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City of Hugo August 17, 2018 Page 2 • Proposed and existing stormwater facilities' location, alignment and elevation. • Delineation of existing on-site wetland, marshes and floodplain areas. • Identification of existing and proposed normal, ordinary high and 100 -year water elevations on- site. • Identification of existing and proposed contour elevations within the project site related to NAVD 88. • Construction plans and specifications of all proposed stormwater management facilities, including design details for outlet control structures. • Grading plan showing floodplain elevations, EOF locations and elevations, building elevations, and grading limits. • Stormwater runoff volume and rate analyses for the 2-, 10 -,100 -year, and 10 -day snowmelt critical events, existing and proposed conditions utilizing NOAA Atlas 14. • All hydrologic, water quality and hydraulic computations completed to design the proposed stormwater management facilities. Atlas 14 rainfall depths and MSE 3 distribution curve method must be used. Runoff from pervious and impervious areas within the model must be modeled separately. Curve numbers for pervious areas shall be consistent with values recommended in the Minnesota Stormwater Manual. Curve numbers for post -development condition within construction limits shall be shifted down one classification for HSG B and half a classification for HSG A to account for impacts of grading on soil structure unless the project specifications incorporate soils amendments. Narrative including a project description, discussion of BMP selection, and revegetation plan for the project site. • Utility plan including storm sewer design and details plates. • Other project site-specific submittal requirements as may be required by the City. K:\010469-000\Admin\Docs\Stormwater Requirements Memo.docx