Ebbw Vale Presentation 2015

Reclamation of the

Former Steelworks Ebbw Vale

Presentation by

Clive Williams and Raymond J Kenny

Former Steelworks Ebbw Vale

• The Site

• Constraints

• Site History

• Mining

• Contamination

• Mine Entries

• River Culvert

• Basements

• Reclamation

• The Works

Location Location

Key Areas of Constraint

• Ground Conditions including mining and contamination

• Drainage including ground and surface water

• Basements and Tunnels

• Walls, slopes and ground levels

• Existing infrastructure, including highways and services

• Landscape/Biodiversity

Former Steelworks Ebbw Vale

Site History

Past uses include:

• Steel/Ironworks

• Plating/galvanising works

• Coal Mining

• Gas works

• Coking Ovens

• Rail sidings

• Stores

• Offices

Mining Setting

• Lower Pentre

• Soap coal seam (Eighteen Inch)

• Black Pins/Coronation Coal (Gorllwyn Rider)

• Black Pins Mine Ground (Ironstone) (Cefn Coed Marine Band)

• Two Feet Nine

• Elled coal seam (Upper Four Feet)

• Big Vein coal seam (Lower Four Feet)

• Threequarter coal seam (Upper Six Feet)

• Gough’s Mine Ironstone

• Black coal seam (Upper Nine Feet)

• Upper Meadow Vein or Upper Engine coal seam (Yard)

• Gwar y Cae coal seam (Seven Feet)

• Old coal seam (Five Feet /Gellideg)

• Spotted Vein Ironstone

• Red Vein Ironstone

Shallow Mine Workings

Contamination

• Site investigation has identified a series

of contamination ‘hot spots’ throughout

the site.

• In particular these relate to elevated

metals and hydrocarbon contamination.

Contamination

Contamination

Coke Works Coke Works

Benzol plant Gas Works – Central Valley

Contamination

Tar Filled pipes Grease Filled pipes

Pools of Hydrocarbon

contamination on Till Northern Gas Works

Bioremediation

• Hydrocarbon contamination of

the soils was subject to

bioremediation

• Contaminated soils were

transported to the Hot Mill site

• Soils screened

Bioremediation

• Biopile formed

• Soil mixed with compost and

fertiliser

• Windrows covered

Biopile RE8

0

10

20

30

40

50

60

Sta

rtin

g C

onc.

Week 3

3

Week 3

5

Week 3

7

Week 3

9

Week 4

1

Week 4

3

Temp ('C)

Napthalene (mg/kg)

Benzo(a)pyrene

(mg/kg)

Dibenzo(a,h)anthrace

ne (mg/kg)

Napthalene site limit

(mg/kg)

Benzo(a)pyrene site

limit (mg/kg)

Dibenzo(a,h)anthrace

ne site limit (mg/kg)

Bioremediation

Mine Entries

• On basis of The Coal Authority and

initial investigations 5 mine adits

and 14 mine shafts are recorded at the

site

No 22 Pit

No 19 Pit

No 15 Pit House No 4 Pumping Pit House

Mine Entry Treatment

No 19 Pit Investigations

No 22 Pit

Mine Entry Treatment

No 19 Pit Investigations

River Ebbw Culvert

Basements

0 1 2 3 4 5 6

Basement Complexes

3.1-4.5

4.6-6.0

6.1-7.5

7.6-9.0

Ra

ng

e

Basement Depths (m)

Basements

Basements

Basements

Slab Demolition

Plateaux Creation

Soil Forming

Reclamation 2007/08

Reclamation 2008

Reclamation 2008

Reclamation 2008/09

Reclamation 2008

Reclamation 2008

The Works

Thank You