Cork City Council

Large Diameter Long Reach CCTV and Sonar Sewer Survey

Project Overview


Cork City Council







Project Summary

Long Reach CCTV and Sonar Sewer Survey

The key drivers for this Project included the following:

  • Critical Sewer survey condition location, degradation, siltation and reporting to include recommendations for interventions.
  • Carry out all works to include manhole surveys of 35 cat R chambers, 4000 meters of pipe line from 15 to 25-meter average depth, two syphon sections under the river Lee in busy city centre location terminating at Atlantic Pond Pump Station.
  • Sewer to be surveyed live, at full flow, no isolation possible of the syphon sections. Tidal influence and weather dependent.

The Challenge:

  • To survey the 3-meter diameter pipe line and assets by non-person entry with points of access 1500 meters apart. Precision Group specialise in large diameter long reach CCTV and Sonar surveying of lines most contractors cannot reach.
  • Situated within a busy urban city centre and docklands area this presented challenges to our team all of which were overcome.


  • Pre site survey to identify access and carry out robust risk assessment and specify survey method in line with clients’ deliverable requirements.
  • Pre-Site completed out of hours under full traffic management to identify roads for closures and apply for lane closure permits.
  • Plan the works and commission a purpose-built pipe inspection vehicle.
  • Establish lifting plan for heavy duty covers both on and off-road sections.
  • PIV/Pipe Inspection Vehicle to be capable of full side and invert sonar scan along with front and rear facing HD CCTV. Utilising a tethered system with a reach of 4000 meters and cable.
  • Chainage recorded and Wincan enabled to allow integrated reporting.
  • Agree safety plan with client prior to works.

Reason for Survey

Sewer network condition location CCTV surveys and associated specialist services were carried out by the Precision Group within Cork City and Cork County Council areas surveying sewerage assets falling under the control of the employer Irish Water and the local councils. As part of the “Irish Water Sewer Network Survey and Associated Services surveying Framework”.

The scope of the works included scoped CCTV and Sonar surveys of certain network assets as determined and set out for survey by the client’s representative RPS Cork.

Precision gathered set data and information reported within this report on:

  • The general layout of the sewer network scoped for survey.
  • Precision captured and recorded data relative to the below ground and above ground sewerage assets as determined by the contract scope.
  • Ground Topography limited to cover levels and location of uncharted assets. Identification of silt levels within the sewer network general condition surveying.
  • Record and report the internal condition and location of sewer asset pipe lines.
  • Identify any cross connections between foul and storm networks within storm lines.
  • Gathering data and updating the client Irish Waters Infonet database.
  • Precision Group carried out the site works and produced a detailed factual report including CCTV/Sonar Scan footage data-capture including full photographic records of internal pipe condition as surveyed.

Description of sewers surveyed:

Sewers scoped for survey by client’s representative foul and combined cat R sewers with various diameters ranging between and including 1500mm and 3000mm.

The CCTV Sonar survey was required primarily focused on large diameter interceptor sewers previously not surveyed due to access and reach limitations by past survey companies. Large diameter lines were constructed over ten years ago, CCTV requirements were identified based on the WRC sewer rehabilitation manual categorisation by RPS of Cork the client’s representative.

Scheduled length of survey was 4 km at locations listed within the contract specification documents.

Equipment used and survey standards:

The equipment utilised was a purpose built semi-submersible pipe inspection vehicle or tethered PIV with a 4km reach from any point. All calibrated equipment certified and conforming to the IW standard IW-MOD-TEC-5030-002 and the WRC standard WRC-SRMC.

Reporting software utilised for compilation of survey data within this report was Wincan VX. All reporting and sewer classification surveys were carried out to MSCC5 standard by qualified and certified surveyors. In line with and gathered at the time of survey to, MSCC5 and IW-MOD-TEC-5030-002, WRC-SRMC standards.

Quality Control:

A. Precision Group internal quality control procedure PISQA-2001-WRC-03 all internal Precision survey data was subject to Precision quality control checking of all data prior to submission to the client’s representative for their external quality control check of 5% of data submitted as per the IW standard IW-MOD-TEC-5030-002.

B. RPS quality control checks of 5% of submitted survey data carried out.

C. Data input quality control, all data converted to and input into Infonet and validated prior to issue to clients reprehensive was subjected to validation checks as per the Irish Water Validation standard for CCTV results are listed below.

All assets surveyed and reported to standard including QA check of all data.

Asset Condition Report including scans and footage.

Condition degradation assessment report.

Recommendations for rehabilitation, cleaning and civil repairs.

Have an Enquiry

Make an Enquiry

Fill in your details and we’ll get back to you as soon as we can.

