Agenda - Planning Commission - 07/06/2017

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Review File: Estates of Silver Oaks 2nd Addition Preliminary Plat Engineering Review June 26, 2017 Page 2 of 2 7. Add sawcut lines for removing existing pavement. Identify quantity of bituminous to remove. Move removals to the Removal Sheet. 8. Label the connection point to existing bituminous and provide a spot elevation. 9. Specify joint type for connecting to existing pavement, reference detail STR-25 and add it to plan set. 10. Label width of existing street. 11. Add station labels to plan view. 12. Check inverts using length and slope of pipes and update. 13. Add a site specific typical street section. 14. Storm sewer pipe sizing calculations must be submitted for the 10 year storm. 15. Provide profile view of proposed utility services to lot 5, showing cover over pipe. Gl : 1. City Code requires that existing topography be shown for 100 feet beyond the boundary of the plat. Topography is shown; however, it does not extend the required 100 feet. 2. The minimum grade on all lots in all directions shall be 2.0% or greater. 3. Turn off all of the tree symbols on this page that are shown to be removed on sheet T1 4. Add tree protection fence to show limits of clearing. 5. The notes refer to a different project and must be updated. 6. Show proposed elevations at all lot corners. 7. Silt fence must be added along the front lot lines. 8. The base map area must be expanded to show the existing catch basins on 162nd lane. Inlet protection devices must be installed in the nearest existing catch basins because Lot 1, Block 1 and Lots 1 and 2, Block 2 drain onto existing paved streets. Stormwater Calculations 1. The stormwater summary indicates the basin in Block 3 provides adequate infiltration volume for the impervious areas on this site. 2. The stormwater summary must state the total impervious area created, the infiltration volume required, the depth of the infiltration basin and the time for the basin to empty. The infiltration volume calculation must be shown, it can be from a formula or from the MIDS Calculator. The 1 inch rainfall from HYDROCAD is not an acceptable method. 3. The infiltration area and the stormwater detention area are the same. The detention area must be totally dry 48 hours after the 100 year event. If this cannot be achieved then the infiltration and detention areas must be separated. Calculations must be provided to support the statement on the summary sheet. 4. The summary table of runoff rates must be expanded to list the existing and proposed rates for each subcatchment. The summary must address potential impacts to the adjacent properties from increased runoff leaving the site.