Field Quality
Assurance Testing

On-site testing to confirm your earthworks and construction meet specification

Successful construction depends on more than placing the right materials. Those materials must also be prepared, placed and compacted correctly.

As an IANZ-accredited testing provider, Civil Services delivers reliable field quality assurance testing backed by recognised standards and proven testing procedures.

Our field quality assurance testing services provide on-site verification that earthworks, building platforms, roads and other civil works are meeting the required engineering specifications.

We work with contractors, developers, engineers and project managers throughout construction, providing accurate testing and clear results at the stages when they are needed.

Field testing can help confirm that the work is suitable to proceed, identify areas requiring further attention and provide the records needed for engineering or council approval.

Our field quality assurance services include:

Earthworks compaction testing

Retaining wall backfill testing

Roading compaction testing

Nuclear density testing

Building platform and house pad testing

Shear strength testing

Scala penetrometer testing

Material sampling

Site observations and quality records

Testing for engineering and council sign-off

Our Field Quality assurance Services

Explore our specialist services, from planning and design through to construction support and quality assurance.
01 Earthworks Compaction Testing

Earthworks compaction testing confirms whether placed fill has been compacted to the required density.

This is an important part of subdivisions, building platforms, retaining walls, stopbanks, commercial developments and civil infrastructure projects.

Poorly compacted fill can settle, move or lose strength over time. This can create problems for anything constructed above or alongside it.

Our team tests the material in place and compares the results with the relevant laboratory data and project specification.

Earthworks compaction testing may be required for:

Testing at the correct stages helps identify any issues while they can still be addressed, rather than after further construction has covered the work.
Roads rely on properly constructed and compacted layers to provide long-term strength and stability.

We provide field compaction testing for road formation, pavement layers and granular materials used in public and private roading projects.

This can include testing for:

Each layer must meet the required specification before the next is placed. Regular testing helps contractors maintain quality and provides confidence that the completed pavement has been constructed correctly.
Before foundations are constructed, the building platform must be capable of supporting the proposed structure.

Field testing can confirm whether natural ground or engineered fill beneath a house pad or commercial building platform meets the requirements set by the project engineer.

Testing may be required during:

The testing requirements will depend on the design, soil conditions and type of construction proposed.
Retaining walls rely on suitable materials being placed and compacted correctly behind the structure.

Testing engineered backfill during construction helps confirm that the required compaction is being achieved and reduces the risk of future settlement or movement.

This may form part of:

Testing is especially important where the wall supports a building, road, driveway or other significant load.
Nuclear density testing provides an efficient method of measuring the density and moisture content of compacted soil and aggregate in the field.

The results are compared against the material’s laboratory-determined maximum dry density to establish how effectively it has been compacted.

Nuclear density testing is commonly used for:

This allows contractors and engineers to quickly identify whether an area meets specification or needs further compaction.
Shear strength testing helps assess the strength and consistency of cohesive soils in the field.

It may be used to evaluate exposed natural ground, prepared subgrades or placed materials during earthworks and construction.

This testing can help engineers determine whether the ground is suitable for the proposed work or whether further excavation, replacement or treatment may be required.

Scala penetrometer testing measures the resistance of the ground as a probe is driven into the soil.

It provides an indication of ground strength and can help identify changes between soil layers or areas of weaker material.

Scala testing is commonly used for:

The results provide useful field information for engineers assessing the suitability of the ground.
Field sampling connects on-site quality assurance with laboratory testing.

Samples may be collected before construction begins to determine whether a proposed material is suitable, or during construction to verify the properties of the material being used.

Sampling can include:

Testing materials before they are placed can prevent avoidable delays. It allows contractors and project teams to understand the material requirements before construction reaches a critical stage.
Quality assurance testing needs to be planned around the construction programme.

Testing too late can mean waiting for laboratory results, reopening completed work or delaying the next stage of construction.

Where possible, we recommend identifying proposed materials early and completing the necessary laboratory testing before bulk earthworks or construction begins.

This creates a smoother process by ensuring the relevant reference data is ready when field compaction testing starts.

Our role is not simply to perform tests. We provide clear records that engineers, contractors, councils and clients can use to confirm the work has met the required standard.

Depending on the project, this may include:

Whether you are preparing a house pad, constructing a subdivision road or completing major earthworks, timely field testing helps you build with confidence.

Contact our team early so we can understand the project specifications, coordinate the required laboratory testing and provide field quality assurance throughout construction.

Let’s Discuss Your Project

Every successful project starts with the right advice.

Whether you’re still exploring options or ready to begin construction, we’d be happy to discuss your requirements and recommend the most practical path forward.

Contact Civil Services (HB) Ltd today to speak with one of our experienced engineers or project specialists.

Our Address

9/11 Wakefield Street, Onekawa, Napier, 4110

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