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, as a minimum, evidence of the ability to:

design, size and document the installation and layout details for a trade waste pre-treatment system, including a specification for two of the following:

commercial kitchen

vehicle mechanical workshop

commercial laundry

metal plating process

evaluate and document design parameters to relevant Australian standards, codes, client information, local authorities’ trade waste policy, and manufacturer installation requirements

evaluate health risks associated with the trade waste system

plan and detail system components, including pre-treatment systems and piping systems

design and size trade waste systems

design and size wash-down and stormwater exclusion systems

prepare plans and specifications for the trade waste pre-treatment installations to industry standards

prepare schedules for testing and commissioning

produce operation and maintenance manuals

apply sustainability principles and concepts throughout installations

communicate with others to ensure safe and effective workplace 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.

Required skills

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

use language and concepts appropriate to cultural differences

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

initiative and enterprise skills to develop creative and responsive approaches

literacy skills to:

prepare written documentation, including:

operation and maintenance manual

plans, specifications and schedules

read and interpret:

plans, specifications, drawings and design briefs

standards and manufacturer requirements and manuals

statutory and regulatory requirements

numeracy skills to apply measurements and calculations

planning and organising skills to:

research, collect, organise and understand information relating to the design of trade waste pre-treatment systems

take initiative and make decisions

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

teamwork skills to work with others to action tasks and relate to people from a range of cultural and ethnic backgrounds and with varying physical and mental abilities

technical skills to recommend general housekeeping procedures to minimise trade waste

technology skills to:

access and understand site-specific instructions in a variety of media

use mobile communication technology

Required knowledge

relevant Australian standards, codes, manufacturer specifications, National Construction Code (NCC), relevant authorities’ requirements and operating procedures relevant to the sector

hazards associated with devices and systems used in the hydraulic sector

design of the options for the pre-treatment of trade waste

approved installation methods for trade waste pre-treatment systems

key features of work plans and specifications

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

organisational quality procedures and processes

terminology and definitions used in hydraulic design

work health and safety (WHS) 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:

must include:

interpreting plans and specifications

sizing and documenting layout of trade waste pre-treatment systems for commercial and industrial applications

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

Design requirements must include:

architectural plans

building specifications

cleaning and maintenance procedures

installation requirements

odour control

owner requirements

pipework identification

sizing

trade waste treatment

ventilation.

Statutory and regulatory requirements and relevant Australian standards and codes may include:

AS/NZS3500 National plumbing and drainage

AS2200 Design charts for water supply and sewerage

commonwealth, state or territory and local governments requirements

National Construction Code

other relevant Australian standards and codes.

Trade waste applications may include:

chemical facilities

commercial and industrial facilities that produce a liquid waste stream

commercial and industrial laundry

food preparation facilities

laboratories

motor vehicle workshops

photography development facilities

wash-down facilities.

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

may include:

design styles

energy costs

expected design life

labour costs

material costs

safety factors

speed of installation

suitable materials

authorities’ requirements.

Manufacturer requirements may include:

containment

design and installation

installation space

material specifications

pipe sizing

pump installation

storage systems

technical and trade manuals

ventilation.

Desktop study may include collection and interpretation of existing data for design purposes in:

architectural and building plans

developer plans

manufacturer data

documents, which may include:

applications

brochures

forms

policies

other reports as available

trade waste publications.

Performance requirements must:

establish acceptable discharge standards for the relevant authority

comply with relevant Australian standards, codes and local authorities’ requirements.

Layout of pipework systems:

may include:

location of pipework (fire rating of enclosure)

trade waste plumbing and drainage

pumped systems

accessibility

should not unduly affect building integrity and aesthetic appeal

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

Fittings may include:

bends

junctions

reflux valves

inspection openings

expansion joints.

Solid removal systems may remove:

bone

dirt

grit

metal

paper

plastic

rubbish

sand

silt

wood

other solid contaminants.

Grease and oil interceptors may include:

coalescing plate separators

dissolved air flotation (DAF)

grease traps

skimmers

vertical separators.

Neutralising chambers may neutralise:

acid

alkaline

chemicals.

Wash-down areas may include:

bin

commercial and industrial wash-down processes that may or may not require stormwater diversion

floor

vehicle

machinery.

Bacterial treatment processes may include:

aerobic

anaerobic

facultative and specialised bacteria for the removal of grease and other contaminants.

Combined and specialised treatment processes may include:

bacterial treatment

cooling pits

diffused air flotation systems

neutralising chambers

solid removal systems

specialised treatment.

System calculations must include:

calculating gradient

interpreting design charts and tables

calculating pipe sizing

calculating reduced level

determining flow and fixture loadings

sizing treatment system

storage tank capacity.

Pumpwell, pumps, controls and equipment requirements may include:

access covers

automatic controls

capacity

chains

corrosion-resistant materials

detailing

emergency storage

high and low-level water controls and alarms

impeller sizing

inlet and outlet design requirements

installation and mounting requirements

ladder access

odour control

macerator requirements

pump selection

pump sizing

pumpwell sizing

space requirements

step irons

valve requirements

ventilation

warning system.

Pipe supports include:

anchors

bedding

bracket spacing

concrete support

corrosion protection

cover

hanging brackets

manufacturer-recommended specific fixings

material requirements

saddles

provision for expansion

wall and ceiling brackets.

Materials may include:

pipes may include:

cast iron or epoxy lined

earthenware or vitrified clay pipe (VCP)

polyethylene (PE)

polypropylene (PP)

other approved material

fittings and fixtures, including sound attenuation requirements.

Jointing methods may include:

electrofusion welding

mechanical joints

rubber ring

threading.

Installation requirements may include:

bedding

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.

Computer software packages include:

proprietary design software

manufacturer software.

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

effect on the environment due to overflow or leakage

material selected to convey the type of discharge

water efficiency.

Plans:

may include:

axonometrics

cross-sections

details

elevations

isometrics

schematics

sections

may be produced using:

computer generation

drawing equipment.

Specification may include:

access chambers (manholes)

bedding

commissioning

concrete support and detailing specialised components

jointing

manufacturer requirements

materials

pumps

safety (WHS)

support

testing

workmanship.

Testing may include:

air pressure

compliance with authorities’ discharge requirements

drainage inspection

hydrostatic

performance

quality assurance (QA) audit.

Commissioning schedule may include:

checking for foreign material

checking system defects

checking that system functions as per design

containment

leak check

operational commissioning

pump commissioning

system certification

treatment system commissioning.

Operation and maintenance manual may include:

as installed drawings

certification documentation

results of commissioning test

maintenance schedules

manufacturer brochures and technical information

odour control

regular treatment system maintenance

regular water quality testing

ventilation

water auditing.