Tenders Are Invited For Securing The Sand Landfill At Knaben According To Ns8406 in Norway

Work Detail

Securing The Sand Landfill At Knaben According To Ns8406 . Descriptionthe Tailings Landfill (Knabensanden) At The Closed Knaben Molybdenum Mines Results In The Runoff Of Fine-Grained Tailings (Sand And Silt) To The Watercourse Below. The Purpose Of The Assignment Is To Implement Lasting Measures That Prevent This Runoff. Knaben Molybdenum Mines Were Closed In 1973, And Have Left Behind A Tailings Dump. The Waste Is The Worthless Part Of The Ore, And Consists Of Fine Mineral Particles. The Landfill Covers An Area Of ​​Around 300 Acres, And Has A Thickness Of Up To 20 M. Safeguarding Work Has Previously Been Carried Out In Connection With The Landfill, At The Beginning Of The 2000S And In 2011-2012. It Is Both Sand Drift And Erosion That Carry Sand From The Landfill To Waterways Downstream Of The Landfill, Primarily To Store Knabetjønn. Asplan Viak Has, On Behalf Of The Norwegian Environment Agency, Prepared A Plan With Drawings And A Description Of The Measures That Are Now To Be Carried Out. Planned Measures Are To: • Empty The Sand Catchment In Store Knabetjønn • Clean Up Established Drainage Channels Around The Landfill, To Direct Surface Water Outside The Landfill • Transport The Masses From The Points Above To The Landfill And Lay Them Out In A Designated Place At The Landfill • Stabilize The Masses At The Landfill With The Help Of Gravel Masses And Topsoil. Growing Soil Must Provide A Basis For Later Acquisition For Planting And Seeding. • Establish Layer Fences It Is Also Relevant To Assess Whether There Is A Need For Further Measures In The Upper Part Of The Landfill. If Applicable, This Will Be Carried Out With Hourly Rates In The Contract. The Measures Must Also Take Into Account: • Outdoor Life • Cultural Heritage • Natural Environment The Norwegian Environment Agency Is The Landowner Of The Landfill Area At Knaben, And Invites, In Collaboration With Kvinesdal Municipality, To A Competition For Securing And Covering The Sand Landfill At Knaben. The Norwegian Environment Agency Is The Client, And Kvinesdal Municipality Will Be Responsible For Local Follow-Up Of The Contract With The Presence Of A Project Manager. Project Planning Has Been Carried Out By Asplan Viak Together With Nibio, On Behalf Of The Norwegian Environment Agency In 2025. See The Attached Tender Documents For A Detailed Description Of The Assignment.

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