Enclave at Regal Oak Minnetonka, MN November 4, 2016 AE#14300

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Rosaline Sullivan
5 years ago
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1 Enclave at Regal Oak Minnetonka, MN November 4, 2016 AE#14300 RE: ENCLAVE AT REGAL OAK DEVELOPMENT Additional Information for Planning Department City of Minnetonka Planning Commission, Per the most recently attended planning commission meeting, October 6, 2016, a few items were unclear and needed additional clarification and field work. The items below have been addressed, and we feel the proposed development meets the City Ordinance criteria. Tree Preservation Per comments from the City, we have updated our tree inventory. Currently on the property there are 31 High Priority (HP) trees within the developable area. We are proposing to remove 10 HP trees with an overall HP tree removal percentage of 32.3% (10 of 31 removed), which meets the 35% threshold set forth by the City. All of the trees are located within the Basic Tree Removal Area (BRA), as defined by the City. The species of trees to be removed are Walnut (5), Hackberry (1), Arbor Vitae (1), Cherry (1), Pine (1), and Boxelder (1). Reference the attached plans for additional information and details. The required tree replacement is computed to be 54 DBH, and we propose to meet and exceed the requirement for a 56 DBH replacement. Also, we propose to replace similar trees species as those removed, as approved by City staff. No more than 25% of one species will be planted, unless approved by City staff. Trees will not be planted within 15 from back-of-curb on deciduous trees, and not within 20 for coniferous trees as requested by the City. Replacement trees will be planted after home construction. Tree preservation was completed by using creative design, custom grading, minor retaining walls, and establishing the building pad and driveway locations. Trees along the eastern property line will be protected and a dedicated conservation easement is proposed along the Mesic Oak Forest boundary. Trees identified to be saved will have perimeter fencing during construction activities. Steep Slopes The provisions of the steep slope ordinance have been reviewed and we find the ordinance does not apply to the development. As indicated on the attached memo Minnetonka Steep Slope Ordinance as Applicable to the Enclave at Regal Oaks, the steep slopes are present at the north end of the properties, but the proposed development does not encroach within the steep slopes. See the enclosed memo for additional clarification.

2 Enclave at Regal Oak Minnetonka, MN November 4, 2016 AE#14300 Stormwater Management Treatment of stormwater and controlling runoff rates plays a major factor in any development. We propose to maintain the feel and look of the property by minimizing grading efforts and precisely locating stormwater facilities for maximum efficiency and minimal removals. Per direction and recommendation from the City, we have revised our storm water management plan approach to offsite drainage as follows: Onsite drainage: Onsite drainage for the development will be treated with a combination of bioinfiltration basins and grassy swales. The proposed northern bioinfiltration basin will treat a majority of the development, while a secondary bioinfiltration basin will be constructed on the south end of the property to provide additional treatment. The combination of the stormwater BMP s will exceed the standards set forth by the City for runoff rate control and water quality treatment of total phosphorus (TP) and total suspended solids (TSS). Offsite drainage: We will not capture and treat for water quality the existing stormwater conveyance from Arbor Lane, and will let the stormwater path continue as it is today. The area around the existing energy dissipater outlet will be reinforced to prevent additional erosion and required maintenance. Reference the attached Stormwater Management Plan for details regarding the stormwater approach and proposed design. Maintenance Access to Stormwater Treatment Basins Per comments from the City, we have defined an access route to each stormwater treatment facility. Access to the northern basin is provided between proposed lots 3 and 4. The D&U easement has been expanded to a width of 14 feet. The average slope along the path is 4:1, which can be easily maneuvered with maintenance vehicles. Access to the southern basin is accessible from the City right-of-way. Access easements will be documented on title work for future homeownership knowledge. No trees or utilities will be installed along the maintenance access routes. See the enclosed drawings for additional information. Thank you, and we look forward to speaking with you soon.

9 POTENTIAL PLAN REVISIONS GOPHER STATE ONE CALL (800) TOLL FREE (651) LOCAL N

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