The Purpose Of This Tender Is To Contract The Necessary Services To Carry Out A Correct Exploitation, Conservation And Maintenance Of The Sanitation Systems Of The Ribera D'Ebre Group (Ascó, Flix, Garcia, Ginestar, Móra D'Ebre/Mora La Nova, The Palma D'Ebre, Rasquera, Riba-Roja D'Ebre, The Torre De L'Espanyol, Vinebre And Tivissa), According To The Torre De La Espanyol). (Pptp) That Guarantees The Achievement Of The Quality Objectives Set In It And That Fulfill The Requirements Of Directive 91/271/Eec Of The Council, Of May 21, 1991, On The Treatment Of Urban Wastewater And The Royal Decree 509/1996, Of March 15, On The Development Of The Royal Decree-Law 11/1995, Of December 28, For Which The Applicable Rules Are Applicable, Of Urban Wastewater.