What is dual tube soil sampling?
Dual tube sampling gets it name from the fact that two sets of rods are used to collect soil cores. The outer rods receive the driving force from the Geoprobe machine and provide a sealed hole from which soil samples may be recovered without the threat of cross contamination or cave-in. The second set of rods are placed in the outer rods and hold a sampler in place as the outer rod is driven the sample interval. The inner rods are then retracted to retrieve the soil core.
