The project concerns the completion of the construction of the collection, transport, treatment and disposal projects of the Polygyros and Kalyves settlements of the Municipality of Polygyros and is implemented with 5 distinct Subprojects. Specifically includes:- Subproject 1: A) Construction of a remaining part of the internal drainage system in the settlement of Kalyves (gravitational pipelines) and transmission pipelines until the Wastewater Treatment Plantation (LF) Polygyros-Calyves (depressive pipelines). Construction of 3 pump stations.B) Construction of an internal sewerage network of Polygyros settlement and the remaining part of the transport network up to Polygyros-Kalyves. Construction of 2 pump stations. Subproject 2: Construction of Polygyros Kalyves SEL, with a capacity of 17.000 lk, with direct recipient of adjacent stream.- Subproject 3: Technical Advisor services for the support of the Municipality of Polygyros during the implementation of the second phase of the project.- Subproject 4: Expenditure on archaeological supervision of excavations.- Subproject 5: Electricity costs of the 5 pump stations and the SPD.