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Fox Hill Drive Response to Comments-8-8-22 www.alliant-inc.com 733 Marquette Avenue, Suite 700 612.758.3080 MAIN | 612.758.3099 FAX Minneapolis, MN 55402 Fox Hill Drive Memorandum RESPONSE TO COMMENTS To: Erik Henricksen, PE, Sharmeen Al-Jaff, Joe Seidl, PE, City of Chanhassen From: Seth Loken PE CC: Denali Homes, Andy and Maria Awes Date: August 8th, 2022 Subject: Response to City Planning Commission Comments This memo provides a response to city planning commission comments. On July 19 th the project was tabled by City of Chanhassen planning commission for a request to explore saving more trees throughout the property. Two exhibits have been added to demonstrate what we believe to be max savings: Removal of the stub road requirement completely, conversion of full public ROW to private roadway contained within outlot, but it is our understanding that the stub road is a requirement per city comprehensive planning. We will continue to work with city staff to increase the canopy coverage to the maximum extent possible but believe based on the requirements of both city and watershed district, this will be the maximum canopy coverage for the additional 3 lots. Since the planning commission, a geotechnical investigation has occurred, and this plan is updated to reflect the initial findings. Responses to city comments are shown below in red. SUBDIVISION Engineering: 1. Any underlying easements within public easements, including public right-of-way, must be vacated or released prior to recording of the final plat. Noted 2. An additional 10 feet of right-of-way shall be dedicated along Carver Beach Road prior to recording of final plat providing a 50-foot-wide right-of-way in total. 10’ of additional ROW shown. Fox Hill Drive Response to Comments PAGE 2 www.alliant-inc.com 3. The ESCP and tree preservation plans must address the excavation of the proposed stormwater conveyance system on Lot 1, Block 1 and it’s impacts upon submittal of final plans for review and approval. Erosion control has been updated. 4. The street within the newly dedicated 50-foot right-of-way extending from Fox Hill Drive shall be constructed to the maximum extent feasible. Road has been extended to the maximum extent possible. 5. The applicant shall provide exhibits illustrating the alignment, profile, and grades of the proposed street design from Fox Hill Drive to the future connection at Big Woods Drive upon submittal of final plat. Noted. Will provide with final ppat. 6. The applicant and their Engineer shall work with City staff in amending the construction plans, dated June 17, 2022 prepared by Seth Loken, PE with Alliant Engineering to fully satisfy construction plan comments and concerns. Final construction plans will be subject to review and approval by staff prior to commencement of any construction activities. Noted. 7. The applicant shall enter into a Development Contract and pay all applicable fees and securities prior to recording of final plat. Noted. Water Resources Recommendations: 1. Private stormwater BMPs to serve the needs of the development must be wholly located outside of all public easements upon submittal of the final plat. Noted. 2. The applicant shall provide a copy of conditional approval from the RPBCWD as part of the final plat submittal. Noted. 3. The applicant shall provide a copy of the geotechnical report and infiltration test results as part of the final plat submittal. Geotechnical report provided. Shows seams of sandy/silty soil with clay soils. Infiltration tests were not conducted initially as to not remove any trees. Based on preliminary findings, infiltration tests will occur. 4. The applicant must update the Hydrologic and Hydraulic models per City and Watershed District comments and submit updated computations and models in their native forms with the final plat and final construction plans. Noted. 5. The applicant must demonstrate that the proposed project will not raise the 100-year high water level of the onsite wetland as part of the final plat submittal. Noted. 6. The applicant must demonstrate that the proposed project will be in compliance with the 3-foot freeboard requirement to ponding features as part of the final plat submittal. Freeboard in general is well over 3’. See grading plan/stormwater. 7. The applicant must confirm the stormwater routing of the onsite BMPs and include pipe profiles, details of outlet control structures, underground infiltration details, and connections to public infrastructure as part of the final plat submittal. Noted. 8. The applicant must work with staff to improve the BMP configuration to the maximum extent given the restrictions of the site and RPBCWD rules. The applicant and engineer Fox Hill Drive Response to Comments PAGE 3 www.alliant-inc.com understand the city’s desire to consolidate BMP’s. Watershed rules stipulate that abstraction volume must be provided prior to discharging to a wetland, in order to provide this to meet the watershed’s rules the site needs a BMP prior to discharging to the wetland. The alternative to providing the BMP would be to pipe all disturbed area and impervious surface that drains to the west, this would result in significant tree removals and change in hydrology to the wetland. The alternative BMP configuration for drainage that is routed directly to Lotus Lake would be to pipe all disturbed area and impervious surface to a BMP downstream of lot 1 block 1. In order to do this would result in a significantly larger footprint meaning further tree removal and disturbance to existing lakeshore and slopes. Additionally, the BMP for lot 1 block 1 is confined due to existing utilities near the lakeshore. 9. The applicant shall enter into an Operations and Maintenance Agreement for any proposed privately owned stormwater facilities which shall be recorded concurrently with the final plat. Noted. Parks: 1. Full Park fees in lieu of additional parkland dedication and/or trail construction shall be collected as a condition of approval for the four lots. The Park fees will be collected in full at the rate in force upon final plat submission and approval. Based upon the current single- family park fee rate of $5,800 per dwelling, the total Park fees for the three new additional homes would be $17,400. Noted. Environmental Resources Coordinator: 1. Tree protection fencing shall be installed prior to any construction activities and remain in place until construction is complete. Noted. 2. Any trees removed that are shown on plans dated as preserved shall be replaced at a rate of 2:1 diameter inches. This is noted based on a final approved plan. 3. A Conservation Easement shall be dedicated over the wooded side yards on Lots 1 and 2. To be provided at final plat. 4. The applicant will relocate the infiltration basin to the edge of the wooded area on Lot 2 and eliminate the fragmentation of the wooded wetland buffer. Infiltration basin moved towards the home to eliminate fragmentation of wooded wetland buffer. 5. The applicant shall revise the tree removal plans and calculations to show tree removal for all stormwater infrastructure and utilities needed on site. Tree removal plans have been provided. Fox Hill Drive Response to Comments PAGE 4 www.alliant-inc.com Building: 1. A final grading plan and soils report must be submitted to the Inspections Division before building permits will be issued. Noted. 2. Building permits must be obtained before beginning any construction. Noted. 3. Building plans must provide sufficient information to verify that proposed buildings meet all requirements of the Minnesota State Building Code, additional comments or requirements may be required after plan review Noted. 4. Retaining walls (if present) more than four feet high must be designed by a professional engineer and a building permit must be obtained prior to construction, retaining walls under four feet in height require a zoning permit. Noted.