge of the River Almond

valley. The surrounding land uses are residential, industrial, commercial and

agricultural.

There are no statutory national landscape designations within 2km of the

development site. However a section of the proposed scheme runs through a locally

designated Area of Great Landscape Value (AGLV), and parts of the scheme cut

through areas of Ancient Woodland.

Potential landscape impacts resulting from the scheme will likely include:

• Introduction of infrastructure elements associated with the proposed scheme,

including road surface, barriers fences, SUDS ponds, bridges, culverts, signage

and lighting; and

• Alterations to landform, land use, pattern, boundaries, vegetation and

watercourses.

These aspects will result in a change to the local landscape characteristics, which has

the potential to cause a significant impact to the landscape. Significant impacts will

occur through the creation of new embankments, the diversion of the Perth Town

Lade and the removal of woodland planting throughout the scheme.

Detailed mitigation measures have been identified to reduce, offset, or avoid impacts

to the landscape of the area including extensive woodland planting, the grading of

new embankments to connect them to the existing topography of the area, and

creating a new section of the Perth Town Lade with associated habitat creation. The

landscape mitigation plan is set out on Figure NTS 1-3, (Appendix A).

The alteration of the existing topography of the area and the removal of large

amounts of woodland will result in adverse impacts to the landscape of the area,

however the sensitive design and planting of the diverted Perth Town Lade will

result in a positive impact to the surrounding environment through increased

planting and habitat creation.

4.6 Visual Impact

A number of businesses, community facilities, residential properties and footpaths

will have a view of the proposed scheme. The visual impact assessment sets out the

anticipated changes to the views from these receptors that will occur as a result of the

development of the proposed scheme.


During the construction and operation of the proposed scheme, a notable change will

occur to the local views through the creation of new embankments and road

infrastructure has the potential to cause a significant impact to certain visual

receptors, in particular local residents and users of the A9(T)/A85 roads.

As well as the general change in land use and the creation of new structures affecting

views, impacts from street lighting may also occur across the scheme. However,

similar road infrastructure does exist in the existing situation around the A9(T)/A85

junction so the degree of change will inevitably be limited.

The most severe impacts are likely to be to those residential properties located

adjacent to the A85, and to McDiarmid Park Stadium which will see the demolition of

its North Stand.

Mitigation measures have been proposed to reduce the impact that the proposed

scheme will have upon the existing views, these measures are set out on Figure NTS

1-3 (Appendix A) and include extensive woodland planting across the scheme and

high quality designs of the bridges and gateway features on the A9(T) and A85.

The implementation of the mitigation strategy will reduce the adverse impacts during

the construction and operation of the scheme, however, given the extensive

earthworks proposed, and the inclusion of significant new structures there are likely

to be long-term negative impacts to some views within the study area.

4.7 Pedestrians, Cyclists and Community Effects

During the construction of the proposed scheme impacts to the pedestrians, cyclists,

equestrians and community facilities of the study area are likely to occur resulting

from:

• Temporary changes in journey lengths;

• Temporary closures or diversions resulting from the severance to paths

including Rights of Way and proposed Core Paths;

• Increased noise and vibration for facilities adjacent to the proposed works;

• Temporary reductions in the amenity of journeys resulting from the presence

of construction activities, and nuisance dusts; and

• Temporary traffic management during the works resulting in changes to

journey times or alternative routes being required.

Key impacts will be the closure of the existing pedestrian crossing of the A9(T) during

the construction period resulting in an increase in journey times for existing users as

well as the removal of the North Stand of McDiarmid Park Stadium which will

reduce stadium capacity.

The operational impacts that are likely to occur as a result of the proposed scheme

include:

• New traffic movements around the A9(T) / A85 junction and associated roads;


• A reduction in capacity of McDiarmid Park Stadium (Previous discussions

with St Johnstone Football Club confirmed that this is acceptable1) which will

be made more accessible by the new road layout;

• Increased safety resulting from the provision of a new pedestrian / cycle bridge

over the A9(T); and

• Permanent diversion of Right of Way 2/1 (TP285) (as seen on Figure NTS\1-4,

Appendix A the diversion has two possible routes which will be confirmed

during the detailed design period).

The design of the proposed scheme has taken into account the need to continually

maintain access for pedestrians, cyclists and equestrians, and to also maintain

accessibility to community facilities along the roads and paths directly affected by the

scheme. In the long-term community severance and accessibility will also be

improved through the provision of the new pedestrian / cycle bridge and improved

signage throughout the scheme.

