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Ms. Traci Tomas <br />August 9, 2017 <br />Page 2 <br /> <br /> S:\1Planning Commission\2017\08282017\MEMO - Development plan review - City Engineer.docx <br /> <br />2. Structural calculations for the proposed retaining walls greater than 4.0’ in height need to be <br />submitted for review prior to construction of the walls. The submittal will need to include: <br />a. Certification of a qualified MN licensed professional <br />b. Soil boring logs and geotechnical recommendation for support <br />c. Identify the type of material for the wall and design details <br />d. Provide details of the wall construction <br />e. Provide a safety railing or fence above the wall <br /> <br />3. The legend shows a floodplain boundary and a shoreland tier boundary. If those exist on the site, <br />identify their locations. <br /> <br />4. Buildings A and D appear to have adjacent sidewalk elevations higher than their FFE. Document <br />this need. <br /> <br />5. The slope south of Building B may require a retaining wall. <br /> <br />6. The northeast corner of Building A may require a retaining wall. <br /> <br />7. Label all steep slopes with minimums or maximums (i.e., 3:1 max). <br /> <br />8. Clarify the 919 contour between Pond 13P and Road B. <br /> <br /> <br />Storm Water Management <br /> <br />1. Label emergency overflow locations and elevations for all BMPs (aboveground and underground <br />systems). Add flow arrows as necessary. <br /> <br />2. According to the Mississippi Watershed Management Organization, any new or redevelopment <br />requires 2’ of freeboard over the 100-year HWL or 1’ over the EOF and lowest building floor <br />elevation. Basin 9P, Basin 10P, Pond 12P, and Pond 13P do not have a 2’ separation from the <br />100-year HWL. <br /> <br />3. The underground detention area near Stinson Parkway are not modeled. A design in HydroCAD <br />with labeled EOF and HWL is required to ensure it will not flood downstream structures. <br /> <br />4. Avoid short circuiting with Basin 10P if possible, or provide explanation as to why the inlet/outlet <br />configuration is necessary. <br /> <br />5. Provide detail on outlet control structures and pond sections. <br /> <br />6. Match HydroCAD values to plan set in final submittal. <br /> <br />7. Provide pretreatment structures and details for all permanent BMPs. <br /> <br />8. Submit drainage area map with the HydroCAD report for existing and proposed conditions. <br /> <br />9. Are drainage easements being added along Kenzie Terrace on the south side of Building D? <br /> <br />10. Provide storm sewer calculations in final submittal including cover, slopes, capacity, sizing, etc. <br /> <br />11. Add rip rap or other stabilization at pond inlets. <br /> <br />12. Pond 12P does not contain the HWL. <br /> <br />13. Will trench drains be located at each parking garage entrance? <br />206