Agenda - Planning Commission - 06/06/2002

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NARI:Li, TIYE FOR BORROW PIT UTILIZATION i~! GREEN VALLEY ROAD Thc proposed borrow pit is located on the Eno Thomson farm at 62 10 Greta Valley, Road in )~noka CounW, City of Ramsev. Apprommare!y 200,000 cubic yards of' matenzd is expected to be mined 2om the pit. Since less than 5 acres w/Il be opened at a ~sme w-ir. hour r~tamation, an Erosion Control ?tan and a NnPDES Genera/Storm water P:,,xn/.t is not required for ti'ds proje~. Approximately 9 acres will be disturbed over the life of the operation. The following excavanon plan incorporates storm water run off control a~ well as an efficient method of excavatdon and pit rehabilitation. Toe work items are listed in the c~onoto~cal order they will oceur at the sire. MN DOT Heavy Duty silt fence w/ii be msralIed along the southern edge of the project sire berwe~-m the proposed borrow pit and the wetlands. After the silt fence is installed, clearing and g_rubbing will commence. 'Cae n-ees will be salvaged for fire wood as much a.s is practica/. The stumps and tree tops will be pushed toro piles and burned on sire-after the proper perrmt is secured. The haul road and 100 foot ~avei buff~ will be consn'ucted as indicated on the _2:fading plans. The gavel buffer will be refreshed as nezessm-y to ~7ummize ~zacking onto Green Valley Road. A security gate will be installed along the haul road co lirmr aczess dUPing non working hours. Proper sig. nage will be ~ecred along Green Valley Road during trucking operations. Lmfial topsoil stripping will be done along the South face of the h./.lI. The topsoil w/Il be pushed downidll to create a berm in front of the silt f~ce. Toe topsoil berm will be a rn.~imum of 4 fe~t high. The ~-a--ippmg acfiviLy will be conducted in such a way as to create a depressed area in front of the berm for water storao, qe. [r is antic/pared char all storm water will be mit/ally contained by the berm. The narur21 sandy soils will allow natural filtration and percolanon of the contained water. The berm will be seeded with rye ~ass or some other suitable cover ~op. Erosion control measures will be ma/ntamed until final cover is established. The res~ of the topsoil will be stripped to allow excavanon of the borrow material and w~II be stockpiled for restoranon. No topsoil be exported from the sire. Borrow excavation is 'scheduled tO be~.n along [he hill's Northeast edge and prbceed to the Ea~r and South. A backhoe will most likely be utilized to load the tracks:' The mareria/w/Il be excavated full depth and completely removed fi.om an area. No more than 5 acres will be exposed ar a t/me wit_hour reclamation. Ail disturbed area (including the haul road), will be reclaimed. For insmnca, ifha/f of pit area is disturbed to provide mate,rial for a particular projec~ ~at material will be removed and then that portion of the borrow .pit will be r~lamaed before excavation continues. Reclamar/on of the borrow pit will include ~ading the sub~m'ade to six inches below the contours shown on the ~ading plan and then spreading the av-a/lable topsoil over the disturbed are~. Toe stte will then be seeded with a cover crop. A£rer establishment of the cover crop, the silt fence and any silt trapped beiund the fence will be removed.