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Groundwater improvement
natural attenuation of any residual contamination
after primary treatment.
There are a number of groundwater improvement
schemes in the park to address specific contami-
A further scheme incorporating both a passive
nants. Methodologies adopted vary and use:
collector drain and shallow in-ground physical
barrier is also being considered, where perched
containment by physical (below ground)
water has been assessed to potentially impact
structures and groundwater control by pumping
upon the adjacent surface water course. The
abstraction of light and dense free-phase
Stadium and Aquatics sites have been delivered
hydrocarbons (NAPL)
three months early and groundworks continue,
treatment of abstracted water by filtration,
leading to completion of platforms for the remaining
air stripping, granular activated carbon and
venues. Bringing consultants, specialist contractors
micro-organisms
and regulators together at an early stage has
allowed this project to fulfill its objectives.
injection of slow and quick release oxidising
chemicals.
Summary
In addition to these remedial treatments, deep
The combination of a range of treatment
basement construction is also requiring localised
technologies has resulted in over 600,000m
3
of
groundwater control by deep sumps and well-
material to be processed in the last seven months,
point systems.
with around 60,000m
3
still to be processed in a
Containment, by installing a recirculating pump very sustainable and cost effective manner.
and reinjection system, has been designed to
The local community has been continuously
abstract shallow groundwater from the Terrace
engaged through a consultation, communication
Gravels and treat the abstracted water for
and engagement programme that has included
principally ammonia (seeding with Archaea
meetings, workshops, drop-in sessions, educa-
microbes) and hydrocarbons (through skimming
tional activities for young people, newsletters and
tanks and activated carbon filters). This is prior
a dedicated website to inform them of progress
to about a third of the water being locally re-
and to hear views and issues as they arise.
injected and the remainder disposed to combined
sewer.
The system will temporarily reverse the local
Budgets under pressure?
existing groundwater gradient that flows
Need dependable expert advisors?
For Independent Expert Advice and Innovative Low-Cost Solutions in
towards the adjacent river courses. Contain-
ment in the form of both sheet and concrete
• Remediation
• Risk Assessment
pile walls are used to control pathways and
• Environmental Due Diligence
enhance groundwater treatment and • Environmental Assessment
improvement.
• Permitting/Litigation
• Groundwater Resources
Both light and dense hydrocarbon skimming/
Contact:
abstraction systems are also being used for
Lawrence Houlden
the abstraction of both shallow and deep
Archon Environmental Consultants Ltd
Tel: 01223 840414
groundwaters. In some instances abstraction
lhoulden@archonenvironmental.com
ARCHON
is combined with secondary injection of
Cambridge-based specialist consultants with world-wide partner organisations
oxygen release compounds (ORC) to enhance
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