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HomeMy WebLinkAboutCOM 0400.001 2022-2024Mitchell A Roth Ramzi I. Mansour Mayor Director Lee Lord Wai, ;0 Brenda lokepa-Moses Managing Director Deputy Director County of Hawai®i DEPARTMENT OF ENVIRONMENTAL MANAGEMENT 345 Kekdando'a Street, Suite 41 - Hilo, Hawaii 96720 - cohdem@hawaiicounty.gov Ph: (808) 961-8083 - Fax: (808) 961-8086 August 29, 2023 MEMORANDUM TO: Heather Kimball, Council Chair and Members of the Hawaii County Council FROM: Ranizi I. Mansour, Director Department of Environmental Manageme on regarding RE: Communication No. 400: Request for presen 1the Puna Wastewater Facility Plan and the Pdhoa Wastewater Feasibility Study Attached is a copy of AECOM's presentation relating to the Puna Wastewater Facility Plan and the Pahoa Wastewater Feasibility Study. Please distribute copies for the September 5, 2023, meeting of the Communications, Reports, and Council Oversight Committee. Hawai'i County is an Equal Opportunity Provider and Employer Comm. N Ref. To: a September 5, 2023 Delivering a better world �L=COM aecom.com Agenda 1. Project areas 2. Overview of collection, treatment, disposal methods 3. Summary of wastewater management alternatives 4. Evaluation criteria • Cost • Affordability 5. County Council feedback on criteria 2 aecom.com Project Area: Pahoa Feasibility Study o 3 Pahoa Project Area Boundaries Legend —Major Roads Roads Census designated Place (CDP) Boundary Pahoa CDP Land Use Pattern Allocation Guide (LUPAG) Zones Low Density Urban Medium Density Urban Urban Expansion Pahoa LUPAG Pahoa Project Area N 0 o.zs M ®Mlles eaecom.com Project Area: Puna Facility Plan KURTtSTOWH tat�b9`K MOUNTAIN VIEW GLENWOOD VOLCANO 4 KEA'AU \ HAWAIIAN \\1` PARADISE PARK ORCHIDLAIID ESTATES O 'AIIJALOA PAHOA HAWAIIAN BEACHES PARKS ANDSHORES MAKU'U • NANAWALE ESTATES H,3r'y A32 3,p t)LEILAIII ESTATES KAIMU! �tiQ,r 3 POIH$KAU r S Project Area Communities Legend •oject Area - Major Roads Other Roads Village Centers © Regional Q Community • Neighborhood Future Location Subject to Community Review A 0 25 5 Miles eaecom.com Overview of Collection,, Treatment., Disposal Methods Overview of Collection Methods • Conventional Gravity Sewers • Low Pressure Sewers • Cross-country gravity sewers in easements • Pump stations �'lip r IIt l a aI, 6 aecom.com Overview of Treatment Methods • Individual Wastewater Systems (IWS) • Decentralized Treatment System • Centralized Treatment System 7 Hilo Wastewater Treatment Plant eaecom.com Overview of Disposal Methods • Effluent Disposal • Land Application • Recycled Water • Hilo WWTP Ocean Outfall • Solids Disposal • Biosolids • Landfill 8 eaecom.com 9 aecom.com Puna Wastewater Management Alternatives All IWS and Decentralized Treatment Decentralized On -Site Treatment and LPS 4 Subregional Treatment Plants - Urban Sewering (6.0 mgd) 3 Subregional Treatment Plants - Urban Sewering (6.0 mgd) 1 Regional Treatment Plant - Urban Sewering (6.0 mgd) 1 Regional Treatment Plant - Full Flow Sewering (8.5 mgd) Flow to Hilo WWTP - Urban Sewering (11.0 mgd) Flow to Hilo WWTP - Full Flow Sewering (13.5 mgd) Decentra Centralized IWS in IWS in Urban Full Flow Alternative Sewer Neighborhood lized Treatment Unsewered Sewered Sewering Sewering Options Regional PS PS Treatment Areas Areas (mgd) (mgd) ✓ ✓ ✓ N/A N/A ✓ N/A 8.5 LPS Gravity ✓ ✓ ✓ ✓ 6.0 N/A Gravity & LPS ✓ Cross Country ✓ ✓ Gravity ✓ ✓ ✓ ✓ 6.0 N/A Gravity & LPS ✓ Cross Country ✓ ✓ Gravity ✓ ✓ ✓ ✓ 6.0 N/A Gravity & LPS ✓ Cross Country ✓ ✓ Gravity ✓ ✓ ✓ N/A 8.5 Gravity & LPS ✓ Cross Country ✓ ✓ Gravity ✓ ✓ ✓ ✓ 6.0 + 5.0 N/A Gravity & LPS ✓ Cross Country ✓ ✓ Gravity ✓ ✓ ✓ N/A 8.5 + 5.0 Gravity & LPS ✓ Cross Country ✓ ✓ Onsite 10 aecom.com Puna Wastewater Management Alternatives ®®� --"'� AHernative TA: All IWS or Danralizee Systems 0 weien Area — eatls O2Q20 Census Tren Ahensarive t � � Enae�p OSOS - o wl FVLrc � u�� Pessnmi Peekepe o-: • � ' • PMne Lae.uen 'J` 2p53 i bns or Te x PP�rry /` SOS \n4: 5Miks Pacific Ocean wwe: w'nn na...aPSen err -as. m. aeu wrtnen a pro area. <o snv.. �' Alternative 1A: All IWS or Decentralized Systems 11 boyhood YN Fat:mated ity of AlSematire 1 B: Deualizerl Package I Plank and LIPS W OPrged Mee Rpaes NeleM1aereeetl W WTPs tapaeiry IBPd1 s5.00y 25A0a 9 • 50.00p • ]SAOa Ipp pap /� � • 1]c 0ya /// \ ■ s5a 00a ■ Z. ppp ■ z5o,a5o ce' LPS wayq lyekaIly be ins4lley Premsvily ab�p neipM1bo ways. N xn'p be A cerco m�me w+enai �tapa svwTPs- e 25 5 Meer Pacific Ocean rxn I Alternative 1 B: Both Decentralized On -Site Treatment and LPS aecom.com Puna Wastewater Management Alternatives Roads Wastewater 1Infrastructure Trunk J Subrectional WWTP o ze sM.i'r FCb Alternative 2: 4 Subregional Treatment Plants — Urban Sewering (6.0 mgd) 12 s EL. B1•a'°"•I'z+'Mr' Alternallve 3 - tee' 3-plant Sabreglnne I E;. na zeuo an A e- FbwO Y3 MGD PBf.Ylc Ocean Urban Sewennq s a nelwwrP [Dpro]ecl Area r/roaae a/n. EL. aoa Esema es 2oe2 n.spn - Roads AvB_ Flaw i of MGO Wastewater Infrastructure vaoaa.o ••� wwrr _ community EL. z�ao Branch Sewers Es9mso[9 ZOS2 bespn ag. F w, o es uob —Force Main Trunk I . . Inleroeplor Subreglonal O wwTP r, e e.5 SMllvs Alternative 3: 3 Subregional Treatment Plants — Urban Sewering (6.0 mgd) eaecom.com Puna Wastewater Management Alternatives s�er<9bna wwry Alternative 4 - Ke•LU EL. UrhI9G'-Plet R al E.tvn.ted 2052 Gespn alln 5 e910r1 —� Avp. FlowaRlGo PdLrflG iiGddlt ¢wvvin9 't ❑ Prgeat Area — Roatls 2s' •8" Ikoposed V/astewater Irll-trecttrre ComnunRy &anrr, I —sewers — Farces Malt Think llnterceptd ® Regional WWTP I Y— ry Mix Alternative 4: 1 Regional Treatment Plant — Urban Sewering (6.0 mgd) 13 a.h­n wvrra Aft.—twe 5 - N•a.u. EL, — 1pl.. lZe w a•sgn Severing Wlth Ar9. Flax p 5 RIGo Full FIOW Pacific Ocean O Prgetl Area Roads PraVaseU Infrastructure na co—lWay&a d, — sewers j — Face Main �• T—k I Interceptor Inl¢rCEpinr wvvTp f 1q. 5— vg I2. y A SMiks Alternative 5: 1 Regional Treatment Plant — Full Flow Sewering (8.5 mgd) eaecom.com Puna Wastewater Management Alternatives Hib NNfFP Alternative 6 - Prllw Urban S-nng Flow to H to WNfP Pacifie Ocean Q Project Area — Roads ns' Hilo VMnrTP Proposed Wastewater Infrastn cture Community M Branch Sewers �a. — Trunk 1 Intercepto — Force Main PSNorg s IMerr�pta ry a zs sraa. t Alternative 6: Flow to Hilo WWTP — Urban Sewering (6.0 mgd) 14 Hib yWy p Se Puna Fuillde FFlow Ai wenng � Flow to Hilo WWTP FaciBc Ocean Q Rgeq Area Ra.