Department of Environmental Services
SPECIFICATION AND NOTES FOR GUIDANCE
FOR HIGHWAY WORKS BY DEVELOPERS UNDER AGREEMENT
Eigth Edition - May 2003
Contents
Page
NOTES FOR GUIDANCE AND PROCEDURE 3
SPECIFICATION 21
APPENDIX A Contact Numbers and Map showing Area Numbers 35
APPENDIX B Application for entering into a Section 38 Agreement (Form 1A) 39
APPENDIX C List of Applicable British Standards 41
APPENDIX D Design and Specification Drawings 43
Further copies of this document are available from the Administration & Information Services Section, Department of Environmental Services, County Hall, Trowbridge BA14 8JD Tel: 01225 713300 NOTES FOR GUIDANCE AND PROCEDURE
Contents
1 GENERAL NOTES 5
1.1 GENERAL POLICY 5
1.2 INDUSTRIAL ESTATE ROADS 5
1.3 ADVANCE PAYMENTS CODE 5
1.4 SECTION 38 AGREEMENT 5
1.5 CONSENTS 5
1.6 INITIAL CONSULTATION 6
2 PROCEDURE FOR ENTERING INTO A SECTION 38 AGREEMENT 7
2.1 COMPLIANCE WITH THE SPECIFICATION 7
2.2 DRAWING REQUIREMENTS 7
2.3 SOILS TESTING 8 2.3.1 General 8 2.3.2 Road Design 8 2.3.3 Soils Testing Specification 9
2.4 GEOTECHNICAL DESIGN 9 2.4.1 Earthworks 9 2.4.2 Soakaways 9 2.4.3 Reinforced Soil Structures and Earthworks 9
2.5 STREET LIGHTING 9
2.6 STRUCTURES 10 2.6.1 Site Investigation 10 2.6.2 Design 10
2.7 FINAL DRAWINGS 10
3 NOTES ON DESIGN AND PREPARATION OF DRAWINGS 11
3.1 ROADWORKS DESIGN 11 3.1.1 Footway Edging 11 3.1.2 Pedestrian Crossing Points 11 3.1.3 Boundary Hedges 11 3.1.4 Widening of Existing Carriageway 11
3.2 SURFACE WATER DRAINAGE 11 3.2.1 General 11 3.2.2 Outfall and Easements 12
3.3 STREET LIGHTING 13
3.4 STRUCTURES 13
3.5 TRAFFIC SIGNS AND ROAD MARKINGS 13
3.6 PUBLIC RIGHTS OF WAY 14
-3 - 3.7 LANDSCAPING 14 3.7.1 Design 14 3.7.2 Post-adoption Maintenance Responsibilities 14 3.7.3 Plant-material selection 14 3.7.4 Restrictions on planting 14 3.7.5 Code of Practice for Trees 15 3.7.6 Tree Surgery 15 3.7.7 Recommended Trees and Shrubs 15 3.7.8 Specification 15
3.8 ENVIRONMENTAL BARRIERS 16
4 APPROVAL OF DRAWINGS AND COMPLETION OF AGREEMENT 17
4.1 APPROVAL OF DRAWINGS 17
4.2 BOND 17
4.3 SUPERVISION CHARGE 17
4.4 ADVANCE PAYMENTS CODE 17
4.5 AMENDMENTS TO DRAWINGS 17
5 CONSTRUCTION AND SUPERVISION OF WORKS 18
5.1 NOTICE OF COMMENCEMENT OF WORKS 18
5.2 WORKS WITHIN EXISTING HIGHWAY 18
5.3 STATUTORY UNDERTAKERS SERVICES 18
5.4 INSPECTION AND SUPERVISION OF WORKS 19
5.5 PART 1 CERTIFICATE 19
5.6 OCCUPATION OF BUILDINGS 19
5.7 MAINTENANCE OF WORKS 19
5.8 COMPLETION OF WORKS 19
5.9 'AS CONSTRUCTED' DRAWINGS 20
5.10 FORMAL ADOPTION 20
TABLE 1 - ROAD TYPES 20
- 4 - 1 GENERAL NOTES
1.1 General Policy
As a general policy, the County Council require all new residential estate roads serving more than two dwellings on greenfield sites and five dwellings on permitted infill sites to be constructed in accordance with the County Council's Specification and on satisfactory completion to be adopted as publicly maintainable highways.
1.2 Industrial Estate Roads
Industrial estate roads are not generally accepted for adoption by the County Council unless they serve premises to which the public require regular access e.g. retail development or on mixed developments.
If, however, the developer is unaware of the type of development at the time of construction and feels it desirable for the works to be designed and constructed to adoption standards, the usual Section 38 procedures can be followed, except, of course, for final adoption, upon payment of the appropriate administration and supervision fee.
1.3 Advance Payments Code
Upon notification by a District Council of the granting of consent under Building Regulations, the County Council may, within six weeks of that consent, serve a notice under the Advance Payments Code (Highways Act, 1980 - Sections 219 to 225) requiring the deposit of money to cover the estimated cost of constructing the roads and footpaths on the development.
It is an offence to commence building works fronting the new street(s) without having first paid the sum demanded under the Advance Payments Code, or having entered an agreement under Section 38 of the Highways Act, 1980 to secure completion of the works.
1.4 Section 38 Agreement
When a developer wishes to secure adoption of highway works on a new development, they should enter into an Agreement with the County Council under Section 38 of the Highways Act, 1980. This ensures that the works are constructed to the County Council's Specification; is supported by a Bond to cover the estimated cost of the works; and guarantees eventual adoption provided the terms of the Agreement are satisfied.
1.5 Consents
Before a Section 38 Agreement can be completed, the following consents must be obtained (where applicable): -
i) Planning permission from the appropriate Planning Authority.
ii) Discharge Consent for any highway drainage outfall from the Water Authority and/or The Environment Agency.
iii) Orders made and confirmed providing for the diversion or closure of Public Rights of Way, usually from the District Council.
iv) Licences for structures over existing public highway.
v) Grants of Easement for Highway Drains from Landowners which should be sought at an early stage.
- 5 - 1.6 Initial Consultation
Developers are strongly advised to consult with the Department of Environmental Services at the earliest stage as to the details of layout, drainage and construction. In order to establish initial contact, either write to the Director of Environmental Services or telephone the Development Control Group on 01225 713443.
Developers or their legal advisors may also wish to have preliminary consultations with the Legal Section of the County Secretary and Solicitor, 01225 713073 as to the form of Section 38 Agreement, approved bondsmen and the terms of any easements required.
- 6 - 2 PROCEDURE FOR ENTERING INTO A SECTION 38 AGREEMENT
2.1 Compliance with the Specification
The developer is required to provide design drawings and other information relating to the proposed highway works that should comply with the attached Specification.
2.2 Drawing Requirements
A formal written application for entering into a Section 38 Agreement should be made to the Director of Environmental Services accompanied by two copies of each of the following drawings/documents:-
Scale
(I) Site Plan showing location 1/1250 or 1/2500
(ii) Layout of roads, footpaths and drainage showing full 1/500 or 1/200 details including dimensions, contours, driveway gradients, gullies, watercourses, buildings, visibility splays, setting-out information and street lighting
(iii) Longitudinal sections of the carriageway and Horiz. 1/500 or 1/200 independent footpaths showing existing ground levels Vert. 1/50 or 1/20 and proposed centre line and channel levels
(iv) Longitudinal sections of any highway drainage Horiz. 1/500 showing existing and proposed ground levels, invert Vert. 1/50 levels, gradients, pipe classifications and bedding details
(v) Cross sections at such intervals considered necessary 1/50 or 1/100 to fully interpret the scheme
(vi) Construction details showing construction depths, 1/10 or 1/20 proposed materials and any other relevant details
(vii) Details of any structures, including design calculations, As appropriate which appertain to the highway works
(viii) Drainage calculations for any highway drainage and, if appropriate, pipe strength structural calculations.
(ix) Soils investigation report (if available)
(x) Details of any rights of way affected by the proposed 1/1250 or 1/2500 development, including any proposals for closure or diversion
Unless otherwise agreed, all levels shall be to Ordnance Datum.
In addition to the above drawing requirements, 2 additional copies of the 1/500 Layout Plan should be provided in order that soils testing may be arranged. (See 2.3 overleaf).
- 7 - Finally, a further copy of the 1/500 layout plan should be provided indicating:-
i) The land in the ownership of the developer edged red.
ii) The area being offered for adoption coloured pink.
iii) Any areas of existing highway affected coloured yellow.
iv) Highway drainage to be adopted coloured dark blue.
v) Any drainage easements coloured pale blue.
vi) Any phasing requirements.
