appendix 1: cost summary drawing, no. 14737/102/sk002

High Wycombe Town Centre Masterplan Infrastructure Cost Estimate - DRAFT

11 J:\14737 - High Wycombe Town\102 Costings\WP\Reports\R01 Cost Estimate - DRAFT.doc

Appendix 1: Cost summary drawing, no. 14737/102/SK002



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Scheme A: £3,750,000 Sainsburys / Dovecote Includes Oxford Road roundabout replaced with signalised T junction and closure of Arch Way Option 2 - Arch Way retained single carriageway £3,200,000

Scheme B: £1,400,000 Bridge Street / Westbourne Street Includes new signals at West Wycombe Road Option 2 - modified Bridge Street £1,300,000 Option 3 - modified Bridge Street £1,300,000

Scheme H: £200,000 Desborough Road Widening road between Bridge Street (Scheme B) and new Gas Works link road (Scheme C)

Scheme C: £600,000 Gas Works Includes new connection from Queen Alexandra Road to Desborough Road Option 2 - cul-de-sac instead of link £500,000

Scheme G: £200,000 Queen Alexandra Road Widening road between new Gas Works link road (Scheme C) and Abbey Way Gyratory (Scheme E)

Scheme F: £3,200,000 Abbey Way Flyover Partial demolition of flyover and creation of open space Option 2 - full demolition, new single carriageway £ 5,000,000 Option 3 - single carriageway on flyover £300,000 Option 4 - bus interchange on flyover £2,800,000

Scheme D: £2,650,000 Lilys Walk Alternative Includes new connection from Queen Alexandra Road to Desborough Road as alternative to Schemes C and G. Option 2 - single carriageway £2,200,000

Scheme I: £650,000 Queen Victoria Road / Easton Street Reconfiguration of junctions Option 2 - reconfigure signals & widen road £500,000 Option 3 - bus priority measures £400,000

Scheme E: £1,550,000 Abbey Way Gyratory Includes new signals at Marlow Hill and Abbey Way Option 2 - reconfigured signal arrangement £1,600,000 Option 3 - widened Queen Victoria Rd Bridge £1,900,000

INFORMATION

HIGH WYCOMBE TOWN CENTRE MASTERPLAN

INFRASTRUCTURE COST ESTIMATE

SCHEME COSTS

14737/102/SK002



Appendix 2: Breakdown of cost estimates and OPI data

The following pages contain a breakdown of costs for each of the schemes, and three charts illustrating how the future OPI value was built-up / determined. Chart 1 identifies two past trends in the OPI value, Chart 2 illustrates possible early and late recovery of OPI values, and Chart 3 identifies two scenarios for future OPI values.

High Wycombe MasterplanInfrastructure Cost Estimate

Series Description Quantity Unit Rate Total200 Site Clearance

General site clearance 3.6 ha 3,200.00£ 11,520.00£ Take up/down kerbing 2600 m 7.00£ 18,200.00£ Take up/down traffic signs 1 item 20,000.00£ 20,000.00£ Take up/down signals 1 item 25,000.00£ 25,000.00£ Take up/down street lighting 1 item 15,000.00£ 15,000.00£ Demolition of structure 1 item 400,000.00£ 400,000.00£

400 Road Restraint SystemsSafety barriers 0 m 40.00£ -£ Safety barrier terminal 0 nr 1,300.00£ -£ Pedestrian guardrails 100 m 300.00£ 30,000.00£

500 Drainage and service ductsPipes 1500 m 75.00£ 112,500.00£ Manhole 30 nr 1,500.00£ 45,000.00£ Gully 120 nr 600.00£ 72,000.00£

600 EarthworksExcavate soft material 2400 m3 14.00£ 33,600.00£ Excavate hard material (paving) 2600 m3 30.00£ 78,000.00£ Disposal of materials 5000 m3 29.00£ 145,000.00£ Import material 0 m3 31.00£ -£ Perforation of redundant carriageway 0 m2 4.00£ -£ Topsoil and grass seed 250 m2 4.00£ 1,000.00£

