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FIRM OVERVIEW AND BACKGROUND <br /> 4. r „ <br /> , lik., . ,,,, <br /> -, „ Hilo Wastewater Treatment Plant <br />- wls. '"` Rehabilitation and Replacement Project <br /> h t _ tll „ : COUNTY OF HAWAII,WASTEWATER DIVISION, HILO, HAWAII <br /> Client Reference: <br /> Mr.Ramzi Mansour,Director,Department of Environmental Management <br /> County of Hawaii <br /> lir 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 0 <br /> • New headworks and septage receiving facilities. c n <br /> milestones and a series of complex Z g <br /> • Rehabilitation of the existing primary sedimentation tanks. construction constraints to reduce -D <br /> r <br /> • New odor control system. risks and maintain plant operations Z ° <br /> z D <br /> • Rehabilitation of the existing secondary clarifiers. during construction. . D <br /> 0_ <br /> I <br /> • Rehabilitation of the existing disinfection system. K <br /> cD <br /> • New three-water(3W)pump station. z z <br /> � <br /> z <br /> • New blending system with odor control for primary and .., m o <br /> G) m <br /> secondary sludge. Awl**, _-ISC • o a <br /> - ^r, T Z T7 <br /> • New anaerobic sludge digester complex. , -u m <br /> t I N►i w ., D z <br /> • New solids handling and warehouse buildings. � °, '' ;+ z <br /> • Plant-wide electrical improvements including a new standby . 'v m o <br /> generator and a new plant-wide SCADA system. ro D <br /> r O <br /> '!'•. m a <br /> Z <br /> • Demolition of existing abandoned structures. `, "" D <br /> „: , r Z m <br /> Phase 2 Facilities <br /> 1, > m <br /> cn <br /> • New biological nutrient removal(BNR)activated sludge bioreactor m <br /> and new blower building. D - <br /> r <br /> • New alkalinity chemical feed system. D <br /> O <br /> • Electrical improvements including an additional standby generator. z A <br /> CAROLLO / QUALIFICATIONS /JUNE 2024 4 <br /> \\io-bd-1\BD-DATA\Marketing\Pursuits\Client831HON)\HawaiiCounty\EnvMgmtDept\On-Call FY24-25\Qua10624\PL.4-CommunityPlanning_Community\Indd\01_FirmOverview_PL4 <br />