Which type of soil is typically removed before construction?

Which type of soil is typically removed before construction?

• A. Organic soil
• B. Bedrock
• C. Sand
• D. Clay

Answer: (A)

When preparing a site for construction, you need soil that can reliably carry loads without excessive or unpredictable settlement. Organic soils—like peat and muck—are weak, highly compressible, and can lose strength as they decompose or take on water. They often swell, shrink, or settle unevenly, making foundations unstable. Because of these persistent problems, they’re typically removed and replaced with stable engineered fill to achieve the required bearing capacity and controlled settlement. Other materials such as bedrock, sand, or clay may be managed through excavation, stabilization, or compaction, but they don’t present the same level of long‑term instability as organic soils.

When preparing a site for construction, you need soil that can reliably carry loads without excessive or unpredictable settlement. Organic soils—like peat and muck—are weak, highly compressible, and can lose strength as they decompose or take on water. They often swell, shrink, or settle unevenly, making foundations unstable. Because of these persistent problems, they’re typically removed and replaced with stable engineered fill to achieve the required bearing capacity and controlled settlement. Other materials such as bedrock, sand, or clay may be managed through excavation, stabilization, or compaction, but they don’t present the same level of long‑term instability as organic soils.