GEOTECHNICAL STATEMENT OF INTENT - Planning Inspectorate · reviewed as part of the TAR and PSSR in order to determine the likelihood and extent of any mining or contamination beneath

GEOTECHNICAL STATEMENT OF INTENT M4 Junctions 3 – 12 Managed Motorways

Working on behalf of the Highways Agency

M4 J3-12 Managed Motorways Geotechnical Statement of Intent

M4 Statement of Intent Issue 3

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Document Control The Project Manager is responsible for producing and maintaining this document throughout the project life cycle. He/she may appoint a project team member to act as a gatekeeper who will control access to and authorise amendments to this document.

Revision History This document is updated at each and every stage of the (PCF) project life cycle.

Version Date Description Author 1 30/10/09 Draft Sutha Paramannatham 2 31/08/10 Draft Sutha Paramannatham 3 30/11/11 Draft Philip Brown

Reviewer List

Name Role Jan Marsden Senior Geotechnical Advisor

The reviewers of this document are likely to include the DfT Sponsor, SSR Technical Specialists and members of the Integrated Project Team. Approvals The HA Senior Manager is accountable for the content of this document

Name Signature Title Date of Issue

Version

The original format of this document is copyright to the Highways Agency.

Document Title M3MM Geotechnical Statement of Intent Author Owner Distribution Document Status



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Contents Contents.........................................................................................................................2

1 Introduction..........................................................................................................4

2 Objectives.............................................................................................................7

2.1 Scheme Objectives................................................................................................7

2.2 Geotechnical Objectives ........................................................................................8

2.2.1 Preliminary Sources Study (PSS) 8

2.2.2 Ground Investigation 8

3 Existing Information ............................................................................................9

3.1 Topographical Maps ..............................................................................................9

3.2 Environmental Site Sensitivity Maps and Datasheets ...........................................9

3.3 Geological Maps and Memoirs ..............................................................................9

3.4 Highways Agency Information ...............................................................................9

3.5 Area 3 GAMP Information......................................................................................9

3.6 Mining Information ...............................................................................................10

4 Geotechnical Risk..............................................................................................11

5 Proposed Studies and Investigations..............................................................16

5.1 TAR......................................................................................................................16

5.2 Ground Investigation............................................................................................16

5.3 Other Reports ......................................................................................................17



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6 Specialist Consultation .....................................................................................18

7 Programme and Cost ........................................................................................19



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1 Introduction

In January 2009 the Government announced that hard shoulder running (HSR) would be extended to some of the busiest parts of the Highways Agency’s major road network and this initiated the MM programme. The MM concept builds upon the success of the M42 MM scheme which produced the following results after 12 months operation:

• Driver ability to predict weekday journey times had improved by 22 per cent. • There had been a reduction in fuel consumption by 4 per cent. • Vehicle emissions had reduced by between 4 and 10 per cent. • The results of user consultation demonstrate that MM had proven to be a

success for drivers.

In addition the number of accidents decreased from an average of 5.08 a month to 2.25 a month, based upon 36 months operation.

The M4MM scheme was included in the review of motorway links identified in the DfT’s Advanced Motorway Signalling and Traffic Management Feasibility Study as a potential priority for HSR. This review provided an initial assessment for these schemes and concluded that there were strong benefits for providing HSR for the entire scheme lengths. The schemes were included in the national roads programme announced in January 2009 with an undertaking to commence construction before 2015. Assessment work commenced accordingly.

Figure 1: Location of M4 Managed Motorways scheme



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Government policy on fiscal deficit reduction then intervened and led to increased pressure on Highways Agency budgets. In consequence the M4MM project team was required to find a 20 per cent decrease in costs from the earlier project estimate through value engineering whilst still achieving MM safety and scheme benefits. The outputs from this work were a modified MM concept known as ‘MM Evolution’. This incorporates reduced infrastructure and could have either CALR or HSR operating regimes. CALR incorporates conversion of the hard shoulder into a permanent running lane and provides a better economic return due to the increased speeds achievable by traffic before and after the peak congestion period. CALR also requires less operator input (for example no hard shoulder opening check).

In parallel with the work carried out by the M3MM and M4MM project team, the Highways Agency is developing guidance and design requirements for MM future design in the form of interim advice notes based on the premise of CALR which is the same as ‘MM Evolution CALR’ design. Therefore this document assumes that the ‘MM Evolution CALR’ design is the preferred solution for the scheme, HSR would only be considered where operationally preferable. Pending forthcoming HA policy announcements regarding the future design of Managed Motorways, there may be the alternative of hard shoulder running (HSR) utilisation where operational factors indicate it to be more appropriate. Associated policy announcements regarding the MM Future Design will be taken into account in the finalisation of the operating regime.

The project is currently in the option identification stage with stage gate assessment review (SGAR) 1 programmed for December 2011. The current scheme programme assumption is for construction to commence in the third quarter of 2015.

The scheme is currently in PCF (Project Control Framework) Stage 1 Options Identification. The Initial Options Phase preparatory work had assumed a single Hard-shoulder Running (HSR) Option in line with a standard IAN 111 solution throughout both schemes, but following an Office of Government Commerce Stage 1 review in October 2009, (which recommended a strategic review of the programme and Options Stage), several alternative options were considered in the interim Technical Appraisal Report (TAR) in 2010. Following publication of the interim TAR an updated TAR is being produced for Stage Gate Review 1 (SGAR1) in December 2011.

Schematic drawings are presented in the Technical Appraisal Report.

This document undertakes a review of the Phase 1 options from the updated TAR to identify geotechnical risks associated with the implementation of Controlled All Lane Running (CALR).

This report relates to the M4 J3 – J12 Managed Motorways, the extent of the scheme covered by this report is presented in Figure 2.



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Figure 2: Extent of the M4 Managed Motorways Scheme

The TAR provides a more detailed description of the proposed scheme and should be read in conjunction with this document.



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2 Objectives

2.1 Scheme Objectives

The Overall Scheme Objectives include the following components:

• To alleviate any existing transport and safety problems identified on the Motorway links. Once open to traffic, the project should not detrimentally affect traffic on the surrounding road network.

• To enhance the role of these major Motorway arteries by improving the currency and quality of information provided to drivers about the state of the motorway.

• To relieve congestion, improving journey time reliability, reducing the number of fatalities, casualties and incident.

• To maximise the effectiveness of mitigation of environmental impacts. Where technically feasible and economic to do so.

• To result in no worsening of the overall existing environment and to consider enhancement where feasible.

• To provide journey time reliability benefits to traffic on these links in comparison to the “do nothing” baseline set for economic appraisal of the project.

• To minimise the impact of the severance of local thoroughfares for non-motorised users.

• To support local and regional development plans and government policy.

• To ensure that the project takes into account the capacity improvements planned on adjoining routes.

