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Sitework & Earthworkaka: borrow areaaka: borrow source

Borrow Pit

In Plain English

An area where fill dirt is dug out from and hauled to another location on or near the project site.

Definition

An area, typically off-site or in a low area of the project, where suitable fill material is excavated and transported to locations requiring fill. Borrow material must be tested and approved by the geotechnical engineer for the intended use. When a project requires more fill than the excavation generates, borrow material must be imported from approved sources.

Why It Matters in Bidding

When a site's cut-and-fill balance runs short, the estimator must price imported borrow material plus excavation, hauling, and placement, which can be a major and volatile earthwork cost driven by haul distance. Identifying borrow needs early during takeoff prevents a bid from being underwater when the project turns out to be fill-deficient and material has to be trucked in.

Example

After running the earthwork cut-fill analysis on a roadway job, the estimator finds a 15,000-cubic-yard fill shortfall and prices borrow material from an approved pit eight miles out, including the haul cycles that dominate the line-item cost.

Related Terms

Fill MaterialImport MaterialCut and FillEarthwork

Frequently Asked Questions

When excavation generates less fill than the project needs, the shortfall must be imported as borrow, adding material, excavation, hauling, and compaction costs. Haul distance and truck-cycle time often dominate that cost. Estimators identify the shortfall through a cut-and-fill analysis, then price borrow per cubic yard delivered and placed, with a factor for compaction shrinkage.
Yes. Borrow must meet the project's geotechnical and specification requirements for its intended use, such as structural fill or embankment. The geotechnical engineer typically approves the source and material gradation. Estimators should confirm whether testing, approval, and any moisture conditioning fall in their scope, since rejected borrow means rehauling and added cost.
A borrow pit is where fill material is excavated and hauled to areas needing fill, while a spoil site receives excess or unsuitable material hauled away from the project. One supplies dirt; the other disposes of it. A job can require both when excavated material is unsuitable yet additional approved fill must still be imported.

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