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.
Scope of work:
must include:
interpretation of plans and specifications
sizing and documenting layout of grey water re-use systems for residential, commercial and industrial applications to include water treatment and backflow protection of drinking and non-drinking water supply systems
may be for new projects or an existing structure being renovated, extended, restored or maintained.

Design requirements must include:
architectural plans
building specifications
owner requirements
pipework identification
sizing of pipework
backflow protection of drinking and non-drinking water supply systems
water treatment
specialist water use applications.

Health and environmental risks include:
health risks, which may include:
abdominal pain
acute enteritis
bacillary dysentery
chest pain
cholera
common colds
coughing
diarrhoea
digestive and nutritional disturbances
dysentery
fever
gastroenteritis
giardiasis
helminthes, including flukes and worms
hepatitis
hookworm disease
infectious hepatitis
meningitis
muscle aches
neurological symptoms, including nervousness and insomnia
poliomyelitis
respiratory infections, such as pneumonia
restlessness
salmonellosis (food poisoning)
taeniasis
toxoplasmosis
typhoid fever
vomiting
weight loss
environmental risks, which may include:
algal blooms
excess nutrient loads
fish kills
oxygen depletion.

Measures to protect public health must include:
auditing
contact avoidance
contact minimisation
disinfection and sterilisation
education
legislation
licensing
maintenance
separation barriers
set back distances
timing discharges
wet weather storage.

Cost-benefit analysis compares:
the range of suitable materials and system choices available to enable cost-effective choices to be made without compromising integrity of project, such as suitable treatment, disposal options and disinfection options
water savings and environmental benefits compared to initial and ongoing maintenance costs.

National water programs, statutory and regulatory requirements, relevant Australian standards, and codes may include:
Acts and regulations
Australian standard requirements, including:
AS/NZS1546 On-site domestic wastewater treatment units
AS/NZS1547 On-site domestic wastewater management
AS/NZS3500 National plumbing and drainage
AS2200 Design charts for water supply and sewerage
National Construction Code
commonwealth, state or territory government policies, including health departments.

Manufacturer requirements must include:
material specifications
grey water treatment systems
pump installation
pipe sizing
storage systems
technical and trade manuals.

Desktop study may include collection and interpretation of data for design purposes in:
architectural and building plans
developer plans
manufacturer data
other documents, including:
applications
brochures
forms
policies
other reports as available.

Performance requirements may include:
compliance limits for:
bacteria levels
chlorine levels
nutrients
pH
phosphates
requirements established using relevant Australian standards, codes and local authority plans, including:
cover
discharge
flow conditions
pipe grades.

Layout of pipework systems:
may include:
drainage systems
elevated pipework systems
gravity systems
pumped and rising mains
stack systems, may include:
fully vented
fully vented modified
single stack
single stack modified
waste stack
two-pipe system
reduced velocity aerator system
should not unduly affect building integrity and aesthetic appeal
includes location of pipework (fire rating of enclosure)
should demonstrate principles of economy, serviceability, durability and fit for use.

Fittings, valves and controls must include:
backflow prevention devices
irrigation control systems
isolating valves
level indicators
pump controls.

Land application options may include:
surface irrigation
subsurface irrigation
spray irrigation.

Storage tanks may include:
connections
containment
location
material
overflow provision
pumps
sizing
support
switches
valves
vermin control.

Pipe size and pump duty calculations may include:
calculating pipe sizing
calculating pressure and flow requirements
determining flow and fixture loadings
interpreting design charts and tables.

Pumpwell, pump and pump control requirements may include:
automatic controls
capacity
corrosion-resistant materials
detailing
high and low-level water controls and alarms
inlet and outlet design requirements
installation and mounting requirements
macerator requirements
pump sizing
pumpwell sizing
selection of pump type
valve requirements
warning system.

Materials may include:
copper (Cu)
polypropylene (PP)
polybutylene (PB)
polyethylene (PE)
unplasticised polyvinyl chloride (PVC-U)
other approved material.

Jointing methods may include:
brazing
compression joints
electrofusion welding
mechanical joints
solvent cement
threading
other approved jointing methods.

Pipe supports include:
anchors
bedding
bracket spacing
concrete support
corrosion protection
manufacturer-recommended specific fixings
material requirements
provision for expansion
saddles.

