Establish What Is Actually There
Old plans, previous fuel invoices and installation records can help identify a tank when little is visible. Send the approximate location, any known dimensions or capacity and what it last held. State whether it is still connected to equipment, has stood unused or was reportedly decommissioned by a previous owner.
An unused fill pipe does not establish safety. Equally, a previous statement that a tank was filled needs supporting records. Avoid opening chambers, entering the vessel or digging around it to answer questions that require specialist investigation.
Partly buried storage also needs careful assessment. Give the extent of what is visible and whether any sides are covered by soil, a wall or later construction.
Removal Or Decommissioning In Place?
Excavation and removal can eliminate the remaining vessel and allow inspection of the ground it occupied. It also requires a safe digging method, a lifting route and reinstatement. A tank beneath a structure or close to foundations may present constraints that are not apparent from its surface cover.
Decommissioning in place can be considered where removal is impractical, but it is a designed closure method rather than simply covering the opening. Contents and residues must be addressed first. The filling material and procedure must suit the tank, location and future loading of the land above.
The Environment Agency's decommissioning guidance favours removal of tanks unlikely to be used again. It also calls for retained closure records. Filling an old tank does not treat contamination already outside it, so closure and environmental investigation must be considered separately.
Investigate A Suspected Historic Leak
Unexplained fuel loss, stained ground or an oily smell should be disclosed at the outset. A lack of visible staining at the surface does not rule out a buried release. Soil or groundwater assessment may need an environmental specialist working alongside the tank contractor.
Where investigation is needed, agree sampling locations, laboratory work and how findings will be reported. Any remediation proposal should be based on those findings and the planned use of the site. Do not assume removing the tank alone will provide evidence that the land is uncontaminated.
For a purchase or redevelopment, tell your surveyor, insurer or project adviser about the tank early. Their evidence requirements may affect the work package. A simple completion note may not answer the environmental questions attached to a lender's or developer's decision.
Plan The Groundwork And Access
The survey needs to consider services, foundations, retaining walls, ground conditions and the space for excavation equipment. Vehicle access and a safe lifting position must be confirmed before promising removal. A small visible cover does not describe the size of the work area needed below it.
In rural Essex, mention private drainage, wells, boreholes, streams and ditches near the proposed works. In estuary locations, describe known flooding and any soft or waterlogged ground. These observations help identify survey questions without assuming that every property in a district has the same conditions.
Ask what happens to paving, planted areas or a driveway after the work. Reinstatement should specify the intended finish and any limits, including temporary surfacing. Removing excavated spoil and importing suitable backfill can be separate cost items with their own classification and transport requirements.
Fuel, Sludge And Price Variables
The tank may still contain recoverable product even after years out of use. Water and sludge can also accumulate, making a surface gauge or old delivery record unreliable. Plan recovery and suitable storage or disposal before work exposes the tank.
Costs depend on depth, size, condition, remaining contents, access and the selected closure method. Surveys, environmental sampling, contaminated material handling and structural advice can add work beyond the tank itself. Ask which assumptions are provisional and what findings would trigger a revised scope.
Make The Closure Traceable
Retain the tank's position, approximate capacity, former contents, closure date and method. Where the tank remains, keep the details of the filling material and the contractor's completion record. Where it is removed, retain removal and waste records together with any photographs supplied as evidence.
Add sampling reports and any remediation results when relevant. Future owners and project teams need to distinguish a cleaned and filled vessel from one that was merely abandoned. Use the enquiry form to explain whether the immediate need is a survey, a sale-related record review or a fully scoped closure project.
Questions About Underground Tanks
Does Filling A Buried Tank Remove Pollution?
Filling a buried oil tank does not remove pollution that has already reached soil or groundwater. It addresses the vessel itself after proper preparation.
If leakage is suspected, environmental investigation and any necessary remediation need their own scope, evidence and records. Tell us about stains, smells or historic fuel losses when you enquire.
Can A Tank Beneath A Driveway Be Dealt With?
An underground tank beneath a driveway needs assessment of access, depth, surrounding services and the loads the surface must carry afterwards. Removal may be possible, while closure in place may be considered where excavation is impractical. Ask for the final surface condition and retained records to be specified alongside the tank work.