f.24 - cornwall.gov.uk · series title value. 200 site clearance £8,355.26 300 fencing £50,296.70...

Appendix D Launceston Southern Link Road

F.24.6

MEMORANDUM

- 1 - Memo Launceston Southern Link Road 150923.docx

To: Rebecca Jackson At: Cornwall Council

From: Ben Smith-Laing At: Parsons Brinckerhoff

Date: 23rd

September 2015 Ref: T5070-004 / 3513000GQ

Subject: LAUNCESTON SOUTHERN LINK ROAD

Introduction

There is a local desire to deliver a Southern Link Road (SLR) in Launceston to support higher growth levels and provide sustainable access to the proposed development cells south of the A30, while reducing pressure on the A30 and adjacent junctions.

Parsons Brinckerhoff are commissioned by Cornwall Council to develop alignment options for the proposed SLR. This note summarises the two likely alignments identified for the SLR based on topography, key points along the route and access requirements. Indicative cost estimates are also provided for these two routes in this note.

Key issues

The main constraints for the road route are:

Steep and challenging topography to south of Launceston;

Requirement to preserve potential development plots along route;

Consented development at western end of route on ‘Link Road’

Trees along Link Road;

Potential tie in points with existing highways

At this stage, the potential benefits of the SLR have not been examined through highways modelling.

Design Rationale

The route design has been carried out in consultation with Cornwall Council officers. There is a consented mixed-use development site at the western end of Link Road. It is understood that this has been designed to allow the new road to tie in to a roundabout within the site, and hence to the signal junction that forms the site access to the consented development site. This approach will also prevent the disruption of the avenue of trees on Link Road. This proposed signal junction lies shortly to the east of the Penygillam junction. The SLR would run from the above signal junction east to Landlake Road and then across to join the A388. It would also permit future access into any development sites to the west of Landlake Road, as it could potentially be extended into this area by a developer.

Geometry

Geometry of the SLR has been set out at 7.3m wide single carriageway with 2.0m verges and 1:2.5 earthwork slopes. Horizontal alignment complies with the Design Manual for Roads and Bridges for a design speed of 40mph. Tie in points to the existing highway network will be via roundabout junctions. These generally offer efficient operation, and are likely to show a ‘worst case’ in terms of land take.

Route Alignments

Two potential alignments have been drawn up (Route A and Route C). These are shown in Appendix A of this document. The reason for the two routes is to look at options that minimise the land take and extensive earthworks that will be required to deal with the challenging topography along the route.

- 2 -

The drawings of both routes indicate a large area of embankment spanning the Lowley Brook valley approximately 1/3 of the way along the route heading east to west. In terms of construction and environmental impact, this is unlikely to be a practical solution and this element has therefore been accounted for within the cost estimates as a concrete span bridge. For route A, the required span would be 235m and for route C, the required span would be 143m. These are large structures and form a significant portion of the costs.

Cost Estimates

Preliminary cost estimates have been produced for both route alignments. As set out earlier, both estimates exclude any works that may be required to the Landlake Road / Link Road junction.

The costs for the two routes are as follows:

Route A - £30.7m

Route C - £24.1m

It is likely that any future delivery of these schemes would be phased along with development. In order to help understand how this phased approach might happen, the above cost estimates have been broken down into smaller sections, as approximately indicated in the following diagram:

Figure 1: Cost Estimate Scheme Sections

These can be summarised as follows:

Route A

Section A Ch0 to Ch850 £2,141,882

Section B Ch850 - Ch1570 £3,022,354

Section C Ch1570 - 1750 (Structure) £21,023,090

Section D Ch1750 - Tavistock Road £2,032,827

Section E Ch0 – Link Road Development £2,463,457

Total Works Costs £30,683,610

Section A

Section B

Section C

Section D

Section E

- 3 -

Route C

Section A Ch0 to Ch850 £2,611,952

Section B Ch850 - Ch1570 £3,095,975

Section C Ch1570 - 1750 (Structure) £13,071,430

Section D Ch1750 - Tavistock Road £2,547,559

Section E Ch0 – Link Road Development £2,727,742

Total Works Costs £24,054,658

The full cost estimates are included as Appendix B of this document.

Conclusion

Two SLR alignments developed are feasible and likely to give very similar operational benefits. On this basis, it is considered that Route C would be more viable mainly due to its lower cost.

Appendix A Route Alignments

Filename: M:\Projects\TRANSPORTATION\3513000GR-HLV T5070-003 Launceston Bridge\Documents\Drawings\Working\31513000GQ-HLV-SK07.dwgPlot Date: 05.06.14

DRAWING NO: REVISION:

SCALE:

DRAWN BY:

CHECKED: APPROVED:

PROJECT MANAGER:

DRAWING TITLE:

PROJECT:

NOTES:

1. All dimensions are in metres unless otherwise stated.

2. Do not scale from this drawing.

This drawing is Copyright. It should not be relied on

or used in circumstances other than those for which it

was originally prepared and for which Cornwall Council

was originally commissioned. Cornwall Council accepts

no responsibility for this drawing to any party other than

the person(s) by whom it was commissioned.

