Groundwater Profiler

The Geoprobe® Groundwater Profiler enables your field operator to conduct vertical profiling of groundwater quality from a discrete interval using 6 in. or 12 in. (152 or 305 mm) screens. Profiling can be conducted to determine vertical distribution of contaminants, especially in sandy or coarser grained aquifers, as the tool is advanced incrementally into the formation. There's no need to retract the Profiler after each sample is collected. Purging water through the Profiler with a peristaltic pump as it is advanced minimized clogging of the screen.

The Profiler allows the user to not only obtain high integrity, discrete interval samples over a depth profile, but also lets the user conduct hydraulic conductivity tests at each sampling depth (i.e. slug tests) to determine the most probable contaminant flow paths.

Rather than small "port holes" that may be prone to clogging, the larger screen area of this tool provides a much greater surface area for the flow of groundwater into the system. This tool is 1.375 in. (35 mm) in diameter and can be telescoped through Geoprobe's 2.25-in. (57 mm) probe rods. Development of the screen can also be conducted at each sampling depth to lower turbidity when required. Bottom up (positive pressure) grouting can be conducted when an expendable point is used.

Groundwater Profiler individual parts, expendable points, and O-rings may be purchased separately as needed. Complete kits are available with either a 6 in. or 12 in. screen interval and either a solid or expendable drive point option. See the Geoprobe® Tools Catalog for complete details or speak with a Customer Service Representative.

Groundwater Profiler Advantages:

Sample at multiple depth intervals without removing/reinstalling the sampler for each depth.
Inner ported rod provides strength so it can be driven under GH40 series hammer.
Stainless steel screen has a 0.004 in. slot to assist with development and to provide high-quality samples.
Inexpensive tubing and a tubing adapter can be used to isolate the sampled water from stagnant water inside the drive rods thus improving sample quality.
Water may be added to the tool string as it is advanced to minimize the potential for clogging the screen with fines.
When properly developed, slug tests may be conducted at each depth interval to determine formation transmissivity and to locate preferential migration pathways.
Bottom-up pressure grouting may be conducted to meet abandonment requirements.

Since the drive head of the Profiler has an adequate ID, a tubing bottom check valve can be lowered into the screen area allowing for flow development. The Profiler comes with two Tubing Adapters and a package of O-rings.

Initially Electrical Conductivity (EC) logs or soil sampling should be completed prior to using the Groundwater Profiler to define site lithology and to determine appropriate depths for retrieving water samples. This minimizes the possibility of fine-grained materials clogging the screen.