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• • Mr. Jason Wedel November 5, 2013 Page 2 3. Easements must be provided covering proposed on -site stormwater management facilities and should cover a horizontal area at least ten feet beyond the 100 -year high water elevation. GRADING PLAN 4. Building elevations must be revised to conform to freeboard requirements outlined in City Code. Requirements include the following. See City Code for more information: • At least two feet of freeboard must be provided from 100 -year high water elevations to low floor elevations, and • at least four feet of separation must be provided from highest monitored groundwater elevations to low floor elevations, and • at least one foot of separation must be provided between low building opening elevations and emergency overflow elevations. 5. Floodplain elevations must be noted on plans and if fill is proposed within the floodplain, an exhibit showing cut / fill volumes within the floodplain must be provided by the applicant to demonstrate no impacts to the floodplain. 6. The high water elevations on grading plan for Pond 1 must match results shown in HydroCAD Report (896.4 instead of 896.0). 7. Label high water elevation of Pond 2 and verify that high water elevations from south wetland do not flow into Pond 2 or modify HydroCAD report to account for this flow. 8. Emergency overflow locations and elevations must be clearly denoted on plan. 9. Benchmark or datum should be provided on grading plan. UTILITY PLAN 10. Storm sewer design calculations must be provided for review and approval prior to final plat approval. Profile drawings of public utilities will also be needed with this submittal. 11. City detail plates must be incorporated into the plan set. STORMWATER MANAGEMENT 12. The applicant must quantify and address water quality requirements of RCWD Rules in Stormwater Management narrative. 13. Design must be revised so that proposed peak discharge rates do not exceed existing peak rates for the 2, 10, and 100 -year, 24 -hour events and for the 100 -year, 10 -day snowmelt. 14. Permits for wetland impacts and replacement plan must be approved by RCWD. K O2o29-63owdmm\Doo,\MEMOj_wcdel stormwater comments t t 0513.doox