11-20-2006 Council Agenda - Laserfiche WebLink

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xiii. Bankfull discharge rate (1.5 year recurrence interval) of creek or stream if there is a waterway on the site or if the site discharges directly to the waterway. c. Proposed Conditions - A complete site plan and specifications, signed by the person who designed the plan shalt be drawn to an easily legible scale, shall be clearly labeled with a north arrow and a date of preparation, and shall include, at a minimum, the following information: i. Project map — An 8.5 by 11 inch United States Geological Survey (USGS) 7.5 minute quad or equivalent map indicating site boundaries, proposed elevations, and areas not to be disturbed; ii. Property lines and lot dimensions of plat. iii. The dimensions and setbacks of all buildings and easements. iv. The location and area of all proposed impervious surfaces including public and private roads, interior roads, driveways, parking lots, pedestrian ways, and rooftops. Show all traffic patterns and types of paving and surfacing materials. v. Location, size, and approximate grade of proposed public sewer and water mains. vi. Elevations, sections, profiles, and details as needed to describe all natural and artificial features of the project. vii. Identify all natural and artificial water features on site and within 1/2 mile of project boundary, including, but not limited to lakes, ponds, streams (including intermittent streams), and ditches. Show ordinary high water marks of all navigable waters, 100 -year flood elevations and delineated wetland boundaries, if any. If not available appropriate flood zone determination or wetland delineation, or both, may be required at the applicant's expense. viii. Hydrologic calculations for volume runoff, velocities, and peak flow rates by watershed, for the 2.0 -yr, 10 -yr, and 100 - yr 24 -hour storm events. These shall include: • Post construction peak flow rates with no detention. • Post construction peak flow rates with detention. • Assumed runoff curve numbers. • Time of concentration used in calculations. • If a flood insurance study has been done by the National Flood Insurance Program, the 100 -year flood elevation with and without the floodway. ix. Hydrologic calculations for retaining,)0% total suspended solids removal from the runoff generated by a NURP water quality storm (2.5" rainfall)., Model Stonnwater Ordinance Page 4 NEMO Ordinance Project 8 Deleted: soil particles greater than 5 microns Deleted: (80% reduction) for new construction sites and greater than 20 microns (40% reduction) for redevelopment sites resulting from a one- year 24 -hour storm event.