back sewer Interview Questions and Answers

1. What is a back sewer?

   • Answer: A back sewer is the portion of a sewer line that runs from the building's connection to the main sewer line in the street. It's typically privately owned and maintained by the property owner.

2. What are the common materials used for back sewers?

   • Answer: Common materials include cast iron, clay tile, PVC, and HDPE (high-density polyethylene).

3. What are the signs of a back sewer problem?

   • Answer: Signs include sewage backing up into toilets, sinks, or showers; slow draining; foul odors; gurgling sounds from drains; and soggy or wet ground around the foundation.

4. What causes back sewer problems?

   • Answer: Causes include blockages (tree roots, debris, grease), pipe collapse or cracks, improper slope, and high water table.

5. How is a back sewer inspected?

   • Answer: Inspection methods include using a sewer camera (CCTV inspection) to visually assess the pipe's condition from inside, and sometimes using a smoke test to locate leaks.

6. What are the common methods for back sewer repair?

   • Answer: Repair methods include pipe lining (cured-in-place pipe, or CIPP), point repair (for small cracks or holes), pipe bursting, and full pipe replacement.

7. What is cured-in-place pipe (CIPP)?

   • Answer: CIPP is a trenchless method of repairing pipes. A resin-soaked liner is inserted into the existing pipe, inflated, and cured to create a new pipe within the old one.

8. What is pipe bursting?

   • Answer: Pipe bursting is a trenchless method where a new pipe is pulled through the existing pipe, breaking it apart as it goes.

9. What are the advantages of trenchless repair methods?

   • Answer: Advantages include less excavation, faster repair times, less disruption to landscaping, and lower costs compared to full pipe replacement.

10. What are the disadvantages of trenchless repair methods?

    • Answer: Disadvantages can include potential for liner misalignment, limitations on pipe size and condition, and potentially higher upfront costs for certain techniques.

11. What is the role of a cleanout in a back sewer system?

    • Answer: A cleanout provides access for cleaning and inspection of the sewer line.

12. How often should a back sewer be inspected?

    • Answer: Regular inspections are recommended, but the frequency depends on factors such as age of the pipe, material, and history of problems. A professional can advise on a suitable schedule.

13. What are the permit requirements for back sewer repairs?

    • Answer: Permit requirements vary by location. It's crucial to check with your local municipality before starting any work.

14. How can I prevent back sewer problems?

    • Answer: Preventative measures include regular inspections, avoiding pouring grease down drains, using drain strainers, and scheduling regular drain cleaning.

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