Negotiated Tender Procedure, Without Prior Publication Of The Notice Pursuant To Art. 50 Paragraph 1 Letter. E), For The Awarding Of The Annual Supply Of Drainage, Divided Into 9 Tender Lots, Necessary For The Needs Of The Asl 1 Avezzano, Sulmona, L'Aquila, To Be Awarded In Application Of The Lowest Price Criterion.