Advance Info 261Preliminary Inquiry (PI) to identify and select companies that are interested in and capable to provide maintenance services for the water treatment plant and water transportation services for the ALMA Observatory, located close to San Pedro de Atacama, Chile. The scope of the services includes 2 lots:Lot 1: Water transportation services, including:- Transportation of potable water required for the operation of the Observatory from Calama and/or San Pedro de Atacama. - Transportation of Industrial water from Calama and/or San Pedro de Atacama to the Observatory. Lot 2: Water treatment plant maintenance, including:- Operation and maintenance of the water treatment plant. - Testing and certification of sludge from the water treatment plant.