Recognizing, Assessing, Controlling & Evaluating Hazards

Recognizing Hazards

A hazard is any practice, behaviour or physical condition that can cause;

  • Injury
  • Illness
  • Damage to property
  • Damage to environment; and
  • Loss to process

Three Steps to Hazard Identification

Step 1: Process Identification

In order to identify hazards you must first determine what processes take place within a facility. Examples of processes may include;

  • maintenance
  • painting
  • welding
  • office work
  • lift truck operation
  • production facilities
  • packaging
  • cleaning & sanitation
  • security; and
  • shipping & receiving

Step 2: Task Identification

The second step is to determine what tasks are performed within the processes. For example, here are some of the tasks that are typically carried out by maintenance personnel

  • electrical installations and repair
  • mechanical repairs and preventative maintenance
  • grounds keeping & snow removal
  • building maintenance; and
  • H.V.A.C. upkeep

Step 3: Hazards within the Task

The third step in this process is to recognize the hazards within each task. This concept is referred to as P.E.M.E.P. because all identified hazards will fall into one of five categories. These categories are;

  • People
  • Equipment
  • Materials
  • Environment; and
  • Process

Examples of Hazards Associated with P.E.M.E.P.

Hazards that people create include;

  • horseplay
  • untrained workers
  • lack of attention
  • making poor decisions
  • using improper techniques
  • using inappropriate equipment; and
  • rushing to get the job done

Hazards that exist when using equipment may include;

  • using improper equipment for the job
  • using an improper technique
  • points of operation causing nips, cuts, amputations
  • exposure to moving parts
  • poor maintenance leading to equipment failure
  • failure of hand tools; and
  • inappropriate personal protective equipment for the job

Hazards that are associated with materials in the workplace may include;

  • sharp, heavy or hot objects
  • hazardous materials
  • improper stacking or storage of material
  • unsecured loads
  • unknown load capacity
  • lifted high into the air; and
  • difficult to handle manually

Hazards in the work environment may include;

  • walking surfaces
  • airborne contaminants
  • congestion or clutter
  • noise
  • heat stress or cold
  • vibration or radiation; and
  • lighting

Hazards that can be associated with processes may include;

  • workplace design
  • job design
  • blind corners
  • schedules for production
  • ergonomic conditions
  • improper equipment; and
  • inadequate spill response measures

Assessing Hazards

Once you have identified the hazards that are present, some method of prioritizing must be established to ensure controls are applied to the most serious risks first. There are a number of methods available to assist in the assessment of hazards. These methods can help committee members determine which of the identified hazards could potentially cause the most serious injury.

One example of an assessment method is to determine airborne hazards through air sampling or constant monitoring depending on the situation.  Testing can be initiated by the committee because of a request made by workers; or to test and benchmark current conditions to determine the level of hazard prior to the implementation of a control; or once implemented, to evaluate a hazard control to determine its effectiveness.

The employer is responsible for having the monitoring conducted in the workplace and a committee is entitled to information from the employer about testing and the outcome.

A designated member who represents workers is also entitled to be present at the beginning of testing, to ensure the validity of test procedures and results.

When assessing a hazard we must have an idea of accepted norms in order to judge the situation. For instance, when we take a sample of air we need to know what we are looking for, the level of acceptable exposure for workers without personal protection, and when we need to consider hazard elimination, substitution or isolation techniques.  In Ontario, we look to Regulation 833: Control of Exposure to Biological or Chemical Agents (a regulation made under the Act) to provide guidance. The Ontario Ministry of Labour generally accepts threshold limit values as published by the American Conference of Governmental Industrial Hygienists, a non-profit organization based in the United States. These values list acceptable exposure levels to which an average worker can be exposed to without any adverse health effects.

The following list contains laws, standards, guidelines and codes against which you can compare hazardous conditions;

  • Occupational Health and Safety Act
  • Regulations
  • Fire and Building Codes
  • Ministry of Labour Standards & Guidelines
  • CSA Standards
  • Workplace Policies and Procedures; and
  • Manufacturers and Suppliers Instructions

Hazards can be assigned a priority classification to help with scheduling and implementation of hazard controls as recommended by the committee. Many classification methods exist and it is up to the committee to adopt the most logical solution. The following is one method;

  • Class ‘A’ Hazard – A major condition or practice that is likely to cause a serious, permanent disability, loss of a body part, death or an extensive loss of building assets, equipment or materials within the workplace
  • Class ‘B’ Hazard – A serious condition or practice that is likely to cause a serious injury resulting in temporary disability of a worker, or major damage to the building, equipment or materials however is non-disruptive and not quite considered a Class ‘A’ Hazard
  • Class ‘C’ Hazard – A minor condition or practice likely to cause a non-disruptive, non-disabling injury or illness, or non-disruptive property damage

Hazard Controls

Once hazards have been identified and assessed, the next step in the process is to determine the effectiveness of existing controls and suggest improvements that may be necessary. Or, in the case of existing controls, determine their effectiveness.

