Decommissioning Methodology

1

At construction, samples are taken of both virgin and enhanced soil. A UKAS laboratory assesses soil properties and undertakes testing to formulate the required composition of reagent.

Contaminated Land
Contaminated Land

2

A meeting is arranged with the main contractor and/or the landowner/land agent to discuss and agree the exact seed or crop that is to be sown upon completion of works.

3

The surface stone is stripped and relocated. Often this is donated to the landowner or main contractor for reuse or recycled by traditional methods.

Contaminated Land
Contaminated Land

4

The stabilised subbase is broken up using a tractor pulled subsoiler or an excavator with a ripper tooth.

5

The site-specific blend of reagent is mixed with subbase material using a Stehr dust free mixer. The addition rate of reagent is controlled through an on-board computer system.

Contaminated Land
Contaminated Land

6

Topsoil preserved from the initial construction phase is spread evenly across the area of reinstatement.

7

A power harrow is employed to condition the topsoil to a healthy tilth ready for seeding.

Contaminated Land
Contaminated Land

8

If seasonally opportune grasses are replanted or the area is handed back to the owner to plant crops at their convenience.

Grass
Landowner Comfort

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HS2
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