07/08/2020 P&Z Packet - Laserfiche WebLink

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The City's stormwater management requirements for rate control and infiltration have also been met. The City's requirements for rate control and infiltration are the same as RCWD. The applicant has submitted the revised plans to RCWD for final review and approval. During the Public Hearing for the project there were concerns raised by a few of the adjacent property owners. Staff, the developer, and developer's engineer have worked to address these questions. As a result the downstream ditch conditions were surveyed to obtain baseline data of the existing conditions. A culvert on the Rehbein parcel was reviewed by the property owner for blockage. The proposed outlet and associated drainage and utility easement to the Vickers's parcel is being processed. The original design for Pond 100 outlet was a conventional outlet structure and discharge pipe. This design required a drainage and utility easement. Note there is an existing Great River Energy easement that already encumbers this same area. The Vickers we concerned about the proposed outlet discharge and thus granting an easement was declined originally. The developer then re -designed the outlet without and easement. This revision included a plunge pool dissipator and enlargement of the pond. However there were still concerns regarding erosion and overland flow. Staff met with the Vickers on Thursday, May 7, 2020 to review options for a stormwater outlet. The owners explained their concerns over possible ditch erosion and ongoing maintenance concerns. Staff explained that if an easement is obtained, the City will be responsible for ongoing maintenance of the improvements including the outlet area. The owner informed staff of their preference for a piped outlet with a dissipater still incorporated with the understanding that it is city maintained. After further discussions with the Vickers, developer and City, the final design includes a conventional outlet structure with discharge from Pond 100 to the private ditch with rip rap armor and no plunge pool dissipator. The pond remained oversized further reducing the rate of runoff from the site which is well below the existing conditions. A Permanent Drainage & Utility Easement agreement between the Vickers and the City has been agreed too. The City will be responsible for stormwater maintenance within the easement area. Great River Energy (GRE) has also approved the drainage easement and storm pipe through their easement. Phasing The site will be mass graded in one (1) phase and developed in two (2) phases. Phase 1 has 35 lots and Phase 2 has 33 lots. Utilities Public water, sanitary and storm sewer utilities will be installed within the development. I