Which zone sits directly above the Bedding Zone and includes space up to 12 inches above the pipe?

Which zone sits directly above the Bedding Zone and includes space up to 12 inches above the pipe?

• A. Bedding Zone
• B. Cover Zone
• C. Soil Envelope
• D. Lowest Zone

Answer: (B)

The key idea is how pipe burial is divided into layers: the Bedding Zone is the bottom support the pipe sits on, while the space directly above that up to the surface is the Cover Zone. The Cover Zone describes the soil over the pipe, typically extending up to about 12 inches above the pipe. This layer provides protection from loads, weather, and damage, forming the immediate cover above the bedding. The other terms refer to different parts or broader surroundings: Bedding Zone is below the pipe, Soil Envelope is the wider surrounding soil, and Lowest Zone isn’t a standard term for this context.

The key idea is how pipe burial is divided into layers: the Bedding Zone is the bottom support the pipe sits on, while the space directly above that up to the surface is the Cover Zone. The Cover Zone describes the soil over the pipe, typically extending up to about 12 inches above the pipe. This layer provides protection from loads, weather, and damage, forming the immediate cover above the bedding. The other terms refer to different parts or broader surroundings: Bedding Zone is below the pipe, Soil Envelope is the wider surrounding soil, and Lowest Zone isn’t a standard term for this context.