• To ensure HA Network Operations are consulted on the project design and that the project is designed to suit the requirements of ongoing maintenance.

• To ensure the DfT’s Project Sponsor is kept fully informed as the study is carried out.



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2.2 Geotechnical Objectives

This Statement of Intent seeks to identify the geotechnical risks for the scheme and aims to:

• identify geotechnical and geo-environmental risks and controls at project inception;

• outline how known/suspected geotechnical risks are to be managed;

2.2.1 Preliminary Sources Study (PSS) The geotechnical objectives in relation to the scheme are to identify and quantify any geotechnical or geo-environmental issues arising from the ground, which may influence the selection of options and to provide geotechnical comment on the relative merits of the various options. Factors to be considered include the design, construction method, safety, cost and programme of construction and the geo-environmental impacts of the scheme.

It is understood that air quality, noise, drainage, land quality, ecological, archaeological and utilities issues are to be covered in separate studies.

2.2.2 Ground Investigation When the preferred option has been identified, a ground investigation will be carried out to provide geotechnical and geo-environmental parameters to allow detailed design of the scheme, retaining structures and structural foundations.



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3 Existing Information

3.1 Topographical Maps

Ordnance Survey Computer Aided Design (CAD) tile and landline information is already held for the section of motorway under consideration.

The Ordnance Survey topographical maps (Explorer Sheet 159, Reading, Wokingham & Pangbourne, Explorer Sheet 160, Windsor, Weybridge & Bracknell, Explorer Sheet 161, London South, Explorer Sheet 173, London North, all 1:25,000 scale ) covering the motorway will also be reviewed.

3.2 Environmental Site Sensitivity Maps and Datasheets

An Envirocheck report for M4 J3-12 was obtained from Landmark and will be reviewed as part of the TAR and PSSR in order to determine the likelihood and extent of any mining or contamination beneath the route.

3.3 Geological Maps and Memoirs

• BGS Geological Map Sheet 268 Reading (2000) Solid and Drift Edition (1:50,000)

• BGS Geological Map Sheet 269 Windsor (1999) Solid and Drift Edition (1:50,000)

3.4 Highways Agency Information

The HA Geotechnical Data Management Systems (HAGDMS) will be interrogated to determine the condition of the existing earthworks and identify any known failures or areas at risk. Historic site investigation data held on HAGDMS and will be reviewed.

3.5 Area 3 GAMP Information

The Area 3 Geotechnical Asset Management Plan which covers the M4 Motorway is managed by Enterprisemouchel. Enterprisemouchel have been contacted and have provided information on existing earthworks problems and proposed remediation schemes falling within the scheme extents.

Table 3.1 below provides a summary of proposed earthwork remediation projects between junctions 3 and 12 on the M4.



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Earthwork Number Earthwork Number Earthwork Fault Proposed Works Scheduled

Start Date

6696 A308 (M) SU888788

Tension cracking and shallow rotational failures

Re-grade slope 2012 to 2013

47609 WB M4 MP 56/8 Tension cracks and failures

Ground Investigation

2012 to 2013

329 WB M4 MP55/5+69

Tension cracks and failures

Re-grade slope February 2012

Table 1 Summary of GAMP Remediation works

The planned remedial earthworks summarised in Table 1 will be addressed and discussed in more detail in the PSSR produced for this scheme.

3.6 Mining Information

The Arup Geotechnics (1991) “Review of Mining Instability in England and Wales” will be reviewed, along with information shown on the historical plans received as part of the Envirocheck report. The results from this review will be presented in the PSSR.



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4 Geotechnical Risk

A review of the geotechnical risks associated with the scheme has been undertaken. The risks have been evaluated using the risk evaluation matrix suggested in Part 2 of HD22/08 ‘Managing Geotechnical Risk’, which is reproduced as Table 4.1 below.

Risk Rating (R) = Probability (P) x Impact (I)

Risk (R) PROBABILITY (P) IMPACT (I)

Impact

TIME or COST

5 4 3 2 1

Very Likely 1 in 10 5 Very High 5 >20% 5 25 20 15 10 5

Likely 1 in 100 4 X High 4 5-20% = 4 20 16 12 8 4

Probable 1 in 1000 3 Medium 3 2-5% 3 15 12 9 6 3

Unlikely 1 in 10000 2 Low 2 0.5-2% 2 10 8 6 4 2

Negligible 1 in 100000 1 Very Low 1

% increase on duration of works or

project cost

<0.5%

Prob

abili

ty

1 5 4 3 2 1

Risk Ratings 1 to 4 Trivial, but no action required.

5 to 8 Tolerable, but must consider more costs effective solutions or improvements at no additional cost.

9 to 12 Substantial and work must not start until risk has been reduced.

13+ Intolerable and work must not start on the project until risk has been reduced. If risk can not be reduced, project should not proceed.

Table 2 Evaluation matrix

The risk register is detailed in Table 4.2 overleaf. The register lists the anticipated geotechnical and environmental hazards associated with the works and the potential consequences of those hazards. The risk before control of the hazard has been assessed quantitatively as has the anticipated risk following the proposed response to each hazard.



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GEOTECHNICAL RISK ASSESSMENT

Risk before control

Risk after control No Hazard Consequence

P I R Mitigation Measures

P I R

1 Level of study provides limited knowledge of ground conditions Inappropriate design solution proposed 4 3 12 Undertake detailed stage 2 review in due course 3 3 9

2 Existing Earthwork Instability Failure of earthwork impacting on existing highway 4 3 12 Review existing HAGDMS information for known areas

of defect 2 2 4

3 Existing earthwork instability will case damages to the proposed cables and ducts

Disconnect the motorway communication networks 4 3 12

Review existing HAGDMS information for known areas of defect and undertake a survey at the proposed cable routes

2 2 4

4 Previous Earthworks Repairs Buildability issue regarding presence of existing structure 2 4 8

Review existing HAGDMS information for known areas of previously repaired earthworks and consult an appropriate person/team to find out any proposed works within the works area

1 4 4

5 Contaminated Ground Risk to Human health during construction 5 3 15

Review Envirocheck reports and publicly available information, Identify foundation and earthwork solutions to minimise impact from contaminated material, Undertake Ground Investigation and undertake appropriate mitigation

1 3 3

6 Presence of Landfills (at Junction with M25)

Deeper Foundations and Ground Improvement works required 5 4 20

Review Envirocheck reports and publicly available information. Undertake Ground Investigation, design out risk or relocate the works if necessary

1 3 3

7 Access to land denied by landowners

Delays to Ground Investigation and construction works 2 4 8 Restrict working practices to Highways Agency land as

far as possible 1 3 3

8 Weak and / or soft compressible ground

Deeper foundations and ground improvement works required 5 4 20

Review published geological information to identify areas of weak compressible ground, Undertake Ground Investigation and design suitable foundations

2 2 4

10 Groundwater levels

Effects on surface water drainage, Effects on stability of deep excavations, due to water ingress. Effects on earthworks stability and effects on foundation designs and construction

3 4 12

Ensure groundwater regime are unaltered by works, Ensure appropriate temporary works, Plan for appropriate temporary works using GI data, Consult preliminary GI and monitor installations, Consult GI.

