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excellent removal of contaminants accomplished by these filters, ultra -filtration is <br />the recommended method of treatment. <br />Ultra -filtration processes utilize a pressure driven membrane process to remove <br />contaminants and disinfect the surface water. Pretreatment of the water is <br />accomplished utilizing ultra -violet disinfection. Prior to discharging to the <br />distribution system, chlorine is added for residual disinfection. <br />D. ALTERNATIVE COMPARISONS <br />Table 5.1 provides a summary of the cost of the two supply and treatment alternatives. <br />TABLE 5.1 <br />CITY OF RAMSEY <br />ALTERNATIVE COMPARISON WATER SUPPLY AND TREATMENT <br />Alternative No. 1 <br />Groundwater <br />Supply <br />Alternative No. 2 <br />Surface Water <br />Supply <br />1. Construct Well #6 <br />$820,000 <br />$820,000 <br />2. Construct Well #7 <br />$1,080,000 <br />$1,080,000 <br />3. Construct Well #8 <br />$790,000 <br />$790,000 <br />4. Construct Groundwater Treatment Plant <br />$14,000,000 <br />NA <br />5. Construct Surface Water Treatment Plant <br />NA <br />$18,500,000 <br />6. Construct Wells 9 —15 <br />$5,600,000 <br />NA <br />Total Construction Cost <br />$22,290,000 <br />$21,190,000 <br />1. Well No. 6 construction includes well, well pump, interconnecting piping to Well <br />House #3, electrical and controls. <br />2. Well No. 7 construction includes well, well pump, electrical and controls. Cost <br />also includes a temporary meter station/well house, and piping to the water <br />treatment facility. <br />3. Well No. 8 construction includes well, well pump, electrical and controls. Cost <br />also includes a meter station/well house. <br />City of Ramsey, Minnesota — M21.34343 Page 5-4 <br />Water System Study Prepared by Bolton & Menk, Inc. <br />