What are the site preparation requirements for building in Wales?

"(1) T he ground to be covered by the building shall be reasonably free from any material that might damage the building or affect its stability, including vegetable matter, topsoil and pre-existing foundations." [1] "(2) R easonable precautions shall be taken to avoid danger to health and safety caused by contaminants on or in the ground covered, or to be covered by the building and any land associated with the building." [1] "(3) A dequate sub-soil drainage shall be provided if it is needed to avoid: (a) t he passage of ground moisture to the interior of the building; (b) d amage to the building, including damage through the transport of water-borne contaminants to the foundations of the building." [1] "making reasonable provisions to secure the health and safety of persons in and about the building, and by safeguarding them and buildings against adverse effects of: (a) u nsuitable material including vegetable matter, topsoil and pre-existing foundations;" [3] "Site investigation is now recommended as the method for determining how much unsuitable material should be removed." [4] "Remedial measures for dealing with land affected by contaminants have been expanded to include biological, chemical and physical treatment processes." [4]

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