Agenda - Parks and Recreation Commission - 05/11/2017

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Review File: Riverstone Sketch Plan Exhibits Engineering Review March 29, 2017 Page 2 of 5 9. Final plat documents must have plan and profiles for streets, sanitary sewer, storm sewer and watermain. Plan view must be shown for all pipes extending outside of the right-of- way. Sheet Snecific Comments: Sheet 4: 1. A drainage and utility easement must be dedicated along Puma Street for the future Lift Station. See additional comments on utility plan. Sheet 8: 1. The future lift station must be placed in a drainage and utility easement outside of the public right-of-way. The lift station must have a driveway access from Puma Street. 2. Water valves must be added mid -block near Lot 14, Block 9, Lot 8, Block 13, Lot 7, Blcok 12, Lot 14, Block 6, Lot 10, Block 5 and Lot 8, Block 11. 3. The manhole information for the structure near Lot 43, Block 9 is not correct. The rim and invert elevations are reversed. The invert elevation is lower than the downstream invert. 4. Rim and invert elevations are required on the proposed sanitary sewer in Puma Street. The responsibility for construction of this line and the lift station has not been determined; however, design information must be shown on this plan to ensure that the proposed line will function properly. 5. Watermain must be placed on the north side or east side of the road. The location must be changed adjacent to Block 6. 6. Sanitary sewer north of the lift station can be 8", not 18" diameter pipe. Sheets 10-13: 1. The grading plan must be revised to achieve the following separation distances per the Lower Rum River Watershed Management Organization rules (LRRWMO). The lowest floor elevation of all development, including basements, must be at least 3 feet above the highest anticipated ground water table, 2 feet above the designated or designed 100-year flood elevation, or 1 foot above the emergency overflow, whichever is higher. This requirement may be waived if evidence that a lesser separation can be achieved is: • submitted and certified by a geotechnical engineer • reviewed and approved by the city engineer or other party designated by the city engineer, and • approved by the LRRWMO.