Deep Rock Tunnel Connector Construction

About this project

The deep rock tunnel connector construction captured, stored, and transported CSO to avoid overflows into the local waterways.

The project scope included approximately 39,400 lineal feet of 20 ft. excavated diameter deep rock tunnel, about 3,200 lineal feet of connection tunnels, three tangential vortex drop shafts, three utility shafts, one large DRTC pump station with a firm capacity of 120 MGD, and maximum capacity of 150 MGD. The 70'x150'x70' pump room was 260 feet below the surface, with a 150'x85' two-story pump station on the surface.

Sigma was the Resident Engineer and surface and in-tunnel investigator for the overall storage tunnel system, and provided construction management / administration service. Sigma design services included the electrical, instrumentation, and controls systems for the surface CSO regulators and the 200 foot deep pump station. The station’s electrical design included an electrical feeder connection to the new pump station from the advanced water treatment facility.

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