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Stormwater management plan required exhibits . The stormwater management plan shall be prepared and signed by a duly licensed engineer in the State of Minnesota . The following exhibits must accompany the permit application : two plan sets , full size ( 22 inches by 34 inches ) ; and one electronic cop in a . pdf ^ no nI � n � o + , format . All plan sets shall also be submitted electronically in a . dwg format or as otherwise determined by the City Engineer . Tho minims arm i �fnrnma ' n r� rvi iiromnn + c of +� ( a ) A grading , erosion and sediment control plan and , for projects that require a NPDES permit , a stormwater pollution prevention plan ( SWPPP ) i � riQn iirorl ( b ) Stormwater management plan including existing and proposed hydrologic calculations for total runoff volume and peak discharge rates as described in this chapter , including : 1 . A narrative including a project description , discussion of BMP selection , incorporation of infiltration BMPs , and revegetation plan for the project site ; 2 . Delineation of all drainage areas , including contributing runoff from off- site areas , proposed and existing subwatersheds on - site , emergency overflows , and drainage ways ; 3 . Existing , proposed , and total amount of impervious surfaces created by the project ; 4 . Existing and proposed runoff curve numbers ; 5 . Time of concentration used in calculations ; and 6 . Existing and proposed total runoff volume and peak discharge rates for the two - , ten - , and 100 - year critical events utilizing NOAA Atlas 14 . ( c ) Property of lines and delineation of lands under ownership of the applicant . ( d ) Locations of all stormwater management practices , infiltration areas , and areas not to be disturbed during construction . ( e ) Location of all drain tiles on the project site shall be identified . ( f) Location and engineered designs for structural stormwater management practices including stormwater treatment devices that remove oil and floatable material ( e . g . , basin outlets with submerged inlets ) . ( g ) Normal water level , high water level , and emergency overflow elevations for the site and all ponding systems related to NAVD88 . ( h ) Identification of existing and proposed one - foot contour elevations within the project site related to NAVD88 . ( 1 ) Geotechnical analysis including soil borings at all proposed stormwater management facility locations ASTM D5921 and D2488 . 28