During the construction of the scheme it is not possible to mitigate the temporary

closure of the pedestrian crossing of the A9(T).

During the operation of the scheme some negative impacts may remain. The

inclusion of the new pedestrian / cycle bridge and improved traffic flows and signage

throughout the study area will lead to positive impacts for accessibility and

community severance in the long-term.

4.8 Land Use

The scheme will result in the following potential impacts to Land Use:

• A direct loess of agricultural farm land from Newton Farm, the Mains of

Huntingtower Farm and the farmland owned by the Bob Reid 1999

Discretionary Trust to the west of the A9(T);

• A direct impact to McDiarmid Park Stadium resulting from the demolition of

the north stand;

• Improved access to community facilities such as McDiarmid Park Stadium and

the Perth Crematorium;

1 Enterprise and Infrastructure Committee Report, North West Perth Expansion Area Study,

August 2009


• Improved access for land zoned for development at Newton Farm, as well as

providing the potential for future access provision to the development land to

the south of the Inveralmond Industrial Estate.

Mitigation measures recommended for reducing the impacts to surrounding land

uses include financial compensation for the loss of agricultural land and the removal

of the north stand of McDiarmid Park Stadium, and returning areas of land not

required for the long-term operation of the scheme to their former use.

There will also be long-term beneficial impacts to the surrounding land uses with

areas of development land identified in the development plan proposals, and sites

which have active planning permission status made more accessible through the new

road arrangements, and also through the provision of the new pedestrian / cycle

bridge.

4.9 Vehicle Travellers

The views from the road network affected by the scheme will be heavily influenced

by the creation of significant new earthworks, the removal of wooded areas, and the

formation of two new bridges over the A9(T). Driver stress levels may be affected

during the construction of the scheme as journey times increase through the

implementation of temporary traffic management measures. During the operation of

the scheme, the stress levels experienced on the existing road network will not change

significantly.

Views from the existing road network will be mitigated through the implementation of

effective landscape mitigation.

Signage throughout the scheme will help to mitigate driver stress through reducing

confusion levels for motorists on the network.

The implementation of an effective mitigation strategy will result in vehicle travellers

experiencing no significant effects following the implementation of the scheme.

4.10 Road Drainage and the Water Environment

There is potential for the scheme to impact on surface water, ground water and

drainage as a result of the construction and operation of the scheme. To

accommodate the scheme, the Perth Town Lade will be diverted and culverted in two

locations. (See figure NTS 1-2 (Appendix A)). The design of this diversion does not

result in any negative impacts to the water environment.

The ES has assessed the potential impacts and proposed mitigation measures to

minimise any impact that will be encountered.

The key sources of potential impact during construction are:

• Potential for silt being washed off earthworks (i.e. cuttings, embankments and

temporary stockpiles) and into watercourses by rainfall;

• Accidental spillage of fuels, lubricants, hydraulic oils etc. from plant and

storage areas; and


• Potential impact on groundwater resource from any dewatering operations.

The key sources of potential impact during operation are;

• The potential for material deposited on the road being washed off during

rainfall events during the operation of the highway;

• The consequences of accidental tanker or other spillage on the receiving

environment; and

• The potential from flooding of the Perth Town Lade.

A combination of good design and effective management should mitigate potential

impacts. Good working practices and design standards will be adopted that result in

minimal risk to the local water environment regime both during and following

construction.

An assessment to assess the operational effects of the road was undertaken using

specific guidance. The results showed that the scheme passes the runoff quality

assessment without any mitigation being proposed. However the scheme has

included Sustainable Urban Drainage Systems which will receive the discharge from

the drainage network associated with the road.

In order to mitigate the potential flooding of the Perth Town Lade, effective operation

of the sluice gate is essential. The proposed Almondbank flood protection scheme

will also reduce flood risk to the development (the Flood Risk Assessment is

presented in full in the appendices of the ES).

4.11 Geology and Soils

The proposed scheme is unlikely to impact upon areas of contamination or mineral

extraction sites, nor will the development of the scheme result in any significant risks

to human health or the water environment. No designated geological sites will be

impacted by the proposals.

Best practice measures such as the storage of fuels or oils on site were identified for

the continued protection of human health and the soils and geology during the

construction period.

Although there will be a physical change to the geology of the study area as a result

of the scheme, no significant residual impacts are anticipated to occur during either

the construction or the operation of the scheme.

4.12 Socio-Economic Assessment

The proposed upgrade represents major road improvement works which is likely to

result in a number of employment opportunities for manual workers. However it is

unlikely that the works will create further spin-off jobs.

