Agenda - Council Work Session - 10/20/2020 - Special

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14 Table 14— 50-Year Life Cycle Cost Summary Gravity Filter Water Treatment Plant Item Capital Project Costs -Year Life Cycle Cost 000 Annual Cost $1,950 000 $31,890 Equipment Replacement $9,680 000 $310 000 Labor $6,490 000 $110 000 Gas $1,180 000 $20 000 Chemicals $6,490 000 $110 000 Insurance $1,770 000 $30 000 Electricity $6,780 000 $120 000 Equipment Repair $7,080 000 $120 000 Total 50 Year Life Cycle Cost $71,360 000 Table 15 — 50-Year Life Cycle Cost Summary Pressure Filter Water Treatment Plant Item 0-Year Life Cycle Cost Annual Cost Capital Project Costs $30,280 000 $1,850,000 Equipment Replacement $13,990 000 $450000 _ . Labor $6,490 000 $110000 31 Gas $1,180 000 $20,000 Chemicals $6,490 000 $110,000 Insurance $590 000 $10,000 Electricity $6,190 000 $105,000 Equipment Repair $9,730 000 $165,000 Total 50 Tear Life Cycle Cost $74,940 000 Alternative Evaluation & Recommendation The two options for removing manganese from Ramsey's drinking water that have been evaluated include gravity filters and pressure filters. The capital cost of the pressure filter treatment plant is slightly less than the gravity filter treatment plant ($30.3 million versus $31.9 million). However, the life cycle cost of the pressure filter treatment plant is more than the gravity filter treatment plant ($74.9 million versus $71A million). The pressure filter treatment plant has a higher life cycle cost due to the expense of painting and maintaining the steel filters; whereas concrete gravity filters require very little maintenance. In addition to having lower life cycle costs, gravity filters have other advantages over pressure filters including: FEAS[BILITY STUDY -DRAFT RAMSY 154354 Page 38