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Ms. Katie Larsen <br />December 26, 2013 <br />Page 3 <br />11. Sanitary sewer manhole No. 6 includes an interior drop of 6.45 feet. The maximum drop <br />allowed is 18 -inches. The grade on the sanitary pipe from manhole No. 13 to manhole <br />No. 6 needs to be adjusted accordingly. <br />12. The minimum storm sewer pipe size is 15 -inches in diameter. <br />13. All storm sewer must be RCP. <br />14. Storm sewer design calculations must be provided for review and approval prior to final <br />plat approval. Profile drawings of public utilities will also be needed with this submittal. <br />15. City detail plates must be incorporated into the plan set. <br />STORMWATER MANAGEMENT <br />1. The applicant must present required and proposed pond volumes in the Stormwater <br />Management narrative. Based on HydroCAD Report, it appears that all ponds are able to <br />meet the criteria. <br />2. Provide calculations for 10 -day snowmelt and demonstrate compliance with rate control <br />for this design event. <br />3. Permits for wetland impacts and replacement plan must be approved by RCWD. <br />4. Note elevation of floodplain on plans or in narrative. If the site's elevations are not <br />within regulated floodplain elevations, this should be noted in narrative. If fill is <br />proposed within floodplain areas, provide cut / fill volumes within the floodplain to <br />demonstrate that no net fill will occur within the floodplain. <br />5. Note that ATLAS 14 precipitation was used for analysis in Stormwater Management <br />Report narrative for future reference. <br />6. Curve Numbers used in the HydroCAD model should match standards outlined in <br />RCWD Rules. <br />7. Address how runoff from proposed Old Birch Street (Subcatchment 1) to the intersection <br />of existing Old Birch Street will be addressed. <br />8. Address wetland impacts and provide drainage design (e.g. culvert and EOF) for the <br />proposed trail that crosses Wetland F-3. <br />3 <br />