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FIRM OVERVIEW AND BACKGROUND <br /> r. 1 °;' Sand Island Wastewater Treatment <br /> Plant and Sewer Basin Facilities Plan <br /> CITY AND COUNTY OF HONOLULU,ENVIRONMENTAL SERVICES,HONOLULU, HAWAII <br /> y <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. o <br /> improvements will be identified through the year 2045. m °c <br /> mz <br /> < -H <br /> ° ° <br /> Carollo completed a Climate ' ; t <br /> Change Vulnerability Assessment ,� A <br /> and Resilience Plan as a part of the <br /> I <br /> rvi <br /> broader SISB Facitities Plan to help Sand Island Wastewater Treatment Plant 'H <br /> am:1 Sewer$osin Facilities Plonazi <br /> W <br /> n <br /> Honolulu prepare its most populated o <br /> m <br /> Climate Change Vulnerability���� z <br /> area for climate changeimpacts.p acts. Assessment and Resilience Plan �� `'. < ° <br /> FINAL I January 2021 't +' � < <br /> z ° <br /> zz <br /> G� z <br /> nr <br /> r..Mtic D <br /> , D <br /> z <br /> < m <br /> m <br /> m <br /> z <br /> z •- <br /> z <br /> G) T <br /> Om <br /> to m <br /> ww <br /> Volume 1 of 2 cftrrflo ( ° <br /> ANAL.'REPORT Z D <br /> z r <br /> CAROLLO / QUALIFICATIONS / JUNE 2024 11 <br /> \\io-bd-1\BD-DATA\Marketing\Pursuits\Client831HON1\HawaiiCounty\EnvMgmtDept\On-Call FY24-25\Qua10624\PL.3-CommunityPlanning_CommPlanAssist\Indd\O1_FirmOverview_PL3 <br />