& ® Hilo VYWTP Proposed Wastewater Infrastructure _ Community Branch Sewers .x" — Trunk /Intercepto — Force Main �, ■ W'PS AImg e Interceptor < a— rz. An a 3.5 5 Micas Alternative 7: Flow to Hilo WWTP — Full Flow Sewering (8.5 mgd) eaecom.com Pahoa Wastewater Management Alternatives Wastewatejj=Tr,e,,Tt! Decentralized Centralized IWS Average Flow Treatment Treatment All IWS and Decentralized ✓ ✓ N/A Treatment Both Decentralized On- ✓ 0.3 mgd Site Treatment and LPS Pahoa WWTP with All Conventional Gravity ✓ 0.3 mgd Sewers Pahoa WWTP with Both Conventional ✓ 0.3 mgd Gravity Sewers and LPS 15 Alternative Regional Neighborhood Sewer Options PS PS N/A LPS Gravity Sewers ✓ ✓ Gravity & LPS ✓ Onsite Water Reuse and Land Application aecom.com Pahoa Wastewater Management Alternatives ��� Pottage PIanI 'Serving Mauka Makvu •a .` • • " Epstirg Puna Kai • • 9noMrig center • r Treatment System current Estimate of OSDS 1Pro' ed OSDS n 2OSY 390 609 Alternative IA: AI•.I IWS or OerEmral¢etl Systems • ti � r'• . f' r •j •• S•r • .•6. •p'I s s o nm•a> ane.n,n.e IA amuna osos �� Pmentisi Furore osos Pmun<�a P•G•p, Pont Luadmns 2052P eleetie sml me �� osos:. Lmcmtimns mr pmrMa� rmw.m osos. •..aa.�.y asaan,a arouam mroreptrrc•. gsgs: mns�svw.ge tlispn•I rysum A Alternative 1A: All IWS or Decentralized Systems 16 Estimated QuantRy of Nei hhorhood WIMPS 50,000 1 12g,000 ] 130,1100 1 Total 3 Total Capacity 0.3 m Pa ge Plant Serving Mauka Maku'u Capadty (gpd) wtemaTrvn 1B: Degenhalrzed Package Hants nd LPS Q Prcw A- ----- koaos Potential Package WviTP Loudon C.PaL1[y WPM • 50,000 ■ 12l) 000 13[) 000 rc.- LPs wmwa ryp•cay Oa insW �etl pninPr�M •bny n.pnen,n4ma ro•ew.y... wn.rc prmp..rym• w�ei n. •.w.r.a mr m. pmr,nu.i p.c4e, WWTPs, 0 oa ozs Alternative 1 B: Both Decentralized On -Site Treatment and LPS eaecom.com Pa ge Plant Serving Mauka Maku'u Capadty (gpd) wtemaTrvn 1B: Degenhalrzed Package Hants nd LPS Q Prcw A- ----- koaos Potential Package WviTP Loudon C.PaL1[y WPM • 50,000 ■ 12l) 000 13[) 000 rc.- LPs wmwa ryp•cay Oa insW �etl pninPr�M •bny n.pnen,n4ma ro•ew.y... wn.rc prmp..rym• w�ei n. •.w.r.a mr m. pmr,nu.i p.c4e, WWTPs, 0 oa ozs Alternative 1 B: Both Decentralized On -Site Treatment and LPS eaecom.com Pahoa Wastewater Management Alternatives Pahoa Alternative 2A Gravity Sewer Project Area — Roads Proposed 4", r1 WastewetH Infrastructure g— 8' G—AY 12' Gravity Force Main , + Neighbvhwd % Pump Station e°N4 Regi—1 Purnp R v Station Wastewater Treaunent Plant 0 Or15 615 Mikf Alternative 2A: Pahoa WWTP w/AII Conventional Gravity Sewers 17 PAAOa Altarnative 2B Gravity Sewer and LPS OProjao Area — Roads Proposed Wastewater InFrasvuctura B' Gravity 12' Gravity 3 LPS Ro — Force Alain Regional Pump ai. Station 44R`y a A Alternative 213: Pahoa WWTP w/both Conventional Gravity Sewers and LPS eaecom.com « f ^ . ok}\ 41 ^ . � !