Description: This industry comprises establishments primarily engaged in heavy and civil engineering construction projects (excluding highway, street, bridge, and distribution line construction). The work performed may include new work, reconstruction, rehabilitation, and repairs. Specialty trade contractors are included in this industry if they are engaged in activities primarily related to heavy and civil engineering construction projects (excluding highway, street, bridge, distribution line, oil and gas structure, and utilities building and structure construction). Construction projects involving water resources (e.g., dredging and land drainage), development of marine facilities, and projects involving open space improvement (e.g., parks and trails) are included in this industry. Illustrative Examples: Channel construction Land drainage contractors Dam construction Marine construction Dock construction Microtunneling contractors Dredging (e.g., canal, channel, ditch, waterway) Nuclear waste disposal site construction Earth retention system construction Flood control project construction Park ground and recreational open space improvement construction Railroad construction Golf course construction Subway construction Horizontal drilling (e.g., cable, pipeline, sewer installation) Trenching, underwater Hydroelectric generating station construction Tunnel construction Cross-References. Establishments primarily engaged in--