A. The development shall conform to the natural limitations presented by topography and soil so as to create the least potential for soil erosion.
B. Erosion and sediment control measures shall be consistent with best management practices (BMPs) for erosion and sedimentation control as specified in the "Minnesota Stormwater Manual" (MPCA 2005), as amended, and shall be sufficient to retain sediment on site.
C. Erosion and sediment controls shall meet the standards for the general permit authorization to discharge stormwater associated with construction activity under the national pollutant discharge elimination system/state disposal system permit program permit MN R100001 (NPDES general construction permit) issued by the Minnesota pollution control agency, as amended. Final stabilization of the site must be completed in accordance with the NPDES construction permit requirements.
D. Land shall be developed in increments of workable size such that adequate erosion and siltation controls can be provided as construction progresses. The smallest practical area of land shall be exposed at any one period of time. When soil is exposed, the exposure shall be for the shortest feasible period of time, as specified in the development agreement.
E. Where the topsoil is removed, sufficient topsoil shall be set aside for respreading over the developed area. Topsoil shall be restored or provided to a minimum depth of six inches (6") and shall be of a quality at least equal to the soil quality prior to development.
F. Natural vegetation shall be protected wherever practical.
G. Runoff water shall be diverted to a sedimentation basin before being allowed to enter the natural drainage system. All on site stormwater conveyance channels shall be designed and constructed to withstand the expected velocity of flow from a 10-year frequency storm without erosion.
H. All temporary erosion and sediment controls shall be installed on all down gradient perimeters before commencing the land disturbing activity and left in place and maintained until the site has been stabilized. All permanent erosion control measures shall be installed and operational per the design and as required by the city.
I. If the activity creates more than one acre of disturbed area, and the activity is taking place on a site where soils are currently disturbed (e.g., a tilled agricultural site that is being developed), areas that will not be graded as part of the development and areas that will not be stabilized according to the time frames specified in the NPDES general construction permit part IV.B.S. shall be seeded with a temporary or permanent cover before commencing the proposed land disturbing activity. (Ord. 847, sec. 2, 11-17-2008)