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Balboa Terrace Trunk Sewer
Contracted By City of San Diego
Public Project
Dates Work Performed August 2012 - August 2013
Location San Diego, California
Scope of Work
- 3000 LF of 15" to 23" pipe installed in open cut sewer
- 6000 LF of 48" to 72" tunnel with 20" Hobas Pipe
- 52' deep secant shoring pit required for tunneling and structure
- Resurfacing, flatwork, offsite revegetation
Unique Aspects
- 48" auger bore through significant amount of concreted Ardatch shale
- 72" TBM boring through significant amount of concreted Ardatch shale
- 52' secant shoring pit adjacent to 69KV powerlines
- 23' deep slide rail shoring due to adjacent condominium project
- Abandonment of existing sewer in easement and up to 60' deep
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