Gas Holder Base Remediation - Southern England

Region: Southern England

Client: Calor Gas Involved Units: Eneotech Environmental Ltd

Execution Time: 3 weeks

Contract Value: £260,000+

Projektdaten

Gasholder Remediation

Holder base dewatering

Sludge removal

Material excavation and offsite disposal

Ausgeführte Arbeiten

Soil Remediation Services

Contaminated Soils and Groundwater

Project Data

Work Performed

Gasholder Remediation , Southern England

Eneotech Environmental were employed by Calor Gas

Properties Ltd. to undertake the remediation of a former

gasholder site under the supervision of MJCA (MJ Carter

Associates).

During decommissioning of the gasholder many years

ago, demolition waste was used to fill the deep void left

between the foundation walls. The demolition waste and

basal sludges infilling the annulus space had to be

excavated due to the level of contamination present. All

arisings were sent directly to landfill for disposal.

Eneotech used a pole excavator with a grab bucket to

remove the material from in between the gasholder

foundations. This specialist plant was required as the

standard back-acting excavator could not reach the full

depth of the excavation due to the radius on the

foundation walls. The pole excavator could drop vertically

in the annulus space reaching the base of the

foundations. Excavated material was then taken of site

to a hazardous waste landfill.

The open excavation was backfilled with imported

crushed concrete. Compaction was achieved during the

backfilling process by mechanical compaction using a

remote controlled tamden roller within the confined

space. To minimise the risk of collapse of the two

foundation walls material was backfilled into the spaces

immediately after the excavation.

In order to avoid re-contamination of the backfill

contaminated water was removed from the annulus using

a hydraulic pump. The use of this type of pump was due

to the potentially explosive atmosphere of the excavation

site. Contaminated water was passed through a

Eneotech owned treatment plant designed specifically for

the likely contaminants (dissolve methane, BTEX

solvents etc).

Eneotech Environmental Ltd. provides a wide range of

waste management techniques enabling the regeneration

and redevelopment of contaminated land. We offer a full

range of technologies including water treatment, sludge

handling and dewatering, soil washing, thermal

desorption, soil vapour extraction, air sparging,

bioremediation (windrow turning and ex situ static

methods), stabilisation and solidification.

Eneotech Environmental Ltd is backed by decades of

experience and interdisciplinary skills amassed by the

Eneotech group of companies.

Our company Eneotech Environmental Ltd. ranks as one

of the most highly skilled and dependable services

providers specialising in site rehabilitation, waste disposal

and service platform preparation.

Head Office Eneotech Environmental Ltd. 10 Station Road Chertsey Surrey KT16 8BE Tel: +44 (0)1932 577290 Fax: +44 (0)1932 571917 For more information email: info@eneotech.co.uk www.eneotech.co.uk

Northern Regional Office Eneotech Environmental Ltd. 7400 Daresbury Park Daresbury Warrington WA4 4BS Tel: +44 (0) 1928 737500 Fax: +44 (0) 1928 737699

Scotland Office Eneotech Environmental Ltd. Lochside House, 3 Lochside Way, Edinburgh EH12 9DT Tel: +44 (0)131 4522047 Fax: +44 (0)131 4522518 Fax: +44 (0)131 4522518