\I /� :. .y .r� .�� . ~ � a. �~ . . .. . . . ... . . . . . 1 . � y \ � � � ± «i < � � 1 © 2 aec o com Evaluation Criteria • Estimated Construction Cost — Cost of the capital improvement, including labor and materials as well as indirect costs to design and construct the wastewater WW system; constructability (ease or efficiency that the facility can be built) which makes it more economical; construction implementation schedule. • Estimated Annual O&M Cost — Annual cost of labor, consumables, and energy • Operational Ease and Maintainability — Ease with which the wastewater system can be kept functioning in a safe and reliable manner; operator availability; level of skills needed to operate and maintain systems; ease and/or speed that a system can be restored to operation after failure occurs; probability that a successful repair action can be performed within the allowable time schedule; user accountability; impact on the larger community. • Flexibility to meet Potential Future Requirements — Ability to adeptly meet wastewater regulations including treatment levels and effluent disposal/use; sustainable solids handling strategy; ability to meet future demands and future water quality requirements (e.g. Act 248 application and recycled water directives) • Utilization and Acquisition of Land — Site acquisition; site layout efficiency; availability of county land; ability to obtain easements for collection system; impact on land use during construction; ease in meeting security requirements to prevent unauthorized entry and vandalism • Environmental/Permitting — Difficulty in permitting the project for construction; implications for the design and construction; ability to mitigate impacts such as odor and vector control. 19 a aecom.com Summary of Estimated Costs - Puna Facility Plan Capital Cost Net Present Value Residual Value (Remaining Value Total LCC Alternative No. Description p ( Construction and of Operation and p of Equipment andMaterials) (Realized at End of Installation Costs) Maintenance Cost System's Life) 1A All IWS or Decentralized Systems $2.81B $2.21B (-$1.3B) $3.71B 113 Both Decentralized On -Site Treatment and Low $4.01B $2.81B (-$1.9B) $5.01B Pressure Sewer 2 4 Subregional Plants - Urban Sewering (6.0 mgd) $7.71B to $8.71B $0.71B to $1.01B (-$4.1B to-$4.6B) $4.61B to $5.01B 3 3 Subregional Plants - Urban Sewering (6.0 mgd) $7.91B to $9.01B $0.71B to $1.01B (-$4.2B to-$4.8B) $4.71B to $5.11B 4 1 Regional Plant - Urban Sewering (6.0 mgd) $8.71B to $9.71B $0.71B to $1.01B (-$4.6B to-$5.2B) $5.11B to $5.51B 5 1 Regional Plant - Full Flow (8.5 mgd) $9.21B to $10.21B $0.81B to $1.11B (-$4.9B to $5.51B) $5.41B to $5.81B 6 Flow to Hilo WWTP - Urban Sewering (11 mgd) $9.81B to $10.81B $0.91B to $1.11B (-$5.3B to $5.81B) $5.71B to $6.11B 7 Flow to Hilo WWTP - Full Flow (13.5 mgd) $10.51B to $11.51B $1.01B to $1.31B (-$5.6B to $6.21B) $6.11B to $6.51B Costs shown in 2023 dollars. Costs for alternatives 2 through 7 are summarized over their A, B, and