Agenda - Council - 06/13/2017 - Laserfiche WebLink

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Review File: Trott Brook Hall Addition Final Plat and Site Plan Exhibits Engineering Review June 8, 2017 Page 4 of 4 Sheet 5.2: 1. The designer 's training information must be added to this sheet listing the date of the class and expiration of the certificate. 2. Add a table showing the BMPs to be used on the project and the estimated quantities. 3. Label Trott Brook and the major roads on the map. Stormwater Management Plan: A stormwater summary and HYDROCAD reports were provided with the submittal. The infiltration basin is sized for the new impervious areas. The existing impervious areas drain over the new impervious areas to the proposed infiltration basin. The site has 2 locations where stormwater leaves the site. The new impervious areas flow to both locations. Infiltration/ rate control will be required for both outfalls. The infiltration and rate control must be sized for the total flow coming to the respective outfall. The calculations will need to be revised to reflect the actual flows coining to the infiltration/ detention areas. 1. Soil borings are required in the area of the infiltration practices to verify the soils are suitable for infiltration. 2. The bottom of the infiltration basins must be at least 3 feet above the ground water level, 3. If water will be discharged directly to the infiltration area, then a sump manhole or water quality treatment structure must be installed up stream of the infiltration basin to capture sediment and debris. 4. Water cannot be directly discharged to the wetland. It must be treated as noted above. 5. Detailed procedures for constructing the infiltration basins and bringing them online will be required in the final plans. 6. The title of the HydroCAD models must be revised to include the project name and designate Existing or Proposed conditions. 7. The ponds must be less than 10 feet deep to comply with the recommended guidelines in the Minnesota Stormwater Manual. 8. A Minimal Impact Design (MIDS) model or P8 model must be submitted showing the water quality improvements provided by the stormwater system. This site drains to the Trott Brook. Detailed calculations per the Ramsey Development Requirements for TMDL must be submitted. The updated guidance sheet is attached.