A soil mixing apparatus for mixing soil and a media. The apparatus comprises a housing having a rotatable auger mounted longitudinally within the housing. The housing is provided with a first lower end, an intermediate section and a second raised end, the second raised end raised relative to said first lower end. A hopper is coupled to the first lower end of the housing so that the rotatable auger extends into the hopper for moving the soil toward the second raised end. A valve apparatus is coupled to the housing at the intermediate section of the housing for introducing the media to the soil as the soil is moved from the hopper to the second raised end. The rotatable auger is provided with a series of spaced flites so that the soil can be moved from the first lower end through the intermediate section and to the second raised end. An inlet water supply allows water to be introduced at the intermediate section. A treatment inlet supply allows an additive to be added to the soil at the intermediate section.