## 5 Conclusions  
On the basis of the in-situ tests conducted, the following conclusions are made. * The peak component particle accelerations (PPAi) recorded on the ground in three mutually perpendicular directions (x, y, and z) along the adopted measurement profile were usually two to three times higher when a tri-band hydraulic compactor type V8 from MTS was used than in the case of working at the same distances and on the same depths of the vibratory plate compactor type DPU 6055 from Wacker Neuson. For example, in the case of compaction taking place in closest vicinity of the building (stage III, Ls = 5 m) and recording data on the ground at the measuring point 4B (L4B = 3.75 m), the maximum PPAi values designated for the MTS V8 compactor operating in X1 mode were: PPAx = 6.580 m/s\({}^{2}\), PPAy = 1.928 m/s\({}^{2}\), PPAz = 12.215 m/s\({}^{2}\). The corresponding values obtained for the DPU 6055 compactor were: 2.094 m/s\({}^{2}\), 1.108 m/s\({}^{2}\), and 3.571 m/s\({}^{2}\). * In general, in the case of the MTS V8 hydraulic compactor, the highest level of PPA vibrations recorded on the ground was obtained while the device was in X1 mode (operating frequency 38 Hz, centrifugal force of 90 kN). Smaller values were obtained when the machine was in X2 mode (45 Hz, 50 kN), the smallest--in X3 mode (60 Hz, 90 kN). * The results of the measurements showed that surface vibrations, the source of which were the reversible plate compactor and the hydraulic compactor MTS V8, spread over a much greater distances than would result from the known theoretical dependence on the geometrical attenuation and absorption of vibrations in the ground. This fact should be explained by a more complex than assumed nature of the wave process occurring in the ground soil, and a greater inhomogeneity of the ground. * The level of vibration acceleration generated during the operation of a vibrating plate compactor type DPU 6055 and recorded on the building was generally lower than in the case of the hydraulic compactor MTS V8. However, only a few cases were observed in stages I and II, when the reversible plate compactor generated higher peak component particle accelerations (PPAi), as recorded on the foundation wall of the building. This is the case with the corresponding example of the PPAx values generated by the DPU 6055 compactor and the MTS V8 compactor operating in X3 mode, at a distance of 15 m from the building, and at a compaction depth of h = 0.4 m (stage I: 0.111 m/s\({}^{2}\) > 0.079 m/s\({}^{2}\), Table 2), and PPAz values in the case of compactors operating at a distance of 10 m from the building and at a depth of 1.2 m (stage II: 0.486 m/s\({}^{2}\) > 0.079 m/s\({}^{2}\)--MTS V8 in X2 mode, Table 3). * Despite the fact that the vibrations in the building were clearly felt, and the assessment of their impact on the building carried out according to Polish standard PN-B-02170:2016-12 [28] indicated the possibility of at least cosmetic damages, visual inspection of the building did not yield even the smallest defects. Therefore, it should be concluded that an approximate assessment of the impact of vibrations transmitted by the ground surface on buildings carried out using the dynamic impacts (SWD) in accordance with the guidelines of the Polish standard may lead to too much of a cautious evaluation in similar cases. * An assessment of the impact of vibrations transmitted by the ground surface on the building, based on the German standards DIN 4150-3:1999 [23], British BS 7385-2:1993 [25] and BS 5228-4:1992 [26] and the Swiss VSS- SN640-312a:1992 [27], showed a practical lack of impact of the work of the MTS V8 hydraulic compactor and the vibrating plate compactor DPU 6055 to deteriorate the technical condition of the building--regardless of the distance between compactors from the building (in the range of 5 m to 15 m), and the depth at which work-related to compaction of soil was carried out (to a depth of 1.8-2.0 m).