When AS 3798 may apply to an earthworks project
AS 3798 provides guidance relating to earthworks for commercial and residential developments. Its relevance depends on the actual project, specified design requirements, proposed fill placement and any contractual or approval conditions.
Not every small excavation or residential earthworks activity requires the same level of assessment. The appropriate scope should be determined from the development, the intended use of the ground and the requirements of the project design team.
Fill placement, material suitability and construction records
Ground performance can depend on the nature of the fill, placement procedures, moisture condition, compaction approach, underlying material and site drainage. The relevant observations and records depend on the agreed engineering scope.
Where a project requires inspection, field testing or verification documentation, those requirements should be established before earthworks begin. The specific level of geotechnical involvement and responsibility must be clearly agreed; no universal certificate is implied.
Scope the assessment to the actual ground use
A building platform, working platform, pavement subgrade and retaining-wall backfill can involve different performance requirements. Provide current civil or architectural plans, the intended use of the ground and any specification or designer request.
A project-specific quotation should identify what field observations, testing, engineering input or reporting are included rather than assuming that every earthworks package has the same scope.
Common questions
Earthworks, compaction and AS 3798: common questions
Does AS 3798 apply to every residential excavation?+
Not automatically. Its relevance depends on the type of earthworks, project specifications, proposed fill, design requirements and any applicable approval or contractual conditions.
Is compaction assessment the same as a site-classification report?+
No. Earthworks or compaction assessment and AS 2870 residential site classification address different project questions and require separate project-specific scopes.
Should earthworks verification be arranged before filling starts?+
Where inspection, testing or construction records are required, those obligations should be clarified early with the relevant designer and geotechnical consultant.
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This guide provides general information only and is not a substitute for investigation, engineering advice, footing design or approval advice for a particular property. Project requirements and ground conditions must be assessed site by site.
