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Ms. Rachel Juba December 1, 2022 Page 2 S:\Users\R_Juba\DEVELOPMENT PROJECTS\Oneka Prairie\Preliminary Plat\Engineers Memo and Red-lined Comments\LTR-r juba-Oneka Prairie Preliminary Plat - 120122.docx Utility Plan 6. As identified in the City’s Comprehensive Water Supply and Distribution Plan, a 12” trunk watermain will need to be extended north from the existing 12” trunk watermain located within Oneka Parkway with the City of Hugo paying for oversizing costs. 7. The City’s Comprehensive Sanitary Sewer Plan identifies the way in which properties are to be served by sanitary sewer. A trunk sanitary sewer lift station serving this development and a significant area to the north and west is identified to be constructed near the existing terminus of Oneka Parkway and will be paid for and constructed by the City of Hugo. Sighting of the lift station has been coordinated with the developer and the lift station will be located in the NW corner of the development with access coming from Oneka Parkway. 8. Sanitary Sewer within Fairoaks Avenue is available to serve a small portion of the property based on its current depth but, is not of sufficient depth to serve the developable area to the east nor the majority of the subject property. Staff has determined that it is more effective to serve the majority of the development from the lift station. Two lots at the extension of Fairoaks will be served by the sewer within Fairoaks, allowing earlier building permits and certificate of occupancy considering the lift station will not be operational as quickly as this gravity main. 9. The project is not proposed to be phased. Stormwater Management 10. The site is proposing to meet water quality requirements through the use of onsite water reuse for irrigation and filtration basins. The basins are properly sized to provide the required water quality volume. Additional calculations are needed to confirm how long the stormwater basins are able to sustain the irrigation demand in times of draught. 11. The site is proposing to meet rate control requirements through the use of onsite stormwater ponds. There are several inconsistencies between the plans and the HydroCAD modeling. Rate control requirements will be confirmed once the modeling has been updated. 12. While there is not FEMA floodplain onsite, there is RCWD regulated floodplain over a portion of the site. Compensatory storage calculations for all fill below the RCWD regulated floodplain have been provided showing no impact on the floodplain. 13. Several proposed buildings onsite do not currently meet the City’s freeboard requirement for low floor separation. This was a previous comment and low floors on these lots will need to be modified to meet these requirements. 14. A map showing the proposed irrigation area should be submitted. Elevation information for the intake lines for the water reuse systems has been provided but the location of these should be included on the plans. 15. Additional information is needed to confirm wetland hydrology impacts. Additional information on the comments concerning wetlands are included below. 16. Additional comments on the stormwater management and drainage have been provided to the applicant and should be addressed as the project moves forward.