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Name: Corrin Wendell <br />Date: January 17, 2022 <br />Page: 4 <br /> <br />H:\LTCANADA_CI_MN\0N1123140\2_Preliminary\C_Reports\Preliminary-Final Plat Review 2\Engineering Staff Review 2.docx <br /> <br />5. Given the characteristics within the wetland (shallow sewer, poor soils, water present, pipe <br />designed at minimum allowable grade), there are certainly long-term risks of settlement, floating, <br />freezing, water infiltration, and poor installation. The sewer design through the wetland should be <br />modified to address these considerations. Possible design alternative could include: <br />a Use of 401-Lined 8” DIP with tied joints <br />b Helical piles to support structure(s) and pipe(s) within the area of concern <br />c Waterproofing of manholes and their connections, rings, and castings <br />d Addition of more fill to provide additional pipe cover <br /> <br />Sincerely, <br />Bolton & Menk, Inc. <br /> <br /> <br />Eric Seaburg, PE <br />City Engineer <br /> <br /> <br />Cc: Chris Heineman, City Administrator <br />Bill Dircks, Public Works Director <br />