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FIRM OVERVIEW AND BACKGROUND
<br /> , I. ei _ Honouliuli Wastewater Treatment
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<br /> ;. ‘. �, ,r . Plant Effluent Disinfection Project
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<br /> ..... C ''C o' .r* - , ,,1 7,-1' CITY AND COUNTY OF HONOLULU,DEPARTMENT OF ENVIRONMENTAL SERVICES,
<br />,` ,.. , I., .. 'or •.:. EWA BEACH,HAWAII
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<br /> ' . le 1/P • ( 11 Client Reference:
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<br /> Mr.Wesley Yokoyama,Chief,Wastewater Engineering and Construction,
<br /> . . r,'° :;•12,e« ` • c €,m° • City and County of Honolulu
<br /> 808.768.8790 / wyokoyama@honolulu.gov
<br /> The current NPDES permit for Honolulu's Honouliuli Wastewater
<br /> Treatment Plant requires a compliance schedule for enterococci Project Highlights
<br /> monitoring and a determination as to if proposed discharge • New 50-mgd average/122-mgd
<br /> limits can be achieved without disinfection.Effluent sampling peak disinfection facility.
<br /> and related studies conducted by the City in 2019 indicated
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<br /> exceedances of final enterococcus limits,concluded that Close coordination with other major
<br /> disinfection is necessary to comply with the new limits,and design and construction projects.
<br /> authorized proceeding with the effluent disinfection project. • Complex hydraulics and construction
<br /> sequencing.
<br /> Summary of Scope
<br /> • Compliance schedule-driven.
<br /> Carollo was selected to provide the engineering planning and
<br /> design services associated with project implementation to achieve The design will be coordinated with other major capital projects at the
<br /> permit compliance by June 30,2030.The new facilities will be WWTP relative to facility siting,power and other utility requirements,
<br /> designed with the flexibility to handle an average,maximum month as well as plant tie-ins.Specific coordination is required for the
<br /> flow of 50-mgd and peak hour flows as high as 122-mgd.System ongoing headworks,pump station,energy savings,solids process
<br /> hydraulics will be a key consideration to effectively integrate the upgrades,miscellaneous improvements,and secondary treatment
<br /> new disinfection system into the existing hydraulic profile of the projects.Constructibility and the sequence of construction activities o
<br /> plant and deep ocean outfall.Sea level rise resulting from climateU) °
<br /> will also need to be carefully evaluated. m z
<br /> change will be a factor in the hydraulic analysis.Improvements < <
<br /> to the existing outfall structure at the plant may be needed. p °
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<br /> Initial planning efforts evaluated alternative disinfection technologies '1 � �- _""'moi— A I
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<br /> and considered how new treatment processes under design and _ �, , r I o
<br /> construction at the plant may affect technology selection.Additional "+ r nr` f F '1.• " w a
<br /> sampling,testing,and laboratory studies are also anticipated. °'°`� '' I r• o k'
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<br /> Carollo is designing the UV disinfection 7Z: 1.7-..-- 7 L •77.-.: `-; i -3. = z
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<br /> system to accommodate a range of I • a:;, D T,
<br /> flows. This requires close coordination Z
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<br /> with ongoing design and construction AC - Z
<br /> projects upstream and downstream of K D
<br /> the new disinfection system. Z
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<br /> CAROLLO/ QUALIFICATIONS /JUNE 2024 12
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