Geocon Site Investigations Engineering Geologists

We provide site investigation, ground investigation, geotechnical and environmental consultancy and geothermal services across the UK. Our site investigation consultants and contractors specialise in environmental (geoenvironmental), geotechnical & geothermal consulting with construction industry focus on ground engineering and engineering geology for Brownfield and Greenfield land.

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What is a Site Investigation?

There are three phases of site investigation:

  • Phase 1 – Site Investigation Desk Studies or Preliminary Site Investigations. This is the minimum requirement for a developer.
  • Phase 2 – Further investigations based on the findings of the preliminary site investigations including sampling and testing.
  • Phase 3 – More intrusive testing if deemed necessary at phase 2 either due to significant contamination or variable results across the site.

Why is Site Investigation Necessary?

The purpose of site investigation is to determine the engineering properties of the land and see how its composition of rock and soil will interact with a planned development. With this information, a risk assessment can be carried out to evaluate the risks to humans, the property and the environment.

Phase 1

Phase 1 is the only necessary phase of a site investigation. In this phase, a conceptual site model (CSM) is created to identify pollutant linkages. With the CSM,  picture of the sites environmental setting can be drawn up.

The aim of the CSM is to present data clearly to provide support when it comes to deciding how to manage contaminated land or groundwater. Once a CSM has been drawn up, gaps in data will be more obvious and can be considered. Further test may also be required. A CSM can be easily updated to reflect the progress of the site investigation.

Phase 2

Phase 2 may be necessary if further investigations are required to fully inform the making of the CSM. Often, information collected during phase 2 is for geoenvironmental and geotechnical purposes. Each technique tests for something specific so the process is often a combination of intrusive investigations using different techniques.

The ideal Phase 2 Site Investigation would be designed to collect information for the whole site to reduce the need for further investigations. However, on a site that varies widely or has significant levels of contamination further investigations may be required.

Phase 3

Phase 3 follows Phase 2 where further investigations are needed because the site varies or shows significant levels of contamination. Like phase 2, the investigations are all intrusive. Exploratory holes are usually spaced around 25-50 cm apart depending on the size of the site to create a comprehensive picture of the make-up of the site.

By increasing the density of testing areas, a more detailed picture of the site can be built up. This is particularly good for sites that have large variations in the composition of the ground. Further tests on the soils extracted will show the chemical composition of the soils and will give an indication of how much needs to be removed.

Fully Accredited

GeoCon are members of the British Geotechnical Association, AGS, CHAS Accredited and registered with ISO 9001, 14001 and 18001.

Expert Service

GeoCon specialise in Ground Engineering and Engineering Geology focusing on site investigation for all sizes of projects.

Competitive Prices

We Guarantee to beat any like for like quotation, contact us today to find out how GeoCon can help with your next project no matter the size.

Nationwide Coverage

GeoCon SIte Investigations have six regional offices located in London, Manchester, Birmingham, Newcastle-Upon-Tyne, and Bristol.