Agenda - Council - 03/25/1997 - Laserfiche WebLink

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NARRATIVE FOR BORROW PIT UTILIZATION ~ GREEN VALLEY ROAD The proposed borrow pit is located on the Eric Thomsen farm at 6210 Green Valley Road in Anoka County, City of Ramsey. Approximately 200,000 cubic yards of material is expected to be mined from the pit. Since less than 5 acres ;vill be opened at a time without reclamation, an Erosion Control Plan and a N?DES General Storm water Permit is not required for this project. Approximately 9 acres will be disturbed over the life of the operation. The following excavation plan incorporates storm water run off control as well as an efficient method of excavation and pit rehabilitation. The work items are listed in the chronological order they will occur at the site. MN DOT Heavy Duty silt fence will be installed along the southern edge of the project site between the proposed borrow pit and the wetlands. After the silt fence is installed, clearing and grubbing will commence. The trees wilI be salvaged for fire wood as much as is practical. The stumps and tree tops will be pushed into piles and burned on site after the proper permit is secured. The haul road and 100 foot gravel buffer will be constructed as indicated on the grading plans. The gravel buffer will be refreshed as necessary to minimize tracking onto Green Valley Road. A security gate will be installed along the haul road to lhnit access during non working hours. Proper signage wilt be erected along Green Valley Road during tracking operations. Initial topsoil stripping will be done along the South face of the hill. The topsoil will be pushed downhill to create a berm in front of the silt fence. The topsoil berm will be a minimum of 4 feet high. The sthpping activity will be conducted in such a way as to create a depressed area in front of the berm for water storage. It is anticipated that all storm water will be initially contained by the berm. The natural sandy soils will allow natural filtration and percolation of the contained water. The berm will be seeded with rye grass or some other suitable cover crop. Erosion control measures wilI be maintained until final cover is established. The rest of the topsoil will be stripped to allow excavation of the borrow material and will be stockpiled for restoration. No topsoil will be exported from the site. Borrow excavation is scheduled to begin along the hill's Northeast edge and proceed to the East and South. A backhoe will most likely be utilized to load the trucks. The material will be excavated full depth and completely removed from an area. No more than 5 acres will be exposed at a time without reclamation. All disturbed ardas (including the haul road), will be reclaimed. For instance, if half of pit area is disturbed to provide material for a particular project, that material will be removed and then that portion of the borrow pit will be reclaimed before excavation continues. Reclamation of the borrow pit will include grading the subgrade to six inches below the contours shown on the grading plan and then spreading the available topsoil over the disturbed areas. The site will then be seeded with a cover crop. After establishment of the cover crop, the silt fence and any silt trapped behind the fence will be removed. I I I I I I I I I I I I I I I I I I I