Shepparton grew rapidly during the post-war irrigation boom, when the Goulburn Valley became a major fruit-growing region. That expansion meant many industrial sheds, packing plants and residential subdivisions were built without detailed geotechnical records. Today, when we dig an exploratory test pit in Shepparton, we often find variable layering – sandy loam over stiff clay, sometimes with old drainage lines or buried organic pockets. The city sits on the Shepparton Formation, a sequence of fluvial sediments that can change within metres. That is why visual logging and in-situ density tests from test pits remain essential for low-rise loads. For deeper profiling we combine the pit with an ensayo SPT to correlate blow counts with the stratigraphy we see.
In Shepparton's fluvial soils, a test pit reveals the variability that boreholes miss – desiccation cracks, old root channels, and perched water tables.
Method and coverage
- Stratigraphy and layer thickness (mm)
- Soil colour, plasticity, and consistency
- Standing water level and seepage rate
- In-situ dry density by sand replacement
Regional considerations
We worked on a cold-store expansion near the Goulburn River where a previous consultant had only drilled boreholes. The soil log showed uniform clay, but during excavation a hidden sand seam emerged. Water poured in. The footing design had to be re-calculated. That is the real risk with blind drilling in Shepparton – you miss the lenses. An exploratory test pit gives the contractor a visual check before concrete is poured. It is cheap insurance, especially when the site is near the floodplain or old channels. We always recommend at least one test pit per 500 m² of footprint for industrial slabs.
Standards that apply
AS 1726 – Geotechnical site investigations, AS 4678 – Earth-retaining structures, AS 3798 – Guidelines on earthworks for commercial and residential developments
Complementary services
Foundation Test Pit
Shallow pits down to 2.5 m for residential footings and slab-on-ground. We log the soil, collect bulk samples, and issue a foundation classification per AS 2870. Includes in-situ density by sand replacement.
Service Trench Inspection
Pits along proposed water, sewer or stormwater alignments. We identify any rock, groundwater, or aggressive soils that affect trench shoring and bedding. Typical depth 2.0 m, shored as required.
Slab Subgrade Assessment
For industrial cold stores, packing sheds, and farm machinery sheds. We excavate at slab corners, perform plate load tests within the pit, and verify that the subgrade meets the design CBR. Backfill compacted to 95% standard Proctor.
Typical parameters
Top questions
How deep can you dig a test pit in Shepparton?
Typically 2.5 to 3.5 m, limited by groundwater and excavation stability. In the drier western parts of Shepparton we have reached 4.5 m. Below that, we switch to boreholes or cone penetrometer testing. AS 4678 requires benching or trench boxes below 1.5 m.
How much does an exploratory test pit cost in Shepparton?
Between AU$880 and AU$1.270 per pit, including logging, bulk sampling, and backfill. The price varies with depth, number of pits, and whether you need undisturbed block samples. Multi-pit discounts apply for sites over 2,000 m².
When should I choose a test pit instead of a borehole?
Choose a test pit when you need to see the soil profile visually – for shallow foundations, service trenches, or detecting buried obstructions. Boreholes are better for deep strata or when you need SPT N-values. In Shepparton's variable soils we often combine one test pit with two boreholes per site to get the full picture.