Stantec selected for £129,200 Pontcysyllte site investigations

Stantec UK has been selected for a £129,200 environmental and ground investigation commission supporting Wrexham County Borough Council’s plans to develop permanent visitor parking for the Pontcysyllte Aqueduct and Canal World Heritage Site.

The appointment concerns a former chemical works warehouse site that the council is considering acquiring for the development. The consultancy will investigate land contamination, geotechnical conditions, ecology and drainage to establish the property’s constraints and potential liabilities before further investment decisions are taken.

The contract is divided into two stages. The initial stage will provide due diligence assessments supporting the proposed land acquisition, while a second stage would involve the appraisal of remediation options, preparation of a remediation strategy and validation during development and construction.

Progression to that second stage is conditional on the council successfully acquiring the property. The appointment does not establish that acquisition has been completed, that contaminated ground has been remediated or that construction of the car park is underway.

The contract has a reported value of £129,200 excluding VAT and is scheduled to run from 11 November 2026 to 31 March 2027. The value relates to consultancy and investigation services rather than the capital cost of the proposed visitor car park.

The project forms part of wider efforts to manage access to the Pontcysyllte Aqueduct and Canal World Heritage Site. The attraction includes the internationally recognised aqueduct and associated canal infrastructure, with visitor parking and local traffic management important considerations for the surrounding communities.

The proposed development would reuse land associated with historical chemical manufacturing. Former industrial sites can contain buried structures, demolition materials and substances remaining from previous processes, requiring careful assessment before their suitability for a new use can be established.

The wider Trevor Basin area has a substantial industrial history, including chemical production and earlier ironworking activity. Previous investigation work has examined risks associated with historical manufacturing operations, possible contamination in soils and groundwater, and the presence of shallow former coal workings.

These conditions influence how land can be prepared for redevelopment. A former industrial use may indicate potential hazards, but an environmental assessment must distinguish between historical activities, substances actually present and the pathways through which they could affect people or the environment.

The initial investigation stage will address land contamination using information about the site’s previous use, existing records and the findings of appropriate physical investigations. The results can help establish whether further sampling, risk assessment or remedial treatment is required.

A contaminated land assessment generally considers potential sources, exposure pathways and receptors. Substances in soil or groundwater are not automatically an unacceptable risk simply because they are present; their significance depends on concentration, mobility, location and the proposed use of the land.

Converting industrial land into a public car park changes the intended occupation and physical arrangement of the site. Areas used by pedestrians, vehicles and maintenance workers may have different exposure characteristics from those associated with the property’s earlier operations.

The proposed scheme may involve removing or modifying existing hardstanding, introducing drainage infrastructure and preparing new pavement surfaces. Each activity can expose underlying ground, requiring the development team to understand how materials should be handled and whether protective or remedial measures are needed.

Geotechnical assessment will examine the conditions relevant to supporting the proposed infrastructure. The characteristics of natural soil, rock and made ground affect settlement, excavation stability and the construction of pavements, retaining elements or other supporting structures.

Historical industrial development can leave buried foundations, service ducts and other obstructions. Their location and condition may influence the proposed layout and the construction methods required to prepare the site for new use.

Former shallow mining activity presents an additional consideration in parts of the wider area. Abandoned workings can create ground stability risks where voids or disturbed strata remain beneath development land, although the extent and condition of any workings affecting the proposed property must be established through appropriate evidence.

Investigation findings will help determine whether the intended car park can be constructed using conventional ground preparation or whether particular areas require further engineering assessment. Potential responses to unsuitable conditions could include changes to the layout, ground improvement or different pavement construction arrangements.

Drainage is included in Stantec’s initial scope because a new car park can alter the amount and rate of surface water runoff. Hard surfaces generally produce different drainage behaviour from vegetated or permeable land, making the treatment and discharge of rainfall an important part of the design.

The presence of potentially contaminated ground can also influence drainage options. Where infiltrating water could mobilise contaminants, a drainage strategy may need to avoid particular infiltration arrangements or incorporate measures to prevent water reaching affected materials.

The appropriate solution will depend on the site’s actual ground and environmental conditions. The contract does not identify a final drainage system, specify the number of proposed parking spaces or establish an approved remediation design.

Ecological assessment forms another part of the investigation. Former industrial land can develop vegetation and habitats during periods of disuse, while redevelopment may affect features requiring survey, protection or mitigation.

The ecological findings will help determine whether the proposed works need to accommodate protected species, retained habitats or construction timing constraints. Any necessary measures must follow the conditions identified at the site and the relevant statutory requirements.

The wider visitor parking proposals have already been subject to planning and development work, including investigations around Trevor Basin and the former industrial land. The Stantec appointment represents a further defined consultancy stage rather than the first consideration of car parking in the area.

Earlier work by IGE Consulting examined the ground and environmental constraints associated with the wider Trevor Basin development. Its investigations addressed the industrial history, potential contamination and ground stability, providing information for the project’s development and mitigation planning.

Stantec’s commission has a separately specified scope and contractual purpose. The earlier investigations do not establish that the council has already acquired the particular property covered by the current appointment, nor do they remove the need for the additional due diligence now being commissioned.

The Pontcysyllte Aqueduct itself is part of a World Heritage property recognised for its contribution to canal and civil engineering development. The proposed visitor parking infrastructure must be considered within the wider requirements of site access, surrounding land use and protection of the heritage landscape.

If the acquisition proceeds, the conditional second stage will allow Stantec to examine remediation options and prepare a strategy addressing the conditions established by the investigations. That strategy would identify the treatment or management measures appropriate to the proposed development and their verification requirements.

Remediation validation provides evidence that completed treatment or construction measures correspond with the approved strategy. Depending on the measures selected, it can involve inspection, testing, records of excavated or imported materials and confirmation that specified protective arrangements have been installed.

Stantec provides contaminated land, environmental assessment, geotechnical engineering and redevelopment services across the UK. Its wider project portfolio includes remediation of former industrial land where contamination and buried infrastructure have affected subsequent construction.

The Wrexham commission will establish the technical and environmental evidence needed for the council’s acquisition and delivery decisions. Construction of the permanent car park and any remediation works remain dependent on those findings, the property’s acquisition and subsequent project approvals.