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o Although the concentrations are less than the MCL, Minneapolis’ water contains higher levels of disinfection byproducts (Haloacetic Acids, Total Trihalomethanes, etc.) than the water distributed by the City of St. Anthony Village. o Minneapolis’ water is supplied from surface water, meaning the influent water quality has potential to fluctuate throughout the course of a year. In the spring time during snowmelt and in the summer time during algae blooms, the water quality within the Mississippi River can produce higher levels of taste and odor compounds. 5. The potential exists for hazardous materials to spill into the Mississippi River, either from tanker trucks, rail cars, storm sewers or other sources along the river. 6. The age and redundancy of the Minneapolis Water distribution system is of concern. The utility contains hundreds of miles of old steel pipe that is yet to be lined or replaced. These maintenance costs may increase the future cost of Minneapolis Water. 7. Minneapolis Water most likely has concerns with the long term reliability of the Mississippi River as its water source. They are currently considering implementing back-up groundwater wells for its surface water supply. In the event o f a historic drought or an intentional or unintentional contamination event, the utility would likely not have enough backup capacity in their groundwater wells to continue to serve all of its customers. 8. The City’s existing water rates would increase. The City would need to collect enough revenue from water users in the City to cover the cost of purchasing water from Minneapolis Water as well as to maintain its own existing water distribution system (such as the water tower, watermains, hydrants, meters) within the City. 9. At least two watermain connect ions, two booster stations, and 20-inch watermain would need to be constructed across St. Anthony Village to provide redundancy in case one of the watermains broke or required maintenance. 10. The City would spend in excess of $17 million over 20 years to purchase water from Minneapolis Water. Estimated Capital and Long Term O&M Costs Estimated capital and long term O&M costs were based on present worth analysis on the assumption that a new 20-inch watermain would need to be installed from two of the potential connection points defined by Minneapolis Water to the existing St. Anthony Village water tower, running approximately 15,000-feet in length. Due to the difference in the hydraulic grade lines (ground elevation plus water pressure) between the two water distribution systems, two booster pump stations would be required 1,4-DIOXANE PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. 3183-00 PAGE 11