2 4 8



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Risk before control



P I R

12 Mining related ground movements Impact on structure foundation type 3 4 12

Review available information and determine likelihood of encountering mine workings and carry out ground investigation and design suitable mitigation

1 4 4

13

Mineral extraction – unidentified shafts and adits, collapse of underground workings, presence of voids and presence of hazardous gases

Failure of structures and risk to human health during construction 3 4 12

Consult available information to identify any possible mining/sub-surface activity, design out risk or move works if necessary

1 4 4

14 Constrained highway boundary Requirement for earth retaining or reinforced earth solutions 5 4 20 Identify areas where highway boundary is constrained

and design solutions accordingly 1 2 2

15 Ground Investigation and construction interacting with railways

Possessions required 1 4 4 Undertake Desk study, liaise with Network Rail 1 3 3

16 Creation of contamination path way Contamination of groundwater 5 4 20

Determine contamination status of areas where required construction methods may create pathways and select construction methods accordingly

1 2 2

17

Unknown ground conditions, due to lack of investigation/lack of information on ground conditions

Over conservative design Solutions / Options selections 4 3 12 Undertake desk study and Ground Investigation 1 2 2

18 Earthworks failure during/ immediately after construction

Risk to the construction workers and the public and closure of carriageway 2 4 8

Understand soil properties and construct earthworks in accordance approved specification and geotechnical design criteria

1 4 4

19 Unknown groundwater Over conservative design 4 3 12 Undertake desk study and Ground Investigation 1 2 2

20 Flooding of water due to influence of the rivers Delays during construction 3 4 12 Check flood records and assess the likely hood of

flooding occurring 1 2 2

21 Unforeseen services

Delays during construction and foundation cannot be installed

4 4 16 Undertake Ground Investigation and Obtain service plans and use CAT scanning and hand dug inspection pits for all excavations

1 2 2

22 Unexploded ordnance Accidental explosions 3 3 9 Obtain ordnance plans, undertake Geophysical survey and undertake Ground Investigation. 1 2 2

23

Unexpected geological features, fissures, faults, solution features etc.

Unsuitable Design Solution 3 3 9 Consult historical site investigation data and Geotechnical Report to establish typical and expected ground conditions.

1 3 3



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Risk before control



P I R

24 Presence of hazardous soil borne gas arising from alluvium/peat

Risk to human health during construction 2 4 8 Consult GI information 1 3 3

25 Running on hard shoulder affects loading of existing structure

Failure of earthwork leading to closure of carriageway 4 5 20 Undertake desk study, ground investigation and slope

stability analysis for all large/at risk earthworks 1 2 2

26 Damage to existing carriageways due to foundation works

Additional cost to repair the damages 2 3 6 Ensure care is taken during construction to avoid damage to the carriageway. 1 3 3

27 Damage to neighbouring structures due to ground movement during construction

Addition cost to repair the damaged structures 3 4 12 Make sure works close to existing structures are undertaken with sue care 1 4 4

28 Obstruction to construction due to existing foundations Foundation cannot be installed 2 2 4 Undertake ground Investigation 1 2 2

29 Design conflict with known buried services Conflict during construction 4 4 16 Refer to service plans and programme for any conflict 2 4 8

30 Change to scope of works Lack of ground information for the design 2 3 6 Finalise the outline design for the scheme as soon as possible and stick to the design 1 3 3

31 Additional groundwork associated with large embankment/cuttings

Retaining walls or regarding required 4 4 16 Undertake Ground Investigation, design out risk or move works if necessary 1 3 3

32 Excessive quantities of unacceptable material, including contamination

Excessive amount of material for disposal off site and associated disposal costs 2 3 6 Undertake ground Investigation, determine level of

unacceptable material and move works if necessary 1 3 3

33 Contamination hot spots due to localised spills encountered during construction

Delays in construction works 2 3 6 Undertake chemical testing during the GI. If contamination is identified, make provision in the program for this

1 3 3

34 Groundwater contamination Leachates affects, delay site works and additional disposal costs 2 4 8

Assess the risk from information during the GI make provision for disposal of the water in an appropriate manner

1 4 4

35

Changes in environmental legislation

Additional time required to modify the documents according to the new legislation 1 3 3

Work to the latest legislation. If new regulations are to be launched during the works design to meet new legislation

1 3 3



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Risk before control



P I R

36 Restrictions on network occupancy due to other works Works cannot be completed on times 3 3 9 Program the works so they don’t conflict with any other

works/schemes on the networks 1 3 3

38 Chemical attack on buried structural elements due to soil borne contaminants

Sulphate attack on concrete leading to failure of foundation 2 4 8 Undertake ground investigation to determine level of

concrete protection necessary 1 3 3

39 Earthworks instability due to proposed cross carriageway ducts installations

Closure of carriageway 2 3 6

Use of the actual gantry structure to supply cross carriageway power and communication cables instead of ducts

1 3 3

40 Consider different solutions for foundations depending on ground investigation results.

Closure of Hard shoulder, impact on Traffic management and impact on Environment footprint

3 3 9 Use of existing MS4's and use screw piles if necessary (quick installation method)

2 3 6

42 Presence of over steep embankment at the proposed re-build bridges

Embankment work required. 2 3 6 Consider other alternative options 1 3 3

43 Presence of hazardous plants such as Hog Weed

Exposure to its sap can cause severe skin inflammations where the skin is exposed to sunlight

2 4 8

Avoid working in the areas where Hog Weed is known to be present. Always wear protective gloves and goggles if working near an area where this plant is present and cover exposed area of skin at all times.

1 4 4

Notes:

1. A ‘Hazard’ is a condition or physical situation with a potential for an undesirable event. 2. A ‘Risk’ is an uncertain event or set of circumstances that should it occur would have an effect on achieving the projects objectives. 3. Mitigation Measures include:

• Avoid the risk - by eliminating the uncertainty or using an alternative approach. • Transfer the risk - by transferring the liability of the risk to another party such as in the case of contract warranties or fixed price contracts. • Mitigate the risk - by reducing the risk to an acceptable level by making it less likely that the risk event will occur. • Accept and manage the risk - by assuming the risk as reasonable given the cost or effect on time or quality and even life.



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5 Proposed Studies and Investigations

5.1 TAR

The following is proposed in undertaking the strategic review which will provide input into the TAR, based on the options provided by the Mouchel Highways Engineering Team.

