They burn all the trees and grasses for clean and fresh soil.

Other areas would be capped with clean soil or other materials.

According to Nausicaä, plants that grow in clean soil and water are not toxic.

Half an hour later she had cleared a respectable breathing-space of rich clean soil around the plants.

You should place a barrier membrane on top of the material and fill the hole with clean soil.

This was covered by 60 cm of clean soil (Slattery, 1963).

Three to eight feet of clean soil was also added.

We cover it with a foot of clean soil.

Before landscaping the waste tip was covered with a 6m layer of clean top soil.

It was fully closed five years later and overlaid with two feet of clean soil.