Agenda - Council - 10/08/2019 - Laserfiche WebLink

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Additionally, the aquifer test will help determine specific capacity of the aquifer and any boundary conditions the aquifer may exhibit. This will provide information of well drawdown locally across the well fields and help make predictions for the wellfield given increased pumping rates and future aquifer drawdowns. SEH proposes to use the City of Ramsey groundwater model developed in the Part I Wellhead Protection Plan be utilized to model groundwater use and supply in the future. — We will use the groundwater model in order to model particle paths of water for times greater than the 10 years mapped in the Part I Wellhead Protection Plan. The current Wellhead Protection Plan is limited to looking at groundwater particle paths for the next 10 years using the existing municipal wells. SEH proposes looking at Particle paths beyond the 10-year period and update particle paths with any proposed well citing locations. We also propose reviewing how changes to the distribution system will affect the Drinking Water Supply Management area. SEH proposes looking at future drawdown and water supply changes in the TCW aquifer by utilizing the existing groundwater model. Future drawdown in the aquifer can be modeled by comparing current drawdown within the TCW aquifer with predicted future pumping schemes (i.e. increased pumping rates in the existing well field or by adding well fields). This comparison of drawdown may be useful in long- term viability of water intervals, proximity and water supply of the TCW. Analyze and provide recommendations on using alternative sources of water. If long-term aquifer limitations are established in the section above SEH will recommend steps Local and regional geology will be reviewed for potential aquifers other than the TCW such as the Mount Simon/Hinckley, or surface water. If long term aquifer limitations are established in the section above SEH will recommended steps — Review available geologic information established in section 1 for other potential aquifers. — Review location feasibility for other preferred aquifers. — Proposed test wells to be advanced to confirm geology. — Perform and analyses pump tests. • The memorandum will also provide recommendations for the need and/or benefit of introducing a surface water supply both now and into the future. Information from the North3west Metro Regional Surface Water Supply Study will be incorporated into this portion of the water supply analysis. Summarize Results SEH will develop a report and figures with the above information. 0 Develop Water Model The City has requested creation of a new water distribution system model. The goal of this effort is to use existing City GIS mapping and information as well as a copy of the City's existing model to create a new complete and functioning water system computer model. The construction of this model would include all of the major features of the existing Ramsey water system, with pipes, tanks, pumps and other water system components. We will calibrate the model with field data so that the operation of the model will reflect real world conditions of the water system. Upon completion of the model, the final product will be ready for use and reveal current operational capabilities, detect deficiencies and examine water system questions and concerns. We will develop a new computer model of the water distribution system using WaterCAD v8i. SEH maintains software licensing for all industry leading water system modeling software and is available to transition between software platforms as needed. We will work with existing city GIS data to import water infrastructure information into the proposed water system model. We will constrict the model on the same coordinate system as existing GIS data allowing for seamless export of model result data in GIS format as needed. This will also allow for simple updates in the future as system components are added or replaced. Additional capabilities of the completed model include but are not limited to: • Fire flow analyst ability to analyze fire flow and locate system deficiencies. • Planning: ability to identify future system deficiencies and recommend system improvements. • Development assessment: assess the impacts of system expansion and recommended water system improvements. • Operational management: analyze overall system operation and overall impact on system operation. 6 CENTRALIZED WATER TREATMENT FACILITY PROPOSAL