Wis. Admin. Code NR § 746.03
Wis. Admin. Code Department of Natural Resources § NR 746.03
Because the term "discharge" has been interpreted by the Wisconsin supreme court to include the migration of hazardous substance contamination after it is released to the environment, the term "site" includes all areas to which petroleum product contamination has migrated, including areas not on the source property. The term "site" and "source property" are not synonymous. A "site" can be larger or smaller than a "source property." The term "site" is synonymous with the term "occurrence" as that term is used in ch. NR 747. The term "site" is used here in order to establish common terminology that will be used by both the department of safety and professional services and the department of natural resources in the implementation of ch. NR 746.
Section NR 700.03(58) defines "soil" to mean "unsaturated organic material, derived from vegetation and unsaturated, loose, incoherent rock material, of any origin, that rests on bedrock other than foundry sand, debris and any industrial waste."