09/10/2025 PZ Combined Packet - Laserfiche WebLink

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Ms. Katie Larsen 09/03/2025 Page 3 8.WSB Response (9/3/25) – Block 1 lot elevations must maintain 2’ of freeboard to the pond 100-yr HWL of 905.55. Lots 1 and 2 do not have sufficient vertical separation with basement elevations of 907.0 and 907.5. 9.Provide additional easement for utilities outside the right of way a.Easements need to meet a 1:1 slope with the invert of the utility with a minimum of 20' centered on the easement 10.Swales should be shown to occur along side property lines •Stormwater Management Stormwater management for the Erickson Property site consists of a sedimentation basin to provide treatment. Existing and proposed discharge rates are summarized below. Pre- and Post- Development Discharge Rates (cfs) Condition2-Year10-Year100-Year10-Day Snowmelt Only needed if Existing9.6415.2332.09 basins landlocked Currently Only needed if 4.316.4612.40 Proposedbasins landlocked Comments: 1.This development falls within the Northeast Drainage Area Comprehensive Stormwater Management Plan (CSMP) area and as such is beholden to additional rate control and volume reduction requirements. Landform Response (8/11/25) – Proposed outlet structure has been re-routed to the existing south pond (Pond 500). See updated plans & stormwater report. 2.The pond south of this development was constructed with the Watermark development and designed to include runoff from the Erickson Property. If rates are reduced or maintained from existing conditions, volume control provided in the form of stormwater reuse, and water quality treatment provided by the proposed pond, it is recommended to overflow the onsite pond south to the existing Pond 500 (NWL 899, HWL 904.3). This allows the proposed development to meet CSMP rate control requirements by utilizing the existing Watermark system that already meets requirements. Landform Response (8/11/25) – Proposed outlet structure has been re-routed to the existing south pond (Pond 500). See updated plans & stormwater report. 3.Why does PB-3 have water surface land cover modeled in HydroCAD? Landform Response (8/11/25) – This should have been Type D soils. Updated. 4.The pond EOF must include riprap stabilization. Landform Response (8/11/25) – Updated. See Plans. 5.The modeled pond EOF of 906.5 does not reflect the EOF of 905.57 in the plans. Landform Response (8/11/25) – Model has been updated with an EOF of 905.57. 6.A detail must be provided for the pond outlet control structure. Landform Response (8/11/25) – Plan and profiles have been included. WSB Response (9/3/25) – The pond skimmer structure must include the rim elevation and must match the grate modeled in HydroCAD. The submerged 12” pipe Erickson Property Development - Engineering Review