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2 <br />indicated transmissivity values of 15,000 ft/day for the Prairie du Chien aquifer. Using <br />the observed Prairie du Chien thickness of 102 feet at Well 2, hydraulic conductivity is <br />estimated to be 147 ft/day. <br /> An aquifer test plan was submitted to the MDH proposing the above values for use in the <br />amended plan delineations. Since there is uncertainty over how much the hydraulic <br />conductivity changes in the area, conductivity was varied by 50% in the model (both <br />increased and decreased) to account for the plausible range in values. <br />C. Quality and Quantity of Water Supplying the Public Water Supply Well - Water in the <br />City of Centerville water distribution system is regularly sampled and analyzed for <br />contaminants regulated under the federal Safe Drinking Water Act. Routine monitoring by the <br />Public Water Supply Program at MDH does not indicate contamination that may pose a public <br />health risk. No contaminants of significant concern have been detected in the City’s wells, <br />however the relatively high tritium concentration does indicate the Prairie du Chien aquifer <br />may have some vulnerability to contamination. <br />The Prairie du Chien and Jordan aquifers appears to have sufficient transmissivity and <br />recharge to remain a long-term source of drinking water for the residents of Centerville. No <br />additional wells are planned for Centerville over the next ten years, even though annual <br />increases in water demand are expected over this period to accommodate growth. Well 2 has <br />sufficient capacity to accommodate this increased growth. Monitoring of water levels within <br />the aquifer in the region will help observe the long-term sustainability of the aquifers as <br />surrounding communities continue to develop. Water level data collected in the Centerville <br />wells will contribute to the understanding of groundwater sustainability. <br />D. The Land Uses in the Drinking Water Supply Management Area – Land uses in the <br />DWSMA (Drinking Water Supply Management Area) for the Centerville wells is primarily <br />residential and commercial, with some open space and agricultural land uses. Land uses will <br />be discussed in greater detail in the amended Part 2 Wellhead Protection Plan, which will <br />include the contaminant source inventory for parcels within the DWSMA. <br />8 <br /> <br />