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Review File: Estates o f Silver Oaks 2"d Addition <br />Preliminaw Plat <br />Engineering Review <br />Mav 23, 2017 <br />Page 2 of 2 <br />7. Add sawcut lines for removing existing pavement. Identify quantity of bituminous to <br />remove. <br />8. Specify joint type for connecting to existing pavement, reference detail STR-25 and add it <br />to plan set. <br />Gl: The title must be changed to include Erosion Control <br />1. City Code requires that existing topography be shown for 100 feet beyond the boundary of <br />the plat. Topography is shown; however, it does not extend the required 100 feet. <br />2. The minimum grade on all lots in all directions shall be 2.0% or greater. <br />3. Turn off all of the tree symbols on this page that are shown to be removed on sheet T1 <br />4. Add tree protection fence to show limits of clearing. <br />5. Provide horizontal separation between pond inlet and outlet. <br />6. The notes refer to a different project and must be updated. <br />7. Show proposed elevations at all lot corners. <br />8. Silt fence must be added along the front lot lines. <br />9. The base map area must be expanded to show the existing catch basins on 162"d lane. Inlet <br />protection devices must be installed in the nearest existing catch basins because Lot 1, <br />Block 1 and Lots 1 and 2, Block 2 drain onto existing paved streets. <br />Stormwater Calculations <br />1. The stormwater summary indicates the basin in Block 3 provides adequate infiltration <br />volume for the impervious areas on this site. <br />2. The stormwater summary must state the total impervious area created, the infiltration <br />volume required, the depth of the infiltration basin and the time for the basin to empty. The <br />infiltration volume calculation must be shown, it can be from a formula or from the MIDS <br />Calculator. The 1 inch rainfall from HYDROCAD is not an acceptable method. <br />3. The infiltration area and the stormwater detention area are the same. The detention area <br />must be totally dry 48 hours after the 100 year event. If this cannot be achieved then the <br />infiltration and detention areas must be separated. <br />4. The summary table of runoff rates must be expanded to list the existing and proposed rates <br />for each subcatchment. The summary must address potential impacts to the adjacent <br />properties from increased runoff leaving the site. <br />Soil boring locations are shown on the plans. A geotechnical report must be submitted for this <br />project. <br />