Installation requirements may include:
pipe protection, which may include:
cover
corrosion
impact
fire rating
level of workmanship
manufacturer-recommended specific fixings
pipe support
provision for expansion
serviceability and access.

Sustainability principles and concepts:
cover the current and future social, economic and environmental use of resources
may include:
selecting appropriate material to ensure minimal environmental impact
efficient use of material
efficient energy usage/capital outlay comparison
local environment consideration
water efficiency
reuse of greywater
consideration of the Green Building Council of Australia rating scheme.

Plans:
may include:
axonometrics
elevations
details
cross-sections
isometrics
sections
schematics, which may be produced using:
computer generation
drawing equipment.

Specification may include:
backflow prevention
flow requirements
jointing
manufacturer requirements
materials
residual pressures
safety (WHS)
specialised components
storage
support
testing
valve selection
water treatment
workmanship.

Testing may include:
air pressure
backflow protection
defect inspection
drainage inspection
hydrostatic
performance:
flow
pressure
water quality
quality assurance (QA) audit.

Commissioning schedule may include:
balancing disposal system
flow and pressure adjustments
leak check
pump settings
pressure test
safety requirements
system certification
system flushing
system defects
system functions as per design
system purge
valve operation
ventilation
vermin control.

Operation and maintenance manual may include:
as installed drawings
certification documentation
land application compliance checks
maintenance schedules
manufacturer brochures
ongoing maintenance requirements
pump maintenance
regular inspections
results of commissioning test
safety management system
surface ponding checks
system detail, setting and operations
valve function
system operational parameter adjustments and checks, including:
chlorine levels
dissolved oxygen
nitrates
pH
phosphates
suspended solids
water quality.

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.
Overview of assessment
This unit of competency could be assessed in the workplace or a close simulation of the workplace environment providing that simulated or project-based assessment techniques fully replicate plumbing and services workplace conditions, materials, activities, responsibilities and procedures.

Critical aspects for assessment and evidence required to demonstrate competency in this unit
A person who demonstrates competency in this unit must be able to, as a minimum, provide evidence of the ability to:
design, size and document the layout details, including a specification for a high-rise mixed development building and a wide span project, such as a school or industrial complex, including:
evaluating and documenting design parameters, including client, regulatory, manufacturer and relevant Australian standard code requirements for a range of grey water re-use systems
planning and detailing system components, including:
storage tanks
system overflow
treatment systems
piping systems
plumbing systems
usage systems
designing and sizing a grey water reuse system
preparing plans and specifications for a range of grey water reuse systems to industry standards
preparing testing and commissioning schedules
preparing operation and maintenance manuals
applying sustainability principles and concepts throughout the system design
communicating with others to ensure safe and effective work site operations.

Context of and specific resources for assessment
This competency is to be assessed using standard and authorised work practices, safety requirements and environmental constraints.
Assessment of essential underpinning knowledge will usually be conducted in an off-site context.
Assessment is to comply with relevant regulatory or Australian standards’ requirements.
Resource implications for assessment include:
an induction procedure and requirement
realistic tasks or simulated tasks covering the minimum task requirements
relevant specifications and work instructions, including design brief drawings, specifications, codes, design concepts and construction schedules
tools and equipment appropriate to applying safe work practices, including computers, software and calculators
workplace instructions relating to safe working practices and addressing hazards and emergencies
material safety data sheets
research resources, including industry-related systems information.
Reasonable adjustments for people with disabilities must be made to assessment processes where required. This could include access to modified equipment and other physical resources, and the provision of appropriate assessment support.

Method of assessment
Assessment methods must:
satisfy the endorsed Assessment Guidelines of the Construction, Plumbing and Services Training Package
include direct observation of tasks in real or simulated work conditions, with questioning to confirm the ability to consistently identify and correctly interpret the essential underpinning knowledge required for practical application
reinforce the integration of employability skills with workplace tasks and job roles
confirm that competency is verified and able to be transferred to other circumstances and environments.
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, with a decision on competency only taken at the point when the assessor has complete confidence in the person's demonstrated ability and applied knowledge
all assessment that is part of a structured learning experience must include a combination of direct, indirect and supplementary evidence.
Assessment processes and techniques should as far as is practical take into account the language, literacy and numeracy capacity of the candidate in relation to the competency being assessed.
Supplementary evidence of competency may be obtained from relevant authenticated documentation from third parties, such as existing supervisors, team leaders or specialist training staff.