2.3 Soils Testing
2.3.1 General
At the same time as making the above submission and, if not previously arranged by themselves, the developer or their agents should confirm their agreement to paying all costs in respect of soils testing by a Wiltshire County Council’s approved laboratory. This is necessary primarily in order to establish C.B.R. values for the sub-soil, which will ascertain the required construction depth. Any special requirements due to abnormal ground conditions will also be established. The developer will be informed of the required sub-base thickness (and capping layer requirement if appropriate) and will receive a copy of the laboratory report.
If C.B.R. values are not available for the proposed design, a value of less than 2% must be assumed.
2.3.2 Road Design
The designer shall assess the CBR of the subgrade for:
i) Suitability for construction
ii) Construction CBR value
iii) Equilibrium CBR value
The construction CBR shall be assessed by either in-situ testing at the time of construction or in the case of embankments by laboratory testing of samples recompacted at moisture contents and dry densities which reflect the likely conditions on site.
The assessment of the long-term CBR at equilibrium moisture content for cohesive soils may be found by using LR 1132 “The Structural Design of Bituminous Roads” by W D Powell, J F Potter, H C Mayhew, and M E Nunn TRRL – HMSO.
The design assumptions should be stated and soil classification tests on the subgrade material should be carried out. For cohesionless soils the long-term CBR and the construction CBR can be assumed to be the same with the exception of silty fine sand which can be moisture sensitive.
If conditions during construction are likely to result in a lower CBR value than in the long-term then the construction CBR should be used for design.
Note: No material within 450mm of the designed final road surface shall be frost susceptible, whether used as pavement sub-base, capping, fill material in embankments or in-situ material in cuttings.
- 8 - 2.3.3 Soils Testing Specification
Soils shall be tested in accordance with BS 1377:Part 1 to Part 9:1990 “Methods of Test for Soils for Civil Engineering Purposes”.
2.4 Geotechnical Design
The following shall be designed and calculations submitted for approval:
2.4.1 Earthworks
The stability of any earthworks greater than 1m in height which may affect the highway if it were to fail shall be assessed for both long and short-term stability. Calculations showing method of analysis, measured and assumed parameters and factors of safety shall be submitted. A minimum factor of safety against shear failure of 1.3 is required.
2.4.2 Soakaways
Where soakaway drainage is to be considered, testing and design shall be carried out in accordance with BRE Digest 365 “Soakaway Design” September 1991.
2.4.3 Reinforced Soil Structures and Earthworks
Reinforced soils structures and earthworks shall be designed in accordance with:
i) BS 8006:1995 “Code of Practice for Strengthened / Reinforced Soils and other Fills”.
ii) Design Manual for Roads and Bridges, Volume 4, Geotechnics and Drainage, Part 4 HA 68/94
iii) “Design Methods for the Reinforcement of Highway Slopes by Reinforced Soil and Soil Nailing Techniques” 1994 HMSO
2.5 Street Lighting
Developers will be required to provide road lighting to BS 5489:1992 on the majority of sites, the lighting scheme to be designed either: -
i) by Wiltshire County Council's Engineering Consultant, at cost.
ii) by the developer's own designer, with the appropriate plans and supporting design calculations being submitted for checking by Wiltshire County Council’s Consultant.
Two copies of the engineering layout plan indicating the street lighting scheme should be forwarded under (ii) that shows:
a) Location of all drainage
b) Position of individual accesses
c) Window and door arrangements for all house types.
The Development Control Engineer will return one copy of the plan showing the column identification numbers that should be added to the final drawings.
- 9 - 2.6 Structures
2.6.1 Site Investigation
A site investigation shall be undertaken for every site in accordance with BS 5930:1981. A suitably qualified Geotechnical Engineer and/or Engineering Geologist shall be responsible for the investigation. The extent of the investigation will depend on the magnitude and nature of the proposed works and the nature of the site, and will include a desk study unless otherwise agreed with Wiltshire County Council.
One week’s notice shall be given to Wiltshire County Council of any site work for the investigation to enable a WCC engineer to be present. A Desk Study Report, Factual Report and Interpretive Report shall be submitted to WCC at an early stage.
2.6.2 Design
Technical Approval is required for any structures that appertain to the highway, including retaining structures over 1.37m. high and within 3.66m of the highway, will be checked and approved by the Structures Division. This approval must be granted prior to the Section 38 Agreement being completed. (See also Section 3.4).
All structures shall be designed to BS 5400. Calculations and drawings shall be submitted to Wiltshire County Council for approval.
Retaining walls supporting the highway shall be mass or reinforced concrete Structure type and method of design must be agreed before any detailed design is carried out.
Embankment or cutting slopes shall not exceed gradients specified in the site investigation interpretative report, and shall have a 1.0m level berm at the top of the slope. Any fencing shall be sited at the back of this berm. A 1.0m level berm shall also be provided from the back of the kerb or footway edging where applicable.
2.7 Final Drawings
Once the drawings and calculations have been approved, a final submission should be made in order that an Agreement may be prepared. The following number of drawings should be provided for each phase of the development: -
i) Layout Plan 11 copies
ii) All other relevant drawings 4 copies.
iii) Plan showing drainage easement 4 copies (if applicable).
In addition, a completed Form 1A (a copy of which is available in Appendix B) giving essential legal information should be submitted to avoid undue delay. These will then be forwarded to the County Secretary and Solicitor.
- 10 - 3 NOTES ON DESIGN AND PREPARATION OF DRAWINGS
3.1 Roadworks Design
Refer to Table 1 for road design parameters and to Drawings HED/01 to HED/16 for typical design requirements.
3.1.1 Footway Edging
Footway edging is required in all cases and especially against any adjoining walls to give a rolling edge, except where block paving is used when a full detail must be provided.
3.1.2 Pedestrian Crossing Points
Pedestrian crossing points shall be included as shown on Drawing No. HED/11. Tactile paving shall be incorporated, generally on all major through routes, where required by WCC and all in accordance with the details shown in “Guidance on the use of Tactile Paving Surfaces” (latest edition 1998) produced by the Department of the Environment, Transport and the Regions.
Gullies shall be located clear of pedestrian crossing points and private drive access points.
3.1.3 Boundary Hedges
Care must be taken to ensure that where a site’s boundary hedge abuts the highway it is included within adjoining plots and that responsibility for it is passed to the new owners. This is to avoid the anomaly where fences are erected, either by the developer or subsequently the owner, on the plot site effectively creating a ‘no man’s land’. The highway authority can then be faced with establishing responsibility for maintenance where growth overhangs the highway, which can be time consuming.
3.1.4 Widening of Existing Carriageway
Where widening of the highway is necessary as part of a development proposal, the crossfall or camber of the existing highway shall be maintained and extended across the new works to the new channel line(s). In certain circumstances, where level difficulties arise, regulating of the existing highway will be required to achieve a satisfactory profile.
3.2 Surface Water Drainage
3.2.1 General
An efficient system should be provided for the disposal of surface water from the carriageway, adjacent footways and verges.
The surface water from the highway will generally be disposed of by one of the following methods: -
i) Gullies connecting directly to either existing public sewers or proposed sewers which are or will be the subject of a Section 104 Agreement with the Water Authority. In this case, the Highway Authority will only adopt the gullies and their connections.
- 11 - ii) A surface water drainage system is provided for the acceptance of water from the proposed highway only. The Highway Authority will adopt this system under the Section 38 Agreement, which should outfall into a public sewer, watercourse or highway drain.
iii) Gullies connecting directly to an existing highway drain, the connections being adopted by the Highway Authority.
iv) Where appropriate, the use of more ‘environmentally friendly’ methods of surface water disposal generally complying with Best Management Practices promoted by the Environment Agency. Options available include the provision of grass swales, detention ponds, retention ponds and other porous surfaces. Developers are advised to discuss the suitability and application of these methods at the earliest stage. The Highway Authority will not normally adopt such devices, but in appropriate circumstances the Authority may accept future maintenance responsibilities upon payment of an appropriate commuted sum.
It must not be assumed that the highway authority will automatically give permission to make a connection into an existing highway drain.
3.2.2 Outfall and Easements
Where surface water is to discharge into a river or other watercourse, the developer must satisfy the County Council of the right to discharge at that location, including where necessary consent from the Water Authority under the Land Drainage Act 1976 and the Control of Pollution Act 1974, and/or The Environment Agency under the Water Act 1989.
If a highway drain that is to be adopted under a Section 38 Agreement crosses land not being dedicated under the Agreement, all drainage easement rights should be obtained, including the right of the County Council to enter the land and maintain the sewer at all times after adoption. Such easements are normally 6 metres wide centred on the line of the drain.
