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4.4 Surface Water Treatment <br /> To protect public health from pathogens, surface water used for drinking water is required to follow the <br /> Surface Water Treatment Rule. The Surface Water Treatment Rule and recommended treatment <br /> processes for a Northwest Metro surface WTP are included in Appendix D. <br /> 4.5 Estimate of Probable Capital Costs <br /> The following tables provide concept level capital costs for surface WTPs that would meet 2040 <br /> demands (25 MGD) and ultimate demands (75 MGD). The capital costs for a surface WTP that would <br /> meet ultimate demands is included to provide a planning horizon beyond 20 years. <br /> Table 4-2 provides a concept level cost estimate for a 25 MGD surface WTP. A layout for a 25 MGD <br /> lime softening surface WTP is included in Appendix E. It is assumed that 20 acres of land would be <br /> required to construct a 25 MGD surface WTP (includes room for expansion) plus easements for the raw <br /> water line and that the WTP is constructed in Ramsey. The difference in cost to construct the water <br /> treatment plant in Dayton would be negligible. Table 4-2 presents costs in 2020 dollars. <br /> Table 4-2.Concept Level Cost for 25 MGD Surface Water Treatment Plant. <br /> Item Quantity Units Unit Cost Total Cost <br /> 25 MGD Surface WTP 1 Lump Sum $73,000,000 $73,0007000 <br /> River Intake 1 Lump Sum $23000,000 $2,0003000 <br /> 48" Raw Watermain 71500 Feet $700 $5,2501000 <br /> Road Crossing 400 Feet $5,000 $210001000 <br /> Easements/ Land 20 Acres $100 000 $2 000 000 <br /> Acquisitions ' <br /> Environmental 2 Miles $50,000 $1007000 <br /> Subtotal $84,350,000 <br /> Contingency (30%) $25,000,000 <br /> Eng/Admin/Legal (20%) $22,700,000 <br /> Total $132,0003000 <br /> Table 4-3 provides a concept level cost estimate for a 50 MGD expansion of the 25 MGD surface WTP <br /> to bring the capacity to 75 MGD. Although it is presented as one large expansion, it is likely that the <br /> expansion would take place over multiple steps. It is assumed that a second raw water line and road <br /> crossing would be required. Table 4-3 presents costs in 2020 dollars. <br /> Table 4-3.Concept Level Cost for 50 MGD Surface Water Treatment Plant Expansion. <br /> r Item Quantity Units Unit Cost Total Cost <br /> 150 MGD Surface WTP <br /> Ex 1 Lump Sum $98,000,000 $98,000,000 <br /> s Expansion <br /> ir48" Raw Watermain (2nd) 71500 Feet $700 $5,2507000 <br /> Road Crossing (2nd) 400 Feet $51000 $270007000 <br /> Environmental 2 Miles $50,000 $1007000 <br /> Subtotal $105,350,000 <br /> Contingency (30%) $31,600,000 <br /> Eng/Admin/Legal (20%) $27,400,000 <br /> Total $16430009000 <br /> Page—23 1 METROPOLITAN COUNCIL <br />