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Ms. Katie Larsen 11/6/2024 Page 3 Spargur Estates Engineering Review (Plowe 10/15//24) Noted (WSB 11/6/24) Complete •The highpoint on the east side at the front of Lot 4 would become the secondary EOF for the existing basin to the east when inundated. (Plowe 10/15//24) Noted (WSB 11/6/24) Previous 908.7 EOF acted as a secondary EOF for the adjacent developments to the east and west and must be maintained (Basin to the east is 'land-locked' and will ultimately flow back to the west). 1 Areas along the side property line can be filled to improve drainage swales but the 908.7 EOF must be maintained 2 Adjacent grading should be contained to drainage and utility easements 3 Grading on adjacent property must be coordinated and approved by the adjacent property owner 4 Provide written documentation to the City prior to construction •(WSB 11/6/24) The Lowest Opening Elevation (LOE) of Lots 2 and 3 must be at least 910.7 to maintain minimum freeboard with the EOF (908.7) 1 The Lowest Floor elevation must be a minimum 909.4 (SELO) •Stormwater Management Stormwater management for the site consists of a small read yard depression. However, based on site layout, stormwater management is not required under City ordinance. Comments on the proposed stormwater design are offered below. Pre- and Post- Development Discharge Rates (cfs) Condition 2-Year 10-Year 100-Year 10-Day Snowmelt Existing 0.62 1.70 4.17 Not required Proposed 1.27 2.80 6.43 Not required Comments: 1.There are minor increases in site runoff rates due to the new impervious. However, as stormwater management requirements are not triggered, these increases are not regulated. Runoff to the north and south will be captured by storm sewer routing to City ponds. (Plowe 10/15//24) Noted. (WSB 11/6/24) Complete 2.Sufficient freeboard is available between the depression modeled HWL and the proposed household low floors/low entries.