Design Considerations
i) Gully spacing Refer to Drawing HED/15
ii) Maximum gully connection length 20m.
iii) Double gullies at low points with individual connections.
iv) Minimum pipe diameter 150mm.
v) Maximum manhole spacing 100m.
vi) Backdrop manholes - to be utilised where difference in invert exceeds 1.0m.
vii) Pipe Capacities - Tables for the Hydraulic Design of Pipes & Sewers: Fourth Edition: 1983 published by the Hydraulics Research Station.
viii) Design Method - Modified Rational Method (Volume 4 of the Wallingford Procedure).
- 12 - ix) Design Parameters: -
Storm Frequency 1 in 2 years
Time of Entry 4 minutes
Minimum Velocity at Full Bore 0.75m/sec.
Permeability Factor 1.0 over all carriageways, footways, verges up to 3.0m in width and cutting banks with a slope of greater than 1 in 5.
Roughness Value 0.6mm
Developers should be aware that, under Section 163 of the Highways Act, 1980 no water from private premises should be allowed to flow onto or over the highway and design measures should be taken to prevent this.
3.3 Street Lighting
A street lighting scheme will be required on the majority of sites. (See Section 2.5).
Your attention is drawn to the importance of informing the Electricity Board of your requirements at the earliest opportunity in order that servicing may be arranged.
Any approved street layout alteration made after the preparation of the lighting layout is to be referred back to the Development Control Group, if necessary, with modifications to the column positions; this will be the developer’s responsibility.
Under Clause 9 of the Section 38 Agreement, street lighting columns should be erected prior to the occupation of houses within their vicinity.
Street lighting column positions should be shown on Sales Office plans so that prospective purchasers are aware of the facts. The County Council will advise any house purchaser who wishes to have lighting columns moved for their own convenience that this cannot be considered unless a written request is made by the developer, who will then be advised of the consequences. Alterations to the position of a lighting column could affect the positioning of other columns in order to preserve lighting continuity. It is, therefore, in the developer’s interest to ensure that prospective purchasers are aware of the positions of all columns prior to exchange of contracts.
3.4 Structures
The developer is advised to consult with the Development Control Group at the earliest opportunity to discuss the design of any structures to be adopted by the County Council. (See also Section 2.6).
3.5 Traffic Signs and Road Markings
The developer shall provide details of any traffic signs and/or road markings required. The road-marking layout for a simple priority junction is shown in Drawing HE/11.
- 13 - 3.6 Public Rights of Way
Where a public right of way crosses the development site and will need to be stopped-up or diverted the developer must make an application to the District Council for the necessary Order to be made and confirmed.
The developer is reminded that during the course of construction, any public rights of way crossing the site must be kept open for public use and where a diversion Order is made the substitute path must be provided before the diverted length is closed.
If any temporary closures of Rights of Way are required to facilitate construction, it is important that these are sought well in advance of the commencement of the works that affect the Right of Way.
3.7 Landscaping
3.7.1 Design
The Developer should employ a qualified landscape architect to ensure that landscape proposals for the development are of an adequate standard and appropriate to the site. Further advice may be obtained from the Development Control Group.
3.7.2 Post-adoption Maintenance Responsibilities
It is County Council policy that areas of planting requested for amenity reasons by the District Council as a condition of planning permission and which will be within public areas should be maintained by the District Council.
Trees, shrubs and other vegetation should, wherever possible, be located in areas that will be privately maintained, i.e. in gardens within dwelling curtilages.
3.7.3 Plant-material selection
Sensitive modelling of earthworks and careful planting design can provide a landscape framework for the development. Native species appropriate to the soil and other site conditions should be used for this structure planting.
Planting in spaces within the development may have a more ornamental character but only long-lived robust plant species needing minimal maintenance should be used.
3.7.4 Restrictions on planting
No tree, shrub or other plant material with a mature height of more than 300mm may be planted in any visibility splay at road junctions, roundabouts or bends.
No tree species may be planted within 3m of a class "A" or class "B" road or within 2m of a class "C" or unclassified road.
No tree species may be planted in service strips within areas that will be adopted highway, nor within 3m of the route of major underground services or sewers.
No tree or shrub species may be planted where, at their mature size, they will obstruct street lights or road signs.
Small and isolated shrub beds or grass areas must not be created. Shrub beds less than 1m in width are most unlikely to be satisfactory and will not generally be adopted.
- 14 - 3.7.5 Code of Practice for Trees
The developer must comply with the recommendations of BS 5837:1991 and the National Joint Utilities Guidelines for the Planning, Installation and Maintenance of Utility Services in the Proximity to Trees (April 1995).
3.7.6 Tree Surgery
Where existing trees are to be retained, the Developer must ensure that they are safe and have a minimum vertical clearance of 6m over roads and 3m over footpaths and gardens. All surgery necessary to achieve these aims must be carried out by properly qualified and competent tree surgeons at the Developer's expense before adoption. Lopping and/or topping are not acceptable treatments. Where branches are removed this must be done carefully to avoid tearing of bark and the branch ridge and branch collar must be undamaged. Wound sealants may not be used.
Where a tree which was to be retained has been substantially damaged to the extent that it is not considered suitable for adoption by the County Council, the Developer will be responsible for its removal including grinding out the roots to 600mm below adjacent levels, removal of all arisings, backfilling with topsoil and replacement planting with whatever size of tree the appropriate District Council may require.
3.7.7 Recommended Trees and Shrubs
Schedules are included in 'Landscaping in Residential Developments' (see 3.7.8) to illustrate the range of species acceptable for use alongside new residential roads. These lists do not include all suitable species and should not be used as a planting prescription by themselves; they do not offer a way in which the Developer can avoid the need for professional landscape advice.
The ultimate mature height and form of a tree or shrub are extremely important in deciding on its suitability for planting in any position and must always be taken into account.
Plant material must be chosen on the basis of: -
i) Design requirements
ii) Soil type and other site considerations
iii) Maintenance requirements
Species that produce suckers and trees that produce shoots from the base and trunk should obviously not be used close to visibility splays.
3.7.8 Specification
Refer to the Wiltshire County Council publication entitled 'Landscaping in Residential Developments' available from the Department of Environmental Services.
- 15 - 3.8 Environmental Barriers
When environmental barriers are required on residential estate developments to mitigate the effect of noise from proposed roads the County Council will not accept liability for the maintenance of such barriers as part of the highway, unless such barriers have been specifically requested by the highway authority. Arrangements should be made between the developer and landowners or the District Council for the upkeep and maintenance of environmental barriers.
- 16 - 4 APPROVAL OF DRAWINGS AND COMPLETION OF AGREEMENT
4.1 Approval of Drawings
When all drawings and details have been approved, the Director of Environmental Services will issue his formal approval and signify that he has no objection to the works commencing, subject to compliance with certain conditions which are detailed within the letter of approval.
4.2 Bond
A Bond based on the Director of Environmental Services' estimate of the cost of the proposed works will be required. This should be arranged either with a Joint Stock Clearing Bank, an Insurance Company having Department of Trade and Industry approval to undertake surety business or the National House Building Council. Further details may be obtained from the Legal Section of the County Secretary and Solicitor's Department. Telephone 01225 713074.
As an alternative to a bond, the developer may wish to make a cash deposit equal to the estimated cost of the works which will be refunded, with interest accrued, on adoption of the works.
4.3 Supervision Charge
A charge will be made by the County Council in respect of administration and supervision of construction, other than testing of materials (including establishing CBR values) which will be charged separately (see Cl.105, p.24). The charge is 5.5% of the full estimated cost of the highway works plus 2% of the cost of any structures, and must be paid prior to completion of the Section 38 Agreement or the commencement of site works, whichever is the sooner.
4.4 Advance Payments Code
If a developer wishes to commence work on the erection of any building to which a notice served under the Advance Payments Code applies and a Section 38 Agreement has not been completed, then the appropriate sum demanded under the Code must be deposited with the County Council in accordance with Section 219 of the Highways Act 1980. After an Agreement and Bond have been completed provision is made in the Highways Act for the refund, at the appropriate time, of any sum so deposited.
NO BUILDING WORK FRONTING THE STREET(S) MAY BE COMMENCED UNTIL EITHER THE SECTION 38 AGREEMENT HAS BEEN SIGNED OR THE SUMS DEMANDED UNDER THE ADVANCE PAYMENTS CODE HAVE BEEN DEPOSITED WITH THE COUNTY COUNCIL.
4.5 Amendments to Drawings
The Director of Environmental Services should be informed immediately of any amendments made to the drawings of works covered by an agreement. Confirmation will then be given of their acceptance or otherwise and the revised drawings will be included under the terms of the Section 38 Agreement.
