CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is installing a new underground sanitary drain line for a commercial building. The pipe is 6 inches in diameter and made of PVC. According to the California Plumbing Code (CPC), what is the minimum cover required for this underground sanitary drain pipe in a trench located under a driveway?
- A12 inches
- B36 inches
- C24 inches
- D18 inches
Show answer & explanationAnswer & explanation
Correct answer: D. 18 inches
The California Plumbing Code specifies minimum cover requirements for underground piping to protect it from damage. For sanitary drain pipes under driveways, a minimum of 18 inches of cover is required.
Why the other options are wrong
- A. 12 inches is typically for pipes not under driveways or in areas with vehicular traffic.
- B. 36 inches is excessive and typically not a minimum requirement for this type of installation unless other factors are involved.
- C. 24 inches is often required for larger diameter pipes or in specific utility easements, but not the minimum for this scenario.
Underground Sanitary Drain Cover (Driveway)
The minimum depth of soil or fill material required over an underground sanitary drain pipe when it is located beneath a driveway or vehicular traffic area.
- Protects pipe from crushing and impact.
- Varies based on pipe material, size, and location.
- Specific requirements are detailed in the California Plumbing Code (CPC).
Memory trick: Driveway Drains Demand Deep Dirt.