§  Construction of reinforced concrete shafts.

§  Sinking shafts as caissons under free and compressed air pressure.

§  Diversion of public utilities (Electricity, Gas, Water, Telephone, Sewage...).

§  Driving tunnel (2.87 m - 2.20 m I.D.) with Earth Balance Machines (Tunnel Boring Machines).

§  Erection of the primary tunnel lining (Reinforced concrete segments).

§  Erection of secondary lining using acid resistant blue bricks

§  Repairing leakage points at tunnel and shafts using special sealing materials

§  Application of chemical resistant epoxy mortar C.R.M. to the blue bricks' joints

§  Grouting mortar between primary lining and soil and also between primary and secondary linings

§  Connections between the existing sewage systems to the shafts using manholes, grit traps, culverts, pipe lines, etc...

Diversion of public utilities (Electricity, Gas, Water, Telephone, Sewage...)