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Response to City of Chanhassen Comments MemoJanuary 24, 2017 S►A THRE-EERGQUIST9 INC. 150 SOUTH BROADWAY, WAYZATA, MINNESOTA, 55391 TEL:(952)476-6000 FAX:(952)476-0104 wEE:www.SATHRE.COM RE: Response to City of Chanhassen Comments Dates September 15, 2016 For: Arbor Glen To whom it may concern: We have provided line by line responses to your review letter dated September 15, 2015 to help the review process for the Arbor Glen Project in the City of Chanhassen. Buildin¢: 1. Final grading plans and soil reports must be submitted to the Inspections Division before building permits will be issued. Response: See attached. 2. Engineered design and building permits are required for retaining walls exceeding four feet in height. Response: A note has been added to the plans. The contractor will provide plans for these walls once a contractor has been chosen. 3. Each lot must be provided with a separate sewer and water service. Response: The requested revision has been made. 4. Demolition permits must be obtained before demolishing any structures. Response: The requested revision has been made in Note 21 on page 6. 5. Proper removal, abandonment or sealing of storage tanks, on-site septic systems, wells, etc. is required. Permits are required, as applicable. Response: Additional detail has been added to Note 11. t 1`� REG�t�'EASoFP GHANNASSENPLANNING�>E�T 1. There is an existing field entrance (curb cut) on 101. The curb cut shall be removed since access will be from CSAH 18. Response: The requested revision has been made. It is shown on Page 2. 2. The drainage along the corridor right-of-way should remain in a similar flow direction. It appears from the contours that with the building of the berm there may be an area that does not drain. Response: The requested revision has been made and drainage flows through the berm. 3. Any grading or other work within the road right-of-way will require a permit from Carver County. Response: The requested revision has been made in Note 22 on page 6. 4. The City shall require a drainage and utility easement to be granted over Outlot A. Response: The easement has been added to the final plat. 5. A 10 -foot easement is required on the rear lot lines of Lots 1 through 9, Block 3. Response: The requested revision has been made. 6. The topography must show 100 feet beyond the property boundary to the west, including the first floor elevation of the building on the adjacent lot. Response: The requested revision has been made. 7. The grading plan must be revised to include the house pads and driveway locations Response: The requested revision has been made. 8. The low floor elevations of these proposed homes must be revised to comply with a three-foot separation from groundwater encountered during construction. Response: We feel the groundwater encountered is perched water. The actual ground water table is the level of the adjacent wetland. 9. The lowest building openings of Lots Sand 6, Block 3 must be adjusted to a minimum of one foot above the emergency overflow (ECF) elevation or the EOF must be relocated. Response: The EOF has been removed and the revision no longer applies. 10. A standard lot benching detail shall be included in the plan set. Response: The requested revision has been made. 11. The grading plan must be revised at the back of Lot 5, Block 2, between Lots 2 and 3, Block 3 and between the retaining walls to be no greater than 3:1. Response: The requested revision has been made. 12. The Surface Water Pollution Prevention Plan with all elements required by the NPDES Construction Permit shall be prepared and supplied to the city for approval with the final plat and prior to any earth -disturbing activities. Response: The SWPPP is attached. 13. Proof of the NPDES Construction Permit having been procured by the applicant shall be supplied to the city prior to any earth -disturbing activities. Response: The NPDES permit will be supplied prior to the start of grading. 14. The entire buffer area shall be placed into Outlot C and the outlot shall be dedicated to the city. Response: The requested revision has been made. 15. The trident underground storage and filtration system shall be located in a separate outlot from Outlot C. Response: The underground storage system has been replaced by a water harvesting system. 16. A detailed planting schedule, including types and size of plants if plugs are to be used or the seed composition, source and application rate and method if the area is to be seeded, must be provided to the city for review and approval before final plat. Yellow tags for the plant source must be provided to the city. The plants shall be native and free of neonicotinoids. Response: A note has been added to the landscape plan. 17. A detailed maintenance schedule for establishment of vegetation within the primary zone and buffer shall be provided to the city before final plat. Response: A note has been added to the landscape plan. 18. The soils within the buffer area shall be prepared by ripping to a depth of 12 inches to loosen them and shall meet MnDOT Specification 3877-3 for Sandy Clay Loam Topsoil Borrow. Response: A note has been added to the landscape plan. 19. All residential lots shall have a minimum of six inches of topsoil meeting the specifications for MnDOT Specification 3877-1 for Common Topsoil Borrow placed on all areas to be seeded or sodded. Response: See Note 13A on Grading, Drainage, and Erosion Control sheet. 