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ITEM 1_PowerPointWASTEWATER MASTER PLA WORK SESSION January 22nd, 2018 Presented by: Advanced Engineering and Environmental Services, Inc. (AE2S) OUTLINE 1/22/2018 03 70 5 ILAN 2012 pill West WWTF r East WWTF Current Population -3,700 -3,000 2017 Flow, MGD 0.34 0.29 Permitted Capacity, MGD 0.72 1.1/1.65 Future Population 29,200 30,800 Future Flow, MGD 3.9 4.1 1/22/2018 Aesthetics Public Safety Minimize Odor Potential Minimize Trucking Energy Efficiency Environmental Stewardship 1/22/2018 M 1/22/2018 POPULATION AND FLOW Current Population -3,700 -3,000 2017 Flow, MGD 0.34 0.29 Permitted Capacity, MGD 0.72 1.1/1.65 Future Population 29,200 30,800 Future Flow, MGD 3.9 4.1 2017 Housing Starts: 210 DISCHARGE West WWTF Limits East WWTF Limits BOD 15 mg/L* 15 mg/L* TSS 30 mg/L* 30 mg/L* pH 6.0-9.0 6.0-9.0 Ammonia -N 68 / 54 / 113 / 32 kg/day' 41/ 58 / 21/ 585 kg/day' Fecal Coliform 200 cfu/100 mL 200 cfu/100 mL Total Phosphorus ^'0.18 mg/L*1 ^'0.23 mg/L*1 Total Nitrogen Projected 3 to 5 mg/L Dissolved Oxygen 6.0 mg/L (min)' 6.0 mg/L (min)' Chloride 229 mg/L2 614 mg/L *Additional Load Limits; 'Seasonal Requirements; 2Anticipated variance REGULATORY 35.0 30.0 250 E -- 20.0 10 15.0 O u 100 5.0 ME LIMIT PROTECTIONS -EAST VJ WTF RESj, mglL TP (LakePepin TM ixj, rng�L 2.5 20 1.5 1.0 0.5 00 0.0 0 5,000 10,Op1 15,000 20,000 25,000 .._ 30.000 35.000 40.0011 45,ODD Papulation -G90Djoec-Mar), myjL -T55, mgA -pmmonia (fie[ -Mar), mZIL TP Uun3eP, 5ea.onEd 1/22/2018 REGULATORY LIMIT PROJECTIONS -WEST W WTF 35.9 1.6 39.9 1.4 1.2 25.9 � 1 E 29.9 E 9.8 0 15.0 m 0.6 z 19.9 :e 4 5.0 9.2 OA 0 3,466 6,500 9133 12$65 15,597 16,6W 21,662 24,694 27,721 30,759 33.791 36,624 39,656 A.i.T.tk -CBOO(D-Mat,ndL -7A, kgA-Ammme(AR- MM, rngA-TP9akePepin7MDL), gA • Regulatory Certainty Rule ■ Incentive for TN Reductions ■ Implement Full BNR — B.A.T. ■ No TN/TP Limits Reductions — 20 year ■ Implement until 2031 or TN/Nitrate River Nutrient Regions in Minnesota 1/22/2018 7 1/22/2018 • Capacity • Regulations • Age/Condition (016EQUENCE 4F FMLURE • Considered 13 Alternatives • Narrowed to 3 Alternatives $180.0 $159.9 $160.0 $140.0 $120.0 5Si $]00.0 $80.0 P$37.0 549.7 $60.0 $40.0 520.0� Sym 542.3 551.8 _ $0.0 OD MBR ■ WM CAPITAL M EAST CAPITAL O&M N PW • Considered 10 Alternatives • Narrowed to 3 Alternatives $IDD.0 y,l1.; 577.9 580.0 S70.0 ; 56D.0 ,10.r S50.0 540.0 5245 530.0 520.0 7 529. S1D.0 M,.3 .3 SD.O L Independent. iliosalids - Aerobic Consolidated Biosolids -Aerobic Cortsoli dated Bi osolids - Chemical Digestion Digestion (Lime) Stabilization ■ West Capital Cost ■ East Capital Cost O&M NPW 1/22/2018 0 • MBR • Restrictive effluent limits • Maintains familiar activated sludge approach • Combines clarification/filtration = small footprint • Lowest NPW • Consolidated Biosolids — Chem. Stabilization • Rural to urban conversion = landfilling • Use existing infrastructure; add new process • Small footprint • Class A = flexible • Lowest NPW MBR Liquid Treatment (East and West WWTFs) i ..p nary Tr, -i enl a�IRemanal I� Membrane 4 i penile Fllteis UV plsiMeNon EHluen[Aerat on pucharge Fmesteentl�nml �R Permeate Pumping t Mixed Uyuar Reryde W— SUP I' Sonet Prottuing • • • • Consolidate Solids Treatment: Dewatering and Chemical Stabilization at East WWTF WEST WA4 Drage O , 1 p rr ng mt gpmel EAST, __, Stabil®tmsy,tem m Wenn 1/22/2018 10 LE3€Np 1/22/2018 11 1/22/2018 12 1/22/2018 13 • Maintain Investment • Fix Before Failure • Asset Life ■ Concrete ■ Pipe ■ Equipment ■ Electrical/Computers . PAL- QNSEQUENCE OF FAILURE 1/22/2018 14 1/22/2018 15 1 East SCADA & Controls Rehabilitation[Repiacement - $150r000 2 East Prelim i nary Treatment Building Mechanical HVAC 1 $50,000 (Specific unit cast TBD) 3 East Effluent Sampler 1 $30,000 4 West Influent Sampler 1 $30,000 5 East Sludge Storage Tank No. 1 thru 4 Submersible Mixers 4 $40,000 6 East Drain Lift Station Pumps 2 $20,000 7 East Effluent Do Probe 1 $2,500 S East Preliminary Treatment Building Odor Control Unit 1 $100,000 9 West RAS Pumps 3 $30,000 10 West + Polymer Feed System 1 each $160,90U East 11 East Grit Equipment - Pump and Cyclone 1 $135,000 other West + East Post -Aeration Tank No, I Fine Bubble Diffusers; $315,000 East East Post -Aeration Blowers; West ftotary Screen; aggregate West Thickened Sludge Pump • Next Steps • Adopt Plan • Submit to MPCA — SRF eligibility • Annual Capital Review • Project Initiation • Design • Construction • Start -Up 1/22/2018 16 1/22/2018 17