Our software then plots the wave amplitude versus time, and wave velocities are calculated. Our resistivity module, located behind the standard piezocone, consists of two electrodes separated by insulating material. A constant current is generated across the electrodes, while voltage changes are recorded during CPT penetration. The resistivity is calculated based on the change in measured voltage. The resistivity measurements are dependent on both soil structure and pore fluid.
Measurements are often useful in identifying the depth to groundwater and capillary fringe.
The UVIF module has a downhole high energy ultra violet light directed through a sapphire window into the soil and groundwater being penetrated. The ultra violet light causes fluorescence of hydrocarbons contained within the soil and groundwater. The fluorescence amplitude is returned to the surface thru a fiber optic cable. As the UVIF module defines the extent of the contaminant, the CPTU characterizes the ground in terms of soil type, soil permeability, soil strength and phreatic surface. At each test location an integrated vertical profile of relative contaminant concentration, soil stratigraphy and groundwater profile are generated in realtime on site.