42" & 48" RCP Alma Street Rehab

1. Project Location: San Jose, California.

2. Diameter of line, sewer pipe material (RCP, MCIP, brick, etc.), length of rehab portion: 42" & 48", RCP, 3600 feet of rehab.

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

4. Rehab method used: Danby Spiral Lok (same cross section as PL III but only 8" wide and different edge locking design) with full annulus grouting with cementitious grout with minimum compressive strength of 5000 psi (800 psi required).

5. Cleaning method used (if required) and who cleaned the line: High pressure (3,000 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.

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): $875,000 / $243/ft.

11. Month and year of start-up and end of construction: December 1990 - March 1991.

12. Problems encountered during construction: No significant problems.

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? Yes (April 1993). The pipe was found to be in good condition.


Mr. Ken Salvail

City of San Jose

Telephone: 408-277-4638

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