CASE STUDY 1

CIVIL ENGINEERING DEPARTMENT CLO MARKS
DUW10012 – OCCUPATIONAL SAFETY AND HEALTH 2 30

DIPLOMA IN GEOMATICS / JUNE 2020 TOTAL

CASE STUDY 1

NAME : _____________________________________ REG. NO. : _____________________________________

TOPIC 4: HAZARD IDENTIFICATION, RISK ASSESSMENT AND RISK CONTROL (HIRARC)
[CLO2: PLO8:CLS5: A3]

DIRECTION: Answer all question

HIRARC is a compound word which is made up of three consecutive activities running one after the other.
The activities consist of Hazard Identification, Risk Assessment and Risk Control. HIRARC is done to
determine the type of activity which then identifies the hazard source so that the risk of accidents is
obtained, then the risk control is performed to reduce the hazard exposure on each work activity

Based on Figure 1.0, identify and explain FIVE (5) categories of hazard in order to ensure working
environment always in a conducive condition. Please circle with RED pen on picture of the hazard and
use form in appendix 1 to conduct the analysis on HIRARC. You may use additional form if necessary.

Figure 1.0 (30 marks)

Prepared by: Verified by:

Figur

re 1.0

Company HIRA
Location
Cause and effect Exist
Process from the hazard contro
Approved by:
(Name, designation, date)

Hazard Identification

No. Work Activity Hazard

Appendix 1

ARC FORM

Conducted by:
(Name,
Designation, Date)

Review Date

Next Review Date

Risk Assessment Risk Control

ting risk Likelihood Severity Risk Recommended Person in
ol (if any)
control charge (due
measures date/status)

Likelihood Severity

Most likely Catastrophic
Possible Fatal

Conceivable Serious
Remote Minor
Negligible
Inconceivable

1.0 Likelihood of an occurrence

Likelihood is defined as how often and how possible an incident could happen. You may ask the question such
as “How many times has this event happened in the past?”. The determinant of the level is usually referring to
past experience and past incidents reported based on worker’s experience, analysis or measurement. Likelihood
level range from “Most likely” to “Inconceivable”. Table A indicates likelihood using the following values:

Likelihood (L) Table A: Likelihood Rating
Most Likely 5
Possible Example 4
Conceivable The most likely result of the hazard/event being realized 3
Remote Has a good chance of occurring and is not unusual 2
Inconceivable Might occur at some time in the future 1
Has not been known to occur for many years
Is practically impossible and has never occurred

2.0 Severity of hazard

Severity can be divided into 5 categories. Severity are based upon an increasing level of severity to an
individual’s health, the environment, or to property. Table B indicate severity using the following values:

Table B: Severity

Severity (S) Occurrence Rating
Catastrophic 5
Numerous fatalities, irrecoverable property damage and
Fatal productivity. 4

Serious Approximately one single fatality and/or major property 3
Minor damage if hazard is realized. 2
Negligible Non-fatal injury, permanent disability 1

Disabling but not permanent injury
Minor abrasions, bruises, cuts, first aid type injury

3.0 Risk Assessment

Risk assessment can be presented in a variety of ways to show the results of analysis in order to make a decision
on risk control. For risk analysis that uses likelihood and severity in qualitative method, presenting the results
in a risk matrix is a very effective way of communicating the distribution of the risk in a workplace. Risk can be
calculated using the following formula:

L x S = Relative Risk
Where:

L = likelihood
S = Severity

Table C: Risk Assessment Matrix
SEVERITY

LIKELIHOOD 12 3 4 5
5 25
4 5 10 15 20 20
3 15
2 4 8 12 16 10
1 5
3 6 9 12

24 6 8

12 3 4

The indicator of the risk assessment shows the which action need to be taken. Each task or activity will obtain a
relative risk number by determining the likelihood and severity. The results are then compared to the risk
assessment matrix to indicate whether the hazard is high, medium or low risk. The summary of risk assessment
indicators and suggested action will be explained in Table D.

Table D: Risk Assessment Indicators and Suggested Action

Risk Indicator Suggested Action
HIGH (15-25)
MEDIUM (5-14) Requires IMMEDIATE ACTION to control the hazard using hierarchy of control.
Actions taken must be DOCUMENTED (risk assessment form), including date for
LOW (1-4) completion.
Requires a PROPER risk control plan to control the hazard and to apply temporary
measures if required. Actions taken must be DOCUMENTED (risk assessment form),
including date for completion.

Further REDUCTION MAY NOT BE NECESSARY. However, if the risk can be resolved
quickly and effectively, control measures SHOULD BE implemented and recorded