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FIRM OVERVIEW AND BACKGROUND <br /> t. . e ' 0- i ' ' Honouliuli Wastewater Treatment Plant <br /> ` - "' Effluent Disinfection Project <br /> k-( ( ',` x is t. ''';, #;,'-'„ CITY AND COUNTY OF HONOLULU,DEPARTMENT OF ENVIRONMENTAL SERVICES, <br /> rr I .s', c' '4` _ EWA BEACH,HAWAII <br /> �. -,''x. <br /> 4 :` r , . • t` •, ` Client Reference: <br /> . R' . Mr.Wesley Yokoyama,Chief,Wastewater Engineering and Construction, <br /> City and County of Honolulu <br /> 808.768.8790 / wyokoyama@honolulu.gov <br /> The current NPDES permit for Honolulu's Honouliuli Wastewater Initial planning efforts will evaluate alternative disinfection <br /> Treatment Plant requires a compliance schedule for enterococci technologies and consider how new treatment processes currently <br /> monitoring and a determination as to if proposed discharge limits under design and construction at the plant may affect technology <br /> can be achieved without disinfection.Effluent sampling and related selection.Additional sampling,testing,and laboratory studies are <br /> studies conducted by the City in 2019 indicated exceedances of also anticipated. <br /> o <br /> final enterococcus limits,concluded that disinfection is necessary o <br /> to comply with the new limits,and authorized proceeding with the The design will be coordinated with other major capital projects at the <br /> effluent disinfection project. WWTP relative to facility siting,power and other utility requirements, o <br /> as well as plant tie-ins.Specific coordination is required for the D <br /> Summary of Scope ongoing Headworks,Pump Station,Energy Savings,Solids Process a <br /> Upgrades,and Miscellaneous Improvements,and Secondary <br /> Carollo was selected to provide the engineering planning and design Treatment projects.Constructability and the sequence of construction z <br /> services associated with project implementation to achieve permit activities will also need to be carefully evaluated. z <br /> compliance by June 30,2030.The new facilities will be designed m <br /> with the flexibility to handle an average,maximum month flow of 50- Project highlights include: <br /> mgd and peak hour flows as high as 122-mgd.System hydraulics will K <br /> ■ New 50-mgd average/122-mgd peak disinfection facility. m <br /> be a key consideration to effectively integrate the new disinfection Z <br /> system into the existing hydraulic profile of the plant and deep ocean • Close coordination with other major design and <br /> outfall.Sea level rise resulting from climate change will be a factor in construction projects. o <br /> m <br /> the hydraulic analysis.Improvements to the existing outfall structure • Complex hydraulics and construction sequencing. o <br /> at the plant may be needed. D <br /> ■ Compliance schedule-driven. <br /> U) <br /> m <br /> G_ <br /> C) <br /> m <br /> U) <br /> +— _ m <br /> Pr .-"'-1l�^= <br /> iv <br /> w <br /> I A <br /> I <br /> \140, . 1" i., 1 `'Ir , 2 .u' ,` The Honouliuli WWTP UV disinfection <br /> o <br /> ` r 1i , system will accommodate a range of 0 <br /> ilk flows.The design and construction z <br /> I "` _- . -- of this project requires close < <br /> IG ice.: <br /> c r' -4 -- coordination with other ongoing D <br /> k t ' • = construction projects. z <br /> if Imo ?poi' ' L s - __ K <br /> i ?w a ..ro C 1 tit,^w " m <br /> D <br /> 0 <br /> D <br /> m <br /> D <br /> O <br /> z <br /> CAROLLO / QUALIFICATIONS /JUNE 2023 11 <br /> B:\Pursuits\Client831HON)\HawaiiCounty\EnvMgmtDept\On-Call FY23-24\Qual0623\PL.4 CmntyPing_Cmnty\Indd\01_FirmOverview_PL4 <br />