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FIRM OVERVIEW AND BACKGROUND <br /> . 4. r „ <br /> 0 - Hilo Wastewater Treatment Plant <br /> " wls ., Rehabilitation and Replacement Project <br /> A *' - tll „ : COUNTY OF HAWAII,WASTEWATER DIVISION, HILO, HAWAII <br /> m' <br /> Ar . .- - Client Reference: <br /> Mr.Ramzi Mansour,Director,Department of Environmental Management <br /> County of Hawaii <br /> 11` 808.961.8099 / Ramzi.Mansour@hawaiicounty.gov <br /> The Hilo Wastewater Treatment Plant(WWTP)currently serves <br /> portions of the Hilo community and was originally designed for an Project Highlights <br /> overage and peak flow capacity of 5 mgd and 13 mgd,respectively. <br /> • <br /> The last major construction at the plant was completed in 1994;since Detailed 3D Revit design services. <br /> then,relatively minor improvements have been made to the facility. • Fast-track design schedule. <br /> • Permitting and environmental support. <br /> Summary of Scope <br /> • Construction sequencing and <br /> A recent condition assessment and master plan recommended interim milestones. <br /> comprehensive rehabilitation.In addition,the County desires <br /> to increase secondary treatment reliability and provide nutrient • Coordination with on-going WWTP operations. <br /> removal.Carollo provided design services including all required civil, • Coordination with the Department of Health <br /> mechanical,structural,electrical,and instrumentation disciplines. and other agencies. <br /> Permitting assistance and environmental documentation were also <br /> provided.The project includes two phases: <br /> Phase 1 Facilities Carollo identified multiple project <br /> • New headworks and septage receiving facilities. milestones and a series of complex o <br /> • Rehabilitation of the existing primary sedimentation tanks. construction constraints to reduce m z <br /> • New odor control system. risks and maintain plant operations � ° <br /> < D <br /> • Rehabilitation of the existing secondary clarifiers. during construction. AD <br /> N - <br /> • Rehabilitation of the existing disinfection system. I o <br /> mm <br /> To m <br /> • New three-water(3W)pump station. <br /> o <br /> • New blending system with odor control for primary and .., K z <br /> secondary sludge. .+� - 101,1*, _ • C o <br /> a- < m <br /> • New anaerobic sludge digester complex. ,w `< -0 < <br /> "' zo <br /> • New solids handling and warehouse buildings. i y.; <br /> .e <, ' Z m <br /> • Plant-wide electrical improvements including a new standbyro :, <br /> D <br /> generator and a new plant-wide SCADA system. ', „ a Kr 1 K <br /> K <br /> « D <br /> ; c <br /> • Demolition of existing abandoned structures. ', `,<, ' <br /> N' ,'4 • *S _R i ,g-n) <br /> ? D <br /> Phase 2 Facilities • <br /> z z <br /> z— <br /> • New biological nutrient removal(BNR)activated sludge bioreactor z <br /> and new blower building. m m <br /> w <br /> U) U) <br /> • New alkalinity chemical feed system. D o <br /> z D <br /> ■ Electrical improvements including an additional standby generator. <br /> CAROLLO / QUALIFICATIONS /JUNE 2024 4 <br /> \\io-bd-1\BD-DATA\Marketing\Pursuits\CIient83(HON)\HawaiiCounty\EnvMgmtDept\On-Call FY24-25\Qua10624\PL.3-CommunityPlanning_CommPlanAssist\Indd\01_FirmOverview_PL3 <br />