Construction services, namely, for construction of environmental protection and remediation systems, waste storage facilities, bioremediation cells, ponds, barrier walls, bentonite slurry trenches, funnel and gate technologies and cut-off and recovery trenches; Construction services, namely, for construction of anchor systems and shoring systems comprised of soldier piles and lagging walls, soil nails and tangent pile walls, cast in place piles and permanent shoring walls, temporary excavation and support systems, emergency containment walls, excavation dewatering systems, micro and Gewi piles, corrosion protected anchors, multiple grounding systems, tie back anchors, bar strand anchors, small diameter driven pipe piles, limited access capabilities for seismic upgrading, namely, reinforcements against earthquake damage and high capacity soil and rock anchors; Repair and maintenance services for oilfield parts and equipment, namely, repair and maintenance of casing scrapers, chokes, various valves, pumps, gaskets and flanges; Oil and gas well maintenance and workover services, namely, repairs and modifications to wells to enhance production, including casing repairs and well acidization and fracturing services; Repair and maintenance services, namely, repair and maintenance of drilling fluid systems, inhibitive mud systems, Steam Assisted Gravity Drainage (SAGD) systems and foam drilling systems