The tender contract concerns the maintenance of the barriers of the Lido Treporti barrier, divided as follows:

First phase

- remaking of the TP-12 reserve gate, currently stored in the Arsenale, of the antifouling coating, construction of 2 watertight chambers and installation of the instrumentation, the males and the shock absorbers,

- removal of the TP-01 gate currently in Pos. 6,

- installation of the TP-12 reserve gate in Pos. 6,

- maintenance of the TP-01 sluice gate removed from the barrier, implementation of changes to the internal instrumentation including the sealed chambers,

- removal of the TP-21 gate currently in Pos. 2,

- installation of the TP-01 sluice gate in Pos. 2,

- maintenance of the TP-21 sluice gate removed from the barrier, implementation of changes to the internal instrumentation including the sealed chambers and its transport to the Arsenal after maintenance has been completed,

- evaluation of the results achieved during the first phase and planning of subsequent activities,

Second phase

- rebuilding of the TP-13 reserve gate, currently stored in the Pagnan area, of the antifouling coating, construction of two watertight chambers and installation of the instrumentation, the males and the shock absorbers,

- removal, ordinary or extraordinary maintenance activities and subsequent re-installation of all the other gates currently installed in the barrier. At the end of the Second Phase, the last two maintenance gates will be transported by the Company to the Arsenal and stored there, as respect gates.

Since this is an experimental activity, the actual needs will emerge only after the completion of phase 1; for this reason the services relating to phase 2 may be subjected to technical adjustments.