Strategic Tunnel Enhancement Programme

STEP (Strategic Tunnel Enhancement Programme)

Abu Dhabi, United Arab Emirates

Location: Abu Dhabi

Client: Abu Dhabi Sewerage Services Company

Contractors: Samsung Engineering, Impregilio, Zublin, Oderbrecth

Consultant: CH2M Hill

Sections: Main Sewer (41 km); Link Sewer (40 km); Pumping Station (100 m underground)

Duration: 2012 – 2016

STEP (Strategic Tunnel Enhancement Programme) constitutes one of the largest tunnel sewerage systems in the world. This huge gravity-driven hydraulic wastewater network tunnel was divided into 3 sections: Main Sewer, Link Sewer, and the Pumping Station. Encardio-rite Geosystems LLC, UAE was chosen to provide instrumentation and monitoring services in all the sections.

The scope of work included:

Main Sewer (T01, T02, T03 – 41 km):
Pre and post construction building condition survey, Supply, Installation and Monitoring of Geotechnical Sensors and Surveying.

Link Sewer (LS01, LS02 – 40 km):
Pre and Post Construction Building Condition Survey, Supply, Installation and Monitoring of Geotechnical Sensors and Surveying.

Pumping station 100 m deep, 55 m wide, one of the deepest shaft for a Sewage Treatment plant:
Pre and post construction building condition survey, Supply, Installation and Monitoring of Geotechnical sensors and Surveying.
The data was monitored online by the web-based data monitoring system. The monitoring of the pumping station required very deep installations, up to 115 m deep, for subsurface instruments like an inclinometer, piezometer etc., which was executed successfully by the Encardio-rite Group.