DPP uses both macro core and dual tube sampling systems to obtain continuous soil cores or discrete soil samples at specified depths.
The Macro-Core MC5 soil sampler is suited to collecting large volumes of soil cores of unconsolidated materials at shallow depths.
DPP has a strong preference on most jobs for the dual tube system (DT-32) that allows continuous, discrete soil sampling from a cased probe hole. This eliminates the threat of material falling into the borehole and provides a far greater level of sample integrity than obtained by hollow stem augers and at a much faster, more cost effective rate.
DT-32 soil samples are contained within a 50mm diameter clear liner that can be sealed for subsequent offsite analysis. Alternatively half the casing can be removed for on site sampling and logging.
Dual tube sampling 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 that receives the driving force from the Geoprobe hammer as well as providing a sealed hole from which soil samples can be recovered without cross contamination. The second, smaller set of rods are placed inside the outer casing to hold a sample liner in place as the outer casing is driven one sampling interval. The inner rods are then retracted to retrieve the filled liner.
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