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2020-09-09 CC Packet
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2020-09-09 CC Packet
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have been modified in the model to reflect current conditions. Table 3 shows the <br />modeled rates of these high capacity wells. High capacity wells beyond two miles retain <br />the original pumping rates assigned to them in the Metropolitan Council’s 2014 <br />modeling effort. Well usage is also addressed in Part 2 of this chapter. <br />Water Quantity Data Elements <br />Surface water quantity– The Minnesota River and Mississippi River are the major <br />discharge features located within the domain of the model developed for this project. <br />Numerous smaller discharge features havebeen added to the model domain and are <br />explained in greater detail in the Metropolitan Council’s technical report for the <br />Metropolitan Model (May 2014). <br />Groundwater quantity- Review of groundwater appropriations permits in the State <br />Water Use Data System ( <br />SWUDS) databasewas performed to identify high capacity <br />wells in the area that might affect delineation of the wellhead protection area. Most high <br />capacity wells as of 2014 were includedin the Metropolitan Council’s model. High <br />capacity wells within two miles of the Centerville wells were updated in the model for <br />the purposes ofthis delineation effort and are listed in Table 3. The City of Centerville <br /> we modeled at the rate outlinedin the wellhead protection <br />rules, based onhistorical or projected within with 5 yearsof the current date. Modeled <br />Centerville wellrates are shown in Table 2. <br />Water Quality Data Elements <br />Surface water quality– Major surface water features in the area, such as the Minnesota <br />River and Mississippi River, which are in direct hydraulic connection with the Prairie <br />du Chien and Jordan aquifers, serve as flow boundaries within select layers of the <br />Metropolitan Model. The Prairie du Chien and Jordan aquifers are also in connection <br />with more localized streams and lakes, as documented in the Met Council model report <br />(May 2014). Since these major rivers are points of drainage fromthe aquifers, the <br />quality ofwater in these rivers does not playa large role in Centerville’s water quality. <br />More pertinent is the quality of stormwater that infiltrates into the capture zones forthe <br />City’s wells. Surface water quality will be addressed in greater detail in the updated Part <br />2 plan. <br />Groundwater quality– Results ofroutine monitoring ofthe Centerville wells are <br />contained within the files ofthe MinnesotaDepartment of Health. Historical monitoring <br />has shown that the water qualitywithin the Jordan aquifer in Centerville is generally of <br />excellent quality. Nitrates levels in Centerville’s wells remain low(less than 1.0 mg/L), <br />indicating that nitrates-contaminants from turf fertilization is not impacting groundwater <br />quality. <br />Sampling of tritiumhas taken place at Centerville Wells 1 and 2. Tritiumis an isotope <br />ofhydrogen that was released into the atmosphere during the above-ground testing of <br />nuclear weapons in the early 1950s. While harmless, the presence of tritiumin aquifers <br />indicates that someportion ofthe water was in contact with the atmosphere within the <br />past 60 years. A tritiumlevel of1 tritiumunit (TU) or greater is an indication that these <br />aquifers are somewhat vulnerable to contamination. The tritiumlevels range between <br />non-detection (<0.8 TU) in Well 1 to 2.6 TU in Well 2. <br />6 <br /> <br />
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