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

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C1.6.2.3 Daily Volume of Water Pumped Daily volume of water pumped from each of Ramsey' municipal wells used in the groundwater flow model was determined by using the highest recorded annual volume for each well (see MDH, 2018). C1.6.2.4 Flow Boundaries The primary flow boundaries for the Tunnel City-Wonewoc aquifer in the Ramsey area are the Mississippi River and the Rum River. In addition to the rivers, operating high capacity wells can influence groundwater flow directions on a local scale. The rivers, along with active high capacity wells, were included in the groundwater model used for the WHPA delineation. C1.6.2.5 Groundwater Flow Field The groundwater flow model shows groundwater flow toward the regional discharge zone at the Mississippi River as well as some flow towards the Rum River. C1.6.3 Quantity and Quality of Water Supplying the Public Water Supply Wells As discussed above, the Ramsey municipal wells are open to a bedrock aquifer consisting of the Tunnel City Group and the Wonewoc Sandstone. Construction details for the Ramsey municipal wells are summarized in Table C-1 . Based on the available information, there are no known groundwater quantity issues that will have any significant impact on the management of the DWSMAs associated with the Ramsey wells. In the future, new high capacity wells completed in the source water aquifer in the vicinity of Ramsey could, potentially, affect the quantity of groundwater available if the volume of water pumped from the aquifer would exceed the rate at which the aquifer recharged. It is also possible that new high capacity wells in the source water aquifer within the DWSMAs may have some effect on pumping from the City's wells, if the new wells were to be installed close to the City's wells. Currently, there are no known significant conflicts or interferences related to the municipal wells in the DWSMAs. It is possible that the DWSMA could expand in the future if Ramsey installs additional wells in the source water aquifer, particularly if new wells would be in a new well field. Any new wells constructed within the 10-year life time of this Plan will be incorporated, as directed by the MDH, into the groundwater model and, if projected pumping from the new wells affects the boundaries of the DWSMAs, Plan amendments will be prepared with the help of the Wellhead Protection Consultant. As discussed above, the City participates in the MDH's ongoing program to monitor the quality of municipal water supplies. To date, reported concentrations of all monitoring parameters meet the regulatory levels specified by the U.S. EPA as part of the Safe Drinking Water. Results of these analyses are available upon request from MDH or the City. C1.6.4 Land and Groundwater Uses in the DWSMA Aquifer vulnerability within the DWSMAs is classified as Moderate. Based on the aquifer vulnerability classification, the potential for land uses within the DWSMAs to negatively impact the source water C-12