Access to local businesses will be negatively impacted upon in the short term, while

works are being carried out. However completion of the project will bring about

improved traffic flows and access to the local business.


The scheme design involves land take, including 13.446ha of agricultural land within

the boundary for the scheme. The loss of this resource may result in loss of income

for the land owners.

A key impact of the scheme will be the implementation of a pedestrian / cycle bridge

at the site of the existing at-grade crossing of the A9(T). This crossing will

significantly improve both the safety of the crossing and the accessibility of the

Inveralmond Industrial Estate and the wider countryside from Perth resulting in a

significant long-term beneficial impact to the local population.

Mitigation measures for the socio-economics impacts of the proposed scheme

include:

• The demolition of the North Stand of McDiarmid Park Stadium should be

undertaken during the football off season.

• Compensation for the removal of the north stand of McDiarmid Park Stadium

will be agreed between Perth & Kinross Council and St Johnstone Football

Club.

• During the site works, there are likely to be delays and diversions to the road

network. This shall be mitigated by giving the general public including local

businesses advanced notice of all traffic management measures to be

implemented during the construction of the scheme.

The remaining impact following the implementation of the mitigation

measures identified above relates to the loss of prime quality agricultural land

which landowners will require to be compensated for.

4.13 Polices and Plans Assessment

This assessment has determined that the proposed scheme is in line with national,

regional and local planning policies. The scheme has been developed from the

recommendations of the Perth Area Local Plan (1996) and will support the

development sites identified in the plan. The junction improvements are also seen as

a priority in the Perth & Kinross Council Local Development Plan Main Issues Report

(2010).

The loss of agricultural land, and an area of land within the locally designated Area

of Great Landscape Value (AGLV) are seen as adverse effects, however, because of

the need for the proposed scheme in order to support the proposals within both the

existing adopted Local Plan (1996), and the Main Issues Report (2010) these impacts

can be reduced to resulting in no significant effects following the implementation of

the mitigation measures detailed throughout the ES.

4.14 Cumulative Impacts

The cumulative impact assessment took into account a variety of developments

within Perth and the surrounding areas. Key impacts included the potential adverse

impacts to biodiversity, landscape and pedestrians / cyclists. However, beneficial

impacts are likely to be experienced through improved air quality and accessibility.

As each new development is subjected to the planning system, cognisance should be


given to existing schemes and the committed environmental mitigation to ensure

linkages and opportunities for environmental enhancements are maximised.

4.15 Material Resources

The ES sets out an assessment of the material resources required for the construction

of the A9(T)/A85 Interchange Redevelopment. Although this assessment is not a

requirement under the guidance, it has been undertaken due to the importance of

material resources on schemes such as this. The assessment focuses on the materials

used for the construction of the scheme, and the waste management steps to be

followed.

The implementation of the mitigation measures identified in the ES will enable the

detailed design team and the appointed contractor for the works to reduce the carbon

footprint and the quantity of waste of the scheme.

4.16 Summary

Further detail of the environmental impact assessments that have been carried out for

the proposed scheme and the proposed mitigation measures are set out in detail in

the ES. Please refer to the ES should you require detailed technical information for

the environmental disciplines summarised above.


5 Next Steps

The results of the EIA for the proposed scheme have been set out in the ES. This is

available for viewing throughout the consultation period during daytime working

hours at the address of The Applicant (Perth & Kinross Council):

Perth & Kinross Council

Pullar house

Kinnoull Street

Perth

PH1 5GD

The ES has also been made available for viewing on the Perth & Kinross Council

website – www.pkc.gov.uk

Hard copies of the ES and Non-Technical Summary (NTS) are available for £250 or on

CD / DVD for £10, requests for this information should be made in writing to Perth &

Kinross Council.

Comments on the proposals and the information contained within the ES can be sent

in writing to Perth & Kinross Council’s Transport Planning Manager at the above

address. The consultation period will be determined by Perth & Kinross upon receipt

of the documentation; however the consultation will last for a minimum period of 4

weeks.


Appendices


Appendix A Figures

NTS\1-1

NTS\1-2

NTS\1-3

NTS\1-4

Halcrow Group LimitedCity Park, 368 Alexandra Parade, Glasgow, G31 3AUTel +44 (0)141 552 2000 Fax +44 (0)141 552 2525www.halcrow.com

volume 1 - non technical summary december 2011ch2m...halcrow group limited has prepared this report...

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