- 17 - 5 CONSTRUCTION AND SUPERVISION OF WORKS
5.1 Notice of Commencement of Works
At least two week’s notice in writing of the intention to commence highway works must be given to the Development Control Group, stating the date on which the works are due to commence. Any works carried out prior to drawing approval will be entirely at the risk of the developer. This notice is in addition to any notice that may be required in order to comply with the requirements of the New Roads and Street Works Act 1991(see 5.2 below).
The Development Control Group should also be contacted to arrange a pre-contract meeting so that information regarding site personnel, sub-contractors, materials suppliers, etc can be obtained.
5.2 Works within existing highway
The approved drawings and conditions of a Section 38 or Section 106 Agreement do not authorise interference with Statutory Undertakers' apparatus or works without their consent. Under the Agreement the works comprising any works within the existing highway will be deemed to be executed by the developers as if the works were executed for road purposes and were mentioned in Section 86, Part III of the New Roads and Street Works Act 1991.
Before executing any works in or under the existing highway the developer shall give not less than one month’s notice in writing to the Highway Authority and Statutory Undertakers stating the nature and place of the proposed works, and comply with Sections 54 and 55 of the New Roads and Street Works Act, 1991. The developer shall satisfy the Highway Authority’s and Undertaker's requirements as to works required by them and the costs involved and to the supervision thereof.
Where, apart from works required in connection with a road junction, it is necessary to lay drainage within and under a highway, it will be necessary for the County Council to issue a separate licence under Section 50 of the New Roads and Street Works Act 1991 before such works commence. For the avoidance of doubt, a consent issued under Section 50 should not necessarily be deemed to imply a consent to connect into an existing highway drain. The requirements of Section 67 in respect of supervisors and operatives must also be met.
Whilst executing any works within or under the highway the developer shall comply with the requirements of Section 65 of the New Roads and Street Works Act 1991 and ensure that all reasonable facilities are provided for the safe passage of vehicular and pedestrian traffic at all times, that the highway is kept free of mud and deposits, and that the works are properly signed, fenced, guarded and lit all in accordance with the "Traffic Signs Manual" Chapter 8. Traffic management statements will be required. Early contact should be made with the Area Co-ordinating Technician shown in Appendix A.
5.3 Statutory Undertakers Services
The developer must comply with the Statutory Undertakers' requirements as to the provision and location of those services under their control. Your attention is drawn to Drawing HED/16 showing the recommended disposition of services in footways.
All Undertakers' apparatus and services must be laid, completed and tested prior to laying the wearing course of the carriageway and footways, unless provision has been made for future services by the installation of approved ductwork.
- 18 - 5.4 Inspection and Supervision of Works
The construction of the works will be under the supervision of the Area Highway Manager in whose area the works are situated. The relevant telephone numbers are given in Appendix A.
The Director of Environmental Services or his representative shall have access to the site at all times for the purpose of inspection and supervision of the works.
During the progress of the works the developer or his contractor shall give at least 48 hours notice to the relevant Area Highway Manager of his intention to commence specific stages as defined in Specification Clause 113.
5.5 Part 1 Certificate
Once certain works as scheduled in the Section 38 Agreement have been satisfactorily completed (generally drainage and both carriageways and footpaths up to base course level), the Director of Environmental Services will issue a Part 1 Certificate and, if appropriate, a reduction in the bond liability will be made.
5.6 Occupation of Buildings
The developer's attention is drawn to Clause 9 of the Section 38 Agreement which does not allow dwellings to be occupied until a Part 1 Certificate has been issued and road lighting and street nameplates have been erected.
5.7 Maintenance of Works
The developer shall ensure that during the course of the works and during the maintenance period the following work is carried out: -
i) All carriageways, footways, footpaths and cycleways are swept.
ii) All gullies are emptied and cleansed.
iii) All grass verges are cut, trimmed and kept free of weeds.
iv) All areas of landscaping are maintained and kept free of weeds.
5.8 Completion of Works
Once all the works forming the subject of the Section 38 Agreement are complete, the developer shall notify the Director of Environmental Services who will then arrange the necessary inspections. Provided any required remedial works are satisfactorily completed, the Director of Environmental Services will then issue his Part 2 Certificate giving the date of commencement of the twelve month maintenance period.
- 19 - 5.9 'As Constructed' Drawings
The developer shall provide six copies of a 1/500 scale plan showing the works 'As Constructed' prior to formal adoption. The plan shall show all relevant details including gully positions, surface water drainage, light column positions and street names. Where highway drainage is to be adopted under the Section 38 Agreement, two copies of the 'As Constructed' Longitudinal Sections shall be provided.
The drawings shall be coloured as follows:
Carriageway Brown
Footway/Footpath/Hard Landscaping Grey
Service Strip/Visibility Splay/Verge Green
Highway Drainage Lined in Blue
Drainage Easement Coloured Pale Blue
Street Lighting Columns Red
The drawing(s) should also indicate, where appropriate, areas of Public Open Space; drainage outfalls into ditches other than those highway drains covered by Easement and the person(s) responsible for future maintenance; ownership and responsibility for future maintenance of hedges, boundaries and areas adjoining the public highway but not obviously included within house plots.
5.10 Formal Adoption
At the end of the twelve-month maintenance period, the Director of Environmental Services will arrange a final inspection. Once any necessary remedial works have been satisfactorily completed and the terms and conditions of the Section 38 Agreement have been complied with, the Director of Environmental Services will issue his Final Certificate and confirm formal adoption of the works as highways maintainable at the public expense.
- 20 - TABLE 1 – ROAD TYPES Table 1 – Road Types Road Type AR1 AR2 AR3 AR4 AR5 AR6 AR7
Maximum number of dwellings Up to Capacity Flows 400 (subject to second 300 100 (cul-de-sac) 25 (cul-de-sac) 12 6 access) 150 (loop) 50 (loop)
Frontage access Only if Traffic <300 vph Not Restricted at Restricted at Restricted at Restricted at Restricted at Permitted Junctions Junctions Junctions Junctions Junctions
Carriageway width 6⋅7m <750 Dwellings 6m 5.5m 5.5m 5.5m 6m including 6m including 7⋅3m >750 Dwellings 2m service strip 2m service strip
Horizontal Curve radius 90m Minimum 70m Minimum 10m minimum 10m minimum 10m minimum N/A N/A
Minimum vertical curve length 30m 30m 25m 25m 20m N/A N/A
Maximum forward visibility No Maximum 120m 120m 90m 66m N/A N/A - 21 Minimum forward visibility 90m 60m 60m § 45m § 33m N/A N/A
Minimum junction spacing 80m (same side) Not 30m (same side) 30m (same side) 30m (same side) N/A N/A 40m (opp.side) Applicable (crossroads permitted) (crossroads permitted) (crossroads permitted)
Junction 'x' distance φ 9m 4.5m 4.5m 2.4 <50 dwellings 2.4m 2.4m 2.4m or else 4.5m
'y'distance for side roads 90m N/A 60m § 45m § 33m N/A N/A
Maximum spacing between bends No Maximum 30m N/A N/A N/A N/A N/A
Minimum spacing between bends 25m Minimum 15m N/A N/A N/A N/A N/A
Gradient 8% Maximum 8% Maximum 8% Maximum 8% Maximum 8% Maximum 8% Maximum 8% Maximum 0⋅8% Minimum 1% Minimum 1% Minimum 1% Minimum 1% Minimum 1% Minimum 1% Minimum
Footways 2m Wide Both Sides 2m wide both sides 2m wide both sides 2m wide both sides Not required Not required Not required (relaxation possible)
Verges 3m Wide Both Sides 2m wide both sides Minimum 1m Not required 2m service strip 0.5m verges 0.5m verges (4m if no footway) Where provided 0.5m verge
Junction radii φ 10/15m 10/15m 6m 4.5/6m 4.5m N/A N/A
φ These requirements relate to the requirements of the junction between this road § Relaxations may be permitted where 20mph zone status is being pursued type and the higher category road. See criteria for side roads as appropriate. SPECIFICATION
The specification for workmanship and materials is the 'SPECIFICATION FOR HIGHWAY WORKS' - Sixth Edition 1986 issued by the Department of Transport and published by Her Majesty's Stationary Office.
The additions and amendments set out herein will apply insofar as if any of the following Notes for Guidance depart from the above Specification these Notes for Guidance shall be deemed to apply.
