каждой из этих схем характерно нали

каждой из этих схем характерно наличие вредностей и опасностей, которые сопровождают технологический процесс при реконструкции, ремонте и замене существующих водопроводных сетей.

Results (English) 1:

each of these schemes is characterized by the presence of hazards and dangers that accompany the process in the reconstruction, repair and replacement of existing water systems.

Results (English) 2:

each of these schemas are characterized by the presence of impurities and the dangers that accompany the process of reconstruction, repair and replacement of the existing water supply networks.

Results (English) 3:

Each of these schemes are characterized by the exposure increases and the dangers that accompany technological process with the reconstruction, repair, and replace existing water networks.