B+ G will guide you and help you define your spoil management concept according to the laws in your country.
In Switzerland, excavated materials are legally spoken waste, since they are not exploitated for the intended purpose (USG Art.7-6).
Moreover, the pollutor is responsible for the waste disposal which "...includes its recovery or deposit in a landfill as well as the preliminary stages of collection, transport, storage and treatment. “Treatment” is any physical, chemical or biological modification of the waste." (USG Art.7-6bis).
Finally, the production of waste should be avoided wherever possible and certain
types of waste have to be recovered if " this is economically feasible
and harms the environment less than other forms of disposal and the manufacture of new products." (USG Art. 30d).
In any cases, the client has to test different recovery possibilities for his excavated materials.
A spoil management concept has to be formulated in accordance to the following laws, ordinances and guidelines (since english is not one of the federal languages, the titles are given in german):