20. Monuments indicating the Bluff Creek Overlay District shall be placed at every other property corner and at an angle of deflection greater than seven percent, but in no case shall they be greater than 150 feet apart. The signs shall be installed immediately subsequent to completion of final grade below the wall and before any building permits are issued for Lots 2 through 11, Block 3. The plans shall be changed to reflect this requirement before final plat. Response: The wetland buffer monuments have been added to the plan. 21. Retaining walls shall be owned and maintained by a Homeowners Association (HOA). The plan set shall call out the material for these retaining walls. Response: Noted. 22. Walls over six feet tall (Wall B) shall not be boulder walls. Tiered boulder walls with a combined total height greater than six feet tall must have adequate spacing between such that they do not structurally impact one another. Response: See Note 15 on Grading, Drainage, and Erosion Control sheet. 23. The vegetation between tiered walls shall be low or no maintenance. Response: There are no longer tiered walls on the plan. 24. The emergency overflow (EOF) between Lots 5 and 6, Block 3 flows towards Wall A and Wall B. Staff will work with the engineer designing the storm water system and the structural engineer designing the walls regarding conveyance of the water or relocation of this EOF. Response: The requested revision has been made. 25. A vertical curve is required for the transition between +3.14% and -1.57% grade on the South Private Drive. Response: The requested revision has been made. 26. The curve and line table for the horizontal alignments of all streets must be revised to be consistent with the plan sheets. Response: The requested table has been added to Sheet 2. 27. The specifications for this project must be revised to match the current City of Chanhassen Standard Specifications and Detail Plates and the proposed plan set, including but not limited to the pavement design. Response: The attached plan set does not contain the updated detail plates but as per my conversation with Stephanie Smith, I will add them when they are completed by the City of Chanhassen. 28. The applicant's engineer shall submit documentation for the design speed selection and show turning movements in the plan set to demonstrate that larger vehicles will be able to navigate the roadway curvature. Response: See attached. 29. The applicant must obtain permits from Carver County for construction of an access and all other work in their right-of-way. They must also comply with the comments received from the Carver County Engineering Office. Response: The requested revision has been made. 30. An ADA -compliant pedestrian ramp shall be constructed where the trail intersects Lyman Boulevard. Response: The requested revision has been made. 31. The City of Chanhassen Standard Detail Plates for pedestrian ramps shall be added to the plan set. Response: The requested revision has been made. MNDOT has requested that we use their detail plates and they are attached. 32. The applicant must obtain a permit for any work in the MnDOT right-of-way. Response: The application has been applied for and is under review. 33. Profile grades shall be shown for the sidewalk and bituminous trail. Response: A note has been added to the landscape plan. 34. The plan must have a design grade that developer and engineer are confident that the construction process will achieve the minimum of 0.40%. If the grade is flatter than 0.40% at the time of acceptance, the city will require the sanitary sewer be excavated and reconstructed to meet the grade requirement. Staff recommends use of 0.50% minimum design grade. Response: A note has been added to the landscape plan 35. The 8 -inch watermain pipe plans shall be revised to call out C900 as the pipe material and shall be installed per the City of Chanhassen Standard Specifications and Detail Plates. Response: The requested revision has been made. 36. The watermain connection to Highway 101 shall be relocated away from the stormwater infiltration system. Response: The requested revision has been made. 37. The proposed sanitary sewer and water main shall become city -owned after construction and acceptance by the city council. Response: Noted. 38. The applicant must meet the storm water management standards prescribed in Section 19-144 of city code which incorporates the NPDES construction permit by reference. This requires a volume reduction of 1.0 inches of water quality volume from all new impervious surfaces or provide evidence that the site, in its entirety, meets the criteria by which infiltration is infeasible as discussed in the NPDES permits. If adequate evidence is provided that infiltration is found to be infeasible, then the applicant must evaluate other methods of abstraction. Response: See attached storm water calculations. 