National Response Corporation (NRC) announced today the completion of the purchase of RK Contractors (RK) through an asset deal. NRC is a commercial provider of United States Oil Pollution Act of 1990 regulatory compliance and emergency response services as well as a global provider of diversified environmental, industrial and emergency response solutions. Headquartered in Great River, N.Y., with regional offices throughout the U.S. and internationally, NRC has approximately 765 employees. RK is a specialty environmental and industrial services contractor in the Northern California and Nevada region of the United States. The Company is headquartered in Truckee, Calif. and as part of the transaction now has a branch office in Reno, Nev.