There are a variety of biological hazards that may be present on a construction site and any of these could lead to disease if precautions are not taken to reduce the risks. Some of these diseases can be serious or fatal.
Not all sites will contain biological hazards. Sites where groundwork, refurbishment, or demolition work is taking place are more likely to be affected. Common hazards leading to potential for exposure to biological hazards that could cause disease include:
If any of these are present on your site, a risk assessment will be needed to determine the precautions to be followed when working on the site.
All sites must have adequate welfare and washing facilities, regardless of whether biological hazards are present. This is a requirement of the law. The washing facilities must include an adequately sized sink ie large enough to wash the hands, face and forearms. Hot and cold (or warm) preferably running water, soap (or other cleaning products) and towels (or other means of drying) must also be provided. In some circumstances, additional facilities may be needed. For example, when dealing with sewage, nail brushes and disposable paper towels should be provided in addition to the usual facilities. If heavy contamination is foreseeable, showers will also be appropriate.
A risk assessment will be required to determine the correct work methods and equipment to be used during the work but, in addition, where biological hazards are suspected, workers should practice good occupational hygiene including:
Areas for storage of clean and contaminated equipment must be kept apart and separate from eating facilities. Provision of suitable washing facilities and good hygiene measures, such as those described above, can be sufficient to control the risk of infection on some sites, depending on the hazards present.
Good washing facilities should be provided and good occupational hygiene measures should be followed, as described in the questions above, when dealing with bird droppings. Common activities, such as cleaning of windowsills, will not result in high exposures to infected material and are not high risk. For larger quantities, use of high pressure water should be avoided to minimise creation of droplets of water containing infected material, but wetting down the work area (using low pressure) will help to prevent inhalation of infected dust, reduce the risk of infection and will also prevent the spread of dust outside the work area. Containing the work area with plastic sheeting should also be considered. If required, following a risk assessment, for example when larger quantities of droppings are involved, a “P3” or “FFP3” mask should be used. These masks are designed to provide a good level of protection from particles in the air. A supplier of respiratory protective equipment (RPE) can help you choose the correct type of mask. If you need to use this kind of equipment you need to have a “face fit test” which is a test to ensure that the mask fits properly, before it is used. If the mask does not fit properly, it will not provide protection. Overalls should be worn when carrying out this work, and replaced when they are soiled.
Where there is a chance that needles might be present, such as during demolition of derelict buildings or in areas where recreational drug use has been identified, a risk assessment should be carried out. This should include an assessment of the need for vaccination against hepatitis B for staff involved in removing the needles. You should consult an occupational health provider when doing this assessment.
Workers removing sharps, such as needles, from a contaminated area should be trained in how to carry out the work safely. A ‘needle picker’ should be used to remove them, rather than hands. Needles should be disposed of into a sharps box and the box should not be over-filled. Training should include the hazards associated with needlestick injuries, including the risk of infection with blood borne viruses, such as Hepatitis B & C and HIV, and the procedures to be followed during the work.
In the event of a needlestick injury, after appropriate first aid, the member of staff should consult their occupational health provider or the nearest A and E department, as soon as possible, to be assessed for PEP (post exposure prophylaxis) for HIV and post exposure immunisation for Hepatitis B, if not already vaccinated.
If you would like further information about biological hazards including:
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Trade associations and other industry bodies can also be a good source of information about how to control exposure to biological hazards in your work.