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FIRM OVERVIEW AND BACKGROUND <br /> * � � � 1" Sand Island Wastewater Treatment <br /> Plant and Sewer Basin Facilities Plan <br /> CITY AND COUNTY OF HONOLULU,ENVIRONMENTAL SERVICES,HONOLULU, HAWAII <br /> Client Reference: <br /> Mr.Wesley Yokoyama,Chief,Wastewater Engineering and Construction <br /> City and County of Honolulu <br /> 808.768.8790 / wyokoyama@honolulu.gov <br /> The City and County of Honolulu's Sand Island Sewer Basin(SISB)is <br /> the largest in the system and extends from Kuliouou at its eastern end Project Highlights <br /> to the Salt Lake/Aliamanu area at its western end.It encompasses • Evaluation of the impacts of climate change, <br /> the downtown and Waikiki urbanized areas and consists of two storm surge,and tsunamis. <br /> primary sub-basins:the Ala Moana(or East Basin)and the Hart Street <br /> • <br /> (or West Basin).Wastewater facilities within the SISB service area Projection of future flows and loads based on <br /> include a network of more than 600 miles of gravity sewer lines recent land use trends. <br /> and force mains,17 wastewater pump stations,and the 90-mgd • Identification of potential regulatory scenarios. <br /> Sand Island Wastewater Treatment Plant(SIWWTP).The Fort Shafter • Detailed collection system evaluation,including <br /> military base effectively adds an 18th pump station to the system <br /> and delivers wastewater from the base directly to the SIWWTP. strategies for reduction in inflow/infiltration, <br /> salinity sources,and system storage. <br /> Summary of Scope • Viability of decentralized treatment given the <br /> Carollo is preparing a comprehensive facilities plan for the SISB with impacts of climate change and sea level rise. <br /> the goal of setting a long-term vision and direction related to the • Evaluation of liquid and solids handling <br /> most cost-effective,reliable,and sustainable strategies for future processes at the SIWWTP and the associated <br /> wastewater collection,treatment,and disposal.Necessary capital ocean outfall. <br /> improvements will be identified through the year 2045. ° <br /> z <br /> D O <br /> Carollo completed a Climate ;, Z <br /> Change Vulnerability Assessment <br /> and Resilience Plan as a part of the <br /> broader SISB Facilities Plan to help SandIsland Wastewater Treatment Plant '' <br /> Zz <br /> and Sewer$osis Facilities Plan =1 z <br /> Honolulu prepare its most populatedazi <br /> Climate Change Vulnerability mm <br /> area for climate change impacts. Assessment and Resilience Planig <br /> FINAL I January 2021 �' z <br /> Ya ° z <br /> azi <br /> G� <br /> ..__. . O <br /> rte;. Z <br /> m <br /> m <br /> P G_ <br /> C) <br /> m <br /> to <br /> mUl <br /> D ? <br /> N <br /> Volume I of 2 c trcfIo <br /> FINAL REPOI1' o <br /> z• <br /> CAROLLO / QUALIFICATIONS / JUNE 2024 11 <br /> \\io-bd-1\BD-DATA\Marketing\Pursuits\CIient831HON1\HawaiiCounty\EnvMgmtDept\On-Call FY24-25\Qua10624\PL.4-CommunityPlanning_Community\Indd\O1_FirmOverview_PL4 <br />