You have a lot to clear before pouring the foundations, or you need to lower the grade of a yard that must stay at a set elevation. In both cases the soil has to be removed across the entire surface, not just at isolated points, and it has to be taken off the jobsite or stockpiled where it won't interfere with the next phases. That is bulk excavation: not a localized dig, but the removal of a continuous layer of soil across a defined area.
What bulk excavation is used for
Bulk excavation is needed any time the working grade must be brought below the existing one. The two most common situations are: preparing the bearing surface for building foundations, where you dig down to the depth specified by the structural design, and grading yards, private driveways, or parking areas, where unstable or topsoil is removed to lay a compact base.
In both cases, before starting, the design must establish the final grade, the slope of the cuts, and where the spoil goes. Without these three fixed points, the excavation can create problems that cost more than the excavation itself.
Slopes: why they matter
When digging deep, the side walls cannot be vertical unless a retaining structure is built. On standard soils, a sloped cut is left — an angled face that reduces earth pressure and prevents collapse.
The gradient depends on the nature of the soil: a stiff clay holds a steeper gradient than loose sand. Getting this assessment wrong means ending up with a cave-in that fills the excavation, slows the jobsite down, and can put workers at risk. A geotechnical engineer or structural engineer checks this beforehand, not after.
Where the spoil goes
The soil removed during bulk excavation has to go somewhere. There are two options, and each has a clear limit beyond which it stops working.
The first is reuse on the jobsite: the spoil is stockpiled in an area of the lot and reused for backfill, grading, or landscaping in later phases. This works when the lot is large enough to have a storage zone that does not block ongoing work and when the soil quality is suitable for reuse. It does not work if the soil is contaminated, mixed with debris, or if there is simply no physical space to keep it without blocking equipment access.
The second option is hauling to a skip or a licensed disposal site. It requires more trips and a machine to move the soil from the dig face to the truck loading point, since trucks often cannot get close enough. This is where internal jobsite transport becomes the bottleneck of the entire operation.
On tight lots, transport makes the difference
On an open jobsite with wide access, moving spoil is straightforward: the excavator loads directly into the truck. But on an urban lot with a narrow side entrance or a pedestrian gate, the truck cannot get in and internal transport has to be organized separately.
A compact tracked dumper gets through where nothing else can, loads at the dig face, and carries the soil to the point accessible to the truck. The tracks distribute the weight across the floor of the excavation without sinking, even when the ground is wet or soft. The tipping skip unloads without the operator having to handle anything by hand. On a tight jobsite, it significantly reduces the number of workers tied up solely in transport.
To understand the differences between bulk excavation and slab excavation — two operations that are often confused — it is worth reading Slab excavation and bulk excavation: the differences.
In the Cormidi lineup
The Cormidi tracked dumpers cover this jobsite phase in the C6X, C7X, C8X, C85, and C200 configurations, with tipping skips, 180-degree swivel skips, or high-lift discharge. Where the jobsite is in an urban area or noise is a constraint, the C85E is the battery-electric version. Remote control is available on all models for the most awkward stretches.
Before deciding, what to measure
Check the width of the access point to the lot: it is the first figure that rules equipment in or out. Check the excavation depth specified by the design and the nature of the soil, which determine whether wide slopes or retaining structures are needed. Estimate the volume of soil to be moved to work out how many trips are required and whether it is better to stockpile on-site or haul it away immediately. Then talk to a local Cormidi dealer: with these figures in hand, choosing the right machine is straightforward.