700 PavementCapping layer - 600mm 1400 m2 13.00£ 18,200.00£ Sub-base - 150mm 1400 m2 7.00£ 9,800.00£ Base 4800 m2 40.00£ 192,000.00£ Binder course 4800 m2 15.00£ 72,000.00£ Surface course 8700 m2 8.00£ 69,600.00£ Cold milling / planing of carriageway 4900 m2 7.00£ 34,300.00£ Regulating 4900 m2 12.00£ 58,800.00£ High friction / coloured surfacing 5000 m2 12.00£ 60,000.00£

1100 Kerbs, Footways & Paved AreasKerbs 2500 m 28.00£ 70,000.00£ Footway 7000 m2 25.00£ 175,000.00£ Block paving 0 m2 30.00£ -£

1200 Traffic Signs & Road MarkingsTraffic signs 1 item 40,000.00£ 40,000.00£ Road markings 1 item 5,000.00£ 5,000.00£ Traffic signals - small 1 nr 30,000.00£ 30,000.00£ Traffic signals - medium 4 nr 80,000.00£ 320,000.00£ Traffic signals - large 1 nr 120,000.00£ 120,000.00£ Street furniture allowance 1 item 5,000.00£ 5,000.00£

1300 Road Lighting ColumnsRoad lighting 1 item 140,000.00£ 140,000.00£

2500 StructuresStructure 0 item -£ -£

3000 LandscapingGeneral landscape reinstatement 1 item 175,000.00£ 175,000.00£ Sub-total 2,601,520.00£ Preliminaries incl traffic management 25 % 650,380.00£ Minor items (incl. surveys etc) 10 % 260,152.00£ Contingency 10 % 260,152.00£

TOTAL 3,750,000.00£

Notes Scheme:1. Civil engineering costs based on 2008 tender

costs2. No allowance has been made for professional,

building, planning, adoption and other such fees and VAT

3. Costs exclude any significant site clearance, site preparation, earthworks, and anomalies

4. Costs exclude utility diversion and protection works.

5. Costs based on relatively level ground and no extraordinary constraints

SCHEME A: SAINSBURYS / DOVECOTE - Option 1

J:\14737 - High Wycombe Town\102 Costings\Cost Estimate



General site clearance 3.6 ha 3,200.00£ 11,520.00£ Take up/down kerbing 2600 m 7.00£ 18,200.00£ Take up/down traffic signs 1 item 20,000.00£ 20,000.00£ Take up/down signals 1 item 25,000.00£ 25,000.00£ Take up/down street lighting 1 item 15,000.00£ 15,000.00£ Demolition of structure 0 item -£ -£



600 EarthworksExcavate soft material 2400 m3 14.00£ 33,600.00£ Excavate hard material (paving) 2400 m3 30.00£ 72,000.00£ Disposal of materials 4800 m3 29.00£ 139,200.00£ Import material 0 m3 31.00£ -£ Perforation of redundant carriageway 0 m2 4.00£ -£ Topsoil and grass seed 250 m2 4.00£ 1,000.00£



1200 Traffic Signs & Road MarkingsTraffic signs 1 item 40,000.00£ 40,000.00£ Road markings 1 item 5,000.00£ 5,000.00£ Traffic signals - small 2 nr 30,000.00£ 60,000.00£ Traffic signals - medium 4 nr 80,000.00£ 320,000.00£ Traffic signals - large 1 nr 120,000.00£ 120,000.00£ Street furniture allowance 1 item 5,000.00£ 5,000.00£




TOTAL 3,300,000.00£







SCHEME A: SAINSBURYS / DOVECOTE - Option 2





400 Road Restraint SystemsSafety barriers 0 m 40.00£ -£ Safety barrier terminal 0 nr 1,300.00£ -£ Pedestrian guardrails 0 m 300.00£ -£


600 EarthworksExcavate soft material 350 m3 14.00£ 4,900.00£ Excavate hard material (paving) 1700 m3 30.00£ 51,000.00£ Disposal of materials 2050 m3 29.00£ 59,450.00£ Import material 0 m3 31.00£ -£ Perforation of redundant carriageway 0 m2 4.00£ -£ Topsoil and grass seed 0 m2 4.00£ -£



