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Table 6-3.Concept Level Costs for 28 MGD Conjunctive Use Surface WTP Expansion. <br /> Item Quantity Units Unit Cost Total Cost <br /> 28 MGD Surface WTP 1 Lump Sum $78 000 000 $78 000 000 <br /> Expansion ' <br /> 30" Raw Watermain (2nd) 7,500 Feet $450 $333757000 <br /> Road Crossing (2nd) 400 Feet $4,000 $136007000 <br /> Additional Wells 24 Each $135003000 $363000,000 <br /> Raw Watermain for Wells 321000 Feet $300 $9,6007000 <br /> Easements/ Land 4 Acres $100 000 $400 000 <br /> Acquisitions ' <br /> Environmental 6 Miles $501000 $300,000 <br /> Subtotal $129,300,000 <br /> Contingency (30%) $38,8003000 <br /> Eng/Admin/Legal (20%) $331600,000 <br /> Total $202,0009000 <br /> 6.7 Estimated Operation and Maintenance Costs <br /> Operation and maintenance (O&M) costs for major surface WTPs vary considerably with the types of <br /> unit processes and water quality characteristics. To develop O&M costs for Approach 3, O&M costs <br /> from Moorhead, Minnesota (a lime softening surface WTP), were used as the basis for this study and <br /> proportioned based on the size of the new surface WTPs. The costs include labor, chemicals, <br /> electricity, building costs, residuals handling and disposal, and administrative costs. <br /> Table 6-4.Annual Operation and Maintenance Costs for Conjunctive Use WTPs for Approach 3. <br /> Alternative Treatment Plant <br /> 11 O&M <br /> Approach 3—2040 Demands <br /> (7.8 MGD Water Provided)' <br /> $5,250,000 <br /> Approach 3— Ultimate Demands <br /> (29 MGD Water Provided)' $15,600,000 <br /> 1—Assumes that 80%of the water annually is provided from surface WTP. <br /> Page—30 1 METROPOLITAN COUNCIL <br />