Systems and methods for installation, design and operation of groundwater monitoring systems in boreholes
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United States of America Patent
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Feb 24, 2009
Grant Date -
Jan 11, 2007
app pub date -
Jul 8, 2005
filing date -
Jul 8, 2005
priority date (Note) -
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Abstract
Systems and methods for installation and operation of a groundwater monitoring system in a borehole of any angle using a coaxial gas displacement pump with a unique O-ring assembly that serves as a two-position valve for groundwater purging and sampling and also as a housing and sealing mechanism for isolating an optical pressure sensor. The optical sensor measures in-situ hydraulic pressure directly subjacent and adjacent to the surrounding rock fractures and sediment pores without hydraulic interferences from potentiometric equilibration lag time from recovery fluid pressure inside a borehole, in a zone above the optical sensor, or on the inside of a riser pipe that rises to the ground surface.
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