1200 Traffic Signs & Road MarkingsTraffic signs 1 item 15,000.00£ 15,000.00£ Road markings 1 item 2,000.00£ 2,000.00£ Traffic signals - small 0 nr 30,000.00£ -£ Traffic signals - medium 3 nr 80,000.00£ 240,000.00£ Traffic signals - large 1 nr 120,000.00£ 120,000.00£ Street furniture allowance 1 item 2,000.00£ 2,000.00£



3000 LandscapingGeneral landscape reinstatement 1 item 10,000.00£ 10,000.00£ Sub-total 955,390.00£ Preliminaries incl traffic management 25 % 238,847.50£ Minor items (incl. surveys etc) 10 % 95,539.00£ Contingency 10 % 95,539.00£

TOTAL 1,400,000.00£







SCHEME B: BRIDGE STREET / WESTBOURNE STREET - Option 1














TOTAL 1,400,000.00£











General site clearance 0.5 ha 3,200.00£ 1,600.00£ Take up/down kerbing 300 m 7.00£ 2,100.00£ Take up/down traffic signs 1 item 1,000.00£ 1,000.00£ Take up/down signals 0 item -£ -£ Take up/down street lighting 1 item 1,000.00£ 1,000.00£ Demolition of structure 0 item -£ -£






1200 Traffic Signs & Road MarkingsTraffic signs 1 item 2,000.00£ 2,000.00£ Road markings 1 item 1,500.00£ 1,500.00£ Traffic signals - small 0 nr 30,000.00£ -£ Traffic signals - medium 0 nr 80,000.00£ -£ Traffic signals - large 0 nr 120,000.00£ -£ Street furniture allowance 1 item 1,000.00£ 1,000.00£




TOTAL 600,000.00£







SCHEME C: GAS WORKS - Option 1







600 EarthworksExcavate soft material 0 m3 14.00£ -£ Excavate hard material (paving) 1700 m3 30.00£ 51,000.00£ Disposal of materials 1700 m3 29.00£ 49,300.00£ Import material 0 m3 31.00£ -£ Perforation of redundant carriageway 0 m2 4.00£ -£ Topsoil and grass seed 0 m2 4.00£ -£

700 PavementCapping layer - 600mm 1000 m2 13.00£ 13,000.00£ Sub-base - 150mm 1000 m2 7.00£ 7,000.00£ Base 1000 m2 40.00£ 40,000.00£ Binder course 1000 m2 15.00£ 15,000.00£ Surface course 1500 m2 8.00£ 12,000.00£ Cold milling / planing of carriageway 500 m2 7.00£ 3,500.00£ Regulating 500 m2 12.00£ 6,000.00£ High friction / coloured surfacing 0 m2 12.00£ -£


1200 Traffic Signs & Road MarkingsTraffic signs 1 item 2,000.00£ 2,000.00£ Road markings 1 item 1,500.00£ 1,500.00£ Traffic signals - small 0 nr 30,000.00£ -£ Traffic signals - medium 0 nr 80,000.00£ -£ Traffic signals - large 0 nr 120,000.00£ -£ Street furniture allowance 1 item 500.00£ 500.00£




TOTAL 450,000.00£







SCHEME C: GAS WORKS - Option 2














TOTAL 2,650,000.00£







SCHEME D: LILYS WALK ALTERNATIVE - Option 1














TOTAL 2,250,000.00£







SCHEME D: LILYS WALK ALTERNATIVE - Option 2





400 Road Restraint SystemsSafety barriers 60 m 40.00£ 2,400.00£ Safety barrier terminal 2 nr 1,300.00£ 2,600.00£ Pedestrian guardrails 50 m 300.00£ 15,000.00£





1200 Traffic Signs & Road MarkingsTraffic signs 1 item 20,000.00£ 20,000.00£ Road markings 1 item 2,500.00£ 2,500.00£ Traffic signals - small 2 nr 30,000.00£ 60,000.00£ Traffic signals - medium 2 nr 80,000.00£ 160,000.00£ Traffic signals - large 0 nr 120,000.00£ -£ Street furniture allowance 1 item 5,000.00£ 5,000.00£




