66" / 72" North Relief Trunk Sewer Rehab

Project Location
San Jose, California
Construction cost
$2,599,020 / $556.54/ft.
Construction Start/End
05/1996 - 09/1996


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

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

Depth of pipe:
15 feet.
Depth of ground water:
10 feet.
Health and safety:
Used conventional confined space entry program.
Has any re-inspection been performed? What was the condition of the pipe?

Mr. Ken Salvail
City of San Jose
Telephone: 408-277-4638


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


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.
Problems encountered after construction: