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Project Requirement

Bernard Daly, commissioned Síor Consulting Ltd to undertake an investigation to identify depth to bedrock beneath a new housing development site, thereby estimating the volume of materials to be excavated for the construction of house foundations and to determine groundwater resource availability.

Project Solution

The investigation comprised an Electrical Resistivity Tomography (ERT) survey, a non-intrusive geophysical technique used to provide a provisional assessment of ground conditions. ERT surveys were processed to produce ground profiles and then interpreted to correlate the resistivities with geological units. The data was used to determine the presence and depth to bedrock. This in turn informed approximate cut and fill volumes for the construction of the proposed developments. The interpretation of the ERT surveys indicated the presence of saturated sediments bound by sandstone bedrock. Freshwater well locations within sandstone bedrock were also determined and reported on.

Project Benefit

The works undertaken allowed our client to meet the required planning conditions and project objectives in a cost effective, accurate and timely manner with little to no intrusive survey works required.

Activites Completed

  • Desk based pre-survey geospatial analysis (including topographical analysis, geological setting and the geomorphology) to inform effective deployment of ERT survey locations.
  • Site walkover surveys
  • ERT field surveys
  • Geospatial analysis and post-ERT survey processing and interpretation
  • Geological and hydrogeological analysis and interpretation
  • Drawing production

Project Details

Client: Bernard Daly
Project title: Crookstown Cross Property Development – ERT Survey and Geological Investigation
Location: Crookstown Cross, Farnanes, Co. Cork, Ireland
Date: 2020 – 2021
Main Síor contact: Timothy Neville (

Areas of Expertise

Geotechnics: Electrical Resistivity Tomography (ERT)
Geospatial Solutions: Geospatial Analysis
Water Resources: Geological and Hydrogeological Interpretation & Analysis

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