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<br />CHAPTER ONE <br />DATA ELEMENTS and ASSESSMENT (4720.5200) <br /> <br />PART 1. REQUIRED DATA ELEMENTS <br /> <br />A. Physical Environment Data Elements <br /> <br />1. Precipitation - Not considered directly because the aquifers exhibit confined <br />hydraulic conditions. <br /> <br />2. Geology - Interpreted from well records and regional studies. <br /> <br />3. Soils - Not considered because the aquifers exhibit confined hydraulic conditions. <br /> <br />4. Water resources - The Mississippi, Minnesota and St. Croix Rivers were used as <br />far-field boundaries to establish the regional flow field in this aquifer. <br /> <br />B. Land Use Data Elements <br /> <br />1. Land use - Not considered for the Part I wellhead protection activities. <br /> <br />2. Public utility services - City sanitary and storm sewers were not considered <br />potential sources of recharge to the drinking water aquifer because they are <br />hydraulically isolated from aquifers used by the city for a water supply. <br /> <br />C. Water Quantity Data Elements <br /> <br />1. Surface water quantity - Not considered a factor because the aquifers used by <br />the city wells exhibit confined hydraulic conditions. <br /> <br />2. Groundwater quantity - Review of groundwater appropriations permits in the <br />State Water Use Data System data base was performed to identify high capacity <br />wells in the area that might affect delineation of the wellhead protection area. <br /> <br />D. Water Quality Data Elements <br /> <br />1. Surface water quality - Not considered a factor because the aquifers used by the <br />city wells exhibit confmed hydraulic conditions. <br /> <br />2. Groundwater quality - Routine monitoring by the Public Water Supply Program <br />shows no contamination has been detected in samples from the city distribution <br />system. The city treats the raw water to add chlorine and fluoride before it is <br />pumped into the distribution system. <br /> <br />1 <br />