Item 1. Drinking Water UpdatesOtsego Council Work Session - Drinking Water UpdatesJanuary 20241Council Work Session: Drinking Water UpdatesPresented by: Advanced Engineering and Environmental Services, LLC (AE2S)January 2024Outline•Hydrogeologic Study Results•Water Demand Update Results•Alternatives Considered and Recommendation•Phasing / Capacity Expansion Implementation•Next Steps – South Central WTP Siting•Additional Drinking Water Updates12Item 1.
Otsego Council Work Session - Drinking Water UpdatesJanuary 20242Total Probable Cost $238.7 $261.1 $305.5Opinion of Total Project Cost - Summary of Alternatives (2024 Million$)ItemAlternative 1: Dispersed SystemAlternative 2: Two Large WTPsAlternative 3: Surface Water WTPStart with the Answer (2024$)•Implement South Central WTP by 2028•Continue with WH4 WTP and pursing WH3 WTP Funding Central Wellfield Study •Challenges to address: capacity, iron, manganese, radium•Recommended in 2020 Drinking Water Master Plan•Changes – Restrictions on Mt. Simon Aquifer, Rapid Growth,Blending Water Options34
Otsego Council Work Session - Drinking Water UpdatesJanuary 20243Hydrogeological Study Summary•Needed Capacity in NW & Central Wellfield – 8,000 gpm•Cannot be achieved•Significant well interference•Could potentially support 3,900 to 5,700 gpm, but field work needed to confirm•Moved forward with Phasing Alternative development/analysisto help inform the next Hydro-Geo investigationHistoric/Projected Water Demands •The 2020 projections were refined to align with 2023 Comp Plan•2023: 6.74 MGD max day; analyzing other categories; range of 112 to 117 GPCD56
Otsego Council Work Session - Drinking Water UpdatesJanuary 20244Alternatives: Pros/ConsAlternative 1: Dispersed Treatment•Less adaptable to changing regulations•Limited space for WTPs near existing wells•Dispersed operations, potentially more parcels requiredCons •Reduced raw watermain needs•Allows phasing of implementation•Flexible operations •Highest use of existing infrastructure •Spreads out the wellfields (important for TCW)ProsAlternative 2: Two Larger WTPs•Increased raw watermain needs•Larger finished watermain requirementsCons •More adaptable to changing regulations•WTP siting is flexible•Consolidated operations •Lowest O&M cost (incremental)ProsAlternative 3: Surface Water Treatment•Significantly higher O&M to operate a lime softening WTP•Increase training of staff and overall staffing•Larger finished watermain requirements•Intermittent operation of WTPs at WH3 and WH4 Cons •Less wells results in reduced raw watermain costs •Surface water is considered a more sustainable water supply•Consolidated operations •Provides softened water•Decreases chlorides sent to WWTFsProsAlternatives Cost Comparison (2024 Dollars) Wells $30.4 $35.9 $0.0Decomission Wells / Pump Houses$0.0 $0.6 $1.2Surface Water Intake / Collector Wells$0.0 $0.0 $13.8Raw Watermain $18.3 $27.4 $13.5Water Supply Subtotal $48.7 $63.8 $28.5Finished Watermain $43.7 $69.3 $73.1Storage$33.1$33.1$33.1Booster Station $5.5 $5.5 $5.5PRV $1.7 $2.1 $1.7Distribution System Subtotal $84.1 $110.0 $113.5Treatment $105.9 $87.3 $163.5Treatment Subtotal $105.9 $87.3 $163.5Total Probable Cost $238.7 $261.1 $305.5Opinion of Total Project Cost - Summary of Alternatives (2024 Million$)ItemAlternative 1: Dispersed SystemAlternative 2: Two Large WTPsAlternative 3: Surface Water WTP78
Otsego Council Work Session - Drinking Water UpdatesJanuary 20245Alternative 1 – Dispersed Treatment (recommended)When to Implement? “Soft” Redundancy of East and West Separately910
Otsego Council Work Session - Drinking Water UpdatesJanuary 20246South Central WTP Timeline Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4WellsSCWTPWellsTest Well Agreements PurchasesPipelinesEasementsSCWTPPurchase NegotiationsTest WellsDesignBiddingConstructionStartupRoute SelectionDesignBiddingConstructionStartupPilotingDesignPre-ProcurementAs neededBiddingConstructionStartupSRF/Fed State? SRF/Fed State? "Irrigation Season" 2028SCWTP Funding DevelopmentRaw Water PipelinesWellsProperty AcquisitionSitingYearActivityHydrogeo AnalysisWTP Detailed Needs2025 2026 2027 20282024Schedule1 2 3 4 5 6 7 8 9 10 11 12 1 2 3Scoping/ContractingSCWTP Site AlternativesDesktop (initial)TW Data AnalysisDesktop (refinement)Test Well Bid Package and BiddingWells - RecommendationSCWTP - RecommendationActivityHydrogeo AnalysisTest Well Construction / TestingSitingYear20242025Test Well - Land Negotiation ProcessSC Wellfield StudyWTP Detailed NeedsConveyance Costs / CIP Refine1112
Otsego Council Work Session - Drinking Water UpdatesJanuary 20247South Central WTP Siting Study: Scope Highlights•Sufficient preliminary process engineering to develop WTP footprint requirements and utility service needs to rank site preferences•Robust hydrogeologic investigation (desktop, data collection, field observation, and refinement)•CIP refinement based upon findings •Funding support •Outcomes: •Determine wellfield development spacing requirements•Identify recommended parcels to enter negotiations with landownersSouth Central WTP Siting Focus AreaSCWTP Zone1314
Otsego Council Work Session - Drinking Water UpdatesJanuary 20248SCWTP Siting Study: Updated Fee Estimate PhaseWTP Needs Development $ 16,000 South Central WTP Site Alternatives $ 24,900 Hydrogeologic Evaluation (Desktop) $ 67,000 Test Well Bid Package and Bidding $ 25,700 Conveyance Cost Development and CIP Refinement $ 5,900 Hydrogeologic Evaluation (Field Work) $ 36,500 Project Management $ 19,600 Other scope items* $ 7,700 Total $ 203,300 *Does not include Lobbying supportOther Updates•WH4 Design•Piloting complete•At 60% design; bid package ready for EPA/MDH by end of February•EPA coordination for grant funding•Well 10 – Installed•Well 11 – Installation progressing•East-West Interconnect – Anticipated to be operational by Spring 20241516
Otsego Council Work Session - Drinking Water UpdatesJanuary 20249NEXT STEPS•Master Plan Amendment – Incorporate input from this meeting•Council adoption of amendment •South Central WTP Siting Study •WH3 WTP Design (2025 or federal funded for 2024) •Evaluate conservation rate structure (additional rate tier)QUESTIONS?Otsego Drinking Water Updates1718