Process and apparatus for obtaining samples of liquid and gas from soil

摘要: An apparatus and process for obtaining samples of liquid gas from subsurface soil is provided having filter zone adjacent an external expander ring. The ring creates a void within the substrate which encourages accumulation soil-borne fluids. fluids migrate along pressure gradient through plurality filters before entering first chamber. A one-way valve regulates flow fluid into second chamber in further communication with collection tube are collected at surface. reverse provides additional between chambers pressurized cleaning back-flushing apparatus.