• Geology – A review of published geological mapping and existing ground investigation results.

• Mining Review – Desk top assessment of likelihood / potential extent of mining.

• Contaminated Land Review – Outline assessment of the historical land uses adjacent to the motorways and assessment of the likely scale of contaminated land impacting on foundations and earthwork solutions.

• Proposed Structures– An outline assessment of the proposed structures at the location of the new cantilever sign masts, gantries and emergency refuge areas locations along the route.

• Earthwork stability - A desk top review of the current earthwork assessment scores based on the observation risk from HAGDMS to identify possible areas of earthwork distress/instability.

5.2 Ground Investigation

A ground investigation will be carried out as part of the design for the preferred options. Such an investigation would consist of a number of boreholes at strategic locations to establish the ground conditions that may affect any of the proposed scheme design. Furthermore any ground investigation scope will take account of the available/relevant geotechnical historical information.

Further details of the proposed investigations will be submitted when the preferred option is identified and discussed in the Annex A to the PSSR.



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5.3 Other Reports

The following four reports will be produced as part of the scheme to comply with guidelines set out in HD22/08 (August 2008) and in general accordance with BS EN 1997 Part 1 and Part 2.

• Preliminary Source Study Report (PSSR) – The PSSR will cover the geological, geotechnical, geomorphological, hydrological and geo-environmental aspects of the route and the contamination risks together with a preliminary engineering assessment and likely hazards to construction.

• Ground Investigation Report (GIR) - The GIR will presents the available geotechnical information, summary of field and laboratory studies carried out as part of the scheme, interpretation of the results from the investigations undertaken, summarise the design soil parameters and develop the Geotechnical Risk Register for the project.

• Geotechnical Design Report (GDR) – The GDR will present the full details of the interpretation of design data and include layout drawings for each element of the works together with an assessment of potential contamination.

• Geotechnical Feedback Report (GFR) – The GFR will contain the records of the construction, geotechnical problems encountered during the construction and solutions implemented. The report will also contain details of the any area of the specification or standards used that should be reviewed in the light of problems encountered on site, any requirements for ongoing monitoring or maintenance requirements.



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6 Specialist Consultation

Details regarding specialist consultation has been reported and agreed separately to the Project Manager. In summary the programme in respect to the current Package Orders is as follows:

• Submission of Public Consultation Strategy - 30th November 2011

• Submission of Communication Plan/Stakeholder Management Plan - 30th November 2011

• Submission of Interim Public Consultation Leaflet - 30th November 2011

• Submission of Final Public Consultation Publicity Checklist - Date TBC at SGAR 2 stage

• Submission of Final Public Consultation Exhibition Checklist - Date TBC at SGAR 2 stage

• Submission of Final Notification of Prejudicial Development (TR111) - Date TBC at SGAR 2 stage

• Submission of Final Statement of Results of Public Consultation Checklist - Date TBC at SGAR 2 stage

• Completion of Public Information Exhibition/ Public Consultation - Date TBC at SGAR 2 stage

• Submission of Final Section 85 notice - Date TBC at SGAR 2 stage



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7 Programme and Cost

Details regarding overall programme and costs are included in the Technical Appraisal Report.

Appendix A: Summary of relevant previous investigations Tables 1.2 to 1.3 referenced from section 1.4 of this report.

Table 1.2: Summary of relevant previous investigations undertaken within the study area

HA GDMS

report

number.

HHJV

Unique

report

reference

number

Report title Date Author Details of contents

Section 1, Heston to Langley, Junction 3 to Junction 5 (Scheme Chainage 10000 to 20150)

2956 009 M25 River Thames to M4 Interchange- Report on Site Investigation

November 1976

Wimpey Laboratories

This report contains five sections; two of which are relevant to this scheme. These are the M4/M25 Eastern Interchange Site (Thorney) and the M4/M25 Western Interchange Site (Ritchings Park). The “interchange” is J4B of the M4. The whole ground investigation comprised 51 cable percussive boreholes with Mackintosh probes surrounding some boreholes. The exploratory hole logs and geotechnical laboratory and in situ testing results are included in the report.

3260 013

M4 Widening M25 (Junction 4b) to Junction 8(9), Early Implementation Scheme - Geotechnical Desk Study Report

November 1991

Acer Consultants The scheme details the findings of a desk study for a proposal to widen the M4 to four lanes between J4B and J5.

3266 017

M4 Widening M25 (Junction 4b) to Junction 8(9) - Early Implementation Scheme Geotechnical Interpretative Report

July 1992

Acer Consultants The report describes the findings of ground investigation carried out to inform the design of the motorway widening between J4B and J8/9. The report includes a summary of ground conditions, geo-environmental considerations and design recommendations.

3269 020

M4 Motorway M25 to Junction 8(9) - M4 Improvements and New Relief Road Bypassing Maidenhead and Slough. Draft Preliminary Sources Study

July 1993

Acer Consultants This Preliminary Sources Study Report is a revised version of HA GDMS Ref: 3249 and 3265 and covers relevant information relating to the M4 improvements between J4B and J8/9. A geological interpretation based on historical boreholes is included.

12713 032

M4 Improvement and New Trunk Road Links Junction 4B-Junction 8(9) - Proposed Works and Associated Risks and Liabilities – Geotechnical Report

January 1995

Acer Consultants This report provides an initial assessment into the environmental risks and liabilities which may arise from proposed ground investigation and construction associated with proposals to improve the M4 between J8 (9) and J4B.

17740 046 M4 Junction 4 to MP 34/5 - Preliminary Sources Study Report

February 2003

Mouchel This PSSR informs a scheme to develop the Network Management Information System on the M4.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


18861 063 Proposed Widening of the M4 Motorway between Sipson Road and the M25- Report on Site Investigation

January 1983

Wimpey Laboratories

This is a Ground Investigation Report (GIR) for the proposed widening of the M4 between Sipson Road and the M25. The ground investigation comprised 15 cable percussive boreholes and four trial pits. The exploratory hole logs and the geotechnical laboratory test results are included in the report.

21145 107

M4 Junction 4 to MP34/5 Network Management Information System, Phase 1 & 2 Feedback report

2003

Mouchel This report is a combined geotechnical report and geotechnical feedback report relating to works on the M4 to develop the Network Management Information System between J4 and J18. This report relates only to work between J4 and MP34/5 (between J5 and J6).

Section 2, Langley to Holyport, Junction 5 to Junction 8/9 (Scheme Chainage 20150 to 34100)

2885 008

M4 Underbridge Maidenhead, Windsor and Eton Flood Alleviation Scheme - Geotechnical Interpretative and Foundation Recommendations

July 1996

Hyder Consulting This report provides interpretation of ground investigation information for a proposed structure to carry the M4 over a flood relief channel.

