Product Overview

Summary: This Terrain Modification for Safety SOP sets out a clear, defensible process for reshaping, grading and stabilising ground conditions to eliminate or reduce WHS risks. It gives Australian workplaces a practical framework to plan, execute and verify terrain changes so that vehicle routes, work platforms, excavations and public interfaces remain stable, trafficable and safe.

Terrain modification – including grading, cutting, filling, benching and batter shaping – is one of the most critical controls for managing physical risk on Australian worksites. Poorly planned or inadequately controlled ground changes can lead to vehicle rollovers, slope failures, uncontrolled water flow, undermining of structures and serious harm to workers or the public. This Terrain Modification for Safety Safe Operating Procedure provides a structured, repeatable method to assess existing ground conditions, design safe modifications, coordinate plant and people, and verify that the resulting terrain is fit for purpose before work proceeds.

Developed for civil, construction, mining, local government and infrastructure environments, this SOP connects practical field steps with WHS due diligence requirements. It guides your team through pre-start site assessments, geotechnical considerations, safe operating envelopes for earthmoving plant, segregation of workers from mobile equipment, and controls for working near services, waterways and public areas. By implementing this procedure, organisations can demonstrate that terrain changes are not left to ad hoc operator judgement, but are systematically planned, documented and reviewed in line with Australian standards, environmental approvals and WHS legislation. The result is safer access tracks, work platforms, stockpile areas, drainage features and embankments that support efficient operations while reducing the likelihood of incidents, rework and regulatory scrutiny.

Key Benefits

• Reduce the risk of ground collapse, slope failure and vehicle rollover through a structured approach to terrain design and verification.
• Ensure terrain modification activities are planned and executed in line with WHS legislation, Australian Standards and environmental constraints.
• Standardise how supervisors and operators assess ground conditions, set safe work limits and document control measures across multiple sites.
• Improve coordination between engineers, surveyors, plant operators and WHS personnel, reducing delays, rework and conflicting instructions.
• Demonstrate due diligence to regulators and clients by maintaining clear records of terrain risk assessments, approvals and inspections.

Who is this for?

• Civil Construction Managers
• Site Supervisors
• Project Engineers
• WHS Managers
• Earthmoving Contractors
• Quarry Managers
• Local Government Works Supervisors
• Mining Supervisors
• Land Development Project Managers
• Rail and Road Maintenance Coordinators

Hazards Addressed

• Ground instability, slips and slope failures on cut and fill batters
• Vehicle and mobile plant rollovers on uneven or inadequately compacted terrain
• Loss of control of earthmoving plant on steep grades or unstable surfaces
• Tripping, falling and sprain injuries due to rutted, eroded or poorly graded walking and working surfaces
• Undermining of existing structures, services or retaining systems during excavation or regrading
• Uncontrolled surface water runoff leading to erosion, scouring and washouts
• Striking underground or aboveground services during excavation or contouring
• Dust generation from exposed or newly modified terrain impacting visibility and respiratory health
• Falling objects and rockfall from unbenched or unstable faces
• Public interface risks where terrain modification occurs near roads, footpaths or adjoining properties

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Key Concepts (cut, fill, batter, benching, safe operating gradient)
• 3.0 Roles and Responsibilities (PCBU, Project Manager, Engineer, Supervisor, Plant Operator, WHS Advisor)
• 4.0 Applicable Legislation, Standards and Codes of Practice
• 5.0 Pre-Works Planning and Approvals (design inputs, geotechnical advice, permits, environmental conditions)
• 6.0 Site Assessment and Terrain Risk Identification (ground conditions, drainage, services, public interfaces)
• 7.0 Controls for Terrain Modification (design of slopes, benches, access tracks and work platforms)
• 8.0 Plant and Equipment Requirements (selection, capacity limits, stability considerations, pre-start checks)
• 9.0 Traffic Management and Segregation of People and Plant
• 10.0 Step-by-Step Terrain Modification Procedure (set-out, excavation, filling, compaction, trimming and verification)
• 11.0 Working Near Services, Structures and Boundaries
• 12.0 Erosion, Sediment and Drainage Controls
• 13.0 Inspection, Testing and Acceptance Criteria (compaction testing, slope checks, survey validation)
• 14.0 Hazard Controls and Hierarchy of Control Application
• 15.0 Personal Protective Equipment (PPE) Requirements
• 16.0 Environmental and Weather Considerations (wet weather, flooding, high winds, heat)
• 17.0 Emergency Response and Incident Management (slope failure, rollover, service strike)
• 18.0 Training, Competency and Verification of Plant Operators and Supervisors
• 19.0 Documentation, Records and As-Built Information
• 20.0 Monitoring, Review and Continuous Improvement of Terrain Safety Controls

Legislation & References

• Model Work Health and Safety Act 2011 (Cth)
• Model Work Health and Safety Regulations 2011 (Cth)
• Safe Work Australia – Code of Practice: Managing the Risk of Falls at Workplaces
• Safe Work Australia – Code of Practice: Excavation Work
• Safe Work Australia – Code of Practice: Managing Risks of Plant in the Workplace
• AS 3798: Guidelines on earthworks for commercial and residential developments
• AS 2159: Piling – Design and installation (where terrain modification affects foundations and support)
• AS/NZS 1170.0: Structural design actions – General principles (for loads on slopes and structures)
• AS/NZS ISO 31000: Risk management – Guidelines
• State and Territory-specific WHS Regulations and local council requirements relating to earthworks, erosion and sediment control