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Review File: Brookfield 8th Addition <br />Final Plat Exhibits <br />Engineering Review <br />February 7, 2017 <br />Page 5 of 5 <br />The table in the report neglected backyard runoff from Area 2 to Trott Brook. The live storage <br />volume of the pond must be increased and the outlet size decreased to retain more water on <br />site to account for the back roof runoff that is not routed to the pond. The Net Change in <br />Runoff line must be 0 or negative. <br />The LRRWMO requires volume reduction (infiltration) on all projects. The report states onsite <br />soils in the mitigation area will be removed and replaced with more permeable soils to promote <br />infiltration. Details for the soil replacement must be included in the plans. The Minnesota <br />Pollution Control Agency has produced the free MIDS calculator for evaluating stormwater <br />practices like infiltration. The pond and infiltration basin should be evaluated with the MIDS <br />calculator. The bottom of the infiltration basin must be lower than the elevation of the weir <br />from the pond so that the volume to be infiltrated is retained in the infiltration basin. <br />The summaries for the 1" rainfall must be added to the Hydrocad report. <br />Pipe sizing calculations for the 10-year storm have been provided and are approved. <br />A project manual which includes the bid form, contract and specifications must be submitted <br />with the final plat. <br />Revised plans which address all of these changes must be submitted. <br />