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Final Plat Application 16-3867 Tanager Estates Page 3 c. The proposed road should be connected to the existing cul-de-sac with 15' radii. Curb and gutter should be tapered 3' at connections. d. Notes should be included that state removal limits for connection to Heritage Lane shall be coordinated in the field with the City prior to any demolition within public right-of-way. e. The existing wall on the south side of the proposed connection will need to be relocated to allow for construction of the new street. In addition, the existing 14" maple tree may have to be removed. Further detail should be provided accordingly. 3.2. Drainage and Utility easements should be indicated on the plan in order to verify adequate coverage of public facilities. 3.3. Notes should be included to indicate the following: a. Work in Public right-of-way must be coordinated with the City. Contractor must provide minimum 48 hour notice prior to any work. b. Trashguards will be installed on all non -submerged aprons. 3.4. The storm sewer layout should be revised to better fit site conditions as follows: a. The outlet pipe for the wetland north of the road should be relocated to cross the proposed retaining wall at a perpendicular angle. An additional manhole should be provided between CBMH-I and 2 at approximately station 1+90 to allow for this pipe. b. The pipe connecting to the pond should be located a minimum 10' from the end of the proposed retaining wall to allow for adequate access should future maintenance be required. CBMH-1 should be relocated further northeast along the curb line to allow adequate separation between pipe and wall. 3.5. Pipe characteristics should be provided for all proposed storm sewer and culverts (i.e. invert elevations, length, slope, and material). 3.6. The low point elevation of the road is indicated at 94 1.0, but the low point catchbasins are indicated to have a rim elevation of 942.0. Rim elevations should be coordinated with road profile and 3% cross - slope. A minimum 2' cover should be provided over storm sewer. Castings in curb and gutter should be sumped 0.1' from gutter elevation. 3.7. The vertical curves provided at the connection to Heritage Lane and at the low point do not meet minimum State Aid values for a 25 mph design. However, increasing values to meet a 25 mph design would require higher retaining walls and may invite higher traffic speeds. Maintaining a more undulating road profile would more likely result in lower traffic speeds, and a 25 mph design is not necessary adjacent to a cul-de-sac. Therefore, the proposed road profile should be considered an adequate design for site conditions. Final Gradime and Stormwater Pollution Prevention Plan 4.1. A Stormwater Pollution Prevention Plan (S WPPP) must be included that meets NPDES requirements outlined in the State's General Permit to Discharge Stormwater Associated with Construction Activity. SWPPP should take into account that Tanager Lake is impaired for nutrients. A checklist for required information can be found at: hM.*Ilwww.yca. state. mg. us/s ites/defadtlles/wg-strm2-47. doc 4.2. Drainage and Utility easements should be indicated on the plan in order to verify adequate coverage of public facilities. 4.3. Perimeter erosion control should be installed by the Contractor and inspected by the City prior to any other work. Contractor must provide a minimum 24 hour notice prior to inspection. 4.4. Additional notes should be provided regarding construction of infiltration areas. Infiltration areas should be constructed or maintained off-line until all upstream areas are permanently stabilized. If areas are to be maintained offline, temporary piping and/or ditching should be indicated on plan.