Towards the end of 2013, Infrastruct AMS was requested to carry out cleaning, inspection and chlorination of two drinking water reservoirs on the east coast in accordance with the EPA Advice Note 10 ‘Service Reservoirs Inpection Cleaning and Maintenance’.
The larger reservoir (≈ 2.6Ml) was recently constructed but prior to final commissioning and entry into service required cleaning, chlorination, water sampling and water testing. The cleaning and chlorination were complete ahead of time and the laboratory testing of the water confirmed that the retained water was suitable for supply.
The older reservoir (≈ 0.9Ml) was out of service and therefore required a detailed inspection with non-destructive testing to determine the remaining service life of the structure and its suitability prior to re-entry into service.
The non-destructive testing of the older reservoir included:
- Covermeter survey to determine the protective cover over the embedded structural steel reinforcement;
- Resistivity survey to examine the corrosion characteristics of the concrete;
- Rebound Hammer survey to establish the effect of leaching and hydrolithic corrosion of the concrete;
- Crack mapping and properties.
A detailed inspection and testing report was prepared and listed recommendations for repair and rehabilitation works to extend the service life of the reservoir.