Agenda - Parks and Recreation Commission - 11/09/2017

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10/31/2017 09:12 AM Utility Plan: Symbols in the legend must match the plan view. Specify the connection type and location to connect to existing. Profiles are not required for preliminary plat. Street Plan: Urban streets shall be 32 ft Back to back with concrete curb and gutter. Symbols in the legend must match the plan view. A site specific typical street section is required. Stormwater Calculations This project will require a permit from the Lower Rum River Watershed Management Organization (LRRWMO). The LRRWMO board will not consider the permit until the project has received preliminary plat approval. The LRRWMO application requires city acknowledgement. Work with staff to coordinate timing of the application submittal. The LRRWMO requirements are infiltration of the first 1" of runoff from new impervious surfaces, rate control for the 2, 10 and 100 year events and water quality improvement with removal of 60% total phosphorus and 90% total suspended solids. Infiltration basins must be designed to drain down within 48 hours. If the basin is joined with the stormwater pond, the infiltration basin area must be dry 48 hours after a 100 year storm. The removal efficiencies must be documented by submittal of an approved model such as P-8, MIDS Calculator or MPCA spreadsheet. The complete documentation must be submitted, not just the output summary tables. The City will administer the storm water management requirements of the permit. A 16.5 ft easement is required around all infiltration basins and stormwater ponds. Storm sewer pipe sizing calculations must be submitted for the 10 year storm. Casting information must match detail STO-4. 0 Replies 19 - Engineering Final Plat Created by: Len Linton On: 10/12/2017 09:01 AM The Final Plat submittal must include these items. Storm sewer shown on Santiary Sewer and Water Plans shall be in a lighter pen. The same is true for Storm Sewer and Street plans, with the Sanitary Sewer and Water in a lighter pen. Centerline grades will be required on all profile sheets (Sanitary Sewer and Water, Storm Sewer and Street) where the pipes are in the Right of Way. Centerline Stationing shall be shown on all profile sheets except Storm Sewer outside of ROW. Individual custom curb ramp details are required for each pedestrian ramp. The MNDOT 6 set sheet must be included on the detail sheets and followed in the custom curb ramp details. The following comments apply to the SWPPP document. Show the 1 mile radius on the map. The Trott Brook is considered a Special water and must be called out on the map and in the table. Page 5