HEAVY CONSTRUCTION AND UTILITIES INSTALLATION, NAMELY ROCK BLASTING AND EXCAVATION; ROAD CONSTRUCTION; INSTALLATION AND REBUILDING OF MANHOLES; INSTALLATION OF WATER, SEWER, ELECTRIC, GAS AND COMMUNICATION LINES; DAM CONSTRUCTION; INSTALLATION OF COMMUNICATIONS ENVIRONMENTAL VAULTS; FIBER OPTIC CABLE INSTALLATION; CONSTRUCTION OF DRAINAGE AND RETENTION SYSTEMS; EXCAVATION, REMOVAL AND REPLACEMENT OF CONCRETE; PAVING PARKING AREAS AND ROADWAYS; POURING OF CONCRETE FOUNDATIONS; INSTALLATION OF ...