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 provide evidence of:

evaluating and documenting design parameters, including client, regulatory, manufacturer and Australian and New Zealand standard requirements for a range of grey water re-use systems

planning and detailing system components, including:

holding tanks

indexing valves

piping systems

pumpwells

designing and sizing a grey water re-use system

preparing plans for a range of grey water re-use systems to industry standards

preparing specifications for a grey water re-use system

preparing testing and commissioning schedules

preparing operation and maintenance manuals.

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.

Required skills

Required skills for this unit are:

applying design concepts and principles relating to hydraulic systems

communication skills to:

communicate with others to ensure safe and effective work practices

confirm job specifications and client requirements

enable clear and direct communication, using questioning to identify and confirm requirements, share information, listen and understand

read and interpret:

plans, specifications, drawings and design briefs

standards and manufacturer requirements and manuals

statutory and regulatory requirements

use language and concepts appropriate to cultural differences

use and interpret non-verbal communication, such as hand signals

written skills to prepare documentation, including:

operation and maintenance manual

plans, specifications and schedules

innovation skills to develop creative and responsive approaches

numeracy skills to:

apply measurements and calculations

interpret data

planning and organisational skills to:

research, collect, organise and understand information relating to the design of grey water re-use systems in sewered areas

take initiative and make decisions

problem solving skills to analyse requirements, consider options and design an appropriate system.

Required knowledge

Required knowledge for this unit is:

Australian and New Zealand standards, manufacturer specifications, Building Code of Australia (BCA) and other applicable codes or standard operating procedures relevant to the sector

hazards associated with devices and systems used in the hydraulic sector

installation methods used in hydraulic systems

nature of materials and effect of their performance in a variety of conditions

OHS and organisational quality procedures and processes

principles of technology in the design of grey water re-use systems for all classes of building

terminology and definitions used in hydraulic design

work drawings and specifications

workplace safety requirements, including relevant statutory regulations, codes and standards.

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:

includes:

interpretation of plans and specifications

sizing and documenting layout of grey water re-use systems for applications, including residential, commercial and industrial

may be for new projects or an existing structure being renovated, extended, restored or maintained.

Design requirements include:

architectural specifications

builder specifications

owner requirements

specialist water use applications.

Health and environmental risks include:

health risks:

abdominal pain

acute enteritis

anaemia

anorexia

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:

algal blooms

excess nutrient loads

fish kills

oxygen depletion.

Measures to protect public health 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 includes:

comparison of range of suitable treatment, disposal options, materials, system choices and disinfection options

water savings and environmental benefits compared to initial and ongoing maintenance costs.

National water programs, statutory and regulatory requirements, and Australian and New Zealand standards include:

Acts and regulations

Australian and New Zealand standard requirements, including:

AS/NZS1546 On-site domestic wastewater treatment units

AS/NZS1547 On-site domestic wastewater management

AS/NZS3500 National plumbing and drainage set

AS2200 Design charts for water supply and sewerage

BCA

local and state government policies, including group and strata titling.

Manufacturer requirements include:

material specifications

pump tables

sizing tables

technical and trade manuals.

Desktop study includes collection and interpretation of existing data for design purposes from:

architectural and building plans

council plans

developer plans

manufacturers' data

other documents, including:

applications

brochures

forms

policies

other reports as available.

Performance requirements include:

compliance limits for:

bacteria levels

chlorine levels

nutrients

pH

phosphates

requirements established using Australian and New Zealand standards and local authority plans, including:

cover

discharge

flow conditions

pipe grades.

Layout of pipework systems:

includes:

drainage systems

elevated pipework systems

gravity systems

pumped and rising mains

stack systems, including:

fully vented

fully vented modified

single stack

single stack modified

should not unduly affect building integrity and aesthetic appeal

should have principles of economy, serviceability, durability and fit for use applied.

Fittings, valves, indexing valves and other system components include:

bends

first junctions

inspection openings

reflux valves

traps.

Land application options include:

covered surface irrigation

shallow subsurface irrigation

surface irrigation systems open to atmospheric pressure.

Holding tanks include:

connections

pumps

sizing

switches

valves.

Gullies include:

design and installation of gullies for the collection of grey water

diversion of gullies to holding tanks or treatment systems.

Pipe size and pump duty calculations include:

determination of flow and fixture loadings

gradient calculations

interpretation of design charts and tables

pipe sizing calculations

reduced level calculations.

Pumpwell, pump and pump control requirements 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 include:

concrete

earthenware

fittings

high density polyethylene (HDPE)

low density polyethylene (LDPE)

unplasticised polyvinyl chloride (PVC-U).

Jointing methods include:

brazing

compression joints

gluing

mechanical joints

solvent cement

threading

welding.

Pipe fixings include:

anchors

bedding

bracket spacing

concrete support

corrosion protection

cover

material requirements

saddles

wall brackets.

Installation requirements include:

bedding

clipping

concrete support

installation details

jointing requirements

level of workmanship.

Plans include:

elevations

details

cross-sections

isometrics

axonometrics

schematics, which may be produced using:

computer generation

Indian ink

pencil

pigment liner

sections.

Specification includes:

bedding

clipping

concrete support

detailing of specialised components

holding tanks

jointing

manufacturer requirements

materials

workmanship.

Testing includes:

air pressure test

drainage inspection

hydrostatic test

quality assurance (QA) audit.

Commissioning schedule includes:

balancing sprinklers

flow and pressure adjustments

leak check

pump settings

system flushing.

Operation and maintenance manual includes:

check for blockages

land application compliance checks

leak detection

ongoing maintenance requirements

pump maintenance

regular inspections

surface ponding checks

system operational parameter adjustments and checks, including:

chlorine levels

dissolved oxygen

nitrates

pH

phosphates

suspended solids.