The City of San Mateo experienced sanitary sewer overflows in their collection system during heavy rains. The City not only had to convey its own sewage flows, but also those of the Town of Hillsborough and Crystal Springs County Sanitation District. After years of negotiations and under the mandate of a cease-and-desist order from the Regional Water Quality Control Board, the City, Town and District agreed to construct a dedicated sewage relief line.A new, large-diameter underground pipeline that needed to be thread down busy, congested commercial and residential streets, an environmentally sensitive creek and Caltrain corridors: What could go wrong?This paper will discuss the importance of project contingency planning and will provide an overview of the pilot tube guided boring technique under an environmentally sensitive creek. Of particular importance:
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