CONTENTS
SERIES 100 - PRELIMINARIES 25 CLAUSE 105 GOODS, MATERIALS, SAMPLING and testing 25 CLAUSE 112 SETTING OUT 25 CLAUSE 113 PROGRAMME of works 25
SERIES 200 - SITE CLEARANCE 26 CLAUSE 202 EXISTING TREES, STUMPS AND ROOTS 26
SERIES 300 - FENCING 26 CLAUSE 303 TEMPORARY FENCING 26 CLAUSE 306 PERMANENT FENCING 26 CLAUSE 308 GATES AND STILES 26
SERIES 400 - SAFETY FENCES, SAFETY BARRIERS & PEDESTRIAN GUARDRAILS 26 CLAUSE 401 PERFORMANCE CRITERIA FOR SAFETY FENCES & SAFETY BARRIERS 26 CLAUSE 412 PEDESTRIAN GUARDRAILS 26
SERIES 500 - DRAINAGE AND SERVICE DUCTS 27 CLAUSE 501 PIPES FOR DRAINAGE AND FOR SERVICE DUCTS 27 CLAUSE 502 EXCAVATIONS FOR PIPES AND CHAMBERS 27 CLAUSE 503 BEDDING, LAYING AND SURROUNDING OF PIPES 27 CLAUSE 504 JOINTING OF PIPES 27 CLAUSE 505 BACKFILLING OF TRENCHES AND FILTER DRAINS 28 CLAUSE 506 CONNECTING TO EXISTING DRAINS, CHAMBERS AND CHANNELS 28 CLAUSE 507 CHAMBERS 28 CLAUSE 508 GULLIES AND PIPE JUNCTIONS 29 CLAUSE 509 TESTING AND CLEANING 29 CLAUSE 511 LAND DRAINS 29
SERIES 600 - EARTHWORKS 29 CLAUSE 609 GEOTEXTILES USED TO SEPARATE EARTHWORKS MATERIALS 29 CLAUSE 616 PREPARATION AND SURFACE TREATMENT OF FORMATION 29 CLAUSE 618 TOPSOILING, GRASS SEEDING AND TURFING 29 CLAUSE 619 EARTHWORK environmental BUNDS 30 CLAUSE 620 LANDSCAPE AREAS 30
SERIES 700 - ROAD PAVEMENTS - GENERAL 31 CLAUSE 701 PAVEMENT CONSTRUCTION 31 CLAUSE 705 GENERAL REQUIREMENTS FOR SUB-BASES AND ROADBASES 32
-23 - CLAUSE 706 EXCAVATION TRIMMING AND REINSTATEMENT OF EXISTING SURFACES 32
SERIES 800 - ROAD PAVEMENTS - UNBOUND MATERIALS 32
SERIES 900 - ROAD PAVEMENTS - BITUMINOUS BOUND MATERIALS 32 CLAUSE 903 DENSE MACADAM ROADBASE 32 CLAUSE 906 DENSE MACADAM BASECOURSE 32 CLAUSES 910 & 911 ROLLED ASPHALT WEARING COURSE 32 CLAUSE 912 COARSE GRADED MACADAM WEARING COURSE 32 CLAUSE 915 COATED CHIPPINGS FOR APPLICATION TO PRE-MIXED SURFACINGS 33 CLAUSE 920 BOND OR TACK COATS AND OTHER BITUMINOUS SPRAYS 33 CLAUSE 921 SURFACE TEXTURE OF BITUMINOUS WEARING COURSES ON HIGH SPEED ROADS 33
SERIES 1000 - ROAD PAVEMENTS - CONCRETE & CEMENT BOUND MATERIALS 33
SERIES 1100 - KERBS, FOOTWAYS AND PAVED AREAS 33 CLAUSE 1101 PRECAST CONCRETE KERBS, CHANNELS EDGING AND QUADRANTS 33 CLAUSE 1104 FOOTWAYS AND PAVED AREAS (PRECAST CONCRETE FLAGS) 34 CLAUSE 1105 FOOTWAYS AND PAVED AREAS (FLEXIBLE SURFACING) 34 CLAUSE 1107 FOOTWAYS AND PAVED AREAS (CONCRETE BLOCK PAVING) 34 ADDITIONAL CLAUSE 1110 GRANITE SETTS AND KERBS 34
SERIES 1200 - TRAFFIC SIGNS 35 CLAUSE 1204 POSTS FOR PERMANENT TRAFFIC SIGNS 35 CLAUSE 1208 LOCATION AND ERECTION OF PERMANENT TRAFFIC SIGNS 35 CLAUSE 1212 ROAD MARKINGS 35
SERIES 1300 - ROAD LIGHTING COLUMNS AND BRACKETS 35 CLAUSE 1304 IDENTIFICATION AND LOCATION MARKINGS 35 CLAUSE 1305 INSTALLATION OF FOUNDATIONS, ANCHORAGES & ATTACHMENT SYSTEMS 35
SERIES 1400 - ELECTRICAL WORK FOR ROAD LIGHTING AND TRAFFIC SIGNS 36
SERIES 1500 to SERIES 2600 36
- 24 - SPECIFICATION : ADDITIONAL NOTES FOR GUIDANCE, PERMITTED ALTERNATIVES AND SUPPLEMENTARY NOTES.
SERIES 100 - PRELIMINARIES
CLAUSE 105 GOODS, MATERIALS, SAMPLING AND TESTING
i) The developer shall bear the cost of all tests, analyses and CCTV inspections required by the Engineer during the course of the works.
ii) Sampling and testing of mixtures and materials shall be carried out in compliance with the appropriate British Standards, as frequently as the Engineer may deem necessary to satisfy himself that they comply with the Specification.
iii) The Engineer reserves the right to core through the carriageway construction at any stage to determine the layer thickness, construction type and standard of installation. The cost of such coring, if it is found to be out of specification, shall be charged to the developer.
CLAUSE 112 SETTING OUT
i) It is the responsibility of the developer to set out the roadworks without assistance from the County Council. The right not to adopt incorrectly set out carriageways, either by level or alignment is reserved.
CLAUSE 113 PROGRAMME OF WORKS
i) The Engineer will require no programme of on-site works but the works must be completed in accordance with the provisions of the Section 38 Agreement.
ii) The Developer shall give the Engineer at least two week’s notice in writing of his intention to commence the roadworks, stating the date upon which he intends to proceed. The Engineer should be contacted via the Development Control Group. Telephone numbers are given in Appendix A.
iii) No road works shall commence on existing county roads until such time as an official notice of approval has been requested in writing by the developer and issued by the Engineer.
iv) The developer shall give the Engineer at least 48 hours notice of the following stages of road construction as required by the terms of the Section 38 Agreement to enable arrangements to be made for supervision, sampling and testing.
(a) The road drainage prior to the backfilling of trenches.
(b) The sub-formation prior to earthworks capping.
(c) The formation prior to the laying of the sub-base.
(d) The sub-base prior to the laying of the roadbase.
(e) The roadbase prior to the laying of the basecourse.
(f) The basecourse prior to the laying of the wearing course.
- 25 - SERIES 200 - SITE CLEARANCE
CLAUSE 202 EXISTING TREES, STUMPS AND ROOTS
i) Any existing trees on site, either the subject of a Tree Preservation Order or required by planning permission conditions to be retained, should only be treated following the approval of the appropriate authority.
ii) Trees and branches should allow 6m height clearance on the line of carriageways and 3m height clearance on the line of footways and footpaths.
iii) Choice of proposed road alignment should normally avoid routes beneath tree canopies.
SERIES 300 - FENCING
CLAUSE 303 TEMPORARY FENCING
i) Temporary fencing should be used in situations where it can effectively enhance public safety in areas where danger exists in the vicinity of any part of the site works. The developer should give due regard to the attraction of building sites to children from adjoining residential areas.
CLAUSE 306 PERMANENT FENCING
i) There is a general presumption against the adoption as part of the highway of fencing. The developer should ensure that permanent fencing on the highway boundary becomes the responsibility of the adjoining landowner.
CLAUSE 308 GATES AND STILES
i) The position of gates adjacent to the highway should be such that sufficient space is available to accommodate the longest anticipated regular vehicle using the access between the gates and the highway boundary.
ii) Gates shall not be permitted to open towards the highway.
SERIES 400 - SAFETY FENCES, SAFETY BARRIERS & PEDESTRIAN GUARDRAILS
CLAUSE 401 PERFORMANCE CRITERIA FOR SAFETY FENCES AND SAFETY BARRIERS
i) The use of safety fences on residential estate roads is undesirable and the layout should be designed so that their use is not required. In special circumstances, such as in the vicinity of pedestrian subways, bridges, steep embankments etc., their use may be required. Type and arrangement will be agreed with the Engineer.
CLAUSE 412 PEDESTRIAN GUARDRAILS
i) The use of pedestrian guardrails may be required by the Engineer in certain circumstances. Siting of guardrails and choice of type will have due regard to the safety of vehicles and pedestrians and shall not obstruct lines of visibility. Details are to be agreed with the Engineer.
