Air Quality Report: In Tunnel Air Quality Monitoring ... · • ACO403 has continued to flat line for the month of May 2014. This is one of the units to be replaced once new units

Air Quality Report: In Tunnel Air Quality Monitoring, May 2014 1 of 11

M5 East Freeway

Air Quality Report: In Tunnel Air Quality Monitoring

Report 6

May 2014


Document change control

Revision history

Version Issue date Updated by Comments

001 02/06/14 Lucy Havyatt

002

003

References

Document name Version Abbreviation


Summary

• This report is provided consistent with Exhibit 1 of the O&M Contract (SSR, Appendix 24, Item 21).

• CCTV cameras are used to monitor conditions within the tunnels and jet fans are used to increase tunnel ventilation, ensuring that tunnel air quality remains within specified limits.

• AQS404 was removed in the April closure for further investigation and has been found to have failed beyond repair. A replacement Air Quality Sensor Unit has been ordered and will be installed in the scheduled monthly closure period directly following delivery of the unit.

• The communication fault between the ACO301 unit and the VCA400 evaluation unit was rectified by LCPL technicians on 10th May 2014 and is now reading correctly.

• ACO604 has recording readings of zero following the May 2014 schedule maintenance closure period. This issue will be investigated by LCPL technicians throughout the week ending 6th June 2014 to determine the issue.

• ACO403 has continued to flat line for the month of May 2014. This is one of the units to be replaced once new units are received by LCPL.

• Due to the repetitive failures, considerate of the RMS Air Quality Improvement Program but consistent with the O&M Agreement, LCPL has placed orders for 2x ACO and 2x AQS units in April with the objective of installing the units in July due to the projected 12 week lead time. LCPL will be replacing the units which are no longer able to be adequately and confidently repaired


Preamble

Air Quality Report: In-Tunnel Air Quality Monitoring This report shows the carbon monoxide and visibility levels in the M5 East Tunnel (Main Tunnel) and the Cooks River Tunnel (CRX Tunnel).

Carbon Monoxide Carbon monoxide (CO) is monitored in the tunnel because exposure to high levels can be harmful to people’s health. The limits in the tunnel are based on World Health Organisation guidelines for short term exposure to CO. The limit for CO in the tunnel is 87 parts per million for 15 minutes and maintaining levels below this limit is a requirement under the Ministers Conditions of Approval for the M5 East Freeway. The level of CO in the tunnel is continually measured and the ventilation system is adjusted to ensure that the concentration of CO within the tunnel remains below the required levels.

Visibility Visibility is measured in the tunnel because poor visibility can make driving conditions dangerous. The major cause of reduced visibility or haze in the tunnel is from smoky vehicles, mainly for diesel trucks. Visibility limits used in the tunnel are taken from the World Road Association guidelines which recommend the tunnel is closed if the visibility reaches 0.012/m.

15 minute time weighted average This refers to the CO or visibility readings averaged over a 15 minute period with this reading being updated every 15 minutes.


Main Tunnel Ventilation System

ACO604

ACO403

AQS403

AQS404 AQS301

ACO301

ACO302

AQS302







Documents

Air Quality Report: In Tunnel Air Quality Monitoring ... · • ACO403 has continued to flat line for the month of May 2014. This is one of the units to be replaced once new units