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Request for Permit- Floodplain Development Application Y-81 Kegonsa-Sun Prairie Rerate Project Page 5 Dane County,Wisconsin 5. Existing structures will be removed by either pulling the poles from the ground or by cutting the poles off just below the ground. Holes left by removed poles will be backfilled with excess spoils generated by the drilling of the hole for the new pole, or with clean granular fill and/or topsoil. Best Management Practices (BMPs), such as perimeter control devices, will be installed prior to structure installation activities to prevent soil erosion and sediment loss to the extent practicable. Environmental monitors will inspect the structure installation locations during construction and assess the need for additional BMPs. Temporary spoil storage will be located in upland areas near the work areas until the spoils are used as backfill for the installation. In addition, temporary construction matting may be utilized for access if unstable ground conditions are present. 2.2.2 Structure Reframing Structures 386 and 399 — 401 will be reframed. Reframe activities are minimally invasive and will consist of raising the arms and hardware of a particular structure to achieve a minimum height differential between the wires and the distribution underbuilds, buildings, or ground below. Structure reframing typically requires one-time access with a single bucket truck and lineman crew. Contractors also, where feasible, have the option to allow crews to walk to structures on-foot and climb poles to perform necessary maintenance. Ground disturbance associated with accessing the structures is anticipated to be negligible, and all reframe activities occurring on the poles will be located above flood elevation. Temporary construction matting may be utilized for access if unstable ground conditions are present. 2.2.3 Project Access/ Equipment Travel Access to structure reframe and replacement activities will cross regulated floodplain and floodway. The Project will be accessed using the existing ROW and adjacent public roads, and in some cases, off-ROW access routes will be utilized to safely and efficiently access the structure locations. Where off-ROW access is needed, ATC will facilitate correspondence with the landowner in an effort to minimize impacts to the property and natural resources to the extent practicable. Vehicle traffic on the access paths will be intermittent and dependent on the type of construction activities being conducted. The existing vegetation will be preserved to the maximum extent practicable. Construction vehicles may include auguring equipment, heavily loaded trucks, and cranes. Should conditions along the access routes cause or threaten to cause ground disturbance, an environmental monitor will be on-site to inspect the placement of temporary construction matting and/or proper BMPs to limit soil erosion off-site. Public thoroughfares will be maintained free of mud-tracking during construction. 2.3 Soil Erosion & Sediment Control Construction will be accomplished in such a manner as to minimize erosion and siltation. Erosion control BMPs will meet or exceed the standards in the Wisconsin Department of Natural Resources (WDNR) Conservation Practice Standards. Necessary BMPs will be installed prior to any ground disturbing activities and will be properly maintained throughout the Project. These methods will vary depending upon site grade, site conditions, and time of disturbance. The exposure of bare ground will be restricted to the minimum amount necessary for construction. • gai consultants D160245.00/March 30, 2017