Full Service Direct Imaging

Stock Drilling Inc., is proud to provide: LIF, MIP, MIHPT, EC, and HPT Direct Imaging Services.

UVOST by Dakota Technologies.

Dakota's UVOST® product efficiently delineates petroleum, oil, and lubricant (POL) contaminants in the subsurface. All the usual forms of POLs, including; gasoline, diesel fuel, jet fuel, and hydraulic fluids, can be detected via the fluorescence response of their polycyclic aromatic hydrocarbon (PAH) constituents. The fluorescence signal scales proportionally with NAPL concentration. (UVOST struggles to detect high-PAH content NAPLs such as tars, bunkers, etc.)

UVOST's LIF technique, in conjunction with direct push deployment, yields a detailed three-dimensional map of the NAPL distribution, in real time - offering a true "seek and find" adaptive site characterization capability as promoted by U.S. EPA's TRIAD approach.

Major Benefits to UVOST
• Typical detection limit of 10-500 ppm (NAPL type and soil dependent)
• Operates effectively above and below the saturated zone
• Fast! – probe advances at ~0.8 inch/sec without pause
• Typical daily productivity of 300-500 feet across 10-20 locations
• One inch data density coupled with nearly instantaneous response provides continuous detailed log of product distribution and heterogeneity
• Color-coded logs for the ultimate in qualitative information "at-a-glance"
• Waveforms offer product identification/verification and rejection of non-contaminant fluorescence such as mineral, peat, and other minor interferents
• Advanced UVOST® data analysis service from Dakota harvests waveform information to allow custom analyte isolation and/or interference rejection in the logs
• CPT and percussion (Geoprobe/PowerProbe) deliverable – if direct push sampling gets there, UVOST® can get there

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Electrical Conductivity (EC)

Electrical Conductivity (EC) instrument, a complimentary module for UVOST. Different soil types will conduct electricity differently depending on particle size and mineralogy. For example, clays generally will have high conductivity while gravels will have low conductivity. By logging EC with Dakota’s optical screening tools, you can develop a site wide model of source pollution and unconsolidated stratigraphy, two key components to predicting mobility.

The EC system operates at the same time OST data is being gathered. To collect EC data at the same time as OST data you need an EC module, a downhole dipole threaded below an EC capable SPOC, and a special fiber cable with EC wires.

EC logs are used to define zones of lower conductivity, equivalent to coarser grained, more permeable sediments, which will allow the movement of contaminants (hydrocarbons, chlorinated VOCs, or metals) in the subsurface. The lithologic information gathered with the Conductivity System can be used to aid the investigator in understanding the movement and location of contaminants in the subsurface. This information will also assist in the proper placement of monitoring or extraction wells.

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Optical Screening Tool Data Acquisition
& Display Software (OST)

The Optical Screening Tool Data Acquisition & Display Software (OST) was developed by Dakota to be an intuitive and powerful tool for the collection and manipulation of data from our optical screening tools. Built for use on a Windows operating system, the software handles all communication with our instruments. The user is able interface with the data, including generating log images and advanced batch processes.


ost optical screening tool

Membrane Interface Probe (MIP)

The MIP (membrane interface probe) is a direct push tool used to log the relative concentration of volatile organic compounds (VOCs) with depth in soil.

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The new probe detects volatile contaminants with the MIP, measures soil electrical conductivity with a standard (MIP) dipole array, and measures HPT injection pressure using the same down-hole transducer as the Geoprobe® stand-alone HPT system. In post-processing the log data with Geoprobe® DI Viewer software, the user is able to estimate hydraulic conductivity (K) and water table elevation, as well as prepare graphical outputs of the log data.


ost optical screening tool

Hydraulic Profiling Tool (HPT)

• The Hydraulic Profiling Tool (HPT) allows the user to create fast, continuous real-time profiles of soil hydraulic properties in both fine- and coarse-grained material. The HPT uses a sensitive, downhole transducer to measure the pressure response of the soil to injection of water. One primary use of this tool is to locate and define preferential migration pathways for contaminants in the subsurface. It can also be used to target zones for injection of remediation material. In addition, the HPT can be used to select well screen intervals, evaluate locations to conduct slug tests, and measure static water conditions across a site.

• Fast, continuous, real-time profiling of soil hydraulic properties
Use in both fine- and coarse-grained material
• Use in both saturated and unsaturated conditions
• Built to withstand percussion driving
• Collects static water level data
• Provides a simultaneous log of electrical conductivity with integrated Wenner array
• Sensitive, downhole transducer measures pressure response of soil to injection of water
• Parameters are displayed and stored on the field instrument for future analysis

Direct Image Viewer 1.4

DI Viewer is the display log software from Geoprobe Systems®, which can display and print EC, MIP, HPT, and CPT logs as well as MIP response and HPT dissipations & static water level data. This release adds support for the new log format used by the FI6000


ost optical screening tool

Field Instrument Geoprobe® Direct Image® FI6000
Data Acquisition System

The FI6000 connects directly via a USB connection to a field laptop running Geoprobe®-DI Logging software for viewing, saving, and transmitting Direct Image® logs. This combination yields an extremely reliable and easily operated data acquisition system. Pre and Post log self-test features built into the logging software make it easy for the operator to know the system is functioning properly. Test results are automatically saved in the log file.

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