C versions for different collection systems. Note that lowest/highest capital cost does not necessarily coincide with lowest/highest O&M or residual cost. aecom.com - LCC: life cycle cost calculated by Capital Cost + Operation and Maintenance - Residual Value 20 Summary of Estimated Costs - Pahoa Feasibility Study Capital Cost Residual Value Total LCC Alternative No. and Construction Description Operation and (Remaining Value p ( (Realized at End of Maintenance Cost of Equipment and Installation Costs) System's Life) Materials) 1A All IWS or Decentralized Systems $81M $64M (-$37M) $109M 113 Both Decentralized On -Site Treatment and Low $90M $64M (-$41M) $114M Pressure Sewer 2A Pahoa WWTP with All Conventional Gravity Sewers $174M $41M (-$88M) $126M 2B Pahoa WWTP with Both Conventional Gravity $140M $49M Sewers and Low Pressure Sewers (-$69M) $119M - Costs shown in 2023 dollars. - LCC: life cycle cost calculated by Capital Cost + Operation and Maintenance — Residual Value 21 ej aecom.com Affordability • EPA's affordability criteria • 2% of median household income (MHl) for VWV services 1 Based on 2021 Census M H I. 2 In 2023 dollars, using 2% criteria of the 2021 MHI and adjusted for inflation. 22 ej aecom.com Gap Between Costs and Affordability Countywid Monthly Costs Pahoa Alt 1A Pahoa Alt 1B Pahoa Alt 2A Pahoa Alt 2B Affordable Monthly Rate $ 101 No Debt Service $ 116 $ 117 $ 118 $ 121 With Debt Service (no Grant) $ 235 $ 250 $ 210 $ 190 With Debt Service and 80% Grant $ 140 $ 146 $ 135 $ 135 Monthly $ 145 $ 145 $ 125 $ 137 Sewer Fee PAYGO with 80% Grant Monthly PAYGO Fee (10 $ 145 $ 145 $ 125 $ 137 Years) eaecom.com Gap Between Costs and Affordability Countywide Monthly Costs Puna Alt 1A Puna Alt 7 Approximate Affordable Monthly Rate $ 122 No Debt Service $ 112 $ 117 With Debt Service (no Grant) $ 460 $ 2.1150 With Debt Service and 80% Grant $ 194 $ 507 With Debt Service Connection Fee and 80% Grant Monthly Sewer Fee $ 165 $ 460 One-time Connection Fee $ 10,000 $ 10,000 With Debt Service PAYGO with 80% Grant MonthlySewer Fee $ 134 $ 621 Monthly PAYGO Fee (10 Years) $ 134 $ 621 eaecom.com Community Financial Capability • Rate structures • No debt service • With debt service (no grant) • With debt service and 80% grant • Connection fee • PAYG O • Additional revenue sources • Pumping septic tanks • High -strength and Industrial WW Surcharges • Rate differentials for in -town and outside town or flat base rate plus volumetric charge • Customer service charges: connection fees, late payment penalty, account activation fees 25 ej aecom.com Additional Factors for Evaluation Criteria • Estimated Construction Cost • Estimated Annual O&M Cost • Operational Ease and Maintainability • Flexibility to meet Potential Future Requirements • Utilization and Acquisition of Land • Environmental/Permitting • Additional factors: • Lava zone • Cesspool prioritization 26 ej aecom.com o � .