This field is for validation purposes and should be left unchanged.

Steven Pimblett

Head of Finance

After studying accountancy at Queen’s University of Belfast and qualifying as a Chartered Accountant in 2001, Steven “moved to industry” in 2002, holding senior finance roles with several local businesses.  

Steven joined The Precision Group in 2019 and was appointed Finance Director in 2020.  Steven leads Precision’s experienced and dedicated Finance Team.  He constantly strives to maximise the long-term financial performance of the Group via the provision of robust, considered and pragmatic guidance to both internal management and the board.  

In addition, Steven, together with the finance team, manage the day to day finances of Precision and provide accurate and timely information to a wide range of internal and external stakeholders.    

Eddie Finn

Head of Technical Services – Construction & Building Division

Eddie joined The Precision Group in 2016 as Head of Technical Services for the Construction & Building Division.

With over 25 years’ experience within the Construction & Building Sector, Eddie has managed many large scale construction projects across the UK and Ireland.  

Along with a wealth of industry experience, Eddie holds numerous professional qualifications and accreditations, including MCIOB, ACIBE, IOSH, NVQ Level 7 in Construction Senior Management and the Constructions Skill Register Black Construction Management Card.

Not content with standing still, Eddie is currently working towards the NEBOSH National Certificate in Construction Health & Safety.

Alan Stringer

Senior Contracts Manager

Alan is one of the company’s longest-serving employees, having joined the Precision Group in 2000 as a Specialist Contracts Manager.

He is currently responsible for the development and management of the Precision Group’s specialist technical services, primarily within the Utility Data Capture arena.  Latest projects include the Cork City DAP, which was one of the largest European drainage asset surveys completed in recent years.

Alan often represents the Group at various international water and engineering sector forums.  In his spare time, he is a motorcycles and rugby enthusiast.

“Our dedicated Utility Data Capture team offer specialist asset surveying and data management services across the UK, Ireland and Europe. It is imperative we remain at the forefront in terms of the technology we utilise, both on site and within our back office, including the provision of industry leading data packages designed to exceed our clients requirements.”

Kevin Lynch

HSE Manager

An experienced HSE Manager, Kevin’s primary role within the Group is to lead a positive HSE culture throughout the company and bring practical HSE solutions to the day-to-day operations of the business. 

Kevin provides professional advice and support for the Group’s Contract Managers, Supervisors and other staff in relation to all health, safety and environmental matters, including client site audits.

As HSE Manager, Kevin has overall responsibility for compliance with all current legislation, including codes of practice and relevant standards, across The Precision Group. He also manages the Group’s Integrated Management System, including ISO 9001, 14001 and 45001, ensuring critical control points are monitored effectively.

With over 30 years’ experience within the Fire and Rescue Service, Kevin brings a wealth of experience to the role.

Seamus McCallan

Operations Manager – Construction & Building Division - Asbestos

After being involved in his family business for over 15 years,  Seamus joined The Precision Group as one of two Contracts Managers, overseeing all projects within the specialist Asbestos division.

Now head of the Group’s Asbestos Division, Seamus has primary responsibility for over 20 staff, managing projects in excess of £1.5m last year.  With over 25 years’ experience within the Asbestos and Demolition / Construction industries, Seamus has a wealth of experience within the sector, paired with exceptional communication and leadership skills.

Seamus places significant emphasis on open and transparent communication, fostering strong relationships between clients, contractors and internal stakeholders alike, to ensure projects are completed on time and within budget.

“Having experienced several changes within the Industry over the past three decades, the ability to improvise and adapt in any given situation is essential.  As a team, we continually strive to deliver the best service in our field”.

Kevin Williams

Managing Director

Kevin has a long history with The Precision Group, beginning his tenure as Financial Controller, some 20 years ago.  His career quickly progressed to Finance & IT Director, leading to his current position of Managing Director in 2013.

As a Chartered Accountant, Kevin has a steely interest in the financial planning and management for all Precision Group Companies, playing a pivotal role in the overall strategic direction of the Group.  Kevin is an inclusive Managing Director, leading the Senior Management team and empowering them at every opportunity to push forward.

In Kevin’s words –

“The company started over 30 years ago as a local contract cleaning company; I am proud to have been part of the company’s growth to become one of Northern Ireland’s most diverse business providers.  Today, in addition to our core Facilities Management services, we offer a host of other specialist services including asbestos removal, thermo-chemical cleaning and process equipment refurbishment.  We will continue to invest in the up-skilling of our workforce who are paramount to our future growth and will continue to fervently seek out opportunities in other sectors and geographic locations.  We are delighted to include some of the top players within the Global Oil & Gas industry, in our client lists.”