Air Quality Monitoring
Hazard Management are able to undertake air monitoring for a multitude of different contaminants.
Asbestos Air Monitoring
Control monitoring – undertaken outside of the removal enclosure, before and during the removal process to ensure that the airborne fibre count remains the same during the works as it was before works commenced. This also confirms the presence of any leaks in the enclosure so that they can be remediated immediately.
Background monitoring – undertaken when asbestos is present but not being removed. When an asbestos-containing material is staying in situ we are able to monitor the air around it to ensure that is it not releasing airborne fibres.
Clearance monitoring – undertaken once removal works have been completed and all dust and debris have been cleaned up. Clearance air monitoring is required for all Class A removal work and is sometimes conducted after Class B removal works as well. The clearance certificate must be issued before people can be allowed into the area after the removal works have been completed.
Personal monitoring – can be carried out at the request of the contractor to ensure that the workers in the enclosure are not being exposed to high levels of asbestos fibres in the air outside of their face masks. It is also best to carry out personal monitoring to determine the effectiveness of the controls the removalists are using to reduce the release of fibres inside the enclosure.
Emissions from landfill can cause serious problems that are now widely known, especially when the gases, after escaping from the site, accumulate in enclosed spaces where they can present a latent hazard, giving rise to explosions under the certain conditions.
Landfill gas monitoring is therefore a critical concern for landfill operators. Landfill gas, which has approximately 50 percent methane and 50 percent carbon dioxide with trace components, is produced through bacterial decomposition, volatilization and chemical reactions.
AMBIENT DUST MONITORING
Dust emissions can have significant effects on human health as well as the environment, and these effects are dependent on the source of the dust and the sensitivity of the environment/recipient. Most health effects are most often associated with particle sizes less than 10 microns (PM10) as these are small enough to be inhaled. Sources of dust can be from vehicles, construction works, ground works, waste handling facilities, agriculture, stockpiles of soil/sawdust/coal, and various industrial process such as mineral processing, sand blasting and concrete cutting.
It’s important to monitor dust levels (and weather conditions simultaneously) in order to establish patterns as well as the concentrations of dust in order to be able to manage the potential impact on health and the environment. The Resource Management Act 1991 (RMA) requires that councils monitoring the air quality in their areas and formulate air quality plan that contain air quality targets/objectives and methods on how to achieve them.
Dust monitoring can also play an important part in land remediation and construction projects where real-time data is needed to ensure dust is not escaping from the work area and causing a risk to the public or environment.
The ‘Good Practice Guide for Air Quality Monitoring and Data Management 2009’, ‘National Environmental Standards (NES) and the Ambient Air Quality Guidelines (AAQG) provide New Zealand specific guidance on monitoring, guideline values, strategies and appropriate methodologies.