- 26 - SERIES 500 - DRAINAGE AND SERVICE DUCTS
General drainage works shall comply with the requirements of the current edition of 'Sewers for Adoption' (as amended) published by the Water Research Centre.
CLAUSE 501 PIPES FOR DRAINAGE AND FOR SERVICE DUCTS
i) DRAINAGE. (Table 5/1)
a) All highway drains and filter drains shall be vitrified clay, concrete or unplasticised polyvinyl chloride.
b) All pipes in the carriageway and footway shall have mechanically flexible joints.
c) Pipes within industrial developments should be to BS 3506:1969
ii) SERVICE DUCTS
a) Pipes for service ducts shall be vitrified clay or unplasticised polyvinyl chloride.
CLAUSE 502 EXCAVATIONS FOR PIPES AND CHAMBERS
i) Excavations for pipes and chambers shall be carried out in accordance with accepted good practice and particular attention should be given to support of trench sides to ensure the safety of pipelaying operatives.
CLAUSE 503 BEDDING, LAYING AND SURROUNDING OF PIPES
i) All highway drains shall be bedded according the following alternatives:
a) Class B2 granular bed and surround, giving a bedding factor of 2.2 minimum.
b) Concrete grade ST1 bed and surround according to location and depth, i.e. where cover to pipe crown is less than 0.9m in verges or 1.2m in carriageways and footways.
ii) Refer to Drawing HE/12 for typical pipe bedding requirements.
iii) Pipe strengths shall be according to depth and location. The developer will be required to submit structural strength calculations to support his proposals.
CLAUSE 504 JOINTING OF PIPES
i) Joints on mechanically flexible jointed pipes that are damaged shall be rejected notwithstanding that they might pass an air test.
ii) Preformed joint fillers required under Clause 504.5 shall consist of bitumen impregnated insulating board to BS EN 120:1992 or other equally compressible material. The thickness of the compressible filler shall be as follows:-
Less than 450mm diameter 18mm.
450 mm - 1200mm diameter 36mm.
Exceeding 1200mm diameter 54mm.
- 27 - iii) Joint filler shall be used at all flexible joints on pipelines with concrete bed and surround.
CLAUSE 505 BACKFILLING OF TRENCHES AND FILTER DRAINS
i) Refer to Drawing HE/12 for general trench backfill requirements.
ii) The Engineer shall reserve the right to require that granular material Type 1 to Clause 803 or Type 2 to Clause 804 to be used as backfill to drainage trenches in the carriageway and footway, when excavated material is, in his opinion, unacceptable for return to the trench.
CLAUSE 506 CONNECTING TO EXISTING DRAINS, CHAMBERS AND CHANNELS
i) Connections to existing public sewers shall be subject to the approval of the appropriate Water Authority or its Agent District Council, under the provisions of the Water Industry Act 1991.
ii) Connections to watercourses (including non main and main rivers) shall be subject to the approval of the appropriate Water Authority, under the provision of the Control of Pollution Act 1974 and the Land Drainage Act 1976, or the Environment Agency.
iii) Connections involving openings in existing County Roads will be subject to the written approval of the Engineer under the provisions of the New Roads and Street Works Act 1991.
iv) Saddle connections to existing highway drains shall be individually inspected by the Engineer's representative so that the integrity of the existing pipe can be ascertained and the internal joint tested to ensure no lipping exists and that the seat is adequate. No backfilling or concrete surround should be placed on the joint prior to inspection.
CLAUSE 507 CHAMBERS
i) Chambers, manholes, catchpits and inspection chambers shall be constructed from either:-
a) Precast Concrete to BS 5911:Part.2:1982 Cl.207.4
b) Brickwork to Clause 507.3
ii) Manholes will accord with the requirements of the current edition of 'Sewers for Adoption', published by the Water Research Centre.
iii) Manhole covers and frames shall be in accordance with Clause 4.2.32 of 'Sewers for Adoption'.
iv) Double-triangular square covers Type MA 60 (or MB1.60) are preferred.
v) Covers must be kitemarked.
- 28 - CLAUSE 508 GULLIES AND PIPE JUNCTIONS
i) Gullypots shall be trapped, internal diameter 450mm, depth 900mm, and either
a) Precast concrete to BS 5911:Part 230:1994
b) Vitrified clay to BS 65:1991
c) UPVC to BS 4660:1969
ii) Gully gratings shall be of the retained hinge type, BS EN 124:1994 reference GA2-450 (for Type 1,2 and Industrial estate roads) or GB-325.
iii) Refer to Drawing HE/14 for typical gully construction requirements.
iv) Refer to Drawing HED/15 for determining gully spacing according to road width and gradient. All paved areas and embankments in excess of 1 in 5 are to be considered in the determination of contributing areas.
v) Gully connections are to be constructed of rigid pipes with flexible joints, and surrounded with grade ST1 concrete where depth of cover is less than 1.2m.
CLAUSE 509 TESTING AND CLEANING
i) Where highway drains are to be adopted by the Highway Authority, a CCTV survey shall be arranged and a full report submitted. This should be carried out prior to the wearing course being laid on carriageways and footways.
CLAUSE 511 LAND DRAINS
i) Land drains severed by the works shall only be connected to the public sewerage system (via highway drainage) with the consent of the appropriate Water Authority or its agent.
SERIES 600 - EARTHWORKS
CLAUSE 609 GEOTEXTILES USED TO SEPARATE EARTHWORKS MATERIALS
i) The grade and extent of use of geotextile membranes shall be determined in specific cases where their use is deemed to be appropriate by the Engineer.
CLAUSE 616 PREPARATION AND SURFACE TREATMENT OF FORMATION
i) The developer shall give the Engineer at least 48 hours notice of his intention to prepare the formation.
ii) No formation preparation works should be undertaken until all sub-carriageway drainage, ducting and service crossings (if possible) have been completed and accepted.
CLAUSE 618 TOPSOILING, GRASS SEEDING AND TURFING
i) Refer to Specification included in W.C.C. publication entitled 'Landscaping in Residential Developments' available from the Department of Environmental Services.
- 29 - CLAUSE 619 EARTHWORK ENVIRONMENTAL BUNDS
i) The developer should make arrangements with the District Council for future maintenance of earthworks environmental bunds required by the local Planning Authority and they will not normally be accepted for adoption as highway.
CLAUSE 620 LANDSCAPE AREAS
i) Landscape areas forming part of the adoptable highway shall be planted with due regard to visibility requirements. No shrubs or trees shall be planted in areas designated for junction or forward visibility purposes if they would restrict visibility. In certain instances shrubs of mature height not exceeding 600mm may be acceptable. (The County Landscape Engineer will advise on appropriate species)
ii) Batters and slopes on landscape areas or verges adjacent the highway shall not exceed an inclination of 1 in 1.5. The top and the bottom of such batters and slopes shall be provided with a berm of minimum width 1m with a maximum inclination of 1 in 20 falling in the same direction as the main batter or slope. Footpaths or footways shall not be deemed to form part of any berm.
iii) Refer to Clause 618 for Specification.
- 30 - SERIES 700 - ROAD PAVEMENTS - GENERAL
CLAUSE 701 PAVEMENT CONSTRUCTION
i) Pavement construction thickness will vary according to the designated road type or category as laid down in the 'Residential Road Design' guide published by the County Council. Refer to Drawings HE/01 and HE/02 for details.
ii) Carriageways
a) Road Sub-base.
Granular sub-base material Type 1 to Clause 803.
b) Roadbase
Coarse-graded Bitumen Macadam Roadbase material to Clause 903 and BS 4987:Part1:1993 Clause 5.2.
c) Basecourse
Coarse-graded Bitumen Macadam Basecourse Material to Clause 906 and BS 4987:Part1:1993 Clause 6.5.
d) Wearing Course
Hot Rolled Asphalt wearing course material to Clause 910 or 911. or Thin Wearing Course to Clause 942 (Stone Mastic Asphalt) or Coarse-graded Bitumen Macadam wearing course material to BS 4987:Part1:1993 Clause 7.5. or Concrete Block Paving to Clause 1107.
iii) Footways And Footpaths
a) Sub-base.
Granular Sub-base Material Type 1 to Clause 803.
b) Basecourse
Coarse-graded Bitumen Macadam Basecourse Material to Clause 906 and BS 4987:Part1:1993 Clause 6.5.
c) Wearing Course
Coarse-graded Bitumen Macadam wearing course material to BS 4987:Part1:1993 Clause 7.5. or Concrete Block Paving to Clause 1107.
iv) The Engineer's representative is to be given at least 48 hours notice by the developer of his intention to lay any pavement course so that the immediate condition of the receiving layer may be examined for compliance with the specification.
