This project complements and completes the integrated management of urban sewage in Spetses, including collection, transport, treatment, and disposal. This need arose during the construction of the sewage pipeline in the area of ​​the Ancient Baths, where antiquities were found, so the pipeline could not be constructed at the depths specified in the project study. Therefore, in the context of finding alternative solutions, taking into account the slopes of the area, the excavation depths, the limited space for work execution, and the possibility of draining adjacent properties, the Service deemed the construction of this network segment as a suction network as the most suitable solution.

The relevant construction works of the remaining network include the construction of gravity sewer pipes from structured wall plastic pipes in open trench, with a total length of 19,245.00 m; the construction of pressure sewer pipes from polyethylene segments in open trench, with a total length of 970.00 m; the construction of inspection chambers using precast concrete circular manholes, totaling 637 pieces; the construction of inspection chambers using precast synthetic material manholes, totaling 44 pieces; and the construction of a vacuum sewer network, including the preparation of its implementation study.

The adjustment of the Acharnes stream (Kanapitsa) is undertaken for a length of 12.6 km, from its outfall to the Kifissos river, M.P. 0+000, to M.P. 12+586 in the area of Thrakomakedones and Acharnes, on the southern slopes of Mount Parnitha. This is an important flood protection project, given the frequent occurrences in the area.

The works include the adjustment of the natural bed of the stream in sections, with an open cross-section using wire gabions at a total length of approximately 7.5 km; a closed box culvert is planned for a total length of 2.3 km, of which 1 km concerns existing drains. No interventions are proposed in the protected areas of Mount Parnitha, where the natural cross-section is preserved unchanged.

The project involves the restoration of the landfill (Solid Waste Disposal Site) at the location of Lachni, in Kythira, to comply with current environmental standards. The process unfolds in two phases, each contributing to the overall goals of the project.

The first phase involves technical interventions for the restoration of the landfill, including earthworks for systematic waste collection, terrain shaping and leveling, final cover works, stormwater management, drainage, and biogas management, along with landscaping and irrigation works for landscape reclamation.

The second phase focuses on the construction of solid waste landfills in Kythira and smaller landfills in Antikythira. Key activities include earthworks for site shaping, waterproofing, and addressing environmental impacts. Supporting infrastructure works are developed for the Kythira landfill, including appropriate slopes for stability and optimizing the space capacity. The waterproofing system consists of a geological barrier, rear layer, waterproofing membrane, geosynthetic drainage layer, geotextile, and protective gravel material. Drainage systems are connected to settling tanks for effective waste management. This phase also includes the fencing of the construction site, road access network construction, installation of lighting network, administration buildings, creation of irrigation tanks, fire infrastructure, water supply systems, metal workshop building, fire protection zone planning, creation of a biogas management system, firefighting network, flood trenches, and environmental monitoring initiatives.

The new seawall, measuring 110 m in length, is replacing the former western seawall, which suffered irreversible damages, including collapse along a section. With a useful depth of at least 3 m, the seawall is constructed to serve pleasure boats up to 15 m in length at the port of Poros.

The project involves the construction of flood management works in three streams in the city of Loutraki -Katounistra, Prathi, and Kareli- to address past flooding issues. The works include channel excavation, local investments, outlet works, construction of sediment retention structures, as well as the necessary technical works of open and closed rectangular cross-sections at their most significant points and intersections with major roads.

Works on the Katounistra stream include channel management works from M.P. 0+000 to   5+492.1, technical works for road crossings of the stream, sediment retention structures, and outlet works with concrete bed and protection with boulders. In the Prathi stream, channel management works from M.P. 0+082 to M.P. 7+544.2, technical works for road crossings of the stream, sediment retention structures, and outlet works with concrete bed and protection with boulders are included. In the Kareli stream, channel management works from M.P. 0+000 to M.P. 0+700.8, technical works for road crossings of the stream, sediment retention structures, and outlet works with limited intervention with wire gabions to shape the junction of the Kareli stream with the Prathi stream are included. Additionally, channel management works, and their accompanying structures are constructed in the Katounistra stream over a length of 5,492.10 m, in the Prathi stream over a length of 7,462.20 m, and in the Kareli stream over a length of 700.80 m.

The project involves the maintenance and improvement of roads in the Municipality of Salamina, including the maintenance of existing asphalt pavement and primarily the removal and construction of asphalt wearing courses for traffic. Maintenance works aim solely at restoring damages and defects or generally returning the roads to their original condition, rather than fundamentally modifying their characteristics.

Concrete-paved road reconstruction works are carried out in the area of Kanakia, where the complete reconstruction of the pavement is planned on 28is Oktovriou Street, as well as in the broader area of Aianteio. Regulatory signs R-2 (STOP) are installed at road accesses perpendicular to priority roads of the main network: Faneromenis Avenue, Vasilikon Avenue, Peristerion Avenue, Dimokratias Avenue (Narrow), Resti Avenue, Aianteio Avenue, Kaki Vigla Avenue, Salamina Avenue, etc. Additionally, signs indicating dangerous locations are installed on the same streets.