Controls may be applied in a number of ways and in three different locations;

1. At the Source: Whenever possible consider the best way to control a hazard is to apply the control at the source of the hazard. The ultimate control is actual removal of the hazard from the workplace however that may not be prudent, acceptable, logical or feasible.

2. Along the Path: Controls along the path do not remove the hazard, but provide methods to alert the worker that a hazard exists. The goal is to minimize worker exposure.

3. At the Worker: Controls at the worker include personal protective equipment (P.P.E.), training in safe work methods, administrative procedures and disciplinary actions. Controls at the worker may be subject to human error and should be considered the last alternative in a list of hazard controls, especially in the case of P.P.E. Simply put, sometimes workers don’t wear their P.P.E. correctly or not at all and therefore this control can be difficult to monitor and evaluate.

A variety of hazard controls may exist in the workplace, or in many situation, a customized approach is required. There are three basic classifications of hazard controls, they are;

  • Engineering Controls
  • Administrative Controls; and
  • Personal Protective Equipment

Engineering Controls include;

  • elimination
  • isolation
  • substitution
  • automation
  • machine guarding & re-design
  • local exhaust ventilation; and
  • air make-up systems

Administrative Controls include;

  • standard operating procedures
  • training & education
  • inspections & investigations
  • work practice
  • job rotation
  • progressive discipline; and
  • competent supervision

Personal Protective Equipment includes;

  • hard hat & work boots
  • gloves, sleeve protectors, aprons & coveralls
  • respirators
  • hearing protection
  • safety glasses, chemical goggles & splash shields
  • reflective vests & work wear; and
  • insulated or breathable work wear

Priority should be given to attempts that control hazards at the source using engineering controls while ensuring the very last type of control to consider is P.P.E. at the worker. This is true because should the P.P.E. fail, nothing is left in place to protect the worker from the hazards. The best case scenario would include the implementation of multiple controls implemented with a variety of backup controls in place should any one layer of protection fail.  An example of multiple controls for an environment such as a hazardous storage room may include but are not limited to;

  • fixed gas monitors within the room to continuously sample air set to alarm when certain values are reached
  • monitoring station located outside of the chemical storage room that receives data from fixed monitors located inside of the storage room
  • fire extinguishing systems within the chemical storage room having controls located on the outside
  • air exchange systems with scrub filters that recycle or clean ambient air
  • cameras located within the storage room that are monitored by security
  • windows leading into the room for visual assessments prior to entry
  • locking doors to permit unauthorized entry
  • signage that indicates a restricted area
  • hazardous chemical training for all workers authorized to enter the storage room
  • emergency response teams on standby when a worker enters the room
  • self-contained breathing apparatus available to rescue workers
  • policy and safe work procedures for assessing and controlling additional hazards
  • personal air monitors to be worn by all workers entering the storage area
  • schematic drawing provided and reviewed by members of the local fire department so they know what is being stored and its location; and
  • chemical inventory process to document, update and track chemical inventories within the room

Control Evaluation

Once hazard controls have been implemented they must be evaluated to determine their effectiveness and to assess if the intent of the control is being met.  It is important that hazard control recommendations do not inadvertently introduce a subsequent hazard while taking steps to eliminate, reduce or control another. An example of this would include the introduction of anti-fatigue or ergonomic floor mats that are located at work stations throughout the plant. A slip and trip hazard may be inadvertently introduced and must be considered prior to implementation.

During an evaluation, members can determine the effectiveness of controls by;

  • interviewing workers affected by the control
  • monitoring air quality, production values and quality control
  • observations of safe work procedures
  • reviewing accident and incident reports (pre/post control); and
  • comparing equipment diagnostics (pre/post control)

Committee members need to determine how a hazard control can be evaluated long before it is implemented. A good idea for a hazard control must be accompanied by a quantifiable methodology that will help to determine if the hazard control is meeting or exceeding the goals.  Committee members need to consider;

  • How will the control be implemented?
  • What is the schedule for implementation and is it based on the hazard classification in an attempt to control the most serious hazards first?
  • What is the feedback mechanism for evaluation?
  • What is an acceptable result? (behaviours, production outputs, waste management, etc)
  • Have we considered an alternative control if this one doesn’t work?


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