Orono Substation Expansion - Enviromental Assessment (1)

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New structures will be designed to support the existing transmission and distribution lines,thereby allowing the use of existing alignments and will share existing road rights- of-way to the extent that such actions do not violate sound engineering principles or system reliability criteria. ' Structures will be placed at the maximum feasible distance, consistent withsound engineering principles and system reliability criteria, from intersecting roads, highway,or trail crossings and could cross roads to minimize or avoid impacts. The Permittee shall work with landowners to identify and address issues related to the transmission line such as distance from existing structures,tree clearing, and other aesthetic concerns. i4.2.7 Erosion Control The Permittee shall follow standard erosion control measures outlined in Minnesota Pollution Control Agency (MPCA) guidance and best management practices regarding sediment control practice during constructs•,+ includerotecting storm drain inlets,use of silt fences,protecting exposed soil, imm-• stabing restored soil, controlling temporary soil stockpiles, and control or g is _ , ting. The Permittee shall implement rea ona• measures to m'nimize runoff during construction and shall prom tly plant or seed, erect silt ces, and/or use erosion control blankets in non-agricultura eas h were disturb-• wh e structures are installed. When utilizing seed to establish temporary and permanent "'.etative cover on exposed soil,the Permitte- ill consult with the Minnesota Dep ment of Transportation (Mn/DOT)and M nesota Department of Natural Resources(MnDNR)to select site characteristi e ified to be free Mnoxious weeds. Conto w' be grled as req _ • se' a surfaces drain naturally, blend with the natural retffm, are left in aondstio hat will facilitate re-vegetation,provide for proper drains , and prevent ero •n areas disturbed during construction of the facilities will be returned to their p - onstruction condition. Larger disturbed areas of one acre or more (substation site)will be regulated by a National Pollutant Discharge Elimination System (NPDES)permit and Stormwater Pollution Prevention Plan prepared for the project. 4.2.8 Wetlands and Water Resources ' Structures shall be located to span watercourses, wetlands, and floodplains to the extent practicable and consistent with sound engineering principles. Minimal grading of areas around pole locations may be required to accommodate construction vehicles and equipment. I November 2010 Page 111 1