REV DATE NATURE OF REVISION

REVISIONS

- FIRST ISSUE

SOLUTIONS

T5070-004

Launceston

General Arrangement

Route A

Version 3

Plan 1:2500 @ A1 ; Long Section NTS

BSL AHS

BSL 10/09/2015 BSL 10/09/2015

3513000GQ-HLV-007 -

10/09/2015

Crown copyright and database rights 2015 Ordnance Survey 100049047.

NOTES:



LONG SECTION NOT TO SCALE

ROUNDABOUT LAYOUT IS

INDICATIVE ONLY AND

SHOWS A FOOTPRINT FOR

A 30m ICD ROUNDABOUT.


INDICATIVE ONLY AND




INDICATIVE ONLY AND




INDICATIVE ONLY AND



Additional land take required due to forward visibility

Filename: M:\Projects\TRANSPORTATION\3513000GR-HLV T5070-003 Launceston Bridge\Documents\Drawings\Working\31513000GQ-HLV-SK08.dwgPlot Date: 05.06.14

DRAWING NO: REVISION:

SCALE:

DRAWN BY:

CHECKED: APPROVED:

PROJECT MANAGER:

DRAWING TITLE:

PROJECT:

NOTES:



This drawing is Copyright. It should not be relied on

or used in circumstances other than those for which it

was originally prepared and for which Cornwall Council

was originally commissioned. Cornwall Council accepts

no responsibility for this drawing to any party other than

the person(s) by whom it was commissioned.

REV DATE NATURE OF REVISION

REVISIONS

- FIRST ISSUE

SOLUTIONS

T5070-004

Launceston

General Arrangement

Route C

Version 3

Plan 1:2500 @ A1 ; Long Section NTS

BSL AHS

BSL 10/09/2015 BSL 10/09/2015

3513000GQ-HLV-008 -

10/09/2015

Crown copyright and database rights 2015 Ordnance Survey 100049047.

NOTES:



LONG SECTION NOT TO SCALE


INDICATIVE ONLY AND




INDICATIVE ONLY AND




INDICATIVE ONLY AND




INDICATIVE ONLY AND



Additional land take required due to forward visibility

Appendix B Preliminary Cost Estimates

Series Title Value

200 Site Clearance £27,098.25

300 Fencing £123,744.23

400 Road Restraint Systems (Vehicle and Pedestrian) £2,917.60

500 Drainage £653,551.47

600 Earthworks £723,324.33

700 Pavements £1,368,785.34

1100 Kerbs, Footways & Paved Areas £78,794.36

1200 Traffic Signs & Road Markings £21,064.27

1300 Road Lighting £155,803.96

1700 Structural Concrete £6,350,000.00

3000 Landscaping and Ecology £19,470.48

Sub Total (£) £9,524,554.28

-Uplift to Spons rates for 6% contractor's overheads

and 4% contractor's profit 10.24% £975,314.36

£10,499,868.64

100 Preliminaries 15% £1,574,980.30

100 Traffic Management 20% £2,099,973.73

2700 Accomodation Works, Works for Statutory Undertakers 15% £1,574,980.30

Works Total (£) £15,749,802.96

- Optimism Bias Standard Civil Engineering) 44% £6,929,913.30

Total Works Costs £22,679,716.27

- Risk Allowance £394,587.50

- Design Fee 10% £2,267,971.63

- Client costs 5% £1,133,985.81

- Contract document preparation, procurement, etc. 3% £680,391.49

- Contract administration 5% £1,133,985.81

- Survey costs £125,000.00

- Supervision fees 10% £2,267,971.63

- Land cost (assumed value) £0.00

Grand Total (£) £30,683,610.14

Notes:

Land cost has not been included as it is currently unknown

Rates are based on construction taking place in the current year so cost shown would be subject to inflation in future years

Project Title: T5070-004 Launceston Link Road Option A

Drawing Reference: 3513000GQ-HLV-SK07

Date: Q3 2015 - 10/09/2015

The rates used in costing this series have been taken from Spon's Civil Engineering & Highway Works Price Book 2015 (29th

Edition)

Cost Summary

Bill of Quantities: Feasibility Study

Project Number: 3513000GQ-HLV

Sub Total Works Cost (£)

Series Title Value


300 Fencing £29,171.51

400 Road Restraint Systems (Vehicle and Pedestrian) £0.00

500 Drainage £114,896.94

600 Earthworks £216,022.45

700 Pavements £239,288.14




1700 Structural Concrete £0.00


Sub Total (£) £658,023.09



£725,404.65

100 Preliminaries 15% £108,810.70

100 Traffic Management 20% £145,080.93

2700 Accomodation Works, Works for Statutory Undertakers 15% £108,810.70

Works Total (£) £1,088,106.98

- Optimism Bias Standard Civil Engineering) 44% £478,767.07



- Design Fee 10% £156,687.41

- Client costs 5% £78,343.70


- Contract administration 5% £78,343.70


- Supervision fees 10% £156,687.41


Grand Total (£) £2,141,881.60

Notes:

Risk Allowance is apportioned between sections based on percentage of Total Works Cost



