Mr. Declan Burke:

The vent stacks are fitted in close proximity to the district installation, which could be a metre or less. They are identified as a gas installation on the district regulating installations. There is also a contact number, 1800 20 50 50, for people in the event that they smell gas. That connects them to GNI's 24-hour, seven days a week and 365 days a year contact centre form where GNI responds to leaks within the hour. If these stacks vent, it would not be continuous venting. As I said, during normal operations they are not designed to vent.