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