Page 19 - pipeline.pdf

Reinstatement of Agricultural Subsoils

All soil stabilisation techniques which use lime or cement as the basis for the stabilisation will leave the stabilised soils with an elevated pH
level and a lower moisture content than they previously had. The reinstatement of stabilised soils must therefore be approached from a
number of different angles depending on the end use of the land in question.

Where topsoil layers are relatively deep (>250mm) then the presence of reinstated stabilised materials under the topsoil layer may not
manifest itself in a negative way as plant roots source over 80% of their nutrients and water from within the more organic topsoils typically
within 300mm of the surface. With shallower topsoil depths it follows that the presence of any reinstated stabilised materials can have

more impact on the future surface crop growth.

Generally where there is not a specific agricultural or ecological need for full biological reinstatement the re-pulverisation of the stabilised
layers and the replacement of the topsoils will be sufficient. After pulverisation the stabilised materials have a granular texture which in
itself can offer benefits such as allowing better subsoil drainage as well as facilitating the penetration of oxygen to a deeper depth.