Occupational hygiene basically refers to the prevention of ill health that may arise from work conditions.

Noise Surveys

Geozone conducts comprehensive noise surveys in accordance with the SANS 10083-2004 – as required by the Noise Induced Hearing Loss Regulations (Occupational Health & Safety Act: Act No 85 of 1993).

In addition, ambient noise surveys are conducted in accordance with the requirements of SANS 10328:2003 and SANS 10103:2003.

Airborne Contaminant Surveys

Geozone is able to conduct air sampling surveys of worker personal exposure to airborne contaminants in accordance with Regulation 6 of the Hazardous Chemical Substances Regulations (OHSAct) and HSE Guidance Note EH42. Internationally accepted sampling methodologies which are in full compliance with legislative requirements have been implemented.

Ventilation Surveys

Geozone can assess the effectiveness of Local Exhaust Ventilation (LEV) systems by measuring the face velocities and capture velocities generated by these systems. The results are compared to the minimum requirements as stipulated in the Occupational Health and Safety Act (Act 85 of 1993) and to recognised ventilation standards as published by the American Conference of Governmental Industrial Hygienists (ACGIH).

Illumination Surveys

Geozone conducts illumination surveys in accordance with SANS 10114-2004 National Standard for Interior Lighting as incorporated into the Occupational Health and Safety Act No 85 / 1993 – Environmental Regulation 3.

Ergonomics Risk Assessments

Geozone conducts comprehensive ergonomics risk assessments using established National Institute of Occupational Safety and Health (NIOSH) and Occupational Safety and Health Association (OSHA) guidelines. The field of ergonomics is typically all encompassing – i.e. includes all physical, chemical and ergonomic stressors to which employees may be exposed during the course of their work.

On-site ergonomics assessments are conducted during which time ergonomics checklists are completed. These checklists allow the investigator to work systematically through a detailed list of potential ergonomic stresses and note any deviations present within a particular working environment.

Indoor Air Quality Assessments

Geozone is able to conduct full assessments of Indoor Air Quality, including:

% CO2 concentration in ambient air
PM10 dust concentrations in ambient air
Relative Humidities
Ambient air temperatures
Airborne volatile organic substance concentrations (non-specific)
The findings are compared to internationally accepted Indoor Air Quality (IAQ) standards.

Thermal Stress Surveys

Geozone can conduct thermal stress (cold stress and heat stress) surveys in accordance with the requirements of Environmental Regulation 2 of the OHSAct (Act No 85 of 1993). Reference is also typically made to the American Conference of Governmental Industrial Hygienists Threshold Limit Values (TLVs) which account for the impact which clothing ensembles and worker metabolic work rates have on worker risk of exposure to thermal stress conditions.

Hazardous Chemical Substance Risk Assessments

Geozone is able to conduct comprehensive Hazardous Chemical Substances Risk Assessments in accordance with the requirements of the Regulations for Hazardous Chemical Substances as stipulated under the OHSAct (Act 85 of 1993). HCS Risk Assessments include:

The health effects (consequence) associated with exposure to each chemical substance
The potential frequency of employee contact with each chemical substance
The potential degree of employee contact with each chemical substance (risk of employee exposure)
The potential route(s) of exposure associated with each chemical substance
The suitability and effectiveness of existing control measures (including PPE)

Health Risk Assessments (HRA)

It is a requirement of the Occupational Health and Safety Act for employers to conduct health risk assessments of their workplaces. Geozone can conduct comprehensive HRA during which time cognisance is taken of all existing and potential occupational hygiene stressors – i.e:

Chemical stressors (hazardous chemical substances)
Physical stressors (noise, thermal stress, illumination)
Ergonomic stressors (manual materials handling, lifting, repetitive work)
Biological stressors (hazardous biological agents)
Using a risk rating matrix, these stressors are qualitatively evaluated based on frequency of employee exposure, duration of exposure and consequence of exposure to the stressors. The associated health risks are categorised into low, medium or high risk ratings – per activity area to allow for identification and prioritisation of the highest health risks on site. Cognisance is also taken of the following:

Existing engineering controls on site (general and local exhaust ventilation etc)
Existing administrative controls in place (job rotation, work:rest regimens etc)
Existing personal protective equipment
The appropriateness of these control measures is qualitatively assessed VV identified risks

Based on the findings of the Health Risk Assessment, recommendations are made with regard to the need to conduct follow-up quantitative occupational hygiene surveys (all as per OHSAct 85 of 1993).