Geophysical Measurements

The quality of groundwater is highly variable and groundwater contamination may be caused by man-made or natural sources. Integration of borehole-geophysics logging with water-quality sampling provides a more complete picture, whether the objective is to develop a water-supply well or remediate a contaminated aquifer.

Wells are the access points to the groundwater system, and knowledge of their construction and condition are important whether they are being used for groundwater supply, monitoring, or remediation. The location and condition of casing and screen can be rapidly evaluated with geophysical logging.

Geotech offers instruments and software for recording and analyzing measurements of the geophysical properties of wells and boreholes.

Gamma Ray Logging System
Geotech Gamma Ray Logging System

Gamma logs record the amount of natural gamma radiation emitted by the rocks surrounding boreholes.

Gamma logs, also called gamma-ray logs or natural-gamma logs, are the most widely used nuclear logs in groundwater applications. Common uses are identification of lithology and for stratigraphic correlation.

The Geotech Gamma Ray Logging System is used in exploration for uranium, potash and base metals as well as for petroleum and groundwater. The system identifies lithologies and stratigraphic correlations in boreholes, cased or uncased, liquid or air filled. For petroleum and groundwater exploration, the system provides information on the sequence of rocks in the borehole, and it can also be used to locate nonradioactive substances such as coal.

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Geotech Borehole Resistivity System Geotech Borehole Resistivity System

Resistance logs record the electrical resistance from within a borehole to an electrical ground at the surface. Resistance logs are used to determine lithology and location of fractures.

The Geotech Borehole Resistivity System is a rugged, portable, hand-operated downhole logger which measures both apparent resistivity and the natural self-potential (SP). Applications include mineral exploration, subsurface mapping (isopachs), locating fresh and salt-water bearing information; lithologic and structural correlation between wells, and well construction.

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Magnetic Locators SubSurface ML-1M

SubSurface Model ML-1 Series & ML-3 Series Magnetic Locators

Make finding buried metal objects easier with the most sensitive and ruggedly-built ferromagnetic locators available. Locate steel well heads, survey pins, iron pipes, manhole covers, and other ferrous objects hidden under pavement, grass, or snow.

Call 1.800.833.7958

SubSurface Instruments Model ML-1/ML-1M & ML-3S/ML-3L Specifications
SubSurface Instruments Model ML-1 and ML-1M Instruction Manual
SubSurface Instruments Model ML-3S and ML-3L Instruction Manual


Geotech Borehole Resistivity System used in Nigeria

Sand Shaker
Geotech Sand Shaker

Grain-size analysis is used for studying soils, sediments, sands, or rock by determining size, distribution, and proportion of selected particles.

The Geotech Sand Shaker is a manual sieve kit designed to provide reliable grain size analysis. It features 20 stainless steel screens ranging in size from US Sieve No. 4 to 270. The sample is placed into the top of five clear acrylic cylinders, shaken to distribute particles, and volumetric percentages are indicated on the Shaker frame for quick and accurate gradation.

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Downwell Camera Systems

Laval SC-350 & SC-500 Borehole Cameras

Downwell camera systems are portable video devices designed to inspect water wells and boreholes. The Laval SC-350 and SC-500 borehole cameras are portable systems for water wells and boreholes from 2 inches (5 cm) to 10 inches (25 cm).

Call 1.800.833.7958

Laval SC-350/SC-500 Specifications
Laval SC-350/SC-500 Operations Manual
Laval Monitor/DVR Quick Start Guide

Enviro System Software
Enviro Data Screen Enviro Spase Screen

Enviro System Software is an environmental data management and statistical analysis software suite that is powerful, affordable, and easy to use. From planning sample events to creating tables and maps for reporting - GCS Enviro System Software is a professional-grade tool that saves time while improving data quality, site management, and reporting tasks.

Enviro System Software Add-Ons:

  • Enviro Data® a local network data storage management system
  • Enviro Spāse® is a Geographical Information System (GIS)
  • Enviro Portal is an online website for viewing shared data sets
  • Enviro Cloud allows you to work from the Cloud with full Enviro
    Data® functionality

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More GCS Enviro System Software information