## 6 Geotechnical Conditions of the Test Sites  
This paper includes the test results of mineral and organic subsoils obtained from the Antoniny, Koszyce, and Mielimaka sites located in the Notec river valley in the Wielkopolska province, the Nielisz site located in the Wieprz river valley in the Lublin province, and the SGGW Campus and Stegny sites located in Warsaw, where the Department of Geotechnical Engineering SGGW is located, and where a laboratory and field testing program has been carried out under and outside of the main dam embankment [33; 34] (Figure 2). The grain-size distribution curve obtained from laboratory tests for mineral soils from these sites is presented in Table 1 (Figure 3). All the test sites are located in Poland. Figure 2: Location of test sites in Poland (all the test sites are located in Poland). This paper presents the test results of mineral and organic subsoils obtained from the following sites: Antoniny, Koszyce, Nielisz, Stegny and Warsaw University of Life Sciences (WULS)-SGGW Campus. The Antoniny test embankment was designed and performed in the frame of cooperation between the Department of Geotechnical Engineering SGGW and the _Swedish Geotechnical Institute_ (SGI). The physical properties of soil from the Antoniny site were determined during earlier WULS-SGGW tests [33; 34; 35; 36]. The Koszyce test dam is located in the Ruda river valley. In the central part of the dam subsoil, a layer of soft organic soils was discovered. The organic soils are Quaternary deposits of an oxbow lake [33; 34]. The Nielisz site is located in the Wieprz river valley in the Lublin province, the SGGW Campus site is located within the Department of Geotechnical Engineering SGGW, and the Stegny site is located in Warsaw, where a laboratory and field testing program was performed under and outside the main dam embankment [34; 35]. The area of the SGGW campus is located in the southern part of Warsaw in the Ursynow commune. It is limited by: the Nowouvsynowska street 166 from the north-east, Ciszewskiego street from the south-west, Rosola street from the south-east, and the area of forts, behind which the Shuzewiecka valley runs, from the north-east. At a distance of about 700 m from the plot, toward the north-east, runs the edge of the Vistula escarpment (nature protection area). At a distance of about 700 m to the south-west runs Warsaw Metro I line [37]. The \"Stegna\" experimental field was founded by an academic center, following two research projects of the Scientific Research Committee implemented by the Department of Engineering Geology of the University of Warsaw and the Department of Geoengineering SGGW at the Warsaw University of Life Sciences. It is located in the southern part of the city of Warsaw, in the Mokotow district, at the Stegny housing estate. The soils that are subject to the presented research are Mio-Piocene clays, belonging to the Poznan Formation. The location of all analyzed objects is shown in Figure 2. The index properties of mineral and organic soils and the grain size distribution curve obtained from laboratory tests for mineral soils from the described sites are presented in Table 1 and Figure 3.  
Table 2 was compiled based on the results obtained from the analysis of well profiles and dilatometer tests. It contains data used to compare the unit weight of mineral and organic soils obtained from laboratory tests based on DMT results from the Antoniny, Koszyce, Nielisz, Stegny and WULS-SGGW campus sites. Data of dilatometer test readings (DMT), effective vertical stresses \(\sigma_{\rm{vo}}\), water pressure \(u_{o}\), and soil unit weight (\(\gamma\)) from laboratory tests were collected for each study site. Individual soil fractions (\(f_{clay}\),\(f_{silt}\) and \(f_{sanl}\)) and corresponding pressures from the dilatometer, such as pressures (\(p_{0}\), \(p_{1}\)) and dilatometer indexes (\(l_{D}\), \(k_{D}\) and \(E_{D}\)), were also collected. The preconsolidation ratio (\(OCR\)) of these soils generally ranged from 1 to 3 across most of the subsoil profile.