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Dual Tube Soil Sample

Geoprobe® brand Dual Tube Sampling Systems are efficient methods of collecting continuous soil cores with the added benefit of casing in drilling. Our line of Dual Tube Soil Sampling Systems probe rods include: DT22DT325DT37DT45, and DT60.

Casing in Drilling

Dual tube sampling uses two sets of probe rods to collect continuous soil cores while also performing casing in drilling. One set of probe rods is driven into the ground as an outer casing. These probe 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 probe 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 probe rods are then retracted to retrieve the filled liner. Expendable cutting shoes are used when performing multiple tasks in the borehole such as monitoring well, soil vapor, and sparge installations.

Key Features

  • Continuous soil coring for faster sampling in intervals over 20-feet.
  • Continuous soil coring in both saturated and unsaturated zones.
  • Casing in drilling 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.
  • Install groundwater monitoring wells through outer casing after collection of soil core.
  • Set soil vapor implant wells after soil collection.

Tooling Links

2.25 in. Drive Cap

GH60, Threadless

MN: 206249

2.25 in. Drive Cap

GH40, Threadless

MN: 206187

DT22 Drive Cushion

MN: 212548

DT22 Drive Bumper

MN: 601006

DT22 Liner Drive Head

1.25 Pin

MN: 213916

DT22 Detent Drive Head

1.25 Pin

MN: 228499

DT22 Fishing Tool Head

1.25 Pin

MN: 209428

DT22 Liner (Core Catcher)

60 in., Quantity: 50

MN: 235306

DT22 Liner (Core Catcher)

48 in., Quantity: 50

MN: 235304

DT22 Liner (Core Catcher)

36 in., Quantity: 50

MN: 235305

DT22 Liner (No Core Catcher)

60 in., Quantity: 50

MN: 235338

DT22 Liner (No Core Catcher)

48 in., Quantity: 50

MN: 235340

DT22 Liner Cutter

MN: 205516

2.25 in. Probe Rod

60 in.

MN: 204767

2.25 in. Probe Rod

48 in.

MN: 204766

2.25 in. Probe Rod

36 in.

MN: 206706

2.25 in. Probe Rod

24 in.

MN: 206588

2.25 in. Probe Rod

12 in.

MN: 204777

DT22 Cutting Shoe

1.125 in. ID, 2.375 in. OD

MN: 204774

DT22 Drive Cap

1.25 in. Rod, Threadless

MN: 204236

DT22 Discrete Point

1.25 in. Pin

MN: 204237

O-Ring (DT22 Expendable Cutting Shoe)

Quantity: 50

MN: 213913

DT22 Rebuild Kit

For 213916 (DT22 Drive Head)

MN: 213915

DT22 Liner Drive Head Bolt

Quantity: 20

MN: 202221

DT22 Detent Drive Head Rebuild Kit

For 228499 (DT22 Detent Drive Head)

MN: 231158

DT22 Drive Cushion Assist Handle

For use with DT22 Drive Cushion

MN: 210804

DT22 Vinyl End Caps

50 Pair

MN: 213909

Hydraulic Extruder Plunger


MN: 205743