Patent ID: 6938691

Claim:
A portable groundwater sampling system for sampling a liquid below ground surface from a monitoring well, said sampling system comprising: a sampling tube having a first end in communication with said liquid below ground surface and a second end, a sampling tank having a sample inlet, a sample outlet and an pressure/vacuum port, an air pump having an inlet port and an exhaust port, a portable power supply for energizing said air pump, a air control valve having a first position for coupling said inlet port of said air pump to said pressure/vacuum port of said sampling tank to evacuate said sampling tank and a second position for coupling said exhaust port of said air pump to said pressure/vacuum port of sampling tank to pressurize said sampling tank, an inlet valve under operator control coupled to said second end of said sampling tube and said inlet of said sampling tank to control flow of said liquid from said monitoring well into said sampling tank, an inlet check valve inline with said inlet valve to prevent flow of liquid drawn into said sampling tube back into said monitoring well, and a pressure gauge for displaying the pressure or vacuum in said sampling tank, whereby when said air control valve is in said first position and said air pump is energized, said air pump evacuates said sampling tank until a predetermined vacuum is displayed on said pressure gauge, whereby said inlet valve may be opened by an operator to draw liquid from said monitoring well into said sampling tank.