- 31 - CLAUSE 705 GENERAL REQUIREMENTS FOR SUB-BASES AND ROADBASES
i) The developer shall make good any damage caused by frost heave that might result from a delay in ensuring that sufficient depth of road construction has been provided during the progress of development.
CLAUSE 706 EXCAVATION TRIMMING AND REINSTATEMENT OF EXISTING SURFACES
i) Refer to Drawing HE/13 for typical reinstatement requirements in bituminous surfaced highway.
SERIES 800 - ROAD PAVEMENTS - UNBOUND MATERIALS
Unbound roadbase materials will not be permitted unless expressly required by the Engineer.
SERIES 900 - ROAD PAVEMENTS - BITUMINOUS BOUND MATERIALS
CLAUSE 903 DENSE MACADAM ROADBASE
i) Roadbase shall be to BS 4987:Part1:1993 Clause 5.2. 28mm nominal size aggregate.
CLAUSE 906 DENSE MACADAM BASECOURSE
i) Basecourse shall be to BS 4987:Part1:1993 Clause 6.5. 20mm nominal size aggregate.
CLAUSES 910 & 911 ROLLED ASPHALT WEARING COURSE
i) Rolled asphalt wearing course shall be to BS 594:Part 1:1992.
a) Table 3 Column 9 (Type F) or Table 4 Column 15 (Type C) (30% stone content). 14mm nominal size. - for roads 1500 c.v.d. Design speed 50 kph.
b) Table 5 Column 21 (Type F) or Table 6 Column 26 (Type C) (30% stone content). 14mm nominal size. - for roads 1500 c.v.d. Design speed 50 kph.
c) High Stone Asphalt: Table 3, Column 12, (Type F) or Type C to W.C.C. requirements. 14mm nominal size and agreed binder content. Design Speed 50 kph.
CLAUSE 912 COARSE GRADED MACADAM WEARING COURSE
i) Coarse-graded bitumen macadam wearing course material shall comply with BS 4987:Part1:1993 Clause 7.5.
- 32 - CLAUSE 915 COATED CHIPPINGS FOR APPLICATION TO PRE-MIXED SURFACINGS
i) Coated Chippings shall be:-
Nominal size: 20mm.
Polished Stone Value: 55 (MINIMUM)
Aggregate Abrasion Value: 14 (MAXIMUM).
Texture Depth (as measured by the sand replacement test): 1.3.
CLAUSE 920 BOND OR TACK COATS AND OTHER BITUMINOUS SPRAYS
i) Tack coat shall be used on all basecourse layers prior to the application of wearing course unless the wearing course layer is applied immediately after rolling of the basecourse and prior to its use by any traffic. The tack coat shall be of a cationic type.
CLAUSE 921 SURFACE TEXTURE OF BITUMINOUS WEARING COURSES ON HIGH SPEED ROADS
i) Amended Note for Guidance
The average Sensor Measured Texture Depth (SMTD) determined by the TRRL Mini Texture Meter for each 1000m section of carriageway lane tested shall be not less than 0.9mm, and the average for each 50m length shall be not less than 0.8mm nor greater than 2mm.
SERIES 1000 - ROAD PAVEMENTS - CONCRETE AND CEMENT BOUND MATERIALS
Rigid and composite road pavements will not normally be acceptable for residential estate roads or industrial estate roads.
SERIES 1100 - KERBS, FOOTWAYS AND PAVED AREAS
CLAUSE 1101 PRECAST CONCRETE KERBS, CHANNELS EDGING AND QUADRANTS
i) The following BS 7263:Part1:1994 Figure Numbers shall normally be required.
a) Carriageway Kerb - Figure 7; or Figure 5 on Distributor Roads with verges.
b) Channels - Figure 8 (Type 1 & 2 roads and industrial estate roads).
(125 x 150 Channels otherwise complying with BS 7263:Part1:1994 shall be used on Type 3, 4 and 5 roads).
c) Edgings to footways, footpaths and verges - Figure 11 (50 x 150).
d) Small unit precast concrete block kerbing. N.B. This type of kerbing shall be flush.
- 33 - CLAUSE 1104 FOOTWAYS AND PAVED AREAS (PRECAST CONCRETE FLAGS)
i) Precast concrete flags will not normally be a permitted alternative for new works, unless expressly required by the Engineer.
ii) Sub-base shall be 225mm thick Type 1 to Clause 803.
CLAUSE 1105 FOOTWAYS AND PAVED AREAS (FLEXIBLE SURFACING)
i) Basecourse
a) Footway basecourse shall be coarse-graded bitumen macadam basecourse material to Clause 906 and BS 4987:Part1:1993 Clause No. 6.5. 20mm nominal size aggregate.
b) Basecourse thickness shall be 60mm. (Compacted)
ii) Wearing Course
a) Coarse-graded bitumen macadam, 6mm nominal size, complying with BS 4987:Part1:1993 Clause 7.5.
b) Wearing Course thickness shall be 20mm (compacted).
CLAUSE 1107 FOOTWAYS AND PAVED AREAS (CONCRETE BLOCK PAVING)
i) Blocks shall comply with the relevant requirements of BS 6717:Part 1:1993.
ii) Concrete block paving shall be laid to a herringbone pattern.
iii) In carriageways concrete blocks shall be 80mm thick.
iv) In footways concrete blocks shall be 65mm thick.
v) Blocks shall be rectangular in plan, 200mm long and 100mm wide, BS Type R. The colour should be discussed with the County Council prior to ordering.
ADDITIONAL CLAUSE 1110 GRANITE SETTS AND KERBS
i) Granite setts shall comply with the relevant provisions of BS 435:1975 Specification for dressed natural stone kerbs, channels, quadrants and setts. They shall be laid and bedded on a layer of Class 1 mortar complying with Clause 2404, not less than 10mm and not greater than 20mm thick, on a Grade ST1 concrete foundation. All units shall be backed with Grade ST1 concrete.
ii) Refer to Drawing HE/10 for preferred edging details.
- 34 - SERIES 1200 - TRAFFIC SIGNS
The developer shall be responsible for the provision, erection and servicing of all signs, bollards and road markings required in connection with the development both on the newly constructed roads and on the existing road system where such are required as a consequence of the development.
The road-marking layout for a simple priority junction is shown on Drawing HE/11.
The Developer will be notified by the Engineer of any appropriate additional road marking and signage.
CLAUSE 1204 POSTS FOR PERMANENT TRAFFIC SIGNS
i) The developer should ensure that, where practicable, the number of signposts are kept to a minimum. When joint use of signposts is possible, or where sign can properly be attached to street lighting columns, the opportunity should be used, with the approval of the Lighting Engineer in the latter case.
CLAUSE 1208 LOCATION AND ERECTION OF PERMANENT TRAFFIC SIGNS
i) The location of street nameplates, when placed within the limits of the adoptable highway, shall be agreed on site by the Engineers representative. Permanent street nameplates located on footways and footpaths must be erected prior to the laying of wearing course material.
(The Specification for Street Nameplates is a responsibility of the District Council, which is also the Street naming Authority).
CLAUSE 1212 ROAD MARKINGS
i) If required by the developer the Engineer will arrange for the County Council to carry out road marking works, subject to the receipt of an official order.
SERIES 1300 - ROAD LIGHTING COLUMNS AND BRACKETS
Refer to Drawing HE/16 for general location requirements, electrical requirements and permitted alternatives.
CLAUSE 1304 IDENTIFICATION AND LOCATION MARKINGS
i) Location marks for inspection and maintenance purposes shall be as follows:-
Road Number, displayed vertically on the column in white 50mm 'x' height letters above Item Number displayed vertically in yellow 50mm. 'x' height letters all on a black painted background panel, width 75mm height to suit.
The lowest Item Number in yellow shall be 2m above the ground level.
CLAUSE 1305 INSTALLATION OF FOUNDATIONS, ANCHORAGES AND ATTACHMENT SYSTEMS
i) Planting depths of columns are indicated on Drawing HE/16.
- 35 - SERIES 1400 - ELECTRICAL WORK FOR ROAD LIGHTING AND TRAFFIC SIGNS
The developer should note that all electricity supply cables to residential and industrial estate roads will be the responsibility of the Southern Electricity Board up to, and including, the cut out.
All arrangements for servicing must be made via the Board’s regional offices, not via the County Council.
SERIES 1500 to SERIES 2600
The above series of the specification will not normally apply to residential and industrial estate roads; when major structures form part of the development proposals for adoption then early discussions should be entered into by the developer with the County Council to ensure that specific approvals are obtained, when required, from the Engineer.
