Map of Proposed Sewer Repairs

This information is preliminary and is subject to change.

From the July 1, 2019 Staff Report:

Harris and Associates have completed the survey, inspection, and assessments of the existing sanitary sewer mains and have identified several major deficiencies including cracks, broken and collapsed pipes, sags, and offset joints. To address these deficiencies, Harris, and Associates proposes three different methods for the rehabilitation of the pipelines taking into account the condition of the existing pipeline, type of repair needed, and impact on the downtown business area as shown on the location map.

Click here to enlarge map.

What Type of Work Is Proposed?

Trenchless Cured-in-Place Pipe method (CIPP) consists of inserting a polyester liner into the existing sewer main. Prior to performing CIPP, any defects in the pipe that requires correcting will be repaired by excavating down to the pipe and performing a spot repair. Watch a video about CIPP.

CIPP will take place along:

  • Gardner Street from West Blithedale Avenue to Corte Madera Avenue.
  • Corte Madera Avenue from Gardner Street to Lower Alcatraz Place.
  • Throckmorton Avenue from Bernard Street to Madrone Avenue.

Trenchless Pipe Bursting consists of inserting a cone-shaped tool into the existing pipe, fracturing the existing pipe and pulling a new pipe through the existing pipe. Existing lateral connections will be reinstated after the new pipe is installed in place by an open trench. Watch a video about pipe bursting.

Pipe bursting shall take place along:

  • East Blithedale Avenue from Sunnyside Avenue to Throckmorton Avenue.
  • Sunnyside Avenue from East Blithedale Avenue to Miller Avenue.
  • Throckmorton Avenue from East Blithedale Avenue to Corte Madera Avenue.
  • Throckmorton Avenue from Corte Madera Avenue to Bernard Street.

Open Trench Pipeline Replacement consists of replacing the existing sewer main through excavation and backfill. This method is the most disruptive and only used where other methods are infeasible. The open trench will take place along:

  • West Blithedale Avenue from Oakdale A venue to Gardner Street.
  • Corte Madera Avenue from Throckmorton A venue to Bayview Street.

General Information: 

At this time, we estimate that the City will conduct Sanitary Sewer Repair no sooner than May 1, 2020. Construction will be phased, so that the impacts are concentrated in one area at a time. Construction will generally take place Monday-Friday, from 8 am to 5 pm. 

There may be some night work, depending on the construction phasing and community needs. There will not be work on weekends.

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