Installation of a New Guardrail along the Roadway in San Rafael.

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  • Installation of a New Guardrail along the Roadway in San Rafael.

Full Case Study as Reported:

A 30 inch sewer main that conveys wastewater from Tamalpais Valley to the south Sausalito-Marin city sanitary district treatment plant was punctured while the road contractors were installing a new guardrail along the roadway.


As a result, thousands of gallons of raw sewage were spilled into an adjacent wetland. 


Following the incident, traffic was stopped for several miles. 


Earlier that week, contractors working on the same stretch of highway punctured the same sewer pipe twice with a boring unit as they were drilling holes for new posts. 


During the pipe repair and cleanup, a traffic lane was closed. Officials estimated direct costs to be around $10,000.

Outcomes Reported:

Cause: Puncture due to drilling operation


Damage: 5,000 -10,000 USD, spill of raw sewage


Injuries: None

Related Keywords:

Sewer pipelines, Spills (environmental pollution), Traffic/flight delays, Drill


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  • Installation of a New Guardrail along the Roadway in San Rafael.