Laserfiche WebLink
KNIFE RIVER <br />AN MDU RESOURCES COMPANY <br />Description of Pro i ect Narrative <br />■ Detailed description /scope of project. <br />■ What is being proposed? <br />Knife River is requesting to extend our existing asphalt plant and <br />hauling operations CUP for an additional 15 years. <br />The proposed project will consist of all equipment necessary to <br />operate an asphalt plant. This will consist generally of a HMA <br />drum for heating and drying aggregate and mixing aggregate with <br />asphalt cement (AC), storage tanks for fuels, AC and HMA, <br />aggregate operations, recycled asphalt operations and aggregate <br />and recycle stockpiles. <br />The HMA production site will be located on an existing gravel <br />mining site. That site is active and has a current, valid conditional <br />use permit. Aggregate for the production of HMA at the proposed <br />HMA plant will come from both the on -site gravel operation and <br />off -site sources, in order to meet current asphalt specifications. <br />As stated above a HMA production site includes the storage and <br />processing of aggregate material and AC. Aggregate is combined <br />with AC to produce asphalt. <br />Currently, the HAM plant is portable. It is a piece of equipment that <br />enters and leaves the site on wheels. At this time, there will not be <br />any permanent structures constructed. <br />Portable temporary storage tanks are placed at the time of <br />operations that contain diesel fuel for trucks and engines, fuel for <br />the HMA plant burner (used oil and type 6 fuel oil) and A. C. Tanks <br />meet MPCA requirements. The tanks will be either double walled or <br />bermed with landfill liners below them. <br />Existing bituminous asphalt removed from a road as part of a <br />paving project and new shingle scraps from manufacturing are <br />recycled. All recycled bituminous asphalt associated with a <br />particular paving project is stored and processed on site as part of <br />hot mix asphalt production. The recycling operation includes a <br />conveyor, hopper, loader, grinder and the asphalt plant. Recycled <br />bituminous asphalt can also be used as road base if there is more <br />than can be used by a particular project. <br />3 <br />