3260 013

M4 Widening M25 (Junction 4b) to Junction 8(9), Early Implementation Scheme - Geotechnical Desk Study Report

November 1991

Acer Consultants The scheme details the findings of a desk study for a proposal to widen the M4 to four lanes between J4B and J5.

3266 017

M4 Widening M25 (Junction 4b) to Junction 8(9) - Early Implementation Scheme Geotechnical Interpretative Report

July 1992

Acer Consultants The report describes the findings of ground investigation carried out to inform the design of the motorway widening between J4B and J8/9. The report includes a summary of ground conditions, geo-environmental considerations and design recommendations.

3269 020


July 1993


12713 032

M4 Improvement and New Trunk Road Links Junction 4B-Junction 8(9) - Proposed Works and Associated Risks and Liabilities – Geotechnical Report

January 1995

Acer Consultants This report provides an initial assessment into the environmental risks and liabilities which may arise from proposed ground investigation and construction associated with proposals to improve the M4 between J8 (9) and J4B.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


17109 041

M4 Junction 8/9 Improvement Phase 1 - Geotechnical Interpretative Report

November 2001

Parsons Brinckerhoff

This GIR details the findings of ground investigation undertaken at J8/9 for improvements to the A404 (M). This report does not contain any factual information.

17320 045

M4 Junction 8/9 Improvement - Preliminary Sources Study Report and Earthworks Design Report

August 2002

Mott MacDonald This PSSR covers relevant information for the J8/9 improvement works. This report contains the exploratory hole records from HAGDMS Ref: 4181 and HAGDMS Ref: 17110.

17740 046 M4 Junction 4 to MP 34/5 - Preliminary Sources Study Report

February 2003

Mouchel This PSSR informs a scheme to develop the Network Management Information System on the M4.

18188 053 M4 Maidenhead, Windsor and Eton Flood Alleviation Scheme - Factual Report on Site Investigation

January 1990

C.J. Associates This report includes exploratory hole records for a ground investigation carried out for the M4 Maidenhead, Windsor and Eton Flood Alleviation Scheme. The whole investigation comprised 43 cable percussive boreholes, but only BH17 to BH22 and BH31 to BH34 inclusive are relevant to this scheme (BH31 to BH34 are missing from the report). This report does not contain any laboratory testing results.

18189 054 M4 Maidenhead, Windsor and Eton Flood Alleviation Scheme - Laboratory Test Results Site Investigation

January 1990

C.J. Associates This report only contains laboratory test results relevant to this scheme (see HAGDMS Ref: 18188 and HAGDMS Ref: 18190).

18190 055 M4 Maidenhead, Windsor and Eton Flood Alleviation Scheme - Geotechnical Report

October 1991

Ground Explorations

This is an interpretative report. It also contains ground investigation information from a previous investigation; however, only BH13 and BH14 are relevant to this scheme.

19230 065 Area 3 Footbridges, M4 Hams Farm Footbridge - Ground Investigation

June 2005 Norwest Holst Soil Engineering

This is a ground investigation report for M4 Hams Farm Footbridge. The ground investigation comprised four cable percussive boreholes, five trial pits and four inspections pits. The report includes laboratory testing.

19243 066 Area 3 Footbridge Schemes - Area 3 Footbridges M4/MP 32.1 Hams Farm Footbridge Geotechnical Interpretative Report

July 2005 Mott MacDonald This report includes interpretation of ground investigation information for the replacement of the Hams Farm Footbridge. This report does not contain any factual information.

19400 071 M4 Hams Farm Footbridge, MP 32.1 - Ground Investigation, Geotechnical Interpretative Report

June- July 2005

Norwest Holst Soil Engineering

This report contains the ground investigation information for works carried out for the replacement of the Hams Farm Footbridge.

20152 086 M4 Motorway -Class 1 Earthwork Defects, Junction 5 Off-Slip EB (Site 16) - Geotechnical Report

February 2005

Mott MacDonald This report contains interpretation of ground investigation information relating to an earthwork defect identified during Principal Inspections around J5. This report does not contain any factual information.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


20160 089

M4 Motorway - Class 1 Earthwork Defects, Site 19 at MP 47.0 WB - Geotechnical Report

May 2006

Mott MacDonald This report includes interpretation of the ground investigation information for an earthwork defect identified during a Principal Inspection between J7 and J8/9. This report does not contain any factual information.

20161 090 M4 Motorway - Class 1 Earthwork Defects - Site 17 J6 WB Offslip – Geotechnical Report

August 2005

Mott MacDonald This report contains interpretation of ground investigation information relating to an earthwork defect identified during Principal Inspections at J6. This report does not contain any factual information.

20400 098

M4 Motorway - Class 1 Earthworks Defects - Junction 8/9 Slip roads (Sites 15, 29 and J8-9)

January 2005

Mott MacDonald This report summarises available ground investigation information relevant to several defects identified during Principal Inspections around J8/9. This report does not contain any factual information.

20433 099

M4 Motorway - Class 1 Earthwork Defects - Preliminary Sources Study Report, Volume 1 J5 to 10

October 2003

Mott MacDonald This PSSR covers nine individual sites where defects are recorded between J5 and J10. The report includes exploratory hole records from HAGDMS Ref: 18152.

20563 103

M4 Junctions 4B to Junctions 12, NMIS - Preliminary Sources Study Report

2005

Mouchel Parkman This PSSR covers Phase 6 of a scheme to upgrade the Network Management Information Systems on the M4. Phase 6 covers J10 to J12.

21004 105

M4 Junction 5 to 8/9, NMIS CCTV Design - Geotechnical Report, Phase 1

March 2006

Mouchel Parkman This report covers the interpretation of ground conditions and design recommendations relating to the upgrades of the Network Management Information Systems on the M4 between J5 and J8/9. Ground investigation and laboratory test results are included.

21117 106 Area 3: M4 Junctions 5 to 7 Bridge Upgrades, Chalvey Interchange Bridges - Geotechnical Report

August 2007

Mott MacDonald This report contains interpretation of ground investigation information relating to a widening scheme at Chalvey Interchange (J6). This report does not contain any factual information.

21145 107

M4 Junction 4 to MP34/5 Network Management Information System, Phase 1 & 2 Feedback report

2003

Mouchel This report is a combined geotechnical report and geotechnical feedback report relating to works on the M4 to develop the Network Management Information System between J4 and J18. This report relates only to work between J4 and MP34/5 (between J5 and J6).

21838 111 Area 3: M4 Junction 5 to 7 Bridge Upgrades - Prince of Wales Underbridge Geotechnical Report

May 2008 Mott MacDonald This report contains the results of two phases of ground investigation works.

The first phase of ground investigation comprised two cable percussion boreholes and seven window samples and the report includes the exploratory hole logs, the laboratory test results and photographs of the samples.

