Riddle Construction, 610 Martin Rd, Woodward, OK 73801, US

Diamond Services Company, established in 1958, undertakes construction and maintenance of oil and gas pipelines throughout Oklahoma. Its areas of expertise include pipeline design and installation; plant and compressor station fabrication; and line repair and lowering. The environmental services offered by the company include emergency spill response, power washing, contaminated soil excavation and transportation, vessel and tank cleaning, soil boring and sampling. The additional services offered by the company include construction, grading, excavating, mechanical maintenance, chemical handling and solids removal. It also maintains a fleet of forklifts, cranes, and flatbed and bottom dump trailers and provides soil hauling and interstate commercial transportation services. Diamond Services Company is headquartered in Woodward, Okla.