TOTAL 1,550,000.00£







SCHEME E: ABBEY WAY GYRATORY - Option 1














TOTAL 1,550,000.00£



















2500 StructuresStructure 1 item 260,000.00£ 260,000.00£


TOTAL 1,900,000.00£











General site clearance 0.8 ha 3,200.00£ 2,560.00£ Take up/down kerbing 0 m 7.00£ -£ Take up/down traffic signs 1 item 2,000.00£ 2,000.00£ Take up/down signals 0 item -£ -£ Take up/down street lighting 1 item 6,000.00£ 6,000.00£ Demolition of structure 1 item 1,750,000.00£ 1,750,000.00£




700 PavementCapping layer - 600mm 0 m2 13.00£ -£ Sub-base - 150mm 0 m2 7.00£ -£ Base 0 m2 40.00£ -£ Binder course 0 m2 15.00£ -£ Surface course 0 m2 8.00£ -£ Cold milling / planing of carriageway 0 m2 7.00£ -£ Regulating 0 m2 12.00£ -£ High friction / coloured surfacing 0 m2 12.00£ -£

1100 Kerbs, Footways & Paved AreasKerbs 0 m 28.00£ -£ Footway 4000 m2 25.00£ 100,000.00£ Block paving 0 m2 30.00£ -£

1200 Traffic Signs & Road MarkingsTraffic signs 0 item -£ -£ Road markings 0 item 1,500.00£ -£ Traffic signals - small 0 nr 30,000.00£ -£ Traffic signals - medium 0 nr 80,000.00£ -£ Traffic signals - large 0 nr 120,000.00£ -£ Street furniture allowance 1 item 10,000.00£ 10,000.00£




TOTAL 3,200,000.00£







SCHEME F: ABBEY WAY FLYOVER - Option 1




General site clearance 0.8 ha 3,200.00£ 2,560.00£ Take up/down kerbing 0 m 7.00£ -£ Take up/down traffic signs 1 item 2,000.00£ 2,000.00£ Take up/down signals 0 item -£ -£ Take up/down street lighting 1 item 6,000.00£ 6,000.00£ Demolition of structure 1 item 2,500,000.00£ 2,500,000.00£




700 PavementCapping layer - 600mm 3000 m2 13.00£ 39,000.00£ Sub-base - 150mm 3000 m2 7.00£ 21,000.00£ Base 3000 m2 40.00£ 120,000.00£ Binder course 3000 m2 15.00£ 45,000.00£ Surface course 3000 m2 8.00£ 24,000.00£ Cold milling / planing of carriageway 0 m2 7.00£ -£ Regulating 0 m2 12.00£ -£ High friction / coloured surfacing 1200 m2 12.00£ 14,400.00£


1200 Traffic Signs & Road MarkingsTraffic signs 1 item 5,000.00£ 5,000.00£ Road markings 1 item 1,500.00£ 1,500.00£ Traffic signals - small 3 nr 30,000.00£ 90,000.00£ Traffic signals - medium 0 nr 80,000.00£ -£ Traffic signals - large 0 nr 120,000.00£ -£ Street furniture allowance 1 item 5,000.00£ 5,000.00£




TOTAL 4,950,000.00£











General site clearance 0.8 ha 3,200.00£ 2,560.00£ Take up/down kerbing 800 m 7.00£ 5,600.00£ Take up/down traffic signs 1 item 2,000.00£ 2,000.00£ Take up/down signals 0 item -£ -£ Take up/down street lighting 0 item -£ -£ Demolition of structure 0 item -£ -£




700 PavementCapping layer - 600mm 0 m2 13.00£ -£ Sub-base - 150mm 0 m2 7.00£ -£ Base 0 m2 40.00£ -£ Binder course 0 m2 15.00£ -£ Surface course 500 m2 8.00£ 4,000.00£ Cold milling / planing of carriageway 500 m2 7.00£ 3,500.00£ Regulating 500 m2 12.00£ 6,000.00£ High friction / coloured surfacing 300 m2 12.00£ 3,600.00£