The second phase of ground investigation comprised seven dynamic probe holes, nine window samples and nine machine excavated trial pits.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


24298 137 M4 J6 E/B Off-Slip MP 37/4B (EW 250) Embankment Repair - Preliminary Sources Study Report

October 2009

Enterprise Mouchel

This report covers information relevant to an embankment repair on the J6 eastbound off-slip.

24471 138 M4 J5 E/B Off-Slip MP 31/4B (EW 17555) Embankment Repair - Preliminary Sources Study Report

October 2009

Enterprise Mouchel

This report contains information relevant to an embankment repair on the J5 eastbound off-slip. The PSSR contains exploratory hole logs from HAGDMS Ref: 19261.

Section 3, Holport to Winnersh, Junction 8/9 to Junction 10 (Scheme Chainage 34100 to 46150)

1506 005

M4 Widening Junctions 8(9) to 12 - Junctions 8(9) to 10, Technical Appraisal Report

September 1994

Acer Consultants This PSSR contains relevant information for a scheme to widen the M4 between J8/9 and J10.

1512 007

M4 Widening Junctions 8(9) to 10 - Geotechnical Interpretative Report

November 1994

Acer Consultants This report describes and interprets the results of ground investigation between J8/9 and J10 for a Widening Within Land scheme. This report does not contain any factual information.

3269 020


July 1993


17109 041

M4 Junction 8/9 Improvement Phase 1 - Geotechnical Interpretative Report

November 2001

Parsons Brinckerhoff

This GIR details the findings of ground investigation undertaken at J8/9 for improvements to the A404 (M). This report does not contain any factual information.

17320 045

M4 Junction 8/9 Improvement - Preliminary Sources Study Report and Earthworks Design Report

August 2002

Mott MacDonald This PSSR covers relevant information for the J8/9 improvement works. This report contains the exploratory hole records from HAGDMS Ref: 4181 and HAGDMS Ref: 17110.

18860 062

M4 Improvements between Junctions 8(9) and 12 - Geotechnical Desk Top Study

January 1990


19430 073

M4 Motorway, Class 1 Earthworks Defects, J8/9 Slip roads, J10 on-Slip WB - Geotechnical Report

February 2005

Mott MacDonald This report includes interpretation of ground investigation information relating to earthwork defects at J8/9 of the M4.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


20110 076

M4 Junction 8/9 to 10, M4 NMIS Phase 5 - Geotechnical Report

August 2005

Mouchel Parkman

This report covers the interpretation of ground investigation information and recommendations for design of upgrades to the Network Management Information System between J8/9 and J10. The ground investigation and laboratory test results are included.

20120 080

M4 NMIS (Phase 5) - Preliminary Sources Study Report

December 2004

Mouchel Parkman This PSSR covers Phase 5 of a scheme to upgrade the Network Management Information Systems on the M4. Phase 5 covers J8/9 to J10. This PSSR contains exploratory hole records from HAGDMS Ref: 18152.

20323 093 M4 Motorway - Class 1 Earthwork Defects, Site 20 at MP 52.55 WB - Geotechnical Report

February 2005

Mott MacDonald This report contains interpretation of ground investigation information for an earthwork defect identified during a Principal Inspection between J8/9 and J10.

20400 098

M4 Motorway - Class 1 Earthworks Defects - Junction 8/9 Slip roads (Sites 15, 29 and J8-9)

January 2005

Mott MacDonald This report summarises available ground investigation information relevant to several defects identified during Principal Inspections around J8/9. This report does not contain any factual information.

20433 099

M4 Motorway - Class 1 Earthwork Defects - Preliminary Sources Study Report, Volume 1 J5 to 10

October 2003

Mott MacDonald This PSSR covers nine individual sites where defects are recorded between J5 and J10. The report includes exploratory hole records from HAGDMS Ref: 18152.

20563 103


2005


20960 104

M4 NRTS Phase 6 Junctions 10 to 12 - Geotechnical Issues

April 2006

Mouchel Parkman This report covers a summary of ground conditions and assessment of slope stability relating to Phase 6 upgrades of the Network Management Information Systems between 10 and J12. This report does not contain any factual information.

26738 153 M4 Junction 10 WB Off-Slip MP56/7 (EW47609) Embankment Repair - Preliminary Sources Study Report

January 2012

Mouchel This PSSR covers an earthwork defect identified during a survey at J10 of the M4.

26747 154 M4 Westbound, Junction 8/9 - 10 EW 329 - Cutting Remedial Scheme - Preliminary Sources Study Report

April 2011 Mouchel This report covers remedial works to a cutting located east of J10. The report contains exploratory hole logs from HAGDMS Ref: 18152.

Section 4, Winnersh to Theale, Junction 10 to Junction 12 (Scheme Chainage 46150 to 62900)


HA GDMS

report

number.

HHJV

Unique

report

reference

number


1506 005

M4 Widening Junctions 8(9) to 12 - Junctions 8(9) to 10, Technical Appraisal Report

September 1994


1512 007

M4 Widening Junctions 8(9) to 10 - Geotechnical Interpretative Report

November 1994

Acer Consultants This report describes and interprets the results of ground investigation between J8/9 and J10 for a Widening Within Land scheme. This report does not contain any factual information.

17780 047

M4 Principal and Earthworks Inspection - Geotechnical Interpretative and Design Report

March 2003

Mott MacDonald This report includes desk study information, interpretation of ground investigation information and design of remediation for a slope defect between MP67/1 and MP67/0 (J11-J12).

20563 103


2005


20399 097

M4 Motorway - Class 1 Earthwork Defects - Preliminary Sources Study Report, Volume 2 J10-12

October 2003

Mott MacDonald This PSSR covers eight individual sites of earthwork defects between J10 and J12.

20119 079 M4 Network Management Information System, Cutbush Transmission Station (MP62/9) - Preliminary Sources Study and Geotechnical Report

March 2005

Mouchel Parkman This PSSR covers a new transmission station at MP62/9. The report contains exploratory hole logs from the from the Le Grand Adsco (1967a) ground investigation (HHJV report ref: 161) and HAGDMS Ref: 18152. The report also contains additional exploratory hole records.

16774 039 M4 Junction 12 - Report on a Ground Investigation

June 2001 Norwest Holst Soil Engineering

This report contains the findings of a ground investigation at J12 on the M4. The ground investigation comprised eight cable percussive boreholes. The logs and the laboratory test results are included in the report.

18860 062

M4 Improvements between Junctions 8(9) and 12 - Geotechnical Desk Top Study

January 1990


19429 072 M4 Class 1 Earthworks Defects Junction 12 WB Off Slip - Preliminary Sources Study Report

August 2005

Mott MacDonald This PSSR includes information relevant to an earthwork defect at J12 of the M4 and contains the exploratory hole records for HAGDMS Ref: 16774 and HAGDMS Ref: 18152.

