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Civil Engineering Contracting
The provision at environmental protection
Systems utilizing geomembranes is a rapidly developing market driven
by Government legislation and heightened awareness of our responsibilities
to protect the natural environment.
The design and installation of these environmental
protection systems is a highly specialised task requiring a comprehensive
understanding of the application requirements and geomembrane performance
characteristics, backed by high quality installation services and
a comprehensive guarantee.
Sarnafil International Founded in 1958 to focus on
polymer technology and engineering. Sarnafil International AG is
recognised as one of mainland's Europe's market leaders in the design
and manufacture of geomembrane systems for environmental protection,
tunnel lining, below grade waterproofing, swimming pool lining and
water storage applications.
Keynotes:
The Environment
Sarnafil as a manufacturer of plastic products Sarnafil
is conscious of its responsibility to the environment and has for
many years recycled its products. New factory waste is recycled
back into the production process or used to manufacture new products
such as the SarnaTred walkway tile. Old Sarnafil membranes that
have reached the end of their useful life are recycled back into
new products via the AfDR recycling centre in Troisdorf, Germany,
of which Sarnafil is a part owner.
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Primary Containment
Primary containment encompasses a diverse range of
applications where the geomembrane lining acts as the first and
often only containment/barrier. Applications range from the storage
of highly hazardous substances to untreated storm water including:
- Industrial wastewater lagoons
- Leaching ponds
- Process water storage
- Aquaculture ponds
- Sewage lagoons
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Secondary Containment
Secondary containment comprises the provision of
a barrier or container as additional protection to prevent leakage
and loss of contaminants in the event ot a failure of the primary
containment barrier - sometimes referred to as the twin-barrier
fail safe approach. Secondary containment is typically associated
with the petro-chemical, process engineering and power generation
industries where the potential effects of leakage of volatile substances
into the environment could prove catastrophic. Typical applications
include:
- Petro-chemical - Linings below petrol forecourts
and bund linings to fuel stores
- Process Engineering - Bund lining to chemical
vessels
- Power Industry - Linings beneath transformers
at electrical substations
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Sustainable Drainage Systems and the Permavoid System
Sustainable drainage Systems or SuDS are physical
structures built to receive and manage surface water runoff. Located
as close as possible to where the rain falls they provide source
control solutions by infiltration (where appropriate) or attenuation
by utilising such techniques as modular geocellular underground
structures encapsulated in a geomembrane.
In response to the increasing demand for a complete
Sustainable Drainage Solution from one supplier, Sarnafil have developed
a fully integrated SuDS system comprising TG68 geomembrane, Type
M geotextile and the Sarnafil Permavoid System drainage box units.
Offering a number of unique features, and requiring as little as
150mm of surface cover, the system exceeds all new construction
and limited discharge consent applications and has the added benefit
of being suitable for use on a retrofit basis. Multi-functional
applications:
- Attenuation, Infiltration, Deep attenuation tanks,
Virtual curtains.
- Standard 150mm depth, increased capacity as required
by application.
- 92% volumetric void space.
- Maximum crush strength of 900 kN/m2 per unit,
in excess of 1400 kN/m2 under block paving.
- Fully validated flow rates of between 9 and 21
l/s/m for a single layer.
- Minimal excavation required.
- Can be joined to form a structural raft.
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Contaminated Land
A fundamental problem exists in the UK - the conflict
between the sustained demand for land development coinciding with
the rapidly diminishing availability of greenfield sites. Combine
this with the Government's ongoing policy of encouraging public
and private sector investment into the development of brownfield
Sites, and you guarantee that the redevelopment of contaminated
land will continue to increase to satisfy this demand.
The primary considerations for the selection criteria for a gas
resistant geomembrane under a structure are survivability and buildability
rather than its theoretical 'p' value. The ability of a gas resistant
geomembrane to withstand damage during placement and installation
is largely determined by the material properties, in particular
tensile strength, puncture I abrasion resistance, tear resistance
and UV resistance.
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Cut-off Trenches
Recent environmental legislation and design guidance
within the landfill and contaminated land sectors have heightened
the awareness of liability issues concerning the control of hazardous
liquid and gaseous pollutants. Two fundamental principles have evolved
(i) the polluter pays and (ii) the land purchaser takes responsibility
for pollution - the so called "buyer beware" philosophy.
Composite barriers are also commonly used to prevent contaminant
migration, where a slurry trench cut off wall is excavated and a
geomembrane is inserted into the wall.
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Steep Slope Engineering
When lining or capping a landfill the client
is usually attempting to maximise the fill volume by
increasing the angle of the side slopes (above or below ground),
minimising the 'land-take' required to achieve stability. Significant
commercial benefits arise from this concept which can provide large
increases in volume, particularly when increasing the slope angle
up to 35 degrees. The range of engineering issues governing the
installation of geomembrane linings to steep slopes and faces include:
- The angle at which the underlying soils will
remain stable
- Interface friction angle of barrier materials
with underlying soils
- How to anchor the barrier material
- Tensile forces introduced to barrier material
due to movement and settlement
- Interface friction angle between barrier material
and overlying waste or cover media
- Effect on friction at all interfaces by water
- Resistance of barrier material to contaminants
- Design life
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Floating Covers
Floating covers are designed to encapsulate a liquid
or semi liquid substance, either protecting the content from external
pollutants or the environment from the content. In addition to these
protection applications the cover can provide thermal and ultra
violet light insulation, gas containment, odour control and create
an anaerobic environment.
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