| Class 4221: Construction of utility projects for fluids |
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| This class includes the construction of distribution lines for transportation of fluids and related buildings and structures that are integral part of these systems.
This class includes: - construction of civil engineering constructions for: • long-distance and urban pipelines • water main and line construction • irrigation systems (canals) • reservoirs - construction of: • sewer systems, including repair • sewage disposal plants • pumping stations |