Industrial Washbay Drainage & Stormwater Installation in Moorooka, QLD
Client: Food Manufacturing Facility based in Moorooka, Queensland
For food manufacturing facilities, a washbay that generates contaminated waste water with nowhere compliant to go is not just an operational inconvenience. It is an environmental liability that can attract investigations under Queensland’s environmental protection framework, trigger trade waste approval reviews, and in serious cases, shut a site down. The longer it goes unaddressed, the bigger the risk.
That was the situation at a food manufacturing facility in Moorooka, Queensland. Daily washdown operations were generating significant volumes of contaminated runoff, but the site had no dedicated industrial washbay drainage system to manage it. No stormwater capture, no pre-treatment infrastructure, and no compliant pathway to the sewer. The facility needed a solution before the problem escalated.
The project that followed covered everything from concrete scanning and excavation through to a complete internal plumbing fit-out, stormwater drainage installation, and preparation for a future oil water separator installation.
Project Overview
This was not a simple drainage job. The facility needed a complete system built from scratch, one that could handle daily washdown volumes, connect compliantly to the sewer network, and set the site up for a future oil water separator installation without having to redo the groundworks.
The scope covered external drainage infrastructure and a full internal plumbing fit-out, including integration with the facility’s existing holding tank. The facility remained operational throughout. This required careful planning and staging of every work phase around production schedules. The team completed concrete scanning across the washbay area before beginning any excavation.
Key project objectives included:
Installation of a dedicated industrial waste water drainage system for washdown operations
A compliant stormwater drainage installation to capture and manage surface runoff
Core drilling and integration with the existing holding tank
Drainage infrastructure prepared and ready for oil water separator installation
Internal drainage within the equipment cleaning area including a stainless steel bucket trap
Cold water supply lines for washdown hose positions across the washbay
Backflow prevention to protect the potable water supply throughout the facility
Challenges
The washbay was operating without a dedicated industrial waste water drainage network. There was no compliant pathway for washdown runoff, no stormwater capture system, and no pre-treatment infrastructure in place to manage contaminants before discharge. In a food manufacturing environment, that combination creates risk on multiple fronts at once.
Key issues included:
No dedicated industrial waste water drainage system for washdown operations
No compliant stormwater drainage installation to capture surface runoff
No connection between the washbay and the facility’s existing holding tank
Infrastructure required to support an oil water separator installation
Internal drainage required within the equipment cleaning area
Backflow prevention required to protect the potable water supply
Under theEnvironmental Protection Act 1994 (Qld), facilities have a general environmental duty to take all reasonable and practical measures to prevent environmental harm. For a food manufacturing facility generating contaminated washbay runoff, that means having compliant pre-treatment and drainage infrastructure in place before that waste water reaches any stormwater or sewer network.
Working Around an Active Facility
One of the most demanding parts of this job was that the facility could not stop. Every stage of the works had to fit around ongoing production without disrupting operations or creating safety risks on site. Before excavation began, the team scanned the entire washbay area to locate underground services including electrical conduits, water lines, and existing drainage infrastructure.
This step is non-negotiable on jobs like this. Cutting into an unidentified service inside an active food manufacturing environment creates the kind of incident that shuts a site down instantly. With underground services fully mapped, the team was able to safely core drill into the existing holding tank and begin ground preparation, all while keeping the facility operational throughout.
What Was Delivered
The completed project covered both the external drainage network and the internal plumbing works required to bring the washbay up to a fully operational and compliant standard.
External Drainage and Stormwater Infrastructure
The external works established the primary drainage network responsible for capturing washbay runoff and directing it through approved systems. Works completed included:
Concrete scanning across the washbay area prior to excavation
Core drilling into the existing holding tank to integrate the new drainage system
Excavation and ground preparation for drainage pipework and pits
Installation of trade waste pipework connecting tanks and drainage pits
Venting of the drainage system to atmosphere
Installation of a new sewer connection behind the washbay area
Installation of a stormwater drainage system connecting to the local stormwater network
Drainage infrastructure designed to capture runoff from the washbay diversion pit
Removal of all excess spoil generated during excavation works
The stormwater drainage installation was designed in line with theAustralian Guidelines for Urban Stormwater Management, which provide a nationally consistent framework for managing stormwater in an ecologically sustainable manner. The system safely directs captured runoff away from operational areas and surrounding environments before it reaches the local stormwater network untreated.
Oil Water Separator Preparation
A critical element of the external works was configuring the drainage infrastructure to support a futureoil water separator installation. Washbay environments require oil water separators when runoff contains hydrocarbons, oils, or other substances that need pre-treatment before sewer or stormwater discharge.
Getting the pipework and diversion pit configuration right at this stage matters. Retrofitting separator infrastructure into a drainage system that was not designed for it is significantly more expensive and disruptive than building it in from the start. The drainage pipework and diversion pit were designed and installed to integrate directly with the separator, giving the facility a compliant and future-ready pathway for managing contaminated washbay runoff without needing to revisit the groundworks.
A hose tap was also installed adjacent to the oil water separator location to allow the separator and surrounding infrastructure to be cleaned and serviced during routine maintenance.
Internal Drainage and Plumbing Works
Alongside the external network, ourcommercial drainage plumbing team completed the internal works to ensure the equipment cleaning area was properly equipped for safe washdown operations:
Installation of a 150mm stainless steel bucket trap within the equipment cleaning area
Installation of new cold water supply lines for washdown hose positions across the washbay
Installation of a hose tap adjacent to the oil water separator location
Installation of backflow prevention valves on water lines serving washdown hose reels, the diversion pit, and hose taps used for equipment cleaning
The stainless steel bucket trap is worth calling out specifically. Positioned at the point of source, it captures food solids and debris before they travel into the drainage line. As a result, this protects the wider industrial washbay drainage system from premature blockage. Additionally, it extends the time between maintenance interventions significantly. It is a simple yet effective measure that enhances the system’s performance over time.
Backflow Prevention and Plumbing Standards
Washbay environments use hose connections with cleaning chemicals and contaminated water. Protecting the potable water supply is non-negotiable. The team installed backflow prevention valves across all water supply points serving the washbay. These valves stop pressure fluctuations from pushing contaminated water back into clean supply lines.
All commercial drainage plumbing was delivered in accordance with theNational Construction Code Volume Three, Plumbing Code of Australia, which sets the minimum standards for compliant plumbing and drainage installations across industrial and commercial facilities in Australia.
Final Outcome
The project was completed on schedule, delivering a purpose-built industrial washbay drainage system that supports the facility’s daily washdown operations safely and in full compliance with Queensland environmental and plumbing standards.
A purpose-built industrial washbay drainage system designed for daily washdown operations
A compliant stormwater drainage installation managing surface runoff from the washbay area
Reliable trade waste plumbing services supporting compliant waste water management
Improved drainage infrastructure connected to approved sewer systems
Dedicated cold water supply points for cleaning and maintenance operations
Backflow protection across all washbay water supply lines
Infrastructure in place to support a future oil water separator installation, giving the facility a clear compliance upgrade path
The bigger picture here is straightforward. A food manufacturing facility generating contaminated washbay runoff without a compliant system is sitting on a growing liability. Every day it goes unaddressed, the risk increases. Contaminated discharge into stormwater or sewer networks can trigger investigations under Queensland’s environmental protection framework. It can also prompt trade waste approval reviews—and in serious cases, operational shutdowns. Getting the infrastructure right from the start is the most cost-effective decision a facility manager can make. This project shows what that looks like when you do it properly.
Your Washbay Drainage Gap Is a Compliance Risk You Can’t Ignore
If your facility is generating washdown waste water without a compliant system to manage it, the question is not if it becomes a problem but when. Citi Industries knows how to close that gap, and how to do it without shutting your facility down.
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