66” x 66” Semi-Elliptical Sewer

Project Location
County Sanitation District No. 2.
Construction cost
Unknown - Est. $690/ft
Construction Start/End
08/01/1999 - 10/20/1999


When was it constructed and how long has it been in service:
Unknown age. Many clay tiles had fallen off and the exposed concrete was severely corroded

Diameter of line, sewer pipe material (RCP, MCIP, brick, etc.), length of rehab portion: 66" x 66" Semi-Elliptical Sewer made of unreinforced concrete

Depth of pipe:
3 to 5 feet to crown.
Depth of ground water:
No ground water.
Health and safety:
Used conventional confined space entry program.
Has any re-inspection been performed? What was the condition of the pipe?

Jane Fongrow
County Sanitation Districts of Los Angeles County
Telephone: 562-699-7411, ext. 1631


Ventilation and odor control used:
Fresh air pumped into pipe at upstream manhole, and suction fan at downstream manhole to provide adequate ventilation during the work periodsrow.
Rehab method used:
Danby Panel Lok with full annulus grouting with cementitious grout with minimum compressive strength of 5000 psi. Panel Lok flat panels arched from “J” strip anchors at invert corners. No lining of invert. Section under railroad track had 4” of grout and steel rebar designed by District’s structural engineers.
Cleaning method used (if required) and who cleaned the line:
High pressure (10,000 psi) water blasting performed by the Danby licensee (Sancon Technlogies, Inc.).
Method of flow bypass or diversion, if used:
None. Pipe was out of service.


Problems encountered during construction:
None. Transitions into and out of the thicker grout wall section, as well as from semi-elliptical pipe into circular 60” pipe slowed normal productivity. Danby and licensee sought and received permission to change grout mix design to lower heat of hydration in thicker section.
Problems encountered after construction: