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Response - PC staff_report_Eagle_Bluff - 7-20-21 Meeting Memorandum TO: Erik Henricksen, Jill Sinclair, Matt Unmacht, Ryan Pinkall and Bob Generous - City of Chanhassen FROM: Mark Rausch, PE and Tyler Stricherz, EIT CC: Marty Schutrop DATE: August 2, 2021 SUBJECT: Response to Planning Commission Staff Report July 20th, 2021 Note: Alliant responses to RPBCWD comments are shown in red. Building 1. A building permit must be obtained prior to beginning work at the property. Noted Engineering 1. A cross access agreement shall between Lots 1 and 2, Block 1 shall be recorded concurrently with the final plat. Noted, Developer to work on agreement. 2. The final plat shall be updated to include a 10-foot drainage and utility easement on the northern portion of Lot 2, Block 1 as well as abutting the 68.38 foot long property line in the northwestern corner of the lot. Easement has been updated on the final plat. 3. All existing and proposed improvements located within public drainage and utility easements will require encroachment agreements and shall be recorded concurrently with final plat. Noted, Developer to work on agreement. 4. Stormwater facilities shall be privately owned and maintained, and located outside of public drainage and utility easements, and the final plat shall be adjusted accordingly. The drainage and utility easement has been updated to not include the private infiltration basin. 5. The applicant and their Engineer shall work with City staff in amending the construction plans to fully satisfy staff comments prior to the recording of the final plat. Eagle Bluff August 2, 2021 Page 2 Noted. 6. If the sanitary service lateral is within 50 feet of the existing well, the well will be required to be abandoned and the plans updated accordingly. All requirements set forth by the Minnesota Department of Health regarding the abandonment of the well must be adhered to. The note has been added to the site and utility plan. 7. The developer will be required to pay the following fees prior to recording of final plat: Noted a) Surface Water Management fee: $21,650.00 b) A portion of the water hook-up charge: $2,476.00/unit, or $4,952.00 for the two units c) A portion of the sanitary sewer hook-up charge: $691.00/unit, or $1,382.00 for the two units d) Park dedication fee: $5,800.00/unit e) GIS fees: $100 for the plat plus $30 per parcel, or a total of $160.00 Environmental Resources 1. Tree preservation fencing shall be installed around existing trees to be saved prior to any construction activities and remain installed until completion. Tree protection fence has been identified on the plans. 2. Buffer yard plantings to the east of the proposed home site include one overstory tree, two ornamental trees and four shrubs, unless sufficient existing vegetation remains. Developer to work with the city at the time of construction for proposed home to determine sufficient existing vegetation. Fire 1. Private road will need to follow City of Chanhassen Code for Private Roads – including a turnaround for emergency vehicles. A hammerhead turnaround for emergency vehicles has been added to the proposed plan. The emergency turnaround shall be class 5. Parks 1. Full park fees in lieu of additional parkland dedication and/or trail construction shall be collected at the rate in force upon final plat submission and approval. Noted. Planning 1. The front setback for Lot 1 shall be from the point at which the lot measures 100 feet. The front setback measures exactly at 100’ As it was submitted prior. The dimension on the site plan is moved so the setback line is visible. 2. An access and maintenance agreement for the private street shall be recorded with the plat. Eagle Bluff August 2, 2021 Page 3 Developer to coordinate agreement. Water Resources 1. The applicant shall provide to the City the approved Riley Purgatory Bluff Creek Watershed District permit prior to issuance of building permits. Noted, currently working on obtaining permit. 2. The applicant shall submit an updated geotechnical report with borings in the location of the proposed infiltration basin to ensure infiltration is feasible at that basin location upon resubmittal of construction plans. Borings are in process of being scheduled and the report will be provided when available. Infiltration test for basin 1 has been provided with this submittal. 3. The applicant shall provide a buffer along the southern edge of the infiltration basin to minimize the amount of sediment entering and clogging the infiltration basin upon resubmittal of construction plans. A retaining wall has been added to provide buffer. 4. The applicant shall provide evidence that Wetland 1 will remain a viable wetland with the proposed plan that reduces hydrology to the wetland upon resubmittal of construction plans. Wetland 1 has been proven to be a viable wetland with the bounce and inundation calculations added to the stormwater management plan. 5. The applicant shall amend the plans to show double row of silt fence placed at the buffer edge of Wetland 1 instead of at the wetland edge as currently shown. The silt fence is as far from the wetland as possible while maintaining the ability to grade the proposed updates. 6. The applicant shall provide a SWPPP if one was created. If there is not a SWPPP, the applicant shall amend the grading notes on Sheet 6 as appropriate. Grading notes have been amended. 7. The applicant shall provide the following details for the stormwater infiltration basin upon resubmittal of construction plans: a. The infiltration basin shall be restored with a native seed mix or other appropriate plantings per MPCA guidelines instead of sod as proposed. The basin is now being restored via native seed. See notes on canopy and restoration plan. b. A defined basin overflow shall be designed instead of letting water spill over the entire northern berm. Basin overflow has been updated. See cross section detail on grading plan. Eagle Bluff August 2, 2021 Page 4 8. The applicant shall provide the LFE/FFE for the proposed building upon resubmittal of construction plans to show freeboard is being met. This was provided on initial submittal. As noted in the grading legend. The garage floor elevation is 924.5 and the walkout low floor elevation is 915.5. 9. The applicant shall provide an O&M plan and agreement for the infiltration basin and outline the parties that will be responsible for O&M prior to issuance of building permit. Draft O&M plans have been created for both lots individually. 10. The applicant shall submit a wetland delineation report for Wetland 1. The plans will need to be updated showing the approved wetland boundary and subsequent buffers based on the delineation. The wetland Scientist Kjolhaug has started to process of delineating Wetland 1. The report will be provided when acquired. 11. The applicant shall provide the SWMP fee of $21,650.00 to the City prior to the recording of final plat. Noted.