Groundwater sampling device

A groundwater sampling device adapted to be submerged into groundwater within a well and for pumping a portion of the groundwater from the well, comprising:

• a hollow cylindrical tubular outer housing having a bottom and an open upper end thereof, said bottom having a plurality of water inlet ports formed therethrough;
• a hollow cylindrical tubular inner housing having a bottom and an open upper end thereof, said inner housing sized to be positioned coaxially within said outer housing and defining a substantially cylindrical water flow passage therebetween, said bottom of said inner housing spaced from said bottom of said outer housing to define a lower portion of said water passage whereby said inlet port is in fluid communication with said water flow passage;
• an electric motor positioned within said inner housing, an output shaft of said motor downwardly extending through a sealed hole in said bottom of said inner housing;
• a water impeller connected to a lower end of said output shaft and operably positioned between said bottoms to cause water in the well to be drawn inwardly through said inlet port into and upwardly through said water flow passage;
• a motor module cap sealingly removably engaged at said open upper end of said inner housing, said motor module cap having aperture means for sealingly positioning electrical conduit passing longitudinally therethrough in contact with electrical input terminals of said motor;
• an output cap sealingly removably engaged at said open end of said outer housing, said output cap having aperture means for sealingly passing the electrical conduit longitudinally therethrough and also having a water outlet port, said output cap also being connected in spaced relation to and above said motor module cap to form an upper portion of said water flow passage whereby water from the well is discharged upwardly through said outlet port, the water passing upwardly through said water flow passage providing cooling for said motor;
• said motor module cap also longitudinally positioning and supporting said inner housing to define said lower portion of said water flow passage.

A groundwater sampling system for withdrawing groundwater from a well comprising:

• a sampling device comprising:
• a hollow cylindrical tubular outer housing having a bottom and an open upper end thereof, said bottom having a water inlet port formed therethrough;
• a hollow cylindrical tubular inner housing having a bottom and an open upper end thereof, said inner housing sized to be positioned coaxially within said outer housing and defining a substantially cylindrical water flow passage therebetween, said bottom of said inner housing spaced from said bottom of said outer housing to define a lower portion of said water passage whereby said inlet port is in fluid communication with said water flow passage;
• an electric motor positioned within said inner housing, an output shaft of said motor downwardly extending through a sealed hole in said bottom of said inner housing;
• a water impeller connected to a lower end of said output shaft and operably positioned between said bottoms to cause water in the well to be drawn inwardly through said inlet port into and upwardly through said water flow passage;
• a motor module cap sealingly removably engaged at said open upper end of said inner housing, said motor module cap having aperture means for sealingly positioning electrical conduit passing longitudinally therethrough in contact with electrical input terminals of said motor;
• an output cap sealingly removably engaged at said open end of said outer housing, said output cap having aperture means for sealingly passing the electrical conduit longitudinally therethrough and also having a water outlet port for discharging water from the well upwardly therefrom, the water passing upwardly through said water flow passage providing cooling for said motor;
• an electrical power controller operably connectable between a power source and said electrical conduit whereby voltage and electrical current delivered to said motor and thusly water pumped from the well is variable;
• a flexible outlet conduit operably connectable at one end thereof to said outlet port and at another end thereof to a water sample vial capable of holding a quantity of groundwater pumped from the well by said device.