1300 Road Lighting ColumnsRoad lighting 0 item -£ -£



TOTAL 300,000.00£















700 PavementCapping layer - 600mm 0 m2 13.00£ -£ Sub-base - 150mm 0 m2 7.00£ -£ Base 800 m2 40.00£ 32,000.00£ Binder course 800 m2 15.00£ 12,000.00£ Surface course 1300 m2 8.00£ 10,400.00£ Cold milling / planing of carriageway 500 m2 7.00£ 3,500.00£ Regulating 500 m2 12.00£ 6,000.00£ High friction / coloured surfacing 600 m2 12.00£ 7,200.00£




2500 StructuresStructure - 3no. lifts 1 item 1,050,000.00£ 1,050,000.00£


TOTAL 2,750,000.00£















700 PavementCapping layer - 600mm 0 m2 13.00£ -£ Sub-base - 150mm 0 m2 7.00£ -£ Base 230 m2 40.00£ 9,200.00£ Binder course 230 m2 15.00£ 3,450.00£ Surface course 230 m2 8.00£ 1,840.00£ Cold milling / planing of carriageway 0 m2 7.00£ -£ Regulating 0 m2 12.00£ -£ High friction / coloured surfacing 600 m2 12.00£ 7,200.00£






TOTAL 200,000.00£







SCHEME G: QUEEN ALEXANDRA ROAD




General site clearance 0.3 ha 3,200.00£ 960.00£ Take up/down kerbing 100 m 7.00£ 700.00£ Take up/down traffic signs 1 item 1,000.00£ 1,000.00£ Take up/down signals 1 item 3,000.00£ 3,000.00£ Take up/down street lighting 1 item 1,500.00£ 1,500.00£ Demolition of structure 0 item -£ -£




700 PavementCapping layer - 600mm 0 m2 13.00£ -£ Sub-base - 150mm 0 m2 7.00£ -£ Base 240 m2 40.00£ 9,600.00£ Binder course 240 m2 15.00£ 3,600.00£ Surface course 1240 m2 8.00£ 9,920.00£ Cold milling / planing of carriageway 1000 m2 7.00£ 7,000.00£ Regulating 1000 m2 12.00£ 12,000.00£ High friction / coloured surfacing 300 m2 12.00£ 3,600.00£






TOTAL 200,000.00£







SCHEME H: DESBOROUGH ROAD







600 EarthworksExcavate soft material 100 m3 14.00£ 1,400.00£ Excavate hard material (paving) 300 m3 30.00£ 9,000.00£ Disposal of materials 300 m3 29.00£ 8,700.00£ Import material 0 m3 31.00£ -£ Perforation of redundant carriageway 40 m2 4.00£ 160.00£ Topsoil and grass seed 40 m2 4.00£ 160.00£



1200 Traffic Signs & Road MarkingsTraffic signs 1 item 25,000.00£ 25,000.00£ Road markings 1 item 3,000.00£ 3,000.00£ Traffic signals - small 1 nr 30,000.00£ 30,000.00£ Traffic signals - medium 0 nr 80,000.00£ -£ Traffic signals - large 2 nr 120,000.00£ 240,000.00£ Street furniture allowance 1 item 5,000.00£ 5,000.00£




TOTAL 650,000.00£







SCHEME I: QUEEN VICTORIA / EASTON STREET - Option 1














TOTAL 750,000.00£





















TOTAL 700,000.00£











Chart 1 - Past and Present OPI

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Chart 2 - Past, Present and Predicted OPI to 2010

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Chart 3 - Past, Present and Predicted OPI to 2012

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OPI = 177

OPI = 163



Appendix 3: Additional drawings

Please note that the following drawings have been reduced to A4 size and are not full size copies.



Appendix 4: Reports on structures

The following are reports on the existing structures involved in the cost estimate.

J:\14737 - High Wycombe Town\102 Costings\Abbey Way - Technical Note.doc Page 1 of 2

Job Name: High Wycombe Masterplan Job No.: 14737 Note No.: 1 Date: 30/01/09 Subject: Abbey Way - Elevated Highway Prepared By: iPw The Abbey Way Elevated Highway is a 24 span structure constructed from inverted precast prestressed concrete T beams supporting a reinforced concrete deck slab. Each span is 11.28m long supported on reinforced concrete crossheads carried by three vertical columns. The structure possesses short “solid” ramp approaches flanked with reinforced concrete retaining walls giving an overall length of approximately 350m. The structure carries a dual carriageway through the area to the south west of the town centre and contains a bifurcated section with a short spur road to the west linking to Desborough Road. The Octagon shopping arcade exists beneath the elevated highway towards its western end for approximately 125m of its length. There are numerous retail and commercial properties in extremely close proximity to the elevated highway (approximately 4.0m) over the majority of its length. No details of the viaduct articulation or its substructure below ground level were available at the time of this report. Two concrete box culverts run beneath the highway and the shopping complex along the same alignment as the highway, straddling the central pier columns for the western part of the structure. Three options are being considered by Wycombe Borough Council for the future of the Abbey Way Elevated Highway. Option 1 Demolition of elevated section but retaining the shops beneath the structure. Option 2 Demolition of elevated section and installation of an at grade single carriageway road. Option 3 No demolition (structure to be used by buses only) Demolition of the existing elevated highway structure and approach embankments is assumed to be by conventional means (i.e. the use of machine mounted hydraulic breakers and sawing methods). The presence of precast prestressed concrete beams will necessitate the removal of large beam sections from site prior to breaking up. Other structural components could be reduced to manageable sizes on site for subsequent removal truck. The presence of two box culverts beneath the highway is likely to complicate the demolition process as measures will need to taken to ensure that they are not damaged by falling materials, vibrations or loading from demolition plant. The buried depth of the culverts is unknown at the time of this reports preparation. Conventional demolition methods are potentially very noisy and dusty, it is assumed that mitigation measures will be implemented as an integral part of the demolition process. The entire area to be demolished is assumed to be securely fenced off.

Peter Brett Associates LLP

Caversham Bridge House

Waterman Place, Reading

Berkshire RG1 8DN

DD: +44 (0)118 950 0761

T: +44 (0)118 950 0761

F: +44 (0)118 959 7498

E: [email protected]

Website: www.pba.co.uk

J:\14737 - High Wycombe Town\102 Costings\Abbey Way - Technical Note.doc Page 2 of 2

Option 1 Demolition of elevated section (retaining shops beneath the structure if possible). It is possible to demolish the existing elevated highway structure and remove it from site however the retention of the shops within the Octagon Shopping Centre may complicate sections of the demolition. (It is assumed that units beneath the structure not within the Octagon Centre will not be retained). The elevated highway forms the roof structure of the Octagon Shopping Centre and therefore the section of highway above the shops must be retained if they are to remain. Caution should be taken when undertaking the removal of part of a structure in order not to damage the retained section. Remedial works to the retained section may be necessary to ensure that it behaves in the correct structural manner and exposed broken sections will need to be made good to prevent deterioration over time. It may be necessary for retail units within the Octagon Shopping Centre to be closed to the public for short periods during demolition of the elevated highway adjacent to it. Estimated cost for partial demolition = £1,750,000

Option 2 Demolition of elevated section and installation of an at grade single carriageway

road. Estimated cost for full demolition = £2,500,000 The above figure excludes costs for construction of the at grade single carriageway road.

Option 3 No demolition (structure to be used by buses only)

This option requires no structural input and has therefore not been costed.

Notes All of the above costs are approximate estimates and exclude the following items:

Loss of Trade to neighbouring businesses Traffic management Services diversions Reinstatement Presence of hazardous substances (eg. Asbestos) if any Structural survey Legal fees Approval Processes Etc.

The above costs assume that all substructures are reduced to 300mm below existing ground levels and removal of demolition debris.

appendix 1: cost summary drawing, no. 14737/102/sk002

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