When buying hydro excavation, define what the contractor must expose or remove and what evidence must be returned. A truck rate does not by itself cover service-location work, access delays, spoil classification, disposal or reinstatement.
Cleanaway and VAC2U describe excavation using water and vacuum collection.[1][2] Their published descriptions are useful starting points for a quotation. They do not establish that the method is suitable or risk-free at your site.
Compare the published service with the actual work package
Cleanaway
Cleanaway advertises hydro excavation within its industrial services and describes collecting excavated material for handling and disposal.[1] Ask the proposed branch to identify the crew, equipment, travel area, disposal destination and supporting waste records for your job. A company’s broad waste-service offering does not prove that a particular facility accepts your material.
VAC2U
VAC2U’s hydro-excavation explanation describes water loosening soil and vacuum collection of the resulting slurry.[2] Confirm coverage at the project address, the planned equipment and who handles locating, traffic management, spoil transport and reinstatement. The method description does not establish a guaranteed production rate or maximum workable depth for your site.
The reviewed pages do not provide a complete like-for-like project price or independently measured damage rates.[1][2] Avoid comparing unsupported claims such as safest, damage-free or guaranteed depth.
Assign underground-service responsibilities
SafeWork NSW’s excavation guidance addresses obtaining current essential-service information, providing it to people carrying out the work and preparing a site-specific safe work method statement before high-risk construction work starts.[3] This is NSW guidance. Confirm the applicable requirements with the regulator for the state or territory where your project is located.
The quotation should identify who obtains plans, coordinates locating and verifies the information needed for the work. Require the contractor to state what remains uncertain and how work will be paused or referred when conditions differ from the brief. A drawing or a hydro-excavation truck should not be treated as proof that every underground service has been identified.
Write a measurable scope
- Purpose: Distinguish utility exposure, potholing, trenching, pit cleaning and removal of accumulated material.
- Locations: Provide a marked plan and identifiers for each proposed work point, plus available survey or service information.
- Access: Identify truck standing space, road or footpath occupation, overhead obstructions, hose-route restrictions and permitted working hours.
- Ground and material: Disclose known ground conditions and contamination information. Ask what additional assessment or testing may be necessary.
- Boundaries: Assign responsibility for permissions, traffic management, service-owner coordination, water supply and restoration.
For an illustrative project with several utility exposure points, request a separate completion status for each point. A daily truck docket alone may not explain which points were completed, obstructed or left unresolved.
Price spoil and downtime explicitly
Ask how the contractor measures chargeable time and material, including travel, setup, standby, water replenishment and disposal trips. Identify minimum attendance, overtime, traffic-management charges, additional labour and GST treatment.
Request the proposed receiving facility and its acceptance conditions. Establish who arranges testing where needed and how unsuitable or unexpected material changes the scope. Agree written approval for additional disposal or treatment costs. Keep weighbridge, transfer or disposal records as applicable to the agreed work and local requirements.
Specify the completion package
Request a marked plan, dated photographs and a record of completed, incomplete and inaccessible work points. If coordinates or levels are needed, state the required survey basis and who is qualified to provide them. An excavation photograph alone should not be represented as a certified utility survey.
Include the contractor’s limitations, outstanding actions, reinstatement status and relevant waste documentation. The owner should be able to reconcile the invoice with this completion record.
Select a contractor after the task, uncertainty, responsibilities and total charging basis are understood. Leave excavation pressures, exclusion distances and operating methods to the competent project team and applicable procedures; this article does not supply instructions for working around live services.
References
- Cleanaway — Hydro Excavation (cleanaway.com.au)
- VAC2U — What Is Hydro Excavation?, 10 July 2025 (vac2u.com.au)
- SafeWork NSW — Excavations and Earthmoving Plant in Construction (nsw.gov.au)