- 36 - APPENDIX A Contact Numbers
DEVELOPMENT CONTROL GROUP
Group Manager Philip Tilley 01225 713441
North Wilts & West Wilts Districts
Principal Assistant Allan Creedy 01225 713444 DC Assistant – North Wilts 01225 713447 DC Assistant – West Wilts Amanda Hall 01225 713323 DC Assistant – North & West Wilts 01225 713463 Salisbury & Kennet Districts
Principal Assistant Ian Postlethwaite 01225 713442 DC Assistant – Salisbury John Harding 01225 713440 DC Assistant – Kennet Mark Wiltshire 01225 713448
General Enquiries Linda Morant 01225 713337
Fax 01225 713207
NEW ROADS & STREET WORKS ACT CO-ORDINATORS (See map - Page 40)
AREAS 1 – 4 (Melksham)
Dominic Gorton Tel: 01225 702649 Fax: 01225 709785
AREAS 5 – 8 (Salisbury)
Tony Higgins Tel: 01722 326426 Fax: 01722 326233
HQ (County Hall)
Don Jest Tel: 01225 713496 Fax: 01225 713400
- 37 - APPENDIX A (continued)
AREA HIGHWAY OFFICES (See map - Page 40)
Highway Areas Manager Roger Pearce Tel: 01225 713434 Fax: 01225 713400
Area 1 - Wootton Bassett Tel: 01793 850222 Fax: 01793 840052
District Surveyor Chris Rose Senior Highway Technician Geoff Hiscock Highway Technician Geoff Woodward
Area 2 - Calne Tel: 01249 814000 Fax: 01249 814440
District Surveyor Chris Rose Highway Technician Terry Reynolds
Areas 3 & 4 - Melksham Tel: 01225 702649 Fax: 01225 709785
District Surveyor Ian Janes Senior Highway Technician Pat Whyte Senior Highway Technician Andrew Cadwallader Highway Technician Bryan Smith
Area 5 - Devizes Tel: 01380 722111 Fax: 01380 728111
District Surveyor Graeme Hay Senior Highway Technician Tony Amer
Area 6 - Marlborough Tel: 01672 513157 Fax: 01672 511895
District Surveyor Graeme Hay Senior Highway Technician Dennis Compton Highway Technician Richard Spanswick
Areas 7 & 8 - Salisbury Tel: 01722 326426 Fax: 01722 326233
Area Highway Surveyor Brian Lanham Senior Highway Technician Graham Axtell Highway Technician Terry Smith Highway Technician Bob Crean
- 38 - APPENDIX A (continued)
HIGHWAY INSPECTORS (See map – Page 40) Tel: 01225 756600 Fax: 01225 756611
AREAS 1 & 2 Wayne Frankham Mobile: 07712 490087
AREAS 3 & 5 Andy Gale Mobile: 07712 490091
AREAS 4 & 7 Dave Button Mobile: 07712 490102
AREAS 6 & 8 Tim Bale Mobile: 07712 490088
- 39 - APPENDIX A (continued)
Highway Area Map
- 40 - APPENDIX B
FORM NO. 1A AGR …………
WILTSHIRE COUNTY COUNCIL
DEPARTMENT of ENVIRONMENTAL SERVICES
Application for an Agreement under Section 38 of the Highways Act, 1980
Housing Development ……………………………………………………………………………….…………
…………………………………………………………………………………………
I/we make application to the County Secretary and Solicitor of the Wiltshire County Council to enter into an Agreement under Section 38 of the Highways Act, 1980, following approval by the Director of Environmental Services of the plans and sections relating to the above-mentioned development, particulars whereof are set out below.
Signed by the Developer or on his behalf ……………………………………………………………..
Date …………………………… Ref …………………………………………………………….
1. Full name(s) of Developer. N.B. Where the Developer is a firm please state separately the full names of each Partner and the trading name of the firm.
2.(a) Please say whether the land to be dedicated as highway is registered at H.M. Land Registry with Title Absolute. If so, please give Title Numbers(s).
2.(b) Please state whether the freehold ownership of the land and all land required for sight lines as indicated on the plans approved by the Director of Environmental Services is vested in the Developer. If not, please give full particulars of ownership.
2.(c) If the proposed surface water drainage system is to pass over land not in the Developer's ownership then please give full particulars of ownership and say whether the consent of the adjoining owner or owners has been obtained for such surface road water.
- 41 - 3. Address or registered office in the case of a Limited Company.
4. Name and address or registered office of Surety. The Bond (where applicable) must either be with one of the Joint Stock Clearing Banks or with an Insurance Company registered as a member with the Association of British Insurers.
5. If it is proposed to instruct Solicitors, please give their name and address and reference, if known.
6. Please state the proposed date for the commencement of works.
N.B. Building work should NOT commence on the development until the required deposit under the Advance Payments Code has been paid (where applicable) or an Agreement under Section 38 of the Highways Act, 1980 has been entered into supported by a Bond or cash deposit. Planning Permission must also have been obtained and plans passed under Building Regulations by the District Council.
7. Please give, according to your current programme for the whole of roadworks covered by the proposed agreement.
(a) Estimated date of completion...... /...... /......
(b) Estimated date of completion of Part 1 Works i.e., road and footways up to base course stage...... /...... /......
- 42 - APPENDIX C List of Applicable British Standards
BS 65:1991 Specification for vitrified clay pipes, fittings and ducts, also flexible mechanical joints for use solely with surface water pipes and fittings
BS 435:1975 Specification for dressed natural stone kerbs, channels, quadrants and setts
BS 594:Part 1:1992 Hot rolled asphalt for roads and other paved areas
BS 729:1971 Specification for hot dip galvanized coatings on iron and steel articles
BS 1247:Part 1:1990 Specification for galvanized ferrous or stainless steel manhole steps
BS 1377:1990 Methods of Test for Soils for Civil Engineering Purposes
BS 3262:Part 1:1989 Hot-applied thermoplastic road marking materials
BS 3506:1969 Specification for unplasticized PVC pipe for industrial uses
BS 4987:Part 1:1993 Coated macadam for roads and other paved areas
BS 5328:1997 Concrete
BS 5400 Steel, Concrete and Composite Bridges
BS 5489:1992 Road lighting
BS 5837:1991 Guide for trees in relation to construction
BS 5911:Part 2:1982 Precast concrete pipes, fittings and ancillary products Specification for inspection chambers
BS 5911:Part 230:1994 Precast concrete pipes, fittings and ancillary products Specification for road gullies and gully cover slabs
BS 5930:1981 Code of Practice for Site Investigations
BS 6717:Part 1:1993 Precast concrete paving blocks
BS 7263:Part 1:1994 Precast concrete flags, kerbs, channels, edgings and quadrants
BS 7818:1995 Specification for pedestrian restraint systems in metal
BS 8004:1986 Code of practice for foundations
BS 8006:1995 Code of Practice for Strengthened / Reinforced Soils and Other Fills
BS EN 120:1992 Wood based panels. Determination of formaldehyde content. Extraction method called the perforator method
BS EN 124:1994 Gully tops and manhole tops for vehicular and pedestrian areas. Design requirements, type testing, marking, quality control
- 43 - APPENDIX D
DESIGN AND SPECIFICATION DRAWINGS
A - Specification Drawings
HE /01 Road Construction Details /02 Road Construction Specification /03 Shared Surface Road - Access Way /04 Access Way Entrance Ramp Details /05 Typical Access Way Junction Details /06 Footway Construction Details /07 Cycleway Construction Details /08 Vehicular Crossing Details /09 Industrial Road Footway Crossings /10 Kerb / Edging Details /11 Road Markings for Simple Priority Junctions within Housing Estates /12 Pipe Bedding & Trench Backfill Details /13 Reinstatement in Existing Highways /14 Gully Detail /15 Service Duct Details /16 Road Lighting - Siting and Erection Details /17 Roundabout Central Island Details. /18 Pedestrian Guardrails /19 Typical Soakaway Details
B - Design Drawings
HED /01 Turning Head Details - Residential /02 Turning Head Details - Industrial /03 Dimensions Required to Provide Car Turning within Site Curtilage /04 Traffic Calming Devices - Speed Control Bend /05 Traffic Calming Devices - Mountable Shoulder on Speed Control Bend /06 Traffic Calming Devices - Table Junction /07 Traffic Calming Devices - Roundabout /08 Traffic Calming Devices - Chicane /09 Traffic Calming Devices - Build-out /10 Lay-by Details (Residential) /11 Road Crossing Facility Details /12 Design Criteria for Private Drives /13 Footpath Staggered Barrier Layout /14 Footpath Staggered Barrier Details /15 Gully Spacing Requirements /16 Disposition of Services in Footways
Note: - The above drawings are not considered to be copyright and may be copied, incorporated in developer's drawings or referred to on those Drawings. However, it should be noted that any errors in copying will be taken as such and the Specification and Drawings herein will be deemed to apply.
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