Geotechnical Site Investigation & Geo-Environmental Risk Assessments


Phase II Site Investigation & Geo-Environmental Risk Assessments Services

At Roberts Environmental we provide a comprehensive Phase II Site Investigation service to a wide variety of clients throughout the UK.

Phase II Site Investigations can be carried out as;

site investigation report

A requirement of planning to evaluate the contamination status of the property

site investigation report

To identify any contamination which may be present, derived from current and historical development/site activities

site investigation report

Subsequent to findings of Phase 1 and Conceptual Site Mode where significant historical contamination may have been identified or the site is being developed into a more sensitive end use.

site investigation report

Used to amend Conceptual Site Model

Our Phase II Environmental Site Investigation Reports and Risk Assessments enable property owners and developers to make informed decisions on the contamination status of a site.

Phase II Site Investigations are used to advise on foundation design by testing soils for engineering properties, which are later passed on to engineering and construction contractors.

geotechnical site investigation

The Process

Phase II Site Investigations are carried out in accordance with:

  • Site Investigation Steering Group (2012) UK Specification for Ground Investigations.
  • BS 10175:2011+A2:2015 Investigation of Potentially Contaminated Sites – Code of Practice.
  • BS EN ISO 14688:2018 Geotechnical Investigation and Testing – Identification and Classification of Soils.
  • BS EN ISO 14689:2018 Geotechnical Investigation and Testing – Identification, Description and Classification of Rock.
  • BS EN 1997-1:2004+A1:2013 Eurocode 7 – Geotechnical Design.
  • BS 5930:2015 Code of Practice for Ground Investigations.
  • BS 8485:2015+A1:2019 Code of Practice for the Design of Protective Measures for Methane and Carbon Dioxide Ground Gases for New Buildings.
  • CIRIA C665 (2007) Assessing Risks Posed by Hazardous Ground Gases to Buildings.
  • Environment Agency (2000) Technical Report P5-066/TR – Secondary Model Procedures for the Development of Appropriate Soil Sampling Strategies for Land Contamination.
  • Environment Agency (2004) CLR 11 – The Model Procedures for the Management of Land Contamination.

A number of methods are used such as trial pitting and boreholes to investigate subsurface for soil engineering properties and contamination.

We can provide a fully comprehensive service including mobilisation of subcontracted drilling crews and excavators and oversee intrusive works. Our engineers maintain a site presence throughout each fieldwork project and will log and sample soils, as well as carry out in situ testing.

Samples are collected during each investigation and sent to UKAS accredited laboratories for further testing to identify any potential contamination and soil engineering properties.

site investigation services


The findings of the investigation and subsequent laboratory testing are compiled in a Phase II Geo-Environmental Report and Risk Assessment. Within this, recommendations are made with regards to possible remediation strategies if significant contamination is identified, and also with regards to shallow foundation design, based on geotechnical parameters.

The Phase II report can also be used to satisfy conditions of planning.

For further information about how we can help you with Phase II Site Investigation & Risk Assessments please contact a member of the team on 0191 230 4521