ACQUISITION OF READY-MIX CONCRETE FC 280 kg/cm2 FOR THE EXECUTION OF THE WORK EXPANSION OF THE DRINKING WATER SERVICE DISTRIBUTION NETWORK SECTION: PTAP - HOSPITAL SAN MARTIN DE - ACQUISITION OF READY-MIX CONCRETE FC 280 kg/cm2 FOR THE EXECUTION OF THE WORK EXPANSION OF THE DRINKING WATER SERVICE DISTRIBUTION NETWORK SECTION: PTAP - HOSPITAL SAN MARTIN DE PANGOA AND SANITARY SEWERAGE SECTION: HOSPITAL PUTUMAYO IN THE POPULATED CENTER OF VILLA MARIA - PANGOA - SATIPO - JUNIN (EXPIRED)