Trenchless Relief

by Tad Pilecki, Project Manager; Central Contra Costa Sanitary District, Martinez, CA,
Stephen J. Klein, Associate; Woodward-Clyde Consultants, Oakland, CA,
Art Hamid, Vice-President; Montgomery-Watson, Walnut Creek, CA,

Serial Information: Civil Engineering—ASCE, 1994, Vol. 64, Issue 1, Pg. 58-60

Document Type: Feature article


During wet weather, stormwater infiltration/inflow into the sewer system increases wastewater flows by 8-12 times the average dry weather flow in several interceptors operated by the Central Contra Costa Sanitary District. To eliminate resulting overflows into streets and residences along an existing interceptor route in Pleasant Hill, Calif., the District is constructing a new 25,700 ft relief interceptor. Pipe sizes range from 30-66 in. dia. Pipeline depth varies from 10-25 ft, with the majority 15-20 ft below the ground surface. The article describes a detailed feasibility study that found microtunneling/pipe jacking methods were practical for constructing several portions of the pipeline.

Subject Headings: Pipe sizes | Feasibility studies | Wastewater management | Trenchless technology | Streets | Stormwater management | Sewers

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