Laserfiche WebLink
Table 5-3 provides a concept level cost estimate for a 50 MGD expansion of the 25 MGD lime softening <br /> groundwater treatment plant to bring the capacity to 75 MGD. Although it is presented as one large <br /> expansion, it is likely that the expansion would take place over multiple steps. Table 5-3 presents costs <br /> in 2020 dollars. <br /> Table 5-3.Concept Level Cost for 50 MGD Lime Softening Groundwater Treatment Plant Expansion. <br /> Item Quantity Units Unit Cost Total Cost <br /> 50 MGD Lime Softening Lump <br /> Groundwater WTP 1 $90,000,000 $90,0003000 <br /> p <br /> Ex ansion Sum <br /> New Wells 44 Each $13500,000 $66,000,000 <br /> Raw Watermain 585000 Feet $300 $171400,000 <br /> Easements/ Land 7 Acres $100 000 $700 000 <br /> Acquisitions ' <br /> Environmental 11 Miles $50,000 $5507000 <br /> Subtotal $17456509000 <br /> Contingency (30%) $52,4001000 <br /> Eng/Admin/Legal (20%) $45,4003000 <br /> Total $27250009000 <br /> 5.7 Estimated Operation and Maintenance Costs <br /> O&M costs for the lime softening groundwater treatment plants were estimated based on pumping <br /> costs, chemicals, labor, residuals handling and disposal, and maintenance expenses. <br /> Table 5-4.Annual O&M Costs for Lime Softening Groundwater Treatment Plants. <br /> Alternative <br /> Treatment Plant <br /> O&M <br /> 2040 Demands � <br /> MGD WaterAnnual Avera a) $5,500,000 <br /> (7.8 g <br /> Ultimate Demands <br /> MGD Water Annual Avera $16,400,000 <br /> (29 e)g <br /> 5.8 Implementation Considerations <br /> To provide the groundwater necessary to supply the four Northwest Metro communities would require <br /> approximately 66 wells. Having 66 wells in one community could cause unsustainable aquifer <br /> drawdown. This would need to be evaluated further before constructing a regional groundwater <br /> treatment plant. <br /> Page—27 1 METROPOLITAN COUNCIL <br />