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, trade-waste policy, regulatory, manufacturer and Australian and New Zealand standard requirements for a range of trade waste pre-treatment systems

planning and detailing system components, including pre-treatment systems and piping systems

designing and sizing trade waste systems

designing and sizing wash-down and first-flush systems

preparing plans for a range of trade waste pre-treatment systems to industry standards

preparing specifications for trade waste pre-treatment systems

preparing schedules for testing and commissioning

producing 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:

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

planning and organisational 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.

Required knowledge

Required knowledge for this unit is:

common terminology and definitions used in the design of trade waste pre-treatment systems for all classes of building

drafting principles

nature of materials used and effects of performance under various conditions

principles of technology used in the design of trade waste pre-treatment systems

requirements of state regulatory authorities, Australian standards and manufacturer specifications, including hazards identified in relation to devices and systems used

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, and sizing and documenting layout of trade waste systems, for residential, commercial and industrial applications for either new projects or existing structures being renovated, extended, restored or maintained.

Design requirements include:

architectural specifications

builder specifications

owner requirements

specialist water use applications.

Statutory and regulatory requirements and Australian and New Zealand standards include:

Acts, regulations and local and state government policies, including group and strata titling

AS/NZS3500 National plumbing and drainage set

AS2200 Design charts for water supply and sewerage

Building Code of Australia

local government trade waste policies.

Trade waste applications include:

chemical facilities

commercial and industrial facilities that produce a liquid waste stream

food preparation facilities

photography development facilities

wash-down facilities.

Cost-benefit analysis includes:

comparison of the range of suitable materials and system choices available to enable cost-effective choices to be made without compromising integrity of project.

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

forms

sewer detail maps

other reports as available.

Performance requirements include:

pipe grades, cover, flow conditions and discharge requirements, established using Australian and New Zealand standards and local authority plans.

Layout of pipework systems:

includes:

gravity systems

pumped systems

should not unduly affect building integrity and aesthetic appeal

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

Fittings and valves include:

bends

inspection openings

junctions

reflux valves

traps.

Solid removal systems include removal of:

bone

dirt

grit

metal

paper

plastic

rubbish

sand

silt

wood

other solid contaminants.

Grease and oil interceptors include:

coalescing plate separators

grease traps

skimmers

vertical separators.

Neutralising chambers include:

acid neutralisation

chemical neutralisation.

Wash-down areas include:

bin wash down

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

floor wash down

machinery wash down.

Diffused air flotation systems include:

removal of contaminants from commercial and industrial processes.

Bacterial treatment processes include:

aerobic

anaerobic

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

Combination and specialised treatment processes are any combination of processes, including:

bacterial treatment processes

diffused air flotation systems

first-flush systems

neutralising chambers

solid removal systems

specialised treatment process

stormwater diversion.

Stormwater diversion and first-flush systems include:

exclusion of stormwater from sewerage systems or admittance of first portion of stormwater generated by a rain event to the sewerage system.

System calculations include:

determination of flow and fixture loadings

gradient calculations

interpretation of design charts and tables

pipe sizing calculations

reduced level calculations

treatment system sizing.

Pumpwell, pump and pump control requirements include:

automatic controls

capacity

chains

corrosion-resistant materials

detailing

high and low-level water controls and alarms

impeller sizing

inlet and outlet design requirements

installation and mounting requirements

ladder access

macerator requirements

pump selection

pump sizing

pumpwell sizing

space requirements

step irons

valve requirements

warning system.

Pipe fixings include:

anchors

bedding

bracket spacing

concrete support

corrosion protection

cover

hanging brackets

material requirements

saddles

wall and ceiling brackets.

Materials include:

cast iron

concrete

copper

earthenware

fittings and fixtures, including sound attenuation requirements

high density polyethylene (HDPE)

unplasticised polyvinyl chloride (PVC-U).

Jointing methods include:

brazing

gluing

mechanical joints

rubber ring

solvent cement welding

threading.

Installation requirements include:

bedding

clipping

concrete support

installation details

jointing requirements

level of workmanship.

Computer software packages include:

proprietary design software

manufacturers' software.

Plans include:

axonometrics

cross-sections

details

elevations

isometrics

schematics, which may be produced using:

computer generation

Indian ink

pencil

pigment liner

sections.

Specification includes:

bedding

clipping

concrete support

detailing of specialised components

jointing

manholes

manufacturer requirements

materials

sewer admission limits

workmanship.

Testing includes:

air pressure test

drainage inspection

hydrostatic test

quality assurance (QA) audit.

Commissioning schedule includes:

charging traps

leak check

operational commissioning

pump commissioning

treatment system commissioning.

Operation and maintenance manual includes:

check for blockages

leak detection

pump maintenance

regular treatment system maintenance

regular water quality testing

water auditing

yearly maintenance requirements.