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Request for Permit- Floodplain Development Application Y-81 Kegonsa-Sun Prairie Rerate Project Page 6 Dane County,Wisconsin I Standard erosion control and/or restoration practices, namely seeding and mulching, following the above-mentioned schedule may not be sufficient to meet soil loss requirements for disturbed areas with slopes greater than 3 percent with slope lengths over 50 feet. I n areas that meet this Universal Soil Loss Equation (USLE) threshold that will also be experiencing disturbance due to utility construction activities, professional judgement will be used to determine which additional WDNR- approved erosion and sediment control BMPs will be implemented to reduce the erosion potential or to determine if earlier restoration at specific locations may be appropriate to meet the USLE soil loss requirements. The planned perimeter control devices such as silt fence, erosion eels, sediment stop logs, etc. to reduce sediment migration off-site are identified on Figure 2. Additional BMPs may consist of installing one or more of the following: • Slope breakers to reduce the effect of slope and slope length and aid in sediment removal • Erosion mat to stabilize disturbed soil or prevent erosion on slopes or channels • Ditch checks, existing culvert inlet protection, and tracking provisions at the road entrance/exit points to reduce sediment migration via roadside ditches and aid in sediment removal The Project will have limited impact to roadside ditches, culvert crossings and swales. However, ditch checks, channel erosion mat and culvert inlet protection may be utilized if construction occurs near or in areas of concentrated flow. Provisions to prevent delivery of sediment off-site via ditches, culverts, or channels will be implemented as necessary. Where applicable, tracking controls will be installed to prevent soil from being tracked into public thoroughfares. Construction materials, waste generated by construction activities, and debris will be managed so as to prevent their entrance into storm sewers or waters of the state. Designated recycling and garbage dumpsters will be made available for the appropriate separation and disposal of all refuse materials. ATC's standard erosion control plan is included as Attachment 4. 2.4 Restoration 2.4.1 Restoration In order to restore the ROW to its original condition, all construction waste and debris will be removed from the ROW and disposed of properly. Upon final clean-up, areas will be permanently restored as soon as possible depending on construction activities, weather and soil conditions. Seed and mulch or seed and erosion control matting may be placed in areas of bare soil. Upon final vegetation establishment, all temporary erosion control measures will be removed. Restoration in agricultural areas will be negotiated with the individual landowner depending on future use of the ROW. In most cases, agricultural landowners who had cropped fields typically return their land to agricultural production after construction is completed. If deemed necessary, decompaction of the agricultural fields may be performed. ATC will work with landowners to accomplish restoration. Once an agricultural landowner tills or, in any other way, disturbs the ground with agricultural practices, ATC is not responsible for the resulting disturbed soil. 2.5 Construction Inspection and Maintenance Erosion and sediment control BMP5 along the Project ROW will be inspected at least once every 7 calendar days and within 24 hours of a rainfall event producing precipitation of 0.5 inches or greater. If inspection findings indicate the need for repair or replacement of previously installed erosion control measures, maintenance will be completed and performed in accordance with WDNR-approved • gai consultants D160245.00/March 30, 2017