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Historic Properties (Section 106) '1 Mn/DOT will carry out the commitments stipulated in the Section I06 Memorandum of Agreement for the Pine River Depot, Pequot Lakes Lookout Tower, and the Brainerd and Northern Minnesota Railway corridor. Contaminated Properties During the final design process, properties to be. acquired will be investigated further for potential contaminated materials and to determine the extent and magnitude of contaminated soil or groundwater in the areas of concern. Evidence of contamination will be reported to MPCA and the current property owner. In addition, coordination and consultation with the MPCA VIC Unit, the Voluntary Petroleum Investigation and Cleanup Unit, the Petroleum Remediation Unit, and the Minnesota Department of Agriculture Voluntary Cleanup/Technical Assistance Program will take place as appropriate, to, obtain assurances that contaminated site cleanup work, and/or contaminated site acquisition, will not result in long -term environmental liability for the contamination, and to obtain contaminated soil - and/or groundwater handling and cleanup plan approval. Excess Materials The construction contractor(s) will adhere to state and local regulations and special provisions to ensure protection of wetlands and waterways in disposing unusable excavated material. Surface Water Management and Water Quality A detailed storm water pollution prevention plan (S WPPP) will be developed during the final design phase. This plan will be completed in accordance with the National Pollutant Discharge Elimination System ( NPDES) Phase II permit requirements. Short-term and long -term best . management practices will likely include: grassed swales with berms, wet swales, vegetated filter strips, rock ditch checks, rapid revegetation of exposed areas, infiltration basins, detention ponds, and curb and catch basins in urban design segments. These mitigation strategies will be used to provide water quality treatment of storm water runoff before it is discharged into receiving water bodies. Furthermore, construction in or near waterways and wetlands will be undertaken in accordance with Mn/DOT's Standard Specifications for Road and Bridge Construction and other special provisions identified in the SWPPP and NPDES Phase II permit to minimize erosion and sedimentation. Floodplains The reconstruction of TH 371 North over Cullen Brook, Hay Creek, the unnamed flowage south of downtown Jenkins, the unnamed flowage north of downtown Jenkins, the Pine River; and Norway Brook will be designed to accommodate the 100 -year flood stage by ensuring an acceptable clearance of road structures above the calculated 100 -year flood elevation. Additional design features such as steeper side slopes and guardrail will be considered to minimize impacts to the above mentioned floodplains. Wetlands Wetland impacts will continue to be avoided or minimized through the final design phase to the extent possible, as mandated by both federal and state law. Compensatory replacement of wetland impacts will comply with federal guidelines under Section 404 of the Clean Water Act, as well as the replacement criteria described under the rules of the Minnesota Wetland Conservation Act. TH371 Adequacy Determination Nisswa to Pine River 10 October 2010