Bill of Quantities: Feasability Study Section A


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £50,296.70


500 Drainage £163,185.95

600 Earthworks £138,130.96

700 Pavements £490,301.50






Sub Total (£) £936,189.66



£1,032,055.48

100 Preliminaries 15% £154,808.32



Works Total (£) £1,548,083.22




- Design Fee 10% £222,923.98

- Client costs 5% £111,461.99






Grand Total (£) £3,022,354.11

Notes:




Bill of Quantities: Feasability Study Section B


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £0.00


500 Drainage £55,664.23

600 Earthworks £30,201.80

700 Pavements £104,860.00



1300 Road Lighting £0.00



Sub Total (£) £6,558,515.86



£7,230,107.88

100 Preliminaries 15% £1,084,516.18



Works Total (£) £10,845,161.82




- Design Fee 10% £1,561,703.30

- Client costs 5% £780,851.65






Grand Total (£) £21,023,089.84

Notes:




Bill of Quantities: Feasability Study Section C


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £14,504.60


500 Drainage £129,117.97

600 Earthworks £132,721.20

700 Pavements £277,313.00






Sub Total (£) £627,122.16



£691,339.47

100 Preliminaries 15% £103,700.92



Works Total (£) £1,037,009.20




- Design Fee 10% £149,329.33

- Client costs 5% £74,664.66






Grand Total (£) £2,032,827.33

Notes:



Bill of Quantities: Feasability Study Section D


Date: Q3 2015 - 10/09/2015


Cost Summary



Edition)



Series Title Value


300 Fencing £29,771.42


500 Drainage £190,686.38

600 Earthworks £206,247.92

700 Pavements £257,022.70






Sub Total (£) £744,703.53



£820,961.17

100 Preliminaries 15% £123,144.17



Works Total (£) £1,231,441.75




- Design Fee 10% £177,327.61

- Client costs 5% £88,663.81






Grand Total (£) £2,463,457.24

Notes:

Risk Allowance is apportioned average of Sections A-D



Bill of Quantities: Feasability Study Section E


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £125,054.23


500 Drainage £653,551.47

600 Earthworks £1,128,864.67

700 Pavements £1,368,785.34






Sub Total (£) £7,431,404.63



£8,192,380.46

100 Preliminaries 15% £1,228,857.07



Works Total (£) £12,288,570.69




- Design Fee 10% £1,769,554.18

- Client costs 5% £884,777.09






Grand Total (£) £24,054,658.08

Notes:



Project Title: T5070-004 Launceston Link Road Option C


Date: Q3 2015 - 10/09/2015


Edition)

Cost Summary

Bill of Quantities: Feasibility Study



Series Title Value


300 Fencing £29,171.51


500 Drainage £114,896.94

600 Earthworks £360,555.45

700 Pavements £239,288.14






Sub Total (£) £802,556.09



£884,737.83

100 Preliminaries 15% £132,710.67



Works Total (£) £1,327,106.75




- Design Fee 10% £191,103.37

- Client costs 5% £95,551.69






Grand Total (£) £2,611,951.83

Notes:




Bill of Quantities: Feasability Study Section A


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £50,296.70


500 Drainage £163,185.95

600 Earthworks £157,618.50

700 Pavements £490,301.50






Sub Total (£) £955,677.20



£1,053,538.54

100 Preliminaries 15% £158,030.78



Works Total (£) £1,580,307.81




- Design Fee 10% £227,564.33

- Client costs 5% £113,782.16






Grand Total (£) £3,095,975.02

Notes:




Bill of Quantities: Feasability Study Section B


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £0.00


500 Drainage £55,664.23

600 Earthworks £31,691.50

700 Pavements £104,860.00



1300 Road Lighting £0.00



Sub Total (£) £4,060,005.56



£4,475,750.12

100 Preliminaries 15% £671,362.52



Works Total (£) £6,713,625.19




- Design Fee 10% £966,762.03

- Client costs 5% £483,381.01






Grand Total (£) £13,071,430.00

Notes:




Bill of Quantities: Feasability Study Section C


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £15,814.60


500 Drainage £129,117.97

600 Earthworks £289,301.00

700 Pavements £277,313.00






Sub Total (£) £785,011.96



£865,397.18

100 Preliminaries 15% £129,809.58



Works Total (£) £1,298,095.77




- Design Fee 10% £186,925.79

- Client costs 5% £93,462.90






Grand Total (£) £2,547,559.00

Notes:




Bill of Quantities: Feasability Study Section D


Date: Q3 2015 - 10/09/2015

Cost Summary



Edition)



Series Title Value


300 Fencing £29,771.42


500 Drainage £190,686.38

600 Earthworks £289,698.22

700 Pavements £257,022.70






Sub Total (£) £828,153.83



£912,956.78

100 Preliminaries 15% £136,943.52



Works Total (£) £1,369,435.17




- Design Fee 10% £197,198.66

- Client costs 5% £98,599.33






Grand Total (£) £2,727,742.23

Notes:

Risk Allowance is apportioned based on average proportions of Sections A - D



Bill of Quantities: Feasability Study Section E


Date: Q3 2015 - 19/08/2015

Cost Summary



Edition)

