Poland – Sewage-treatment plant construction work – Modernizacja wraz z rozbudową oczyszczalni ścieków w Marczycach

The subject of the contract is the modernisation and expansion of the sewage treatment plant in Marczyce (plot no. 11/5, 180/1) as part of Stage I, with the simultaneous maintenance of the old facility (plot no. 12/12) and its decommissioning after the new installation is commissioned. 2. For the subject of this contract, the formula "Design and Build" applies - which means that the contract element, treated as Stage I, is the comprehensive, complete design of the project understood as complete design, cost, and technological documentation, along with detailed Technical Specifications for the Execution and Acceptance of Building Works (STWiORB/WWiORB) subject to approval by the Contracting Authority and other, not listed - necessary for the correct commissioning of the facility and obtaining decisions, permits and other legal documents - required for this type of facility. 3. The subject of the contract in the "Design and Build" formula covers the physical and full-sector implementation of Stage I of the investment, ensuring the full technological functionality of the facility up to a capacity of 12,500 RLM, whereby the Contractor is obliged to include in the design documentation and implement in the infrastructure of Stage I land and technical reserves for potential future expansion according to the following rules: 1) The design documentation (building, technical and execution projects) prepared by the Contractor concerns only the facilities and installations implemented as part of Stage I. 2) At the planning and land development stage, the Contractor is obliged to provide for space and land reserves, which means such location of Stage I facilities on the investment plot that in the future it will be possible to expand the treatment plant with further technological lines without the need to demolish or rebuild the infrastructure erected in this contract. 3) In the field of installations, the Contractor is obliged to design and implement as part of Stage I physical technical reserves prepared for future connection of the expansion, which means the absolute obligation to install blind collars, isolating valves, free connection stubs, and also to leave reserve capacity on the main switchboards, free cable routes, and a minimum of 25% space and signal reserve in the control cabinets and the superior SCADA system. 4. The subject of the contract - Stage I - involves the construction of a new mechanical-biological sewage treatment plant in Marczyce on plots no. 11/5, 180/1, with a capacity of RLM = 12,500 and an average daily flow rate of Qd = 1,630 m³/d. This stage includes ensuring the full capacity to accept transported sewage in quantities up to 100 m³/d and its buffering in a dynamic system (through synchronised operation of the pumping station and emptying pumps) using the existing adapted retention facility. Safe acceptance of increased instantaneous flows during intense rainfall up to Qm = 280 m³/h (77.8 l/s). The scope of this stage also includes maintaining the continuity of operation of the existing facility on plot no. 12/12 and its complete decommissioning and conservation after the stable commissioning of the new installation. An integral part of Stage I (within the lump sum price) is the complete implementation of the system for discharging treated sewage to the receiver. The basic solution is to discharge treated sewage to the Czerwonka stream. As part of the implementation of the investment, the Contractor is obliged to carry out a detailed hydrological analysis and an analysis of the capacity of the existing outlet to the Czerwonka stream (for which the procedure for extending the water permit for discharging treated sewage for the existing treatment plant is in progress), in terms of the technical possibility of using it to receive the designed quantity of water. 5. In the event that the hydrological analysis and capacity analysis show that it is not possible for the existing outlet to receive the quantity of treated water planned for Stage I, the Contractor is obliged to design and implement an alternative, complete gravity-pressurised system to the Podgórna stream as part of Stage I of the investment. The above-mentioned system includes the construction of a 250PE SDR11 PN16 pressurised pipeline and a DN400 PVC SN8 gravity section with a DN 400 outlet structure in a stone wall at km 3+311 of the Podgórna stream, running through plot no. 11/5 (Marczyce) and plots in the locality of Podgórzyn (nos: 355/2, 509/5, 627/4, 468/1, 473/14, 462/9, 330/8, 532/2, 536/3 and 536/2). 6. The subject of the contract includes: 1) within the scope of the basic contract: a) preparation of design documentation (conceptual, building, technical and execution) for the final scope of investment implementation along with obtaining the necessary agreements, opinions, permits and decisions, including the building permit, b) construction of the sewage treatment plant, training, commissioning, testing, handover for operation and use (a permit for use is required). 2) within the scope of the contract under the right of option: a) construction of a complete gravity-pressurised system to the Podgórna stream; b) removal of collisions with overhead lines SN 20 kV will take place if, in the design phase, the detailed location of the facilities shows a physical or normative collision with the overhead power line of the operator TAURON Dystrybucja S.A. A detailed description and method of contract implementation is contained in the Functional-Operational Programme (hereinafter: "FOP") constituting Annex No. 11 to SWZ.