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07/08/2020 P&Z Packet
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07/08/2020 P&Z Packet
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07/08/2020
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The City's stormwater management requirements for rate control and infiltration have <br />also been met. The City's requirements for rate control and infiltration are the same as <br />RCWD. <br />The applicant has submitted the revised plans to RCWD for final review and approval. <br />During the Public Hearing for the project there were concerns raised by a few of the <br />adjacent property owners. Staff, the developer, and developer's engineer have worked to <br />address these questions. As a result the downstream ditch conditions were surveyed to <br />obtain baseline data of the existing conditions. A culvert on the Rehbein parcel was <br />reviewed by the property owner for blockage. The proposed outlet and associated <br />drainage and utility easement to the Vickers's parcel is being processed. <br />The original design for Pond 100 outlet was a conventional outlet structure and discharge <br />pipe. This design required a drainage and utility easement. Note there is an existing Great <br />River Energy easement that already encumbers this same area. The Vickers we concerned <br />about the proposed outlet discharge and thus granting an easement was declined <br />originally. The developer then re -designed the outlet without and easement. This revision <br />included a plunge pool dissipator and enlargement of the pond. However there were still <br />concerns regarding erosion and overland flow. Staff met with the Vickers on Thursday, <br />May 7, 2020 to review options for a stormwater outlet. The owners explained their <br />concerns over possible ditch erosion and ongoing maintenance concerns. Staff explained <br />that if an easement is obtained, the City will be responsible for ongoing maintenance of <br />the improvements including the outlet area. The owner informed staff of their <br />preference for a piped outlet with a dissipater still incorporated with the understanding <br />that it is city maintained. After further discussions with the Vickers, developer and City, <br />the final design includes a conventional outlet structure with discharge from Pond 100 to <br />the private ditch with rip rap armor and no plunge pool dissipator. The pond remained <br />oversized further reducing the rate of runoff from the site which is well below the <br />existing conditions. <br />A Permanent Drainage & Utility Easement agreement between the Vickers and the City <br />has been agreed too. The City will be responsible for stormwater maintenance within the <br />easement area. Great River Energy (GRE) has also approved the drainage easement and <br />storm pipe through their easement. <br />Phasing <br />The site will be mass graded in one (1) phase and developed in two (2) phases. Phase 1 <br />has 35 lots and Phase 2 has 33 lots. <br />Utilities <br />Public water, sanitary and storm sewer utilities will be installed within the development. <br />I <br />
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