20153 087 M4 Motorway -Class 1 Earthwork Defects, Sites M, N, P, Q, R - Geotechnical Report

October 2004

Mott MacDonald This report includes interpretation of ground investigation for earthwork defects identified during Principal Inspections between J10 and J11. This report does not contain any factual information.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


20159 088 M4 Motorway -Class 1 Earthwork Defects, Junction 12 Off-slip Westbound - Geotechnical Report

May 2006 Mott MacDonald This report includes interpretation of ground investigation information relating to an earthwork defect at J12 of the M4. This report does not contain any factual information.

20182 091

M4 Motorway - Class 1 Earthworks Defects - Site 80 Geotechnical Report

December 2004

Mott MacDonald This report includes interpretation of ground investigation information relating to an earthwork defect identified during a Principal Inspection at J10. This report does not contain any factual information.

20387 096 M4 Motorway - Embankment at Westbound On-Slip at J10 – Preliminary Sources Study Report

August 2004

Mott MacDonald This PSSR covers information relevant to a defect at J10 of the M4.

20476 100 Area 3 - M4 Motorway, Class 1 Earthwork Defects - Preliminary Sources Study Report and Annex A

July 2007 Mott MacDonald This report covers one earthwork defect relevant to this scheme at MP 67.0 to MP 69.0 eastbound. The report contains exploratory hole records from the Le Grand Adsco (1967a) ground investigation (HHJV report ref: 161) and HAGDMS Ref: 18152.

20561 102 M4 NMIS Phase 6 Junctions 10 to 12 - Geotechnical Report

September 2006

Mouchel Parkman This report contains the findings of two phases of ground investigation (March 2006 and May 2006) for Phase 6 of Network Management Information System upgrade. The report includes laboratory test results.

20960 104

M4 NRTS Phase 6 Junctions 10 to 12 - Geotechnical Issues

April 2006

Mouchel Parkman This report covers a summary of ground conditions and assessment of slope stability relating to Phase 6 upgrades of the Network Management Information Systems between 10 and J12. This report does not contain any factual information.

21989 128 M4/A33 Junction 11 Improvements - Ground Investigation

June 2002 Soil Mechanics This report contains the findings of a ground investigation for 10 cable percussive boreholes, 27 window samples and four trial pits, including laboratory test results at J11.

21990 129 M4 Junction 11 - Integrative Transport Movements - Geotechnical Desk Study

December 2003

Peter Brett Associates

This PSSR covers a scheme proposed to improve J11 and contains exploratory holes from a number of ground investigations. The relevant exploratory holes are those from HAGDMS Ref: 18152.


HA GDMS

report

number.

HHJV

Unique

report

reference

number


21991 130 M4 Junction 11 - Integrated Transport Improvements - Geotechnical Interpretative Report

December 2003

Peter Brett Associates

This report contains interpretation of ground investigation information relating to a scheme to improve J11 of the M4. This report does not contain any factual information.

26036 146 M4 J11-12 W/B MP 72/1A+58 to 72/1A+90 (EW 361) Embankment Repair - M4 J11-12 W/B MP 72/1A+58 to 72/1A+90 (EW 361) Embankment Repair Preliminary Sources Study Report

May 2012 Enterprise Mouchel

This PSSR covers the study for an embankment repair between J11 and J12. The report contains the exploratory hole records from the Le Grand Adsco (1967a) ground investigation (HHJV report ref: 161).

26839 156 M4 J11-12 W/B MP 72/1A+58 to 72/1A+90 (EW 361) Embankment Repair - M4 J11-12 W/B MP 72/1A+58 to 72/1A+90 (EW 361) Embankment Repair: Combined Ground Investigation Report and Geotechnical Design Report

June 2012 Enterprise Mouchel

This report includes interpretation of ground investigation information and design proposals for an earthwork defect between J11 and J12. The ground investigation records contained within this report are for a study between J13 and J14, but have been attached to the wrong report.

Table 1.3: Summary of relevant previous ground investigations undertaken within the study area not available on HA GDMS

HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor

Details of investigation2

027 3 London to South Wales Motorway - Winnersh to Holyport Section

1969 Fitzpatrick A total of 6 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU87SW17 SU87SW16 SU87SW18 SU87SW20 SU87SW19 SU87NE2 During further research it was discovered these boreholes form part of HA GDMS report 4181.

051 3,4 M4 Widening 1993 Soil Mechanics A total of 161 no. exploratory holes comprising cable percussive boreholes, trial pits and


HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor


Junctions 8 (9) to 12 R.W.S

Limited trial trenches were sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU66NE105 SU66NE106 SU66NE107 SU66NE108 SU66NE111 SU66NE112 SU66NE113 SU66NE115 SU66NE116 SU66NE117 SU66NE119 SU66NE99 SU67SE102 SU67SE103 SU67SE104 SU67SE105 SU67SE106 SU67SE107 SU67SE108 SU67SE109 SU67SE110 SU67SE111 SU67SE114 SU67SE115 SU67SE118 SU67SE119 SU67SE120 SU67SE121 SU76NE39 SU76NE40 SU76NE41 SU76NE42 SU76NE43 SU76NE44 SU76NE45 SU76NE46 SU76NE47 SU76NE48 SU76NE49 SU76NE50 SU76NE51 SU76NE52 SU76NE53 SU76NW100 SU76NW102 SU76NW103 SU76NW104 SU76NW105 SU76NW106 SU76NW108 SU76NW109 SU76NW111 SU76NW112 SU76NW116 SU76NW120 SU76NW121 SU76NW122 SU76NW83 SU76NW85 SU76NW86 SU76NW87 SU76NW88 SU76NW89 SU76NW90 SU76NW93 SU76NW94 SU76NW95 SU76NW96 SU76NW98 SU77SE100 SU77SE101 SU77SE102 SU77SE103 SU77SE104 SU77SE105 SU77SE106 SU77SE107 SU77SE108 SU77SE109 SU77SE111 SU77SE113 SU77SE114 SU77SE115 SU77SE80 SU77SE81 SU77SE83 SU77SE84 SU77SE85 SU77SE86 SU77SE89 SU77SE90 SU77SE91 SU77SE92 SU77SE93 SU77SE94 SU77SE95 SU77SE96 SU77SE97 SU77SE98 SU77SE99 SU87NE100 SU87NE101 SU87NE54 SU87NE56 SU87NE64


HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor


SU87NE67 SU87NE68 SU87NE71 SU87NE72 SU87NE73 SU87NE74 SU87NE76 SU87NE77 SU87NE78 SU87NE79 SU87NE82 SU87NE83 SU87NE84 SU87NE85 SU87NE86 SU87NE88 SU87NE91 SU87NE95 SU87NE96 SU87NE97 SU87NE98 SU87NE99 SU87SE5 SU87SW100 SU87SW101 SU87SW34 SU87SW35 SU87SW37 SU87SW40 SU87SW41 SU87SW43 SU87SW44 SU87SW45 SU87SW49 SU87SW51 SU87SW52 SU87SW53 SU87SW55 SU87SW56 SU87SW57 SU87SW61 SU87SW62 SU87SW65 SU87SW67 SU87SW68 SU87SW74 SU87SW76 SU87SW82 SU87SW86 SU87SW87 SU87SW88 SU87SW90 SU87SW95 SU87SW96 SU87SW98 SU87SW99 During further research it was discovered these boreholes are available as part of HA GDMS report 18152.

