| 摘要 |
An apparatus for driving a sampling pump disposed in a monitoring well comprises a structural support member including a container for pressurized gas; a platform having a top surface and supported by the structural member; an air compressor secured on the top surface and operably connected to the container; a venturi for generating a vacuum from the pressurized gas in the container; an engine for driving the air compressor; and a controller operably connected to the container, the generating means and the sampling pump for alternately directing compressed air and vacuum to the pump to thereby operate the pump.
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