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Evidence Guide: DEFPH007A - Conduct chlorine dosing of water at the point of supply

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

DEFPH007A - Conduct chlorine dosing of water at the point of supply

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare for chlorine dosing

  1. Chlorines are used, handled and stored in accordance with organisational policies and procedures
  2. Chlorine residue level is established via field water testing
  3. Chlorine residue level is compared with national drinking water guidelines and information related to chlorine concentration to determine chlorine demand
Chlorines are used, handled and stored in accordance with organisational policies and procedures

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Chlorine residue level is established via field water testing

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Chlorine residue level is compared with national drinking water guidelines and information related to chlorine concentration to determine chlorine demand

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Perform chlorine dosing

  1. Chlorine dosing is conducted in accordance with organisational policies and procedures
  2. Personal protective equipment is selected, fitted and used correctly
  3. Dosing is monitored to maintain parameters of dosing to achieve desired chlorine residue level
  4. Dosing faults are identified and acted on, in accordance with organisational policies and procedures
Chlorine dosing is conducted in accordance with organisational policies and procedures

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Personal protective equipment is selected, fitted and used correctly

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Dosing is monitored to maintain parameters of dosing to achieve desired chlorine residue level

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Dosing faults are identified and acted on, in accordance with organisational policies and procedures

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Monitor chlorine dosing performance

  1. Dosing samples are collected and field tested to confirm chlorine residue level and water quality
  2. Dosing data is collected, recorded and reported according to organisational policies and procedures
  3. Observations outside defined parameters are reported for further action
Dosing samples are collected and field tested to confirm chlorine residue level and water quality

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Dosing data is collected, recorded and reported according to organisational policies and procedures

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Observations outside defined parameters are reported for further action

Completed
Date:

Teacher:
Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessment must confirm the ability to:

handle, store and used chlorine safely

accurately calculate chlorine dosing levels

identify and respond to dosing faults.

Consistency in performance

Competency should be demonstrated over a minimum of two assessment occasions.

Context of and specific resources for assessment

Context of assessment

Competency should be assessed in an actual workplace situation. This may be in an urban or a field setting.

Specific resources for assessment

Access is required to:

appropriate equipment and stores

relevant organisational policies and procedures.

Required Skills and Knowledge

This describes the essential skills and knowledge and their level, required for this unit.

Required Skills

calculate chlorine dosing level

communicate appropriately about, consult on and impart knowledge of:

causes of disease transmission

causes of manpower wastage

control measures of disease transmission

safe water handling practices

water quality assurance measures

interpret data gathered in the field against quality standards in national water quality guidelines and organisational policy

liaise and communicate with persons in positions of authority

make technical judgements based on own level of knowledge and experience

measure chemicals accurately

prioritise tasking

work safely

Required Knowledge

aetiology of water-borne diseases

Australian Drinking Water Guidelines 2004 (National Health and Medical Research Council)

best use of available resources

causes of disease transmission

causes of manpower wastage

chlorine dosing levels per volume of water

control measures of disease transmission

documentation processes relevant to own workplace

handling and storage requirements for chlorine

health surveillance system

organisational policies and procedures

process of disease

relationship between chlorine, water pH and temperature as it relates to water disinfection

risk management principles

safe water handling practices

time management strategies to set priorities

water quality assurance measures

Range Statement

The Range Statement relates to the Unit of Competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording in the Performance Criteria is detailed below.

Point of supply may include

Trailer mounted water containers

Water distribution point

20 L water jerry cans

100 L water bladder

Organisational policies and procedures may include

Clinical standards (state/territory and national)

Codes of ethics

Codes of practice

Environmental health policy

Health and hygiene guidelines

Health surveillance policy documents

Industry professional body standards

Industry standards (state/territory and national)

Organisational health policy directives

Pesticides manual

Relevant Australian Standards

Relevant Commonwealth Acts

Workplace safety guidelines

Field water testing may include

Faecal coliform bacteria

Free chlorine level (after addition)

pH

Physical characteristics (taste, colour, odour and temperature)

Radioactivity (as ordered)

Selected poisons (if presence is suspected, normally arsenic and cyanide, and may include mustard and nerve agents)

Total coliform bacteria

Total dissolved solids (TDS)

Turbidity

Chlorine residual level

is the concentration of chlorine remaining after the chlorine oxidised and performed its disinfection

Chlorine demand

is the amount of chlorine participating in oxidation reactions during a specified contact period; chlorine in water rapidly oxidises organic matter including micro-organisms

Chlorine dosage

is the amount of chlorine added to water; dosage is expressed as a concentration, normally in terms of milligrams per litre (mg/L)

Personal protective equipment may include

Chemical resistant apron

Chemical resistant gloves

Eye protection

Dosing faults may include

Chlorine residual level too high

Chlorine residual level too low

Insufficient contact time allowed

Water pH level too high

Water temperature too high