## 5 Conclusions
The maximum permissible values for the size of the explosive charge determined in this way can only be used with aperture blasts with a burden of 4.0 m and a bore spacing of 4.2 m.  
The analysis of the seismic effect measured in the blasts No. 693-698 in Trebejov Quarry showed that the greatest attenuation of the seismic waves induced by the technical seismicity was achieved at millisecond timing delays of 15 and 20 ms. The lowest peak particle velocity values of 0.53 mm.s\({}^{-1}\) in a residential building were recorded at a millisecond timing delay of 20 ms at blast No. 698. According to the valid Slovak Technical Standard STN EN 1998-1/NA/Z1, the seismic load of buildings, according to these measured values, did not cause any damage to buildings in the municipality of Trebejov. The measured values did not exceed the lowest value specified by the valid Slovak Technical Standard STN EN 1998-1/NA/Z1; the seismic load of the buildings was v = 3 mm.s\({}^{-1}\) for frequencies lower than 10 Hz and for the foundation soil of type b (Table 3). These values are safe from the point of view of the seismic safety of the buildings and their residents. In personal interviews, residents confirmed that they did not perceive such vibrations as dangerous. The analysis showed that the lowest values of the acceleration at the building were achieved during a millisecond timing delay of 20 ms. The highest values of vibration acceleration, \(\mathrm{a_{wmax}}=0.078\) m.s\({}^{-2}\),were measured at a millisecond timing delay of 1 ms. The measured maximum values of the acceleration for all blasts did not exceed the limit value, \(\mathrm{a_{wmax}}=0.11\) m.s \({}^{-2}\), which is defined by the hygienic standard for the inhabitants of the building. The inhabitants of the building who were present at the research blasting operations did not perceive these vibrations as dangerous. The results achieved by the research blasts were validated during the blasts in Trebejov Quarry (Table 7). These blasts were monitored at the same monitoring point as the research blasts. The millisecond delay applied at these blasts was determined by the velocity propagation and frequency of the seismic waves in the rock environment at different stages of Trebejov Quarry. The timing delays of 17 and 25 ms proved to be the correct solution for the individual parts of the quarry with different violations of the rock massif. Applying the modifications of millisecond timing and monitoring of the blasts in the quarry enabled us to identify in an experimental way the optimum interval of the values of the particle velocity and its frequency which could not harm the inhabitants. The results achieved when monitoring the blasts in Trebejov Quarry proved that the limit value for the particle velocity is appropriate as \(\mathrm{v_{d}}\leq 2\) mm.s\({}^{-1}\), which is suitable for the inhabitants as well. The inhabitants of the monitored housing object who were present at the blasting operations did not perceive the blasts as dangerous. Within this research, a series of six research blasts was performed in Trebejov Quarry, whereas the seismic impact of these blasts on the residential buildings and their inhabitants in the village of Trebejov was measured. The research was carried out in order to ensure that the seismic effects of blasting in Trebejov Quarry do not cause any damage to residential buildings in the village of Trebejov and especially that the inhabitants do not perceive these seismic effects as dangerous. The research on the impact of the charge timing and parameter alteration of the blasts on the seismic effects of the blasting works will be further carried out by applying research blasts in Trebejov Quarry. Concurrently, this research will be focused on a further quarry in Vcelare, where similar research blasts will be carried out in a different environment and with other parameters. **Author Contributions:** Conceptualization: [PERSON] and [PERSON]; methodology: [PERSON] and [PERSON]; software: [PERSON] and I.B.