Slovakia – Construction work for water projects – Obnova vodozádržných opatrení

The subject of the contract is the implementation of construction works aimed at the restoration, modification and supplementation of water retention measures in the forest environment on the territories within the jurisdiction of the individual organizational units of the company LESY Slovenskej republiky, štátny podnik. The contract includes the implementation of 124 projects according to the project documentation and the relevant measurement reports. The purpose of the implementation is to restore and increase the ability of the forest environment to capture and retain rainfall, slow down its surface runoff and support its gradual infiltration into the soil. The proposed measures also contribute to mitigating water erosion, limiting soil and sediment transport, protecting the forest transport network and supporting the natural water regime of the country. Their implementation will support the ecological stability, biodiversity and resilience of forest ecosystems to the adverse effects of climate change, especially drought and intense rainfall. The contract is divided into three separate parts according to the territorial affiliation of the projects: Part No. 1: Restoration of water retention measures – Western Slovakia (OZ Karpaty, Považie, Podunajsko, Tribeč) - 29 projects Part No. 2: Restoration of water retention measures – Central Slovakia (OZ Gemer, Horehronie, Sever, Poľana) - 47 projects Part No. 3: Restoration of water retention measures – Eastern Slovakia (OZ Tatry, Šariš, Východ, Vihorlat, Ulič) - 48 projects. The nature and purpose of the construction works are the same in all three parts of the contract. The individual parts differ in the location of implementation, the number of projects, local conditions and the specific technical and quantitative scope of the measures determined by the project documentation. The construction works will be mainly carried out on the existing forest transport network, in its adjacent territory and on other areas defined by the project documentation. They include the restoration of the functionality of existing water retention elements and the implementation of supplementary measures to capture, direct, disperse and infiltrate surface runoff. According to the technical solution of the individual projects, the subject of the contract mainly includes: a) Restoration and supplementation of roadside drains and gutters, which interrupt the concentrated surface runoff of water on forest roads and direct it into the adjacent forest environment or into connecting infiltration elements. This includes necessary excavations, base and bedding layers, installation and securing of elements, possible concreting and adjustment of the affected surface of the communication. b) Cleaning, repair, restoration or supplementation of pipe culverts and their accessories, including adjustments to inlet and outlet parts, removal of deposits, necessary earthworks, beds, backfills, embankments and connecting reinforcements, to the extent determined by the relevant project. c) Construction or restoration of infiltration pits, ponds, ditches and trenches, which ensure local capture of rainfall, its temporary retention and gradual infiltration. This includes adjustments to inlets and outlets, terrain modeling and necessary stabilization measures. d) Anti-erosion and stabilization adjustments, mainly adjustments to erosion gullies, rills, slides and damaged sections of skid trails, construction of wooden steps and platforms, stone reinforcements and other structures to slow down runoff and limit the transport of sediments, if their relevant project documentation includes them. e) Associated local adjustments to forest roads, access and maneuvering areas, necessary for the functional connection of water retention elements, stabilization of affected sites and ensuring their operability. f) Completion of terrain and vegetation adjustments, mainly leveling of affected areas, backfilling of the humus layer, anti-erosion seeding and other adjustments according to the project documentation. The above calculation represents a common framework of possible works within the contract. The specific types of measures, their design and material execution, dimensions, quantities and locations are determined individually for each project. Individual projects may not include all the types of work mentioned. The subject of the contract includes the supply and installation of necessary materials and products, the provision of labor, machinery and equipment, transport and relocation of materials, as well as preparatory, auxiliary and completion activities necessary for the proper execution of the works within the scope of the project documentation, measurement reports and contractual conditions. The implementation also includes the provision and marking of workplaces, protection of existing facilities and vegetation, handling of excavated materials and waste, ongoing maintenance of cleanliness of affected communications and final cleaning and adjustment of workplaces. The delivery will include the relevant documents on the quality of the materials used and the works carried out, the results of the required tests and other documentation within the scope set by the contract. When carrying out the works, it is necessary to take into account the forest character of the area, terrain and access conditions, existing drainage conditions and requirements for the protection of soil, water, trees and other natural components. The organization and technological procedures of the construction must limit the damage to the surrounding environment and respect the conditions of the relevant decisions, opinions and other bases relating to the specific project. The detailed definition of the subject of performance is the list of projects assigned to the individual parts of the contract, project documentation including technical reports and drawing documentation, relevant measurement reports and contractual conditions. These bases together determine the required scope and manner of execution of the construction works. The general description applies in conjunction with the mentioned bases and does not extend the scope of the individual projects to include measures that are not included in them.