Here are some common hazards associated with working on equipment in a sewer environment:

• Exposure to pathogens - Sewers contain raw sewage that can expose workers to pathogens like bacteria, viruses, parasites and fungi which cause diseases. Proper PPE like gloves, boots, clothes, goggles and respirators are critical.

• Toxic gases - Hazardous gases can accumulate in sewers like methane, hydrogen sulfide and carbon monoxide. These can be explosive, corrosive or toxic. Proper ventilation and gas monitors are important.

• Confined space hazards - Working in tight, narrow sewers can lead to issues like lack of oxygen, entrapment, engulfment, etc. only trained personnel should enter sewers and they must follow confined space entry procedures.

• Falling objects - There is a risk of tools, debris, pipes and other objects falling from above and injuring workers. Hard hats must always be worn in sewers.

• Slips, trips and falls - The wet, uneven terrain and slippery surfaces of sewers can easily cause slips, trips and falls. Extreme caution must be exercised and protective equipment like boots with slip/oil/puncture resistance should be used.

• Exposure to chemicals - Though raw sewage is mainly water and waste, some chemicals may be present that can cause burns, inhalation issues or contamination. Proper PPE and training on any chemicals that could be encountered is important.

• Collapsing structures - Over time, sewer walls and pipes can deteriorate and collapse, trapping or burying workers. The structural integrity of sewers should always be assessed before working on equipment within them.

• Heavy equipment hazards - Large machines used to clean, repair and maintain sewers can pose risks of crushing injuries, entanglement, overhead hazards and instability. Only properly trained operators should use heavy sewer equipment.

• Extreme temperatures - While sewers are often damp, temperatures can get very hot or cold, causing heat/cold stress. Appropriate work conditions, breaks and PPE should be provided based on temperatures.
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