12/10/2025 PZ Combined Packet - Laserfiche WebLink

Home Search

Ms. Katie Larsen 12/03/2025 Page 3 Existing - Peltier 24.29 51.03 116.82 N/A Proposed - Peltier 17.01 32.70 69.28 N/A Existing-South 9.71 20.08 44.23 N/A Proposed - South 3.58 10.87 28.46 N/A Existing - North 2.96 6.02 9.30 N/A Proposed - North 1.40 3.54 6.47 N/A Comments: 1. This development falls within the CSMP area and as such is beholden to additional rate control and volume reduction requirements. These volume reductions are demonstrated for flows to/through Wetland 4. As the CSMP is intended to limit flooding concerns on Peltier Lake and the entire site drains there, all peak outflows must be limited to 0.1 cfs/acre. With the total site size of 125 acres, the maximum total outflow in the 100-year event is 12.5 cfs. Hill (11/10/2025) RCWD, Hill and City Staff have coordinated as requested. WSB (12/3/2025) Noted. More detailed comments below outline additional efforts that can be made to control flows per the CSMP. 2. Stormwater flows must route to the trunk system passing through the site. a. A sluice gate must be added at the manifold structure (101) of the trunk system for CSMP operations. WSB (12/3/2025) Design must be included in future submittals. 3. Modeling should include a “gate closed” condition where no outflows occur to Peltier Lake during flood stages. 100-year event HWLs must be analyzed in this condition as controlling elevations for freeboard to proposed structures. WSB (12/3/2025) Remains an open comment, snowmelt modeling does not include “gate closed” condition with no outflows. This should be included as a standalone model. 4. An additional requirement for development within the CSMP is provision of more detailed water quality/reuse calculations. Please provide existing and proposed TP/TSS loading calculations for the proposed BMPs, including stormwater reuse. Additionally, please request a copy of the Reuse Design Worksheet from RCWD to quantify potential reuse volumes. Hill (11/10/2025) Requested data are included with the enclosed stormwater management report. WSB (12/3/2025) Reported values are P8 inputs, not outputs. For ease of review, please include native P8 model files with future submittals. 5. Confirm ACD 72 flow capacity allowances with RCWD. WSB (12/3/2025) Remains an open comment. 6. Provide profile plans of proposed storm sewer, including utility crossings, for more detailed review and comment. Hill (11/10/2025) Profiles will be provided with final plans. WSB (12/3/2025) Noted, remains an open comment. Peltier Ponds Development - Engineering Review