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<br />I <br />, II <br />II <br />II <br />ill <br />i II <br />II <br />II <br />II <br />II <br />II <br />I <br />II <br />I <br />II <br />I <br />I <br />II <br />II <br /> <br />For preliminary design, levee side slopes of 3 (horizontal) to 1 (vertical) arc <br />recommended, with a 10 foot wide minimum top width. The water table was identified <br />as being less than 2 feet from the surface. so considerations sball be taken in the grading <br />plans to minimize dewatering. Levee design details should be finalized based on detailed <br />feasibility-level geotechnical investigation. <br /> <br />CUL ruRAL RESOURCES <br />A preliminary search and review of existing site files, previous investigations, and <br />background literature was performed to identify known cultural resources within and in <br />the immediate vicinity of the study area. A pedestrian site visit was also conducted, and <br />the Minnesota State Historic Preservation Office (SHPO) has been notified that the <br />feasibility for this flood control project is being studied. These investigations revealed <br />one resource within the study area that is listed on the National Register of Historic <br />Places (NRHP) and also as a National Historic Landmark archeological site. This <br />resource is: <br /> <br />Pipestone National Monument <br />PP-SWE-AOI Pipestone National Monument Quarry (prehistoric) <br /> <br />If a feasibility study is warranted, the SHPO should be contacted when the <br />alternatives and impact areas are identified and again be asked for a formal, written <br />determination regarding the presence and significance of cultural resources in the area. <br />All cultural resources within the impact area should be systemically identified, evaluated, <br />and assessed regarding project impacts to ensure compliance with the National Historic <br />Preservation Act and the National Environmental Policy Act. <br /> <br />12 <br />