� - i R TAR r+ V vj w ti gv � V ry -y�' {t'� py� l t M �n rtjj .. — A 1. �MZV`Cv f r i ffY n) R 27 aecom.com Impact of Lava Zones a� MOUNTAIN VIEW GLENWOOD VOLCANO TISTOWN 1\ KEA AU • HAWAIIAN PARADISE PARK O ORCHIDLAN6 ESTATES 0 AIIJALOA PAHOA M HAWAIIAN BEACHES PARKS AND SHORES MAKU'U • uANAWALE MESTATES Highway t72 KAP ►1d LEILANI ESTATES ,yti � ro� KAIMUI r }e POIHIKAU`1`A �r Project Area Communities Project Area — Major Roads Other Roads Volcano Lava Zones Lava Zone 1 Lava Zone 2 Lava Zone 3 Village Centers (D Regional Q Community • Neighborhood Future Location Subject to Community Review A P 25 5 Miles eaecom.com Impact of Lava Zones • Estimated capital costs reduced by approximately $2B if no public sewers or centralized WWTP in Zones 1 and 2 Capital Cost Net Present Value Residual Value (Remaining Value Total LCC Alternative No. Description p ( Construction and of Operation and p of Equipment andMaterials) (Realized at End of Installation Costs) Maintenance Cost System's Life) 2 4 Subregional Plants - Urban Sewering (6.0 mgd) $5.81B to $6.51B $0.51B to $0.71B (-$3.1B to-$3.5B) $3.31B to $3.61B 3 3 Subregional Plants - Urban Sewering (6.0 mgd) $5.81B to $6.51B $0.513 to $0.71B (-$3.1B to-$3.5B) $3.31B to $3.61B 4 1 Regional Plant - Urban Sewering (6.0 mgd) $6.61B to $7.31B $0.51B to $0.71B (-$3.6B to-$3.9B) $3.81B to $4.01B 5 1 Regional Plant - Full Flow (8.5 mgd) $7.41B to $7.81B $0.51B to $1.01B (-$3.9B to $4.21B) $4.1B to $4.51B 6 Flow to Hilo WWTP - Urban Sewering (11 mgd) $7.71B to $8.41B $0.61B to $0.81B (-$4.1B to $4.51B) $4.31B to $4.61B 7 Flow to Hilo WWTP - Full Flow (13.5 mgd) $8.31B to $9.01B $0.71B to $0.91B (-$4.5B to $4.91B) $4.71B to $5.01B eaecom.com Basis of Cost Estimates (cont.) ,//1/ 9949 .. Avg ostf�, CCH Aala Drive FM 9-30-2019 8" 612 $2,170,000 $7,300,000 $4,500,000 2.07 $7,353 CCH Ahuimanu FM 4-6-2017 16" — 24" 3,657 $7,700,000 $9,570,000 $8,800,000 1.14 $2,406 CCH Dowsett Nuuanu 2-28-2018 8" — 24" 6,575 $21,260,000 $44,300,000 $32,600,000 1.53 $4,958 CCH Dowsett Pali 3-2-2018 12" — 18" 9,763 $41,560,000 $52,850,000 $48,200,000 1.16 $4,937 CCH Kahanahou FM 4-13-2017 12" — 24" 4,733 $14,700,000 $21,800,000 $18,400,000 1.25 $3,888 COH DWS Paukaa 1-12-2017 6" 680 $318,350 $653,500 $492,390 1.55 $724 COH DWS Santos Lane 6-16-2016 6" 2,956 $648,555 $1,168,560 $926,706 1.43 $314 COH Lono Kona 1-29-2018 8" 6,744 $7,728,427 $10,726,943 $9,009,168 1.17 $1,336 COH Lanihau FM 4-9-2020 8" 677 $990,700 $2,403,424 $1,611,473 1.63 $2,380 COH Kaloko Heights 2021 8" — 12" 12,115 $8,753,520 Unknown $10,204,137 1.17*Low Bid $842 COH Lono Kona Rebid 3-29-2018 8" 6,386 $8,522,630 Unknown $9,934,984 1.17*Low Bid $1,556 * Cost at Bid Time Not Escalated to 2023 dollars 30 � aecom.com Basis of Cost Estimates (cont.) =Pipe Size (in.7)1 2 Estimated Construction Cost (EscalateALo 2023 $$) 11 $300 Basis Prorate by 2/6 3 $450 Prorate by 3/6 4 $600 Prorate by 4/6 6 $900 From Paukaa 8 $1,600 From Lono Kona 10 $2,650 Avg between 8 & 12 12 $3,700 Avg between 8 & 16 14 $4,750 Avg between 12 & 16 16 $5,800 From Dowsett - Nuuanu 18 $6,525 Prorate by 18/16 20 $7,250 Prorate by 20/16 24 $8,700 Prorate by 24/16 30 $10,875 Prorate by 30/16 36 $13,050 Prorate by 36/16 31 aecom.com