Context description : technology technologies technique process used remediation sanitation in-situ on-site off-site bioremediation landfarming stripping soil vapour extraction excavation ion-exchange oil seperator catalytic oxidation active carbon adsorption skimmer environment environmental techn technics technician INTERGEO Intergeo groundwater site investigation geolog geology geologist geologists geological hydrogeolog hydrogeology hydrogeologist hydrogeologists hydrogeological consult consulting consultant consultants company companies ground analysis analytic analytical assessment impact study studies hydrocarbons sludge heavy metals drilling