1 Establishment of site security Chemical plant drain down & dismantling ->500 Tanks...

1

Establishment of site security

Chemical plant drain down & dismantling- >500 Tanks- >5000 Pipe Runs

Demolition

Site assessment and characterisation

Construction of a water treatment system

Creation of a18 ha nature reserve

Ecological mitigation

Treatment trials - Eurodemo

Detailed design and regulatory approvals

Full project review

Works To Date

2

04-12-01

TEMPL

.Y

SCALE

APPROVED

DATE

t.

JTS

Off Site Plant Area High Level Stocking Area

Waste Tip inc. Lagoon

2

River Rother and Flood Plain

NE

Water Table

Vapours

Direct Contact: Inhalation / ingestion

Aggressive attack on services / foundations

Leaching of contaminants migration into controlled waters

Wind blown particulates from exposed soils & during disturbance - onto third party land and general public

River RotherLagoon 2

DIAGRAMMATIC CONCEPTUAL MODEL

Metal Contamination

Organic Contamination

Inorganic Contamination

Leachables

Human Health

Structures / Services

Made Ground

Alluvium

Coal Measures

Legend

SW

Source

Pathway

Coal Measures

Groundwater Flow

3

• Complex project nature required early contractor

involvement to ensure the exact nature and cost

of the works were understood

• Bespoke Early Contractor Involvement contract

developed

Bringing a Delivery Expert Into the Team

Preferred contractor appointed May 2006 VSD Avenue – JV

• DEC• Volker Stevin• Sita Remediation

4

Avenue remediation options derived by partnership working.

Seven re-use criteria

Technologies used focus on contamination removal

Current remediation strategy submitted for planning in May 2007

Planning determined November 2007

Full project review 2008

Remediation technologies to be used

–Selective excavation–Complex sorting –Soil washing–Bio-remediation–Thermal desorption

Derivation of Remediation Options

5

River

Flood Relief Scheme

Nature Reserve

Residential Development

Sports Pitches

Option 3 - Full Site Clean-Up, Reclamation and Development

Delivery TimeMain works – 54 months

Anticipated Completion Date – April 2014

Outcomes and Outputs - Environmental liabilities met

- Landowner liabilities met

- Future development area created

- Sports/leisure facilities created

- Nature reserve created

- Landform fully improved

- Full flood relief scheme created

Cost - £172.3m

Lowest Risk Option