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(b) Bankfull discharge rate of creek, stream, or river if there is a water course <br />�._ on the site or if the site discharges directly to the water course. <br />(c) Existing and Proposed hydrologic calculations for total runoff volume and <br />peak discharge rates by subwatershed for the 2 -year 24-hour frequency event, 10 -year <br />24-hour frequency event, and 100 -yr 24-hour frequency event or the 100 -year 10 -day <br />snowmelt. These shall include: <br />detention. <br />detention. <br />1. Assumed runoff curve numbers. <br />2. Time of concentration used in calculations. <br />3. Pre-existing total runoff volume and peak discharge rates. <br />4. Configuration of all drainage areas. <br />5. Total amount of new impervious surfaces created by the project. <br />6. Post -construction total runoff volume and peak discharge rates with no <br />7. Post -construction total runoff volume and peak discharge rates with <br />(d) Locations of all stormwater management practices, infiltration areas, and <br />areas not to be disturbed during construction. <br />(e) Location of all drain tiles on the project site shall be identified. <br />(f) Location and engineered designs for structural stormwater management <br />practices including stormwater treatment devices that remove oil and floatable material <br />(e.g., basin outlets with submerged inlets). <br />(g) Normal water level, high water level, and emergency overflow elevations <br />for the site and all ponding systems. <br />(h) Layout of proposed streets showing centerline gradients, section widths <br />and typical cross sections. <br />(i) Geotechnical analysis including soil borings at all proposed stormwater <br />management facility locations. <br />(j) Methods to be used for final stabilization of all exposed soil areas. <br />(k) Narrative addressing incorporation of infiltration BMPs. <br />