oil contamination and groundwater contamination frequently go hand-in-hand, but they are actually not the same issue nor do they require remediation in exactly the same way.
Soil Contamination
Soil contamination refers to the actual presence of contaminants in soil. This could be above ground (hence people, plants and animals can have contact) or beneath the surface in land or natural layers. These can range from fuel spills, historic industrial use (e.g. dry-cleaning facilities), waste disposal sites to asbestos-containing materials and heavy metals.
This is common when soil issues are revealed during site investigations for redevelopment and extensions or a garden/land is being converted. Given that soil is a solid, the remediation can be simple in some cases: dig it out and replace; cap it or stabilise, or treat on-site.
Groundwater Contamination
Groundwater contamination affects the water below ground or surface in soil and rock sediment, often used as a quicker source of drinkable water for humans to use. The reason groundwater is important is that it can move (off-site of a property), it might then spread contamination into rivers, lakes and drinking water supplies. For Groundwater Remediation, consider //soilfix.co.uk/services/groundwater-remediation
Typically, the data from groundwater issues are determined over time by using monitoring wells and sending samples back to a lab. Remediation is often a longer duration of pump-and-treat or bioremediation. It can be a tricky process as the water might be moving and therefore it is hard to clean-up.
Why the difference matters
So in layperson terms: the contamination of soil is frequently regional, a lot of, however not all groundwater pollution migrates. That’s what risk assessment gets at by locating the source, pathway or receptor for your unique situation.
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