08/12/2020 P&Z Packet - Laserfiche WebLink

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Ms. Katie Larsen 08/05/2020 Page 3 WOLD 7/11/2020: The is a delegated design item and this information will not be ready for review until this work scope is awarded to the subcontractor. The retaining wall engineering delegated design is a shop drawing requirement per the project specifications. WEIS 7/27/20: Engineering drawings for the retaining walls will be provided. The applicant has included the impervious surface area of the Hodgson turn lanes in the storm water calculations. However, they have not addressed how stormwater will be managed. There is no storm sewer system or ditch system shown, the applicant will need to coordinate the drainage plan with Anoka County also. Turn lane construction plans will be required with the final plat. This is being developed by SEH along with the details of the road design and will be provided as soon as possible. (AJA 2020-05.08) Preliminary grading of the turn lanes shall be included in with preliminary plat submittals. SEE ATTACHED PRELIMINARY GRADING DESIGN SUBMITTED BY SEH. Applicant shall review existing TOPO shots and update existing contours. Currently, the existing contours show a 10-ft hill on the west side of the intersection of Gateway and the private road. This hill does not exist. WOLD 7/11/2020: Loucks has been requested to return to the site to review the area in question. Loucks found some "bad shots" and will update the survey. • Stormwater Management The Lyngblomsten development is 20.74 acres in size, with an existing impervious area of approximately 2 acres. Majority of the site runoff is towards the west where there is an 24 inch diameter pipe outlet and to the existing wetland on site. The proposed impervious area is approximately 9.5 acres. There is a proposed pond located in the middle and east side of the site. The City adopts Rice Creek Watershed District's (RCWD) rules for water quality and quantity requirements. The applicant is proposing a stormwater reuse system that will be further reviewed with the final design. The Gurrent submittal now inGludes rate Gentrol via a combination of a dFy pond (leGated on the northwest) and a stormwater treatment pond. The submittal normal wateF level of the pond is 896, and the 100 year elevation of the p nd is of onn G CAPROC frArn ROOD has hoon nhfo•npd io io 2020_05W Lyngblomsten Preliminary Plat Engineering Review