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. |