Basis of Cost Estimates (cont.) Use recent data (8-10 years or newer) from local projects (COH and CCH) - Available data for piping: • COH: 6 and 8 inch sizes • CCH: Up to 24 inch (not much info >16 inch) Limited "greenfield" WWPS (two projects 1 @ 150 gpm and 1 @ 6mgd) New "greenfield" WWTP lacking for capacity > 100,000 gpd COH Cost Factors: • Not many large contractors (bonding > $20 million) — less competition • Shipping costs and material delivery • Rural project setting (less rigorous traffic control and utility relocations) CCH Cost Factors: • More large-scale contractors (bonding > $20 million) — more competition • Lower shipping costs and material delivery • Urban project setting (more rigorous traffic control and utility relocations) 32 aecom.com m M CV N CD 30 o 0 a) 20 L'L LL Cn Q O 10 Q) EA E cn 0 W Pahoa 1.23 mgd HPP 3.18 mgd (4 plant) 4 plant 3 ant 1 plant {6 mgd 1 plant f8.5 mod Keaau 0.93 mgd Pahoa $20M HPP $65M Keaau $72M Keaau $90M Volcano 0.65 mgd HPP $48M Keaau S16M Total S72M Total S90M HPP 4.41 mgd (3 plant). Keaau $16M Volcano $12M Keaau 6.0 mgd (1 plant) Valcano$12M Total $93M Keaau 8.5 mgd (1 plant full flow) Total $96M Volcano 0.65 mgd @ S17.9/gal = $11.6 say $12M I I Kea'au 0.93 mgd @ S16.S/gal = $15.3M say $16M Pahoa 1.23 mgd @ $15.8/gal = $19.4 say $20M f HPP 3.18 mgd @ $14.91gal = $47.3M say S48M - -� HPP 4.41 mgd @ $14.6/gal = S64.4M say S65M Kea'au 6.0 mgd @ S12.1Jgal = S72.6M say S72M �- 1 mgd - $1 fugal 10mgd =S Kea 'au 8.5 mgd @ $10.6/gal = S90.1 M say S90M 0 1 2 3 4 5 6 Flow (mgd) 10.2Jgal 7 g 9 10 Pahoa 1.23 mgd HPP 3.18 mgd (4 plant) Keaau 0.93 mgd Volcano 0.65 mgd HPP 4.41 mgd (3 plant). Keaau 6.0 mgd (1 plant) Keaau 8.5 mgd (1 plant full flow) eaecom.com Estimated Costs: Example Breakdown with Alternative 1 A • Year 2052::,stimatecl 30,625 IWS and estimated 22 decentralized treatment plants • 20% contingency and 20% project services • Estimated total capital cost of $2.813 TOTAL DESCRIPTION QUAN UN DIRECT UNIT Alternative 1A COST COST IWS + Decentralized Treatment Homeowner: IWS incl. septic Subtotal of Estimated Construction Cost $1,929,900,000 Contingency 20% $385,980,000 Total Estimated Project Cost $2,315,880,000 Project services 20% S463,176,000 TOTAL CAPITAL COST tank &leach field with new soil 30,625 EA 60,000 $1,837,500,000 (Cluster treatment plant (15,000 - 50,000 gpd) for commercial land schools, assuming avg. 25,000 gpd. 22 EA 4,200,000 $92,400,00 34 e aecom.com • COH Financing Alternatives • Bonds • Grants • Homeowners • EDA • Private/mortgage loans • USBR • Grants • EPA Technical Assistance • CWSRF • USDA • Commercial property assessed • CDBG financing program • Build Back Better Act • HDOH Cesspool Compliance Pilot • Loans grant program • SRF • WIFIA • Special Improvement Financing • New sources of revenue • Pumping septic tanks • High -strength and Industrial WW Surcharges • Rate differentials for in -town and outside town or flat base rate plus volumetric charge • Customer service charges: connection fees, late payment penalty, account activation fees 35 ej aecom.com