The Role Of GPR Surveys and CCTV Survey for Underground Pollution Control

The use of surveillance technology and trenchless underground survey systems has been there in Ireland for the last 3 decades. But newer innovations of CCTVs and GPR technologies have allowed high-quality audio-visual imaging and cross-section imaging respectively. This has pushed the edge for underground infrastructure management to have a broader scope of environmental remediation.

 

Underground Pollution Control has become a pivotal cause for the Irish Government to protect the environment and also the health of urban people. The Environmental Protection Agency (EPA) released the new 2021 Code of Practice to be in effect from the 7th of June 2021 which sets new parameters for site assessment and underground pollution survey for wastewater management. The National Inspection Plan sets new guidelines for monitoring and assessment of wastewater, which heavily relies on GPR and CCTV Surveys. 

 

Background of Wastewater Management in Ireland

 

Fundamentally, Septic Tank systems are prevalent in Ireland as the prime wastewater management utility.

 

Foul water flowing through bathrooms, kitchens, dishwashers and laundry machines passes through the Septic Tank placed outside of the property. This water would have tons of solid wastes and sludgy materials that are collected inside the tank filtration system. The strained foul water flows out into the Percolation Area as effluents are released from the septic tank that is finally treated and disposed of to enter the Water Mains. The Septic Tank and the connecting ducts and pipelines to the Percolation Area need to be cleared off the solid deposits from time to time. Further down, the Water Mains and Laterals of the Sewage System need to be cleaned off of blockages too and to further inspect any anomalies.

 


For effective wastewater management, the outfall and catchment area is surveyed for any evidence of pollution. This can be anything from chemical corrosion, physical intrusions, radioactive to bacteriological anomalies.

 

Cross-Contamination happening from foul water entering the stormwater systems due to pipeline misconnections is a common issue after storms.

 

CCTV footage and GPR reports are widely used to locate, identify and document the issues. The technologies are highly flexible and can be used on various locations, manholes, pipelines and outfalls. The survey reports are heavily used for blueprinting remedial actions as well as evidence for Wastewater Treatment compliances.

Utility Survey, PAS 128 Compliance and Other Pollution Remediation

 


GPR mapping is a part of underground utility surveying that must comply with PAS 128 Detection parameters in the Republic of Ireland. The PAS 128 Detection Survey, Type B, covers GPR surveying. For these inspections, it is critical to collect 100% utility depths. The engineers who perform this survey must have specific qualifications to certify their capability to understand the GPR radargram.

 

There are different parameters, levels, and types of GPR surveys in Ireland used for environmental remediation. Most underground pollution and utility mapping surveys utilise the Type B detection system, but there are higher quality levels for this, such as the QL-A, that applies for direct surveying projects like exposed utilities inside manholes.
Location: Cork, Ireland

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