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MEMORANDUM Rice Creek Commons Water Distribution System Modeling Results Update January, 2025 Page 2 H:\KIMLEYHO_PR\0T4133552000\2_Preliminary\C_Reports\Preliminary Design Report Update\Report Update\Water Preliminary Engineering Analysis\Memo-Rice Creek Commons Water Distrib Sys Modeling Results Update Final Draft 01.24.2025.docx City of Arden Hills water distribution system model was received and updated based on recent construction projects using Infowater Pro. Previous analysis reports that are referenced in this update report are provided in Appendix D. The purpose of this technical memorandum is to present and discuss the findings of the water distribution modeling performed to predict and analyze the adequacy of the water distribution in Arden Hills, particularly its extension into the proposed TCAAP site redevelopment area. The software program WaterCad V8i was used to develop the distribution model. Information obtained from Arden Hills provided the pipe sizing and locations, pumping facilities and water storage facilities making up the City’s existing distribution system. Historical water usage data were also provided by Arden Hills and the City of Roseville. This information was used to estimate demand data to be input into the model. Model Development A meeting was held between the City of Arden Hills, Bolton & Menk, and the previous water model consultant to discuss the state of the water model.The consensus was that the model was up to date, except for two recent improvement projects. The distribution system layout, pipe size, demands, and pump controls are considered up to date. The recent watermain improvements along Hamline Ave N and the improvements along Old Highway 10 (Old Snelling Ave) were implemented into the updated model for this study. The inherited water model had an average daily demand (ADD) of 1.0 million gallons per day (MGD) and maximum daily demand (MDD) of 2.5 MGD for the existing 2024 distribution system of Arden Hills, these demands are based on the revised demands in the 2019 Water Distribution System report and model analysis by AE2S. This equates to a peaking factor of 2.5 between ADD and MDD. Based on the latest development planning for the TCAAP/RCC project, the total demand for the proposed site will be 0.565 MGD at ADD. Using the 2.5 peaking factor, the MDD for TCAAP/RCC is 1.412 MGD. Peak hour demands are estimated at six times the ADD and are only used for sizing watermain, it is not used for sizing of storage reservoirs. Peak hour demands are not typically used in modeling analysis since these flows do not occur for extended periods of time, maximum day demand flows plus fire flow are typically used to simulate peak flow of a system. The information provided was used to develop the system layout, locations of storage facilities and booster station. Following the construction of the layout and system facilities, demands were calculated and imposed on the modeled system. The data provided by Arden Hills and Roseville was used to develop the average day water demand (ADD) and the maximum day water demand (MDD) to be used in the model. Metered data from the City of Roseville from the years 2004 through 2011 indicated ADD’s ranging from 1.10 to 1.27 million gallons (MG) per day. A higher-end value of 1.25 MG per day was selected as the ADD for the existing system. To allow for a little future growth within the existing developed area of Arden Hills, the average day demand used for the model was increased to 1.5 MG per day (a 20% increase). The amount of increase for future growth will be further considered as part of final design, and may potentially be reduced. A factor of three times the average day demand was used to develop the maximum day demand resulting in a demand of 4.5 MG per day. A peak hour demand multiplier was also used to determine the peak hour water usage for the model. The peak hour demand factor was two times the maximum day demand, or six times the ADD. Kimley-Horn has