Construction, maintenance, and construction project management services in the heavy civil construction field, and in the fields of oil and gas exploration and production; pipeline construction and maintenance; construction and maintenance of facilities in the oil and gas industry, namely, surveying, seeding and soil stabilization, land clearing, excavating, grading, compaction, pad construction, drainage, pipeline, and utilities installation, concrete, equipment and vessel placement, fabrication and installation of mechanical piping and structural steel, road construction, blasting and coating services, finish grading and site gravel installation, final grouting of compression equipment, pressure testing of all mechanical piping systems, maintenance of flow lines and flow equipment; construction and maintenance of underground drainage, pipeline, and utilities, namely, seeding and soil stabilization, site cleaning, excavating, grading, compaction, pad construction, drainage, pipeline, and utilities installation, finish grading and site gravel installation, maintenance and repair services for underground drainage, pipeline, and utilities systems; oil field construction services in the nature of roustabout services, namely, assembling and repairing oil field machinery and equipment, and well site preparation and maintenance; installation, repair, and maintenance, and field servicing of artificial lift systems and components, namely, wellhead drives, power units, and hydraulic and electric systems for use in the oil and gas industry