A groundwater pollutant recovery system using the cone of depression approach, in which a sensing probe having liquid level sensors responsive to both water and pollutant levels and having attached to it the pollutant intake is deployed in a recovery well above the submerged water and pollutant pumps....http://www.google.fr/patents/US5099920?utm_source=gb-gplus-shareBrevet US5099920 - Small diameter dual pump pollutant recovery system
Small diameter dual pump pollutant recovery system
