66" / 72" North Relief Trunk Sewer Rehab

1. Project Location: San Jose, California.

2. Diameter of line, sewer pipe material (RCP, MCIP, brick, etc.), length of rehab portion: RCP 66" (2,560') and 72" (2110') of rehab.

3. When was it constructed and how long has it been in service: Unknown

4. Rehab method used: Danby Panel Lok III (spirally wound) with full annulus grouting with cementitious grout with minimum compressive strength of 6000 psi.

5. Cleaning method used (if required) and who cleaned the line: High pressure (3,000 - 10,000 psi) water blasting performed by the Danby licensee (Rondeau Bay Construction).

6. Method of flow bypass or diversion, if used: Flows 100% diverted during work day, but reinstated during non-work periods. Laterals remained active at all times.

7. Depth of pipe: 15 feet.

8. Depth of ground water: 10 feet.

9. Ventilation and odor control used: Fresh air pumped into pipe past upstream air dam; maintained sealed lids during non-work periods, and adequate ventilation to carry odors downstream during the work periods.

10. Construction cost (total amount and cost per foot): $2,599,020 / $556.54/ft.

11. Month and year of start-up and end of construction: May 1996 - September 1996.

12. Problems encountered during construction: Some problems with establishing diversion. In addition to the known horizontal curves, there were several unexpected vertical curves (undulations creating ponds/sumps) which slowed liner installation and required transition sections in liner. Also, there was an 18” pipe crossing the interior of the pipe at the crown.

13. Problems encountered after construction: None.

14. Health and safety: Used conventional confined space entry program.

15. Has any re-inspection been performed? What was the condition of the pipe? No.


Mr. Ken Salvail

City of San Jose

Telephone: 408-277-4638

San Jose 66" North Trunk Relief