159

1 MOT Chiswick – Langley Road

1959

Unknown A total of 25 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: TQ07NE261 TQ07NE262 TQ07NE263 TQ07NE264 TQ07NE265 TQ07NE266 TQ07NE267 TQ07NE268 TQ07NE269 TQ07NE270 TQ07NE271 TQ07NW289 TQ07NW290 TQ07NW291 TQ07NW292 TQ07NW293 TQ07NW294 TQ07NW295 TQ07NW296 TQ07NW297 TQ07NW298 TQ07NW299 TQ07NW300 TQ07NW301 TQ07NW302

160 2 Slough-Maidenhead By-Pass Contract No.2 (M4)

January 1960

Unknown A total of 16 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU97NE69 SU97NE116 SU97NE117 SU97NE118 SU97NE70 SU97NE133


HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor


SU97NE134 SU97NE73 SU97NE71 SU97NE72 SU97NE131 SU97NE137 SU97NE151 SU97NE152 SU97NE128 SU97NE129 SU97NE1 SU97NE25 SU97NE130

161 3,4 London to South Wales Motorway - Theale to Winnersh Section

January 1967

Le Grand Adsco A total of 61 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU66NE1 SU66NE10 SU66NE2 SU66NE3 SU67SE1 SU67SE12 SU67SE13 SU67SE15 SU67SE16 SU67SE2 SU67SE3 SU67SE5 SU67SE6 SU67SE7 SU67SE8 SU67SE9 SU67SW36 SU67SW37 SU67SW38 SU67SW39 SU76NE10 SU76NE11 SU76NE12 SU76NE13 SU76NE8 SU76NE9 SU76NW10 SU76NW11 SU76NW12 SU76NW13 SU76NW14 SU76NW2 SU76NW7 SU76NW8 SU77SE1 SU77SE10 SU77SE11 SU77SE12 SU77SE13 SU77SE14 SU77SE16 SU77SE18 SU77SE19 SU77SE20 SU77SE22 SU77SE23 SU77SE24 SU77SE25 SU77SE26 SU77SE27 SU77SE3 SU77SE30 SU77SE31 SU77SE32 SU77SE33 SU77SE5 SU77SE6 SU77SE7 SU77SE8 SU77SE9 SU87SW15

162 3 London to South Wales Motorway Holyport Section

January 1967

Le Grand Adsco A total of 8 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU87NE24 SU87NE25 SU87NE26 SU87NE27 SU87NE28 SU87NE29 SU87NE31 SU87NE30


HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor


163 1 M25 Motorway – Poyle to M4

1979 Unknown A total of 15 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: TQ07NW387 TQ07NW386 TQ07NW388 TQ07NW356 TQ07NW340 TQ07NW328 TQ07NW329 TQ07NW327 TQ07NW361 TQ07NW360 TQ07NW359 During further research it was discovered these boreholes are available as part of HA GDMS report 19446.

164 1 M4 Motorway Heathrow Spur to M25 Interchange

January 1983

Unknown A total of 8 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: TQ07NE312 TQ07NE313 TQ07NE314 TQ07NE315 TQ07NE316 TQ07NE317 TQ07NE318 TQ07NE319

165 2 Maidenhead Flood Study

January 1987

Unknown A total of 1 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU97NW128

166

1 Heathrow Access Road

1989

Soil Mechanics A total of 3 no. cable percussive boreholes and 1 no. trial pit sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: TQ07NE320 TQ07NE321 TQ07NE329 TQ07NE330 TQ07NE327

167 1 Heathrow Surface Access Studies

1991

Norwest Holst Soil Engineering

A total of 1 no. cable percussive boreholes and 15 no. trial pits sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: TQ07NE208 TQ07NE209 TQ07NE210 TQ07NE212 TQ07NE225 TQ07NE226 TQ07NE227 TQ07NE228 TQ07NE229 TQ07NE230 TQ07NE231 TQ07NE232 TQ07NE241 TQ17NW154 TQ17NW155 TQ17NW156 TQ07NE320 TQ07NE203 TQ07NE204 TQ07NE205


HHJV Unique

report

reference

number

Applicable to

M4MM

Scheme

Sections1

Ground

investigation

title

Date Ground

investigation

contractor


168

1,2 M25 VMS Gantries Phase 2 Ground Investigation

January 1991

Fugro – McCelland Ltd.

A total of 4 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU97NE350 TQ07NE381 TQ07NW493 TQ07NW494

169

4 M4 Junction 11 to 12

January 2001

Norwest Holst Soil Engineering Ltd.

A total of 7 no. cable percussive boreholes sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU76NW187 SU76NW189 SU76NW190 SU76NW191 SU76NW192 SU76NW193 SU76NW194

170 3 Area 3 Class 1 Earthworks Defects

January 2005

Unknown A total of 6 no. window samples and 4 no. trial pits sunk as part of this investigation are relevant to our scheme. The relevant exploratory holes are as follows: SU87NE180 SU87NE181 SU87NE182 SU87NE183 SU87NE184 SU87NE185 SU87NE186 SU87NE187 SU87NE188 SU87NE189

171 Construction of Pulverising Plant - Slough

1967 Ground Explorations

Subsoil information record SU97NE119 SU97NE120 SU97NE121 SU97NE122

172 Slough Southern Intercepting Sewer

1943 Unknown Record of Shaft or Bore for Minerals: SU97NE52

173 BGS Records of Water wells (various)

Various Various

Records of water wells drilled for abstraction or control of gravel extractions: SU97NE315 SU97NE142 SU97NE145 SU97NE146 SU97NE313A SU97NE313B SU97NE313C SU97NE313D SU97NE313E SU97NE313F

174 Slough Sewage Treatment Works - Manor Farm

1986 Unknown

Thameswater GI for sewage sludge beds and gravel extraction: SU97NE117 SU97NE118 SU97NE126 SU97NE157 SU97NE156 SU97NE158 SU97NE160 SU97NE162 SU97NE149 SU97NW117 SU97NW118

Documents

GEOTECHNICAL STATEMENT OF INTENT - Planning Inspectorate · reviewed as part of the TAR and PSSR in order to determine the likelihood and extent of any mining or contamination beneath