Agenda - Parks and Recreation Commission - 03/09/2017

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Review File: Covenant Meadows Preliminary Plat Exhibits Engineering Review February 22, 2017 Page 3 of 3 1. Trees to be removed must be clearly identified on the plan and in the tables. Add a column to the tables identifying trees to be removed. 2. Tree protection fencing must be shown on the plan and installed as noted above. Detail Sheets: 1. Detail sheets must be added to the plan set. Stormwater Calculations A stormwater summary report was provided. The report states the 100 year storm is retained in the pond. The LRRWMO rules require sizing the basins for back to back 100 year storms if there is no outlet. The ponds will need to be enlarged. The LRRWMO requires volume reduction (infiltration) on all projects. The LRRWMO rules require that infiltration basins empty completely within 48 hours after a 1"rainfall. The report must be revised to include the 1 inch, 2 year, 10 year, 100 year and 100 year back to back rain events. The HydroCAD report needs the Project Name and the Company Name on the page headers. These reports become part of the City's permanent stormwater records. The report states onsite soils in the mitigation area will be removed and replaced with more permeable soils to promote infiltration. Details for the soil replacement must be included in the plans. The Minnesota Pollution Control Agency has produced the free MIDS calculator for evaluating stormwater practices like infiltration. The pond and infiltration basin must be evaluated with the MIDS calculator. The stormwater report must include the infiltration summary for each pond. Draft boring logs were included with the stormwater report. A location map for the borings was not included. A project manual which includes the bid form, contract and specifications must be submitted with the final plat. Revised plans which address all of these changes must be submitted.