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The
Geoprobe® DT21 Groundwater Profiler is three tools in one! The DT21
Groundwater Profiler allows you to retrieve soil samples, collect groundwater
samples, and perform slug testing... at multiple depth intervals... in
one probe push. This lets you conduct detailed vertical profiles of groundwater
contaminants with ease, or determine vertical and lateral variations in
hydraulic conductivity to define preferential contaminant flow paths and
optimize remedial system design. The screen interval may be developed
with the tubing check valve, and samples can be collected with the pneumatic
bladder pump. The screen system of the DT21 profiler is excellent for
hydraulic conductivity (slug) testing. The DT21 profiler is also great
for sampling at multiple depths and at deeper depths.
This groundwater sampling system is designed around the DT22 Dual Tube Sampling System. This system may be used to conduct soil sampling, groundwater sampling, and slug testing at multiple depth intervals in one probe hole. The dual tube rods are advanced to depth either by soil sampling or with the solid drive point installed. The inner (1.0 inch) rods and solid drive point (or soil sample) are removed so the screen may be installed. Extension rods equipped with an insert tool are used to lower and hold the screen in position at the base of the cutting shoe. The rod grip handle is then used to retract the outer (2.25 inch) rods as the screen is held in position with the extension rods. As the rods are retracted, the 0.75 in. Schedule 40 x 12 in. long, 10-slot PVC screen is exposed to the formation. The screen head seats against the reduced ID of the cutting shoe and O-rings provide a seal. The screen interval may be developed with the tubing check valve and samples can be collected with a bladder pump if desired. Slug test have been sucessfully performed with this system in formation with hydraulic conductivity over 750 ft/day. An adapter is available to isolate the screen from the ID of the 2.25 in. rods with 0.5 inch PVC riser pipe. This option is useful for collecting high-integrity samples or conducting slug tests in lower hydraulic conductivity formations. Bottom-up tremie grouting should be conducted after profiling is completed (screen removed) with an acceptable grout mixture.
DT21 Groundwater Profiler Advantages:
The DT22 Soil Sampling System uses Geoprobe® 2.25 in. (57 mm) OD probe rods as an outer casing and Geoprobe® 1.0 in. (25 mm) OD rods for the inner rod string. [