39. The proposed storm water management system must meet the required reduction in total phosphorus and total suspended solids. Response: The requested revision has been made. 40. The storm water catch basins inside the cul-de-sac bubble shall be relocated to the curb line and comply with the Chanhassen Standard Detail for cul-de-sacs. Response: The requested revision has been made. 41. A Homeowners Association (HOA) must be established that is responsible for the maintenance and operation of the trident system if it is approved. Response: The underground storage system is no longer proposed. We have worked the watershed district to prepare a maintenance plan. 42. The city -authored maintenance agreement for stormwater management facilities shall be revised accordingly, executed and recorded against the property. Response: We have worked the watershed district to prepare a maintenance plan. 43. The applicant shall develop an operations and maintenance manual which shall specify anticipated inspection and maintenance, as well as schedule, necessary to ensure there is not significant decreases in the practices' efficacies. This operations and maintenance manual shall be referenced in the maintenance agreement. Response: We have worked the watershed district to prepare a maintenance plan. 44. SWMP fees estimated to be $33,346.50 are due at the time of final plat. Response: Noted. 45. The applicant is responsible for applying for, procuring approvals from and meeting the requirements of all other agencies with jurisdiction over the project including, but not limited to, the Minnesota Pollution Control Agency and the Riley -Purgatory -Bluff Creek Watershed District. Response: Noted. 46. Water and sewer partial hookups are due at the time of final plat. The partial hookup fees will be assessed at the rate in effect at that time. Response: Noted. Environmental Resources: 1. A total of 18 additional overstory trees shall be planted throughout the development. The applicant will submit a revised landscape plan. Response: See attached landscape plan. 2. A wetland buffer restoration plan shall be included in the revised landscape plan. Response: See attached landscape plan. The applicant shall submit a tree inventory and tree preservation calculations as required by ordinance prior to final plat review and approval. Response: The plan has been previously submitted. Fire: 1. Provide/maintain three-foot clear space around fire hydrants. Response: Noted. 2. The two private driveways will be required to have address signage which shall be submitted to the Chanhassen Building Official and Fire Marshal for review and approval. Response: Noted. 3. Relocate the proposed fire hydrant located by Lot 1, Block 2 to the property line between Lots 3 and 4, Block 2. Response: The requested revision has been made. 4. Prior to combustible home construction, fire apparatus access roads capable of supporting the weight of fire apparatus shall be made serviceable. Response: Noted. 5. Street signs (temporary allowed) shall be installed prior to building permits being issued. The Fire Marshal must approve street signage. Response: Noted. 6. Prior to combustible construction fire hydrants shall be made serviceable. Response: Noted. Parks: 1. Full park dedication fees shall be collected per city ordinance in lieu of requiring parkland dedication. Response: Noted. 2. Construction of Great Plains Boulevard trail from the southwest intersection of Lyman Boulevard and Great Plains Boulevard traveling south for approximately 675 feet to the southern terminus of the property. The developer shall provide design, engineering, construction and testing services required of the Great Plains Boulevard trail. All construction documents, including material costs, shall be delivered to the Park and Recreation Director and City Engineer for approval prior to the initiation of construction. The trail shall be 10 feet in width, surfaced with asphalt and constructed to meet all city specifications. The applicant shall be reimbursed by the City for the cost of the aggregate base, trail surfacing, and storm water systems utilized to construct the trail as well as for redesign of the plans if necessary. This reimbursement payment shall be made upon completion and acceptance of the trail and receipt of an invoice documenting the actual costs for the construction materials noted. Labor and installation, design, engineering and testing services are not reimbursable expenses. Response: It was our understanding that the cost of constructing the retaining wall was also to be reimbursed. Planning: 1. The developer shall install a gateway element similar to that at Southwest Village which includes decorative fencing and landscaping. Response: A monument sign has been proposed in the Northwest corner of the site. The location of the sign may be limited by the gas easement. If you have any questions, comments, or concerns, please contact me at 952-476-6000 or 612-741-9830. Daniel L.Schmidt P.E. SATHRE-BERGQUIST, INC.