| For two years a mobile flare stack has been in operation to vent the gas and reduce unpleasant smells. |
| Most of the excavation work will be on the verges but traffic management systems will be in operation on the roads to protect workmen. |
| Several limekilns were in operation, and the developers envisioned a city that would dwarf Birmingham as the industrial center of Alabama. |
| Police said they had no idea how long the factory had been in operation, but estimated it to be around three or four months. |
| While the lake was ice-free, surface vessels kept the lifeline in operation, and pipelines and electric cables were laid under the water. |
| I'm also a long-term member of the list, so there may well have been some bias in operation. |
