Phase II Site Investigations

Unsurprisingly, site investigations follow seamlessly from Phase I Desk Studies and this is where our engineers and experts get a chance to really see what lies beneath!

Phase II site investigations typically involve the use of intrusive methods such as trial pits, window sampling, cable percussive and rotary boreholes.

These techniques are designed to determine the exact ground conditions and enable foundation solutions and any remedial requirements to be assessed.

The results of the intrusive investigation allied to laboratory testing and typically gas and water level monitoring provide actual data required to prepare a full interpretive site investigation report. As part of this process, the Phase I conceptual model is refined, and the most cost-effective development solutions are outlined.

GRM’s Phase II investigations are designed in accordance with:

  • Land Contamination: Risk Management (LCRM, Published 8th October 2020).
  • BS 10175:2011+A2:2017, Investigation of Potentially Contaminated Sites.
  • BS 5930:2015+A1:2020 Code of practice for ground investigations.
  • EN 1997-1:2004 Eurocode 7: Geotechnical design – Part 1: General rules.
  • EN 1997-2:2007 Eurocode 7: Geotechnical design – Part 2: Ground investigation and testing.
  • BS 8576:2013 Guidance on investigations for ground gas. Permanent gases and Volatile Organic Compounds (VOCs).
  • CIRIA C665 – Assessing risks posed by hazardous ground gases to buildings (2007).
  • CIRIA C682 – The VOCs Handbook. Investigating, assessing and managing risks from inhalation of VOCs at land affected by contamination (2009).
  • BRE Digest 365 – Soakaway Design (2016)

Examples of recent GRM news stories related to site investigations can be found via the following links:

To discuss any requirements you might have for a Phase II Site Investigation, or any other service, please complete the contact form below or call us directly on 01283 551249.

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