A Guide to Soil Testing – When, Why, and How

Whatever sector you may be in, wherever soil is concerned you need to understand what’s beneath the surface. Housing developments, agriculture, construction, or just assessing environmental risks all rely on safe soil testing to get the information needed to make informed decisions, reduce risk, and make sure that projects can progress safely and efficiently.

Below we’ll explore when soil testing is needed, why it matters, and the different methods used to assess ground conditions.

Soil testing is needed so that soils can be analysed to understand whether land is suitable for what it intended. It can show a range of results including soil composition, levels of contamination, stability, drainage, and whether there are any hazardous materials present. The history of the site and the project’s needs will also play a part in those results.

Ground conditions can have a huge impact on the success of a project, its safety, and the overall cost. Without thorough soil investigations, issues could crop up which could cause delays, expense, and even structural problems in the future.

Soil testing helps to:

• Show any contamination from previous land use
• Show whether it’s suitable for construction or development
• Decide on foundation needs
• Support planning and regulations
• Calculate risks to the environment
• Show its suitability for drainage and infrastructure
• Lower project and financial risk

If you understand your site’s condition from the outset, you can make informed decisions whilst avoiding expensive surprises during construction or land use change.

The best time for soil testing is at the very early stages of planning a project. The sooner any problems or issues are found, the better. It’s easier and more cost effective to deal with issues at the earliest opportunity.

Soil testing is always recommended:

Before property development - Land development often needs investigations to find out soil stability, and to see if there are any contamination concerns. Your local authority might also request an assessment as part of the planning process.

For land redevelopment projects – Brownfield sites can often throw up problems because of previous industrial or commercial use. Soil testing will tell you if there is any contamination and whether remediation may be needed.

For agricultural and land management applications – Farmers and land managers use soil testing to find out about nutrient levels, soil health, and drainage. This information is helpful for land management and sustainability.

For environmental assessments – Environmental consultants often need soil tests to calculate pollution risks, or because of regulations, and to carry out their due diligence.

For construction projects – All kinds of construction (roads, utilities, foundations etc) rely on accurate testing to ensure efficient and safe design and construction.

There are different types of soil testing as different projects might not need the same level of testing as others. Testing services can include:

Contaminated land testing – This is where harmful substances can be found within soils, like heavy metals, hydrocarbons, asbestos, or industrial contaminants. Results will show whether remediation is needed, or further testing.

Geotechnical Investigation – This focuses on the engineering properties of the ground and assesses soil strength, bearing, settlement, and groundwater conditions which support foundation and structure design.

Soil Classification – testing the composition of soils helps show how the ground will behave under certain conditions. It shows soil types and their physical properties.

Environmental Soil Analysis – Environmental testing shows the impact contaminants could have on human health, groundwater, and ecosystems. It is used during planning applications and due diligence assessments.

Soil testing processes usually begin with a desk study, where historical maps, environmental records, and previous site information can be reviewed. This all helps identify if there could be any risks, and determines the direction of any site investigation.

Fieldwork may then be carried out using trial pits, boreholes, window sampling, or soil sampling. Samples collected on site are analysed in laboratories to show their properties.

Once testing has been done, a report can be put together. The details provided in the report include recommendations, concerns, and help inform future project decisions.

Soil testing needs technical expertise, industry knowledge, and current regulatory knowledge. Choosing an experienced specialist means that investigations are tailored to your project’s needs giving you results that are accurate and delivered clearly.

At Provectus, we provide a range of soil investigation, contaminated land assessment, geotechnical, and environmental testing services to support landowners, developers, and construction companies in all kinds of land projects. If you need specific advice on soil testing or potential soil contamination, including Asbestos or Hydrocarbons, please contact a member of our friendly team who will be happy to assist you.