GPT cleaning works
03 · Methodologies

Every clean follows a documented, site-specific method — not a shortcut.

Before crews mobilise, Renew produces a written method statement for the asset: access, traffic, plant, tides, WHS and environmental controls, then a step-by-step cleaning sequence. Consistency is what makes maintenance auditable — and what the current standard is missing.

Anatomy of a method statement

Seven controls, applied to every asset.

01

Site Establishment & Access

Hardstand access, bollard keys, exclusion fencing and site layout — scheduled around low-traffic windows.

02

Traffic & Pedestrian Management

Traffic management plans and permits, with exclusion zones to keep the public clear of open assets.

03

Plant & Equipment

A resource-allocation table matches the right vacuum trucks, crane trucks and crew to the asset — QEST-resourced.

04

Tidal & Environmental Influence

Tidal submergence and backflow assessed per site; works timed to the low-tide window for safe entry.

05

WHS Obligations

Site-specific SWMS/SOP, confined-space entry permits, gas detection, and fall-arrest for open-edge works.

06

Environmental Obligations

A site-specific Environmental Management Plan governs containment, disposal and waterway protection.

07

Cleaning Methodology

The step-by-step cleaning sequence — arrival, isolation, cover removal, vacuum extraction of sediment and pollutants, screen/basket servicing, reinstatement and demobilisation — captured and reported against, so Council sees the work that was done.

Worked example

Appel Park CDS3018 — a tidal GPT clean.

Asset number
4000010069
Model
CDS3018
Location
Appel Park, Surfers Paradise
Unit capacity at inspection
Basket 75% full · 400 mm sediment
Tidal — outlet permanently submerged

The outlet discharges into the Nerang River and is permanently tidally submerged, with a tide-gate valve to restrict backflow. Works are booked for night works at the lowest tide, starting as the tide drops to give at least a five-hour low-tide window — in this scenario a 0.23 m level, leaving ~300 mm of water in the outlet pipe.

Hardstand access is available for the crane truck adjacent to the GPT, with kerbside shoulder on Ferny Ave for vehicle movements. An exclusion zone is fenced around the asset for the duration of works.

Cleaning sequence
1Mobilise at low tide; isolate site and establish exclusion fencing.
2Remove access covers under fall-arrest; conduct confined-space risk assessment.
3Vacuum-extract sediment and pollutants from screening chamber and sump.
4Service removable basket; inspect screens and internals.
5Reinstate covers, demobilise, and log the visit in Assetlogue with photos.
Open in browser → Download DOCX ↓ Includes resource-allocation table, SWMS/SOP and site-specific EMP.
Methodology library

Two service profiles, real site scenarios.

SP1 covers standard GPT cleaning; SP2 covers specialist assets — grease traps and onsite treatment facilities. Each has its own documented method.

SP1 — Standard GPT cleaning
SCENARIO 1 · CDS3018

John Laws Park

Goodwin Tce, Burleigh Heads, QLD

Tidal (Seaway 0.32 m), no penstock valve. Removable bag 100% full, 550 mm sediment. Night works, 10 carparks cordoned.

SCENARIO 2 · CDS3018

Appel Park

Ferny Ave, Surfers Paradise, QLD

Outlet permanently submerged into Nerang River, tide-gate valve. Basket 75% full, 400 mm sediment. Crane-truck access.

SCENARIO 3

Broad Street / Marine Parade

Labrador, QLD

Standard GPT cleaning method with site-specific access, traffic, WHS and environmental controls.

SP2 — Specialist assets
SCENARIO 1 · GREASE TRAP

Pratten Park

Broadbeach, QLD — BBQ grease trap

Specialist cleaning method for a park BBQ grease trap, with containment and disposal controls.

SCENARIO 2 · OTF SEPTIC

Arthur Earle Park

Nerang, QLD — onsite treatment facility

Septic onsite-treatment-facility servicing with confined-space and environmental protocols.

For Geelong

Every Greater Geelong asset would receive its own site-specific method statement before works — consistent, safe and auditable.