Geoprobe® brand Dual Tube Sampling Systems are efficient methods of collecting continuous soil cores with the added benefit of a cased hole. Dual tube sampling uses two sets of probe rods to collect continuous soil cores. One set of rods is driven into the ground as an outer casing. These rods receive the driving force from the hammer and provide a sealed hole from which soil samples may be recovered without the threat of cross contamination. The second, smaller set of rods are placed inside the outer casing. The smaller rods hold a sample liner in place as the outer casing is driven one sampling interval. The small rods are then retracted to retrieve the filled liner.

Geoprobe® Dual Tube Sampling Benefits Include:

• Continuous coring for faster sampling in intervals over 20-feet.
• Continuous coring in both saturated and unsaturated zones.
• Cased hole eliminates cross contamination.
• Optional solid drive tip seals system for driving to top of sampling interval or for split interval sampling.
• Perform bottom-up pressure grouting while retracting outer casing.
• Set monitoring wells through outer casing after collection of soil core.
• Expendable cutting shoes available.

Geoprobe® Systems offers two Dual Tube systems:

DT325 Sampling System
For use with 3.25-inch probe rods.