Orono Substation Expansion - Enviromental Assessment (1)

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i 2.2 Substation The new Potato Lake substation will be a fenced-in area of 96 feet by 146 feet on a 3.2 acre parcel located in section 21 of Arago Township, along U.S. Highway 71. Itasca-Mantrap has purchased 3.2 acres of the land and will own all common facilities (land, fence, etc.) (See Figure 1). 1 2.3 Structures & Conductors The Permittee will use single-pole, direct-embedded wood structures,or similar. The poles average 65i to 80 feet in height with spans of 300 to 400 feet •,tween poles. Horizontal post insulators will be used unless design requires longer span ,-yo -• the capability of the ' insulators, in which case a braced post design will be uti gid"• acc• modate the increased loadings. Single-pole with underbuild design will be used in areas where the new transmission line will ' utilize the existing right-of-way of Itasca-Mantrap distrition ion lines along U.S. Highway 71 and 230th Street(Northern Pine Road)and i eluding new 12.5 kV distribution lines on the new 115 kV structures that follow along 230th Str � o rn Pine Ro ) and 141st Avenue up to the ' intersection with County Highway t$ Wh e thestructures are tacked"with a 115kV above a 12.5 kV the higher total voltage wil x • soles heights F • 85 feet with span length of 250 to 300 feet. > The Applicant will devel stra 4, es in an Avian ti,_Aon P fix' that will be implemented to avoid or minimize i to bin,�. or their habitats ae o River crossing and other public ' waters along the rH,te,pu 'uanTt5Section 5. of this Permit. The Avian Mitigation Plan will be submitted to th• o issi with the PI, ,d Profile for the Project. The threehases th p SkV transmi on 1m9 ill each consist of one single 26/7 kcmil 477 steel-reinforced alu °"um conductor ' One shield wire will be strung above the conductors to prevent damage from lightning strikes. These shield wires are typically less than one inch in diameter and include fiber optic cables, which allow a path for substation protection equipment to communicate with equipment at other terminals on the transmission line. 1 1 November 2010 Page 5