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Ground
(Source: NEN 5707)
Solid part of the earth containing liquid and gaseous components and organisms.

Soil
(Source: Dutch decree on soil quality)
Solid material composed of mineral parts with a maximum grain size of 2 millimetre, organic substance in a proportion that is normally found in the ground and with a structure naturally occurring structure, as well as naturally present shells and gravel with a grain size of 2 up to 63 mm.

Groundwater
(Source: Dutch Framework Directive water)
All the water that can be found under the soil surface in the saturated zone, that is directly in contact with the soil or underground.

Sludge
(Source: an official definition of sludge does not exist. In the accreditation scheme of the Dutch AS3000, the definition of dredging mud is used, as in the Dutch decree on soil quality)
Material, released through surface water or for that water intended space, existing from mineral parts with a maximum grain size of 2 millimetre and organic substance in a proportion that is normally found in the ground and with a structure naturally occurring structure, as well as naturally present shells and gravel with a grain size of 2 up to 63 mm.

Bitumen
(Source: NEN 7331)
Very viscous liquid or solid material, existing mainly of hydrocarbons or derivatives thereof, that is almost completely soluble in Carbon disulfide.

Asphalt
(Source: NEN 7331)
Natural or artificial mix of bitumen and mineral matter.

Waste water
(Source: ISO 6107-1)
Water that is drained after it has been used or has been formed during a process and that is no longer necessary in that process.

Air
(Source: Energy and environment information system VITO, Belgium)
Mixture of a number of gases and substances, with a constant composition, created by natural processes, with as main gases oxygen (20.9 %) and nitrogen (78.1 %).

Building material
(Source: Dutch decree on soil quality)
Material in which the total content of silicium, calcium or aluminium represents more than 10% of the total weight of the said material, with the exception of glass, aluminium, soil or sludge.

Asbestos
(Source: NEN5707)
mineralogical name which describes certain fiber silicates that belongs to the mineralogical group of the serpentin and amphibole minerals, which have crystallised in the so-called asbestiform and as a result, are easily fissile to long, thin, flexible strong fibers when they are grinded or processed.