Elements and Performance Criteria

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, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Organisational or legislative requirements may include:
organisational performance quality standards
standard operating procedures
quality assurance guidelines
federal, state and local environmental and water quality legislation
occupational health and safety requirements
water quality standards and guidelines
Processes may include:
slow granular media filters
conventional granular media filters
pressure and gravity granular media filters
Manufacturers' and plant designers' specifications may include:
filtration rates
backwash rate and time
air scour rate and time
media profile
media depth
blower capacity
filter aid addition
intended plant configuration
Incoming water quality may include:
turbidity
colour
presence of algae
temperature
Testing may include:
turbidity
true colour
filter run profile
particle counting
headloss
media expansion rates
solids retention profile
Plant components may include:
valves
blower
wash water troughs
under drain system
nozzles and air scour components
control systems
filter cell
surface washers
turbidity meter
particle counter
Media status may include:
regularity of surface
media profile
media depth
media uniformity
solids retention profile
presence of contaminants
Potential changes to operational processes may include:
backwash rates, times and sequence
filtration rates
air scour rate and time
filter aid addition
storage of offline filters

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.
Critical aspects for assessment and evidence required to demonstrate competency in this unit
The candidate should demonstrate the ability to evaluate and report on system performance and process quality control including:
reviewing existing filtration process performance with reference to historical data, initial specifications and differences in incoming water quality
identifying data deficiencies and organising additional data collection through appropriate sampling and testing
assessing faults and incident reports and investigating the status of filtration plant components and media
investigating potential changes to filtration operational processes to identify possible optimisation strategies
planning trials to test the performance of the determined filtration optimisation options and compiling reports making recommendations
Context of and specific resources for assessment
Access to the workplace and resources, including:
documentation that should normally be available in a water industry organisation
relevant codes, standards and government regulations
Where applicable, physical resources should include equipment modified for people with disabilities.
Access must be provided to appropriate learning and assessment support when required.
Assessment processes and techniques must be culturally appropriate, and appropriate to the language and literacy capacity of the candidate and the work being performed.
Validity and sufficiency of evidence requires that:
competency will need to be demonstrated over a period of time reflecting the scope of the role and the practical requirements of the workplace
where the assessment is part of a structured learning experience the evidence collected must relate to a number of performances assessed at different points in time and separated by further learning and practice
a decision of competence only taken at the point when the assessor has complete confidence in the person's competence over time and in various contexts
all assessment that is part of a structured learning experience must include a combination of direct, indirect and supplementary evidence
where assessment is for the purpose of recognition (RCC/RPL), the evidence provided will need to be authenticated and show that it represents competency demonstrated over a period of time
assessment can be through simulated project-based activity and must include evidence relating to each of the elements in this unit
In all cases where practical assessment is used it will be combined with targeted questioning to assess the underpinning knowledge. Questioning will be undertaken in a manner appropriate to the skill levels of the operator and cultural issues that may affect responses to the questions, and will reflect the requirements of the competency and the work being performed.