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Llwyneinion Acid Tar Lagoon - Tar Characterisation Works
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Descriptions
Llwyneinion Acid Tar Lagoon is a former clay pit and brick works situated in the village of Rhosllannerchrugog near Wrexham in North Wales. The lagoon comprises approximately 94,000 tonnes of acid tar to a maximum depth of approximately 10 metres and occupying an area of 1.3 hectares. Water to a depth of 0.5 - 1.0 metres generally covers the acid tar. In addition 365 individual drums and drum clusters have been identified in the lagoon. The individual drums appear to be present at approximately 2.0 metres below surface level whilst the drum clusters may extend to the base of the lagoon. There is also approximately 7,500 tonnes of Fullers Earth to the immediate north west of the lagoon.Some investigations involving the removal of acid tar have been carried out over the years but due to access difficulties samples have only ever been taken at approximately 1-2m depth near to the edge of the lagoon. More recently the site has been investigated by Environment Agency Wales as a potential 'Special Site' as described in the Contaminated Land (Wales) Regulations 2006. However at present it is considered that the site does not meet the legal definition of contaminated land.Wrexham County Borough Council, as owners of the site, propose a detailed investigation of the acid tar and Fullers Earth, which will be split into four stages as follows:Stage 1: Detailed design of the works, giving consideration to site topography and access difficulties, ecological issues and health and safety of both site operatives and nearby residents; to be undertaken in conjunction with Wrexham County Borough Council.Stage 2: Intrusive investigation involving removal of acid tar samples from various locations within the lagoon and removal of Fullers Earth samples. Sampling shall extend as far as is reasonably practicable through full depth of material. Any site clearance and/or accommodation works necessary ahead of investigation works are included in this stage. Stage 3: Laboratory analysis and testing of material samples to enable a thorough review of suitable remediation techniques to be assessed.Stage 4: Production of a detailed remediation options appraisal.Additional Information:(a) Mineshafts: Nine mineshafts are recorded in the vicinity of the site of which three are situated below the lagoon. The condition of these shafts before disposal of the acid tar began is unknown and there are no records to suggest that they have been capped.(b) Ecology: The area around the lagoon is dominated by woodland. An ecological appraisal has revealed evidence of badgers, whilst the area contains habitat that could potentially support bats, Great Crested Newt, reptiles and breeding birds.
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Tender Regions
CPV Codes
71310000 - Consultative engineering and construction services
71900000 - Laboratory services
45100000 - Site preparation work
71621000 - Technical analysis or consultancy services
90713000 - Environmental issues consultancy services
71313000 - Environmental engineering consultancy services
71510000 - Site-investigation services
45111200 - Site preparation and clearance work
45120000 - Test drilling and boring work
Keywords
land clearing
system review
foundation prep
site readiness
core drilling
design auditing
demolition prep
land preparation
site cleanup
earthworks
ground clearing
soil testing lab
site clearance
excavation
site grading
site leveling
performance optimization
groundwork services
site preparation work
eco-strategy consultancy
soil mechanics testing
engineering consultancy
project consultancy
subsurface testing
terrain behavior study
sample preparation
vegetation removal
surface preparation
construction advisory
geotechnical analysis
risk assessment advisory
environmental drilling
chemical testing lab
vegetation clearing
feasibility diagnostics
sustainability advice
ground test drilling
preparatory works
exploratory boring
geotechnical drilling
quality assurance lab
bedrock profiling
technical consultancy
borehole drilling
engineering evaluation
test method validation
microbiological analysis
infrastructure advisory
stratigraphic sampling
process modelling
geochemical analysis
exploratory drilling
demolition clearance
procedural enhancement
topsoil stripping
stability testing
calibration laboratory services
environmental risk consultancy
environmental impact consulting
groundwater condition evaluation
preliminary site diagnostics
technical feasibility study
waste management consultancy
construction soil risk evaluation
laboratory soil classification
construction engineering guidance
regulatory compliance services
environmental policy support
environmental planning engineering
environmental impact advisory
environmental systems design
technical project planning
build feasibility consulting
civil construction consulting
water treatment engineering
contaminant level surveys
nature preservation consultancy
pollution control consulting
green business consultancy
engineering strategy services
groundwater table analysis
structural planning advisory
environmental lab testing
environmental consultancy
materials characterization
ecological expert services
site investigation drilling
green infrastructure consulting
sustainability engineering
foundation feasibility testing
test drilling and boring work
ecological risk assessment
environmental borelogging
ecological engineering advisory
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