Acquisition Of 6" To 8" Cornerstone Placed On Site, For The Work: Construction Of Waste Cells In The Sanitary Landfill District Of Yura, Province Of Arequipa ¿ - Acquisition Of Cornerstone From 6" To 8" Placed On Work, For The Work: "Construction Of Cells For Waste In The Sanitary Landfill District Of Yura, Province Of Arequipa"