PL-INT-2023-005630 06.30.23 ELEMENT ENVIRONMENTAL LLC CAT PL.5

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F. EXAMPLE PROJECTS WHICH BEST ILLUSTRATE FIRM'S QUALIFICATIONS FOR THIS PROJECT CATEGORY 21.TITLE AND LOCATION (City and State) 22.YEAR COMPLETED Wastewater Effluent Reuse Feasibility Study,Waimanalo PROFESSIONAL SERVICES CONSTRUCTION (If applicable) Wastewater Treatment Plant,Waimanalo,Oahu,Hawaii 2014 23. PROJECT OWNER'S INFORMATION a.PROJECT OWNER b.POINT OF CONTACT NAME c.POINT OF CONTACT TELEPHONE NO. City and County of Honolulu Mr.David Nagamine (808) 768-3486 24.BRIEF DESCRIPTION OF PROJECT AND RELEVANCE TO THIS CONTRACT(Include scope,size,and cost) Project Background: The City and County of Project Highlights: Honolulu (CCH), as owner-operator of the E2 completed a market survey Waimanalo Wastewater Treatment Plant . that identified available potable (WWTP) was considering the production of and irrigation water sources; recycled water for reuse by businesses and gauged interest from the public and private entities in the Waimanalo potential users;gathered user community. The Waimanalo WWTP at the - concerns with R-1 water reuse; time provided secondary treatment of 0.5 and identified potential R-1 million gallons per day (MGD) of wastewater generated from Waimanalo water reuse demands. The Town. Wastewater generated in the Waimanalo community was limited to results of the market survey domestic sources and did not include industrial activities. The secondary indicated strong interest in R-1 effluent is filtered using sand filtration, disinfected, and disposed into the water reuse from the several on-site injection wells. The WWTP upgrades in 2008 increased the potential potential users such as the capacity of the WWTP to 1.1 MGD. The design also accounted for future Olomana Golf Club and the upgrades associated with effluent reuse and included an approximate Waimanalo District Park. The footprint and potential connection point for the required addition of an R-1 water reuse demand from ultraviolet (UV) disinfection or equivalent tertiary system. The proposed these potential users was effluent reuse project could reduce the demand for potable water and estimated to be 0.25 MGD or increase the availability of water for additional crop production in approximately 50 percent of the Waimanalo. The State of Hawaii Department of Health (DOH) uses three current average daily flow categories of recycled water, which are based on regulatory definitions, and received at the WWTP. The include R-1, R-2, and R-3 Recycled Water. Hawaii's R-1 recycled water preliminary conceptual design category has the highest recycled water quality standards relative to the was completed and identified other two categories. For R-1 standards to be met, the State required that the required improvements at wastewater effluent be treated by means of oxidation, filtration, and the WWTP,the distribution disinfected to a significant reduction in viral and bacterial pathogens. system improvements, and the Examples of potential reuses include Unrestricted Urban Reuse, Restricted end user improvements. Recreation Reuse, and Agriculture Reuse (Food Crops and Non-Food Crops). Budgetary cost estimates for The State has no restrictions on application rates, operation times, or the improvements and the potential human contact when irrigating with R-1 water (Guidelines for the operation and maintenance of Treatment and Use of Recycled Water, DOH Wastewater Branch, May 15, the treatment system were also 2002). developed. The feasibility study Project Scope: Element Environmental, LLC (E2) conducted a study to determined that Waimanalo assess the technical, environmental, and economic feasibility of wastewater WWTP R-1 water reuse is a effluent reuse in the Waimