Our Services

With continuing investment in our own rigs, crews, geotechnical soils laboratory and engineering team we deliver an ever-developing list of services in the ground investigation sector.

Ground Investigation Phases 1 - 4 ]

What is a Ground Investigation?

“The ground is naturally variable and often the nature of these variations is not known.” [1] BS 5930 : 2015 - PAGE 1

A ground investigation aims to gather information about the strata profile and inform foundation design and remediation of contamination.

A competent and cost effective ground investigation should address and control the risks presented by the ground, and contribute to the success and sustainability of the project.

Why do I need a Ground Investigation?

A ground investigation is most commonly used to assist with foundation design and address potential contamination issues as part of the planning process, as well as to support an application for a building guarantee.

What is involved in a Ground Investigation?

// Phase 1: Desk Study Case Study

Briefly, a Phase 1 Environmental Desk Study collates relevant information from a variety of sources relating to the site setting and its previous historical uses. The end product is an interpretive report that describes the potential presence of any contamination on the site and the associated risks that this may pose to future site users and the immediate environment. A site walkover is required to support the desk study information and provide greater certainty in the report findings.

// Phase 2: Site Investigation

Following on from the Phase 1 Desk Study, this involves physical testing of the ground to collect soil and/or rock samples for geotechnical and contamination laboratory testing. The methods used here range from shallow boreholes and machine or hand excavated trial pits, to deeper boreholes to collect rock samples or investigate for coal mining voids. All samples obtained are logged by an engineer and submitted to our UKAS accredited laboratory for subsequent detailed testing. An interpretative report is then compiled by a member of our in-house engineering team, offering foundation solutions, and initial remedial suggestions where contamination has been identified.

// Phase 3: Remediation Strategy

Also sometimes referred to as a Remediation Statement, this document details the steps required to remediate contaminated sites, a working document to be used as part of the final construction methods.

// Phase 4: Validation/Verification Report

A validation/verification report must be submitted following completion of the remediation works. This report must include evidence to demonstrate that the Phase 3 works have been carried out in accordance with the Phase 3 Remediation Strategy, and that remedial targets have been met.

Drilling & Excavation

RGS have an extensive range of in-house rigs and equipment that are capable of undertaking the following:

  • Windowless Sampling with SPT’s
  • Dynamic Probing
  • Rotary Openhole Drilling for Coal Workings
  • Rotary Coring of Rock
  • Light Cable Percussive Drilling
  • Trial pits - hand and machine excavated
  • Concrete Coring
  • Handheld Windowless Sampling
  • Handheld Augers
  • TRL Probing
  • Installation of gas/groundwater monitoring standpipes, piezometers and inclinometers

Should sub-contract services need to be brought on-board, these are carefully selected from approved companies with which we have established relationships.

Insitu Testing

RGS have an extensive range of in-house equipment that is capable of undertaking the following:

  • Infiltration Testing to BRE 365 (often referred to as “Soakaway” testing)
  • California Bearing Ratio (CBR) Testing
  • Plate Load Testing
  • Hand Shear Vane & Mexicone Testing
  • Insitu Density Testing (Core Cutter/Sand Replacement)

Should sub-contract services need to be brought on-board, these are carefully selected from approved companies with which we have established relationships.

Laboratory Testing & Gas Monitoring

Based in our Huddersfield head office, our UKAS accredited geotechnical laboratory carries out various geotechnical rock and soil tests. This can provide key data for projects within the construction industry.

To create a foundation design, reliable strength and compressibility data is required, in addition to, soil classification and grading, and also analysing soil to determine any chemical aggression to concrete.

To investigate slope stability issues, it is necessary to find the measurement of long term soil behaviour. We also have the capability to assess the suitability of soils for use in embankments, along with subgrade characteristics for road pavement design.

  • Geotechnical Laboratory Testing PDF
    • Classification of Soil
    • Chemical Testing
    • Compaction Related Tests
    • Compressibility of Soil
    • Shear Strength of Soil
    • Permeability Tests
    • Rock Tests
    • Aggregate Tests
  • Chemical Laboratory Testing
    • Contamination Testing Suites
    • WAC Analysis
    • Individual Chemical Tests
  • Landfill/mines gas and/or groundwater level monitoring

Engineering Consultancy

Our in-house engineering team have a wealth and breadth of experience in geotechnical and environmental engineering and geological services. We can offer numerous aspects of engineering consultancy, listed below:

  • Engineering supervision on site
  • Foundation recommendations
  • Slope stability analysis
  • Retaining wall design
  • Soakaway design
  • Geological desk studies and appraisals
  • Rock slope stability
  • Working platform design
  • Crane stability risk assessment

Surveying & Flood Risk Assessments

  • Borehole clearance using GPR
  • Utilities service - GPR
  • CCTV Drainage Survey
  • Topographical Survey
  • Flood Risk Assessments

Training, CPD & Expert Witness

Our in-house engineering team holds over 70 years of experience combined, led by our Technical Director, Steve Rogers. Steve has been in the industry for the whole of his career, including a period of lecturing at university. RGS can provide you with a range of CPD and training courses to further your ground investigation knowledge and understanding.

  • Lunchtime CPD’s - site investigation, foundation solutions, contamination & environmental investigation and building over difficult ground.
  • Short courses - held at your premises or at our regional offices.

We can also provide assistance with an Expert Witness. Our Technical Director, Steve Rogers, has been assisting clients with technical advice and witness work for many years, drawing on his knowledge and experience gained around the world in geotechnics, piling and environmental engineering.

The ground is naturally variable and often the nature of these variations is not known (BS 5930 : 2015 - Page 1). A ground investigation aims to gather information about the strata profile and inform foundation design and remediation of contamination.
Certified by Constructionline; Registered ISO 14001 (2015), ISO 45001 (2018), ISO 9001 (2015) Certified by Constructionline; Registered ISO 14001 (2015), ISO 45001 (2018), ISO 9001 (2015)