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Construction and maintenance 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, site clearing, excavation services, grading, compaction of soil, pad construction, construction and maintenance of drainage pipeline, utilities installation and maintenance, concrete construction, equipment and vessel placement, installation of mechanical piping and structural steel, road construction, application of coatings and sealers, 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 pipeline and utilities, namely, site clearing, excavation services, grading, compaction of soil, pad construction, installation and maintenance of drainage pipeline, utilities installation, finish grading and site gravel installation, maintenance and repair services for underground drainage pipeline, pipeline, and utilities; 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