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

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C1.5.1 Surface Water Quality The City Code the City's surface water management plan (Ramsey, 2018b) address management of surface water. The goal of the City's surface water management is to protect and improve the quality of existing surface water resources in and near the City and provide guidelines for current and future urban development. C1.5.2 Groundwater Quality The MDH has an ongoing program to monitor the quality of municipal water supplies. City of Ramsey municipal wells are sampled at least once every year for selected metals, other inorganic compounds, organic compounds, and bacteria as part of this program. 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 Act or by the State of Minnesota. These results are presented in the Ramsey Consumer Confidence Report that is prepared annually. A copy of the 2018 annual report is presented in Appendix D. The 2018 report and reports from other years can also be accessed on the City's website at http://www.ci.ramsey.mn.us/Archive.aspx?AMID=38 Reports from previous years are also available from the City upon request. The City currently adds chlorine and fluoride to the water supply at the pumphouses associated with the wells (Ramsey, 2018a). In addition, ortho and polyphosphates are also added to the pumped water at the pumphouses to inhibit corrosion and sequester iron and manganese. The City currently has four pumphouses in which water is treated prior to entering the distribution system. Water from the City's wells is routed to the pumphouses for treatment as follows: • Pumphouse 1 — water from Wells 1 and 2 • Pumphouse 2 — water from Wells 3 and 4 • Pumphouse 3 — water from Wells 5 and 6 • Pumphouse 4 — water from Wells 7 and 8 The City currently has the capacity to treat up to 11 MGD (Ramsey, 2018a). The MDH has prepared a study for Anoka County which evaluates the relative susceptibility of the water table aquifer to contamination from nitrate (MDH, 2012). The susceptibility of most of the area encompassed by the East DWSMA has been classified as low or moderate, although there are some small areas of high susceptibility within the DWSMA. In the West DWSMA the susceptibility classifications range from low to high. The combined area of low and moderate susceptibility is similar to the area of high susceptibility in the West DWSMA. The aquifer vulnerability classification for the Tunnel City-Wonewoc aquifer (the source water aquifer) suggests that it is unlikely that nitrate in the water table aquifer would adversely impact the source water aquifer in the DWSMAs. It's important to consider groundwater quality when determining management strategies for the land uses within the DWSMAs. Since the City currently enjoys good water quality, the City has developed management strategies in this WI-IPP amendment aimed at maintaining the groundwater quality in the source water aquifers. C-10