Agenda - Council - 05/09/2017 - Laserfiche WebLink

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Review File: Woodlands 4th Addition Final Plat Engineering Review May 4, 2017 Page 2 of 3 Storm Sewer Construction C5.11: 1. Revise storm sewer structure table to match detail STO 4. Street Construction Sheets C6.10, C6.11: 1. Screen or ghost the valves, catchbasins and manholes on these sheets. 2. The bituminous trail must be 10 feet wide. Evaluate connecting the new bituminous trail to the existing bituminous trail for access purposes. 3. The space between the pedestrian ramp and the sidewalk shall be concrete. The pedestrian ramp to the new trail shall be 10 feet wide. 4. Number the pedestrian ramps in plan view to match the details. 5. A pedestrian ramp is required at Lot 10, Block 3. Preliminary Tree Preservation Plan C7.10: 1. Add notes: All erosion control needs to be installed prior to any tree clearing activities. 2. Trench to cut tree roots prior to commencing removal activities. Details C8.11, C8.12: 1. General note 12 states 24 hour notice, Specific note 2 states 3 hours. Revise the 24 hours to read 3 hours. This is the City Standard. 2. Add to note 12: The developer's escrow will be billed if the City cleans the streets. 3. The MNDOT standard Curb Ramp details now consist of 6 sheets. A project manual which includes the bid form, contract and specifications must be submitted with the final plans. Stormwater Model: The stormwater model indicates the site provides the required rate control for the 2, 10 and 100 year storms. Volume control cannot be provided on site due to the shallow depth to groundwater. Calculations and a cost estimate for an infiltration basin sized for this project must be submitted to the City for review. The City will use this information to determine the amount to contribute to the infiltration mitigation fund. The engineer provided an estimate of $2,500 for the infiltration mitigation. Staff feels this is too low and recommends a contribution of $9,370. This is broken out as follows: