Further to my two recent updates on the smell problem in the roadway in parts of Thomson Street, the City Engineer has now advised :"The Road Maintenance Partnership has replaced 4 gullies in Thomson Street with new covers, frames and pots. The pots have a water trap design similar to a domestic lavatory and rely on a water seal to prevent sewer gases escaping from the gully grating.
The gullies were inspected on 11 November and were found to all contain water as required for the seal. However it was also noted that the bungs within the gully pots intended to seal a rodding access to the sewer connection were not in place. As this effectively by-passes the water seal, this could well be the reason for the continued smell ... the bungs have now been correctly installed and I hope that this will resolve the issue.
With the correct operation now of the gullies, there is nothing else that can be done from a Road Maintenance point of view. The sewer covers, which are the responsibility of Scottish Water are a vented type and should the sewer smell still be evident, the matter will need to be referred to Scottish Water for resolution."