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Simulated workplace
Scenario · Networks and Maintenance

Respond to and repair the Wyndham Street main break

You are a network maintenance operator on the Reyes crew.

Entry3 to 4 hours8 tasks
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The situation

What has happened

A priority 1 break on the 150 millimetre cast iron main in Wyndham Street has been logged by the control centre with water across the road and 38 properties likely to lose supply. The crew arrives to find water flowing from a circumferential crack, a bus stop and a cafe within the exclusion area, and the utility plans showing a telecommunications conduit and a gas main nearby. The excavation will be about 1.7 metres deep. The main will be open for several hours and there is a sewer in the same street. The Networks Manager expects the procedure to be followed step by step and the records completed before the crew leaves site.

Your brief. Respond to the break with the crew, report to the control centre, isolate the main with the smallest customer impact, excavate safely under permit, repair the main, disinfect and return it to service with the required residual and sample, and complete the work order and permit records.
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Tasks

Deliverables

  • Pre-excavation controls checklist
  • Updated work order with isolation, repair and return to service records
  • Excavation permit in the register, issued and closed
  • Water Quality Sampling Register entry

Documents to use

Systems to use

Network Work Orders

Tracks every reactive and planned job on the water and sewer networks, plants, storages and channels from dispatch to completion.

Permit to Work Register

Records every confined space entry, excavation, hot work and isolation permit with the permit holder, controls, gas readings and close-out.

Water Quality Sampling Register

Records operational and verification samples, laboratory results and the result status for drinking water, recycled water, effluent and raw water.

For trainers and assessors

Units of competency

Current on training.gov.au for the National Water Training Package as at 10 September 2026.

NWPNET051Monitor and operate water distribution systems
NWPNET029Locate, identify and protect utilities
NWPNET019Prepare and restore worksite
NWPNET018Disinfect network assets
NWPGEN023Use maps, plans, drawings and details

Qualifications

NWP20122Certificate II in Water Industry Operations
NWP30222Certificate III in Water Industry Operations
Assessor notes

What to look for

Evidence guide

Check that the student reports to the control centre before isolating, keeps the isolation to the smallest area, locates and potholes services before machine excavation and raises the permit before the trench exceeds 1.5 metres. The disinfection and sampling steps must follow the procedure, with the reason for the bacteriological sample stated. Records across the work order, permit and sampling register must be consistent.

The student's evidence summary lists every record they created or changed in the systems named above, their notes and the tasks they ticked. Verify it against the deliverables and your own assessment tool.