Grupo Graña y Montero S.A.A. is a Peruvian engineering and infrastructure holding company operating in Latin America. Through its subsidiaries, it is engaged in the operation of oil fields; drilling of oil and gas wells; storage and distribution of hydrocarbons; operation of terminals and pipelines; and processing of natural gas. The company, among other things, also develops industrial projects, and operates and maintains highways. In 2010 the company, together with Spanish firm Acciona S.A., won a concession to build and operate the La Chira wastewater treatment plant. The facility will treat a quarter of all the wastewater produced in Lima and neighboring port city Callao. Graña y Montero was founded in 1933 and is based in Lima, Peru.