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3. The time of concentration for each area remains the same for the existing and <br />proposed calculations even though the areas and curve numbers are different. <br />This should be reviewed and corrected. <br />4. A curve number of 100 should be used for the area covered by the normal water <br />level of the proposed ponds in Subcatchment Dev -East and Dev -West. <br />5. Documentation should be provided to verify that the data in the HydroCAD <br />model is correct for the existing wetland, including area and outlet information. <br />In addition, the starting elevation for the wetland should match the outlet <br />elevation. <br />6. Documentation should be provided for the area of Subcatchment Adj -Area. <br />7. The maximum allowable impervious area by City Ordinance is 30 %. The curve <br />number for Subcatchment Dev -North should be revised to reflect a 30% <br />impervious area. <br />8. Dead storage calculations should be provided for review to verify that the <br />required volume is provided for treatment. <br />9. A drainage area map should be provided that corresponds with the areas for each <br />proposed catch basin to facilitate review of the storm sewer design. <br />Miscellaneous <br />1. The pavement section indicated in the geotechnical report is noted as a 10 -year <br />design life. It is required that a 20 -year design life be used. The report and street <br />section should be revised to reflect this. <br />Adopted this _ day of , 2005. <br />Attest: <br />Joel R. Hanson, City Administrator <br />By: <br />William Blesener, Mayor <br />7 <br />