Tunnel air quality monitoring for Horizon - T3A of Grand Paris Express
Project
UBY’s environmental monitoring expertise with tunnel air quality monitoring of the T3A section of Grand Paris Express metro between the Pont de Sèvres and Issy-Vanves-Clamart stations.
Challenge
Air sensors had already been installed when works began about 2 years ago.
The client (Horizon – T3A joint venture) wanted to add CO2 level monitoring as legal limits had been lowered on 1st July 2020.
Client can monitor the efficiency of ventilation in the tunnel so as to limit how much workers are exposed to specific gas in the tunnel.
Need: track CO2 levels.
UBY's solution for Tunnel air quality monitoring
We provided installation and connection to the uMonitor platform (formerly known as UBY Environment platform), beginning October 2020 until 2024 – 2025 when work is forecasted to end. 8 hour and 15 minute average exposure limits have been set as alert thresholds on the platform. Worksite receives real-time alerts when these thresholds are exceeded.
Our PID sensors also record levels of BTX (benzene, toluene, xylene) during the tunnel air quality monitoring. A suspicion of one of these compounds must then be confirmed by chemical-reacting tubes.
Levels of various gases, dust and VOCs are monitored as the tunnel is bored and our solution helps the worksite make sure ventilation and preventative measures are in place.
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