Johnson Probing has the capability of collecting groundwater samples using several methods and types of tooling: Screen Point 15 & 16 Groundwater Samplers: The Screen Point 15 & 16 Samplers are devices consisting of a stainless steel screen inside of a sealed, steel sheath that is driven to a specified depth at which the screen is deployed for the collection of representative groundwater samples. The Screen Point sampler is driven into the ground using direct push technology and tooling. The assembled Screen Point 15 or 16 Sampler is attached to the leading end of a probe rod and advanced into the subsurface adding additional probe rods until the desired sampling interval is reached. The O-ring seals at each rod joint, the drive head, and the expendable drive point provide a watertight system, eliminating the infiltration of formation fluids to the screen prior to deployment. Upon deployment, up to 44 inches of screen can be exposed to the formation.
The ground water samples can then be collected fro...
The ground water samples can then be collected from the Screen Point Sampler using several common methods. Two of these methods utilize polyethylene or Teflon® tubing that is placed inside of the probe rods down through the deployed Screen Point. The first method uses a check valve assembly which is attached to one end of the tubing; water is pumped through the tubing and to the ground surface by oscillating the tubing up and down. The second method incorporates the use of a peristaltic pump attached to the tubing. This method is limited in that water can be pumped to the surface from a maximum depth of approximately 26 feet. An alternate technique for groundwater sampling is to use a mini-bailer. The mini-bailer is lowered down the inside of the casing below the water level where it fills with water and is then retrieved from the casing.
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