Westminster City Council King Street Low Carbon Trial - Client Report

BASELINE

There are no existing facts on carbon usage for highways within Westminster and there is scarce data across the industry to enable us to understand how much carbon is created on a standard footway scheme. To create a baseline carbon footprint of a standard scheme we identified a comparison site of a similar size and value. A PPM footway scheme on Marlborough Hill was selected as it had a value of £35,500 with the works predominantly ASP replacement (Figure 2 and 3). The results were evaluated and transferred to individual spreadsheets per scheme to calculate the carbon scores. A Supervisor Check Sheet was created to record all vehicle movements, deliveries, plant operations and welfare usage. The same site supervisor looked after both schemes and completed the sheets daily whilst each job was on site to ensure consistency To understand the difference in cost we compared the design estimate against the final turnout cost. However, a ‘like for like’ comparison was difficult because the current schedule of rates was built from plant, labour and material costs. As such, the costs were compared to the existing cost estimate for standard delivery.

COMPARISON BETWEEN KING STREET & MARLBOROUGH HILL

Figure 2 - Shows the differences between the two schemes.

Marlborough Hill

King St

Estimated Value

£35,500 306m2

£41,000 268m2

Paving (m2)

Kerb (m)

108m 32m2 61m3

124m 37m2 29m3

Kerb line Asphalt (m2) Excavation (m3) Excavator Model EV Charging Points

KUBOTA KX015-4

JCB 19C-1 Etec Excavator

N/A

2 x 22kv CityEV Chargers & FP Relocate 8no & reused 8 from other scheme WackerNeuson AP1850WE

Cycle Stands

N/A

Wacker Model

Belle PCLX320 STIHL TS410

Saw Model

Hasqvarna K535i

Welfare Unit Type Grab Lorry Fuel Type

Eco – With Diesel Generator

Eco – With Electric Connection

Diesel Diesel

HVO HVO

Delivery Vehicle Fuel Type No of Operatives on Site Operative Travel Type Supervisor Travel Type

3

3

Diesel Van, Public Transport

Electric Van, Public Transport

Diesel van

Electric van

11