Abstract: Geotechnical investigations conducted for the construction of the channel at the proposed location of the street Šušnjevec collected relevant geological and geotechnical data for the design and execution of the underlying project. According to the basic geological map the location is in the area that make up the upper Pannonian sediments. Terrain categorization according to the slope stability, which was part of the Geotechnical screening showed that the route and the area around it are located in second category of stability - conditionally stable slopes. Conditionally stable slopes are stable under natural field conditions, but during the process of constructing buildings the slopes can become unstable. For this reason geotechnical investigations for determination of construction on slope and building foundation conditions were required. Geotechnical investigations consisted of field investigations and laboratory tests. In this case, the field investigations consisted of engineering and geological work and exploration drilling (8 wells along the route) within which the field identification and classification of core, engineering-geological determination of core, sampling and standard penetration test (SPT), installation piezometric and inclinometer tube in wells are performed. The geotechnical laboratory determined the physical and mechanical properties of the damaged and intact samples. By engineering-geological mapping and exploration drilling, cover layers (humus, embankment and diluvial drift) and ground layers (sandstone, marl, limestone and limestone breccia) have been identified. 3 cross-section analyzed regarding to the existing slope stability and slope stability for the phase of the excavation and laying of sewer pipes were selected. Ground water is not registered by research works and according to the analysis of terrain its occurrence is not expected, so the calculation is not taken into account. Stability calculation was performed by computer program GEOSTUDIO 2004. On the basis of the analysis it was determined that the slopes in the pipeline laying area was stable. The exception is the slope above the road at the beginning of the section that is currently stable, but the signs of instability should be expected due to the dynamic impact during trench excavation. Therefore, the retaining wall along the edge of the road has been proposed, which would ensure the permanent stability of the slope. Thesis is concerned with the calculation of retaining wall stability and defines its dimensions. The calculation has been performed according to the guidelines of Eurocode 7 through three different approaches (PP1, PP2, PP3) that have been compared to each other on the basis of obtained results.