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2. INTRODUCTION <br /> <br />2.1 Authorization <br /> <br />The St. Anthony City Council authorized WSB & Associates, Inc. to study the available <br />options to address 1,4-Dioxane (Dioxane) that has been detected in the City’s water <br />supply and provide a long term, reliable source of potable water that meets all the <br />recommended State and Federal health guidelines. This Feasibility Report summarizes <br />these options. <br /> <br />2.2 City Standards and Objectives <br /> <br />The City of St. Anthony Village has the following Standards and Objectives as they <br />relate to providing drinking water for its residents and customers: <br /> <br />1. Provide safe, reliable, and high quality drinking water for its residents and customers <br />2. Provide adequate quantities of water for fire protection and maximum day demands <br />3. Provide a robust drinking water system that can withstand the test of time <br />4. Be environmentally responsive <br />5. Be fiscally responsible <br />6. Maintain its own destiny and control <br /> <br />2.3 Study Scope <br /> <br />This r eport summarizes five options that were selected to address Dioxane in the City’s <br />drinking water: <br /> <br />• Option 1 – Blend the existing wells; <br />• Option 2 – Construct deeper Mount -Simon Hinckley wells; <br />• Option 3 – Purchase water from Minneapolis Water; <br />• Option 4 – Purchase water from St. Paul Regional Water; and <br />• Option 5 – Implement treatment to remove Dioxane. <br /> <br />2.4 Background <br /> <br />Trichloroethylene (TCE) has been detected in the City’s water supply since the 1980’s <br />and this contaminant is currently being treated at the City’s water treatment plant. <br />Dioxane testing in St. Anthony wells first occurred in March of 2015 by the Minnesota <br />Department of Health. This testing was initiated in response to the presence of Dioxane <br />at levels higher than the Health R isk Limit (HRL) in nearby municipal supply wells. <br /> <br />This testing indicated that Dioxane is currently present in the City’s three drinking water <br />wells. In addition to the MDH testing, the City has been testing for Dioxane monthly <br />since March of 2015. The results of the Dioxane tests are shown in Table 1. <br /> <br /> <br />56