Installation of wastewater pipes and sewers of different materials in open construction with the associated structures, in particular at a characteristic depth of the excavation pit bottom of more than 5 m under difficult conditions²⁾ and using technically demanding construction methods³⁾. 

Quality mark holders of group AK1 meet the requirements of groups AK2 and AK3.

Installation of wastewater pipes and sewers of different materials in open construction with the associated structures at a characteristic depth of the excavation base of up to 5 m, also under difficult conditions^2).

Execution area AK2 is a constituent part of execution area AK1.