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Request for Permit- Floodplain Development Application <br /> Y-81 Kegonsa-Sun Prairie Rerate Project <br /> Dane County,Wisconsin Page 4 <br /> Table 1: Floodplain& Floodway Activities <br /> Structure Activity' Floodplain Flood Structure Floodplain/Floodway <br /> or Elevation2 Elevation Impact <br /> Floodway (ft) (ft) <br /> 386 Structure Reframe Floodway 903.7 902.35 No net impact; reframe activities <br /> located above flood elevation. <br /> 399 Structure Reframe Floodplain 907 906.6 No net impact; reframe activities <br /> located above flood elevation. <br /> 400 Structure Reframe Floodway 907 907.76 No net impact; reframe activities <br /> located above flood elevation. <br /> 401 Structure Reframe Floodplain 907 906.47 No net impact; reframe activities <br /> located above flood elevation. <br /> 446 Structure Replacement Floodway 920 916.81 No net impact; poles being <br /> replaced pole-for-pole. <br /> 447 Structure Replacement Floodway 920 916.9 No net impact; poles being <br /> replaced pole-for-pole. <br /> 448 Structure Replacement Floodway 920 916.68 No net impact; poles being <br /> replaced pole-for-pole. <br /> 449 Structure Replacement Floodway 920 917.27 No net impact; poles being <br /> replaced pole-for-pole. <br /> 'Each activity includes temporary access; temporary construction matting will be used as necessary. <br /> 2Flood elevations derived from mapped cross section and base flood elevations depicted on FEMA FIRM figures. <br /> 2.2.1 Structure Replacement <br /> Structures 446 — 449 will be replaced, with each new structure being located approximately 10 <br /> feet north of the existing structure. Each structure replacement may utilize a 20-foot by 20- <br /> foot workspace which may be temporarily disturbed as a result of equipment movement and <br /> excavation of the structure installation borehole. The procedure for replacement of a structure <br /> will be as follows: <br /> 1. Structure sites will be prepped by drilling a hole to a depth of approximately <br /> 20 feet and a width of approximately 4 feet. The structures will be installed <br /> inside metal culverts, which is standard practice for structures located in <br /> wetlands or floodplains. <br /> 2. Insulators and associated structure hardware will be installed on the pole <br /> when the pole is on the ground (framing.) <br /> 3. After framing, the pole is lifted in place with a crane and set in the hole. If the <br /> soil conditions require, temporary split barrels or other methods are used to <br /> brace the hole until the pole is in place. It is common practice to use a bucket <br /> truck to lift workers and any required hardware (insulator strings, pulling <br /> dollies, etc.) to their locations on the structure to allow the work to be <br /> accomplished safely and efficiently. <br /> 4. After the structures have been erected, the hole is backfilled with the <br /> excavated material or clean granular fill. Any excess material will be properly <br /> disposed of in an upland area either on or off-site, as required. The excavated <br /> material resulting from drilling of the new hole will be properly disposed of in <br /> the hole left by the removal of the original structure and in an upland area <br /> either on-site or off-site, as required. <br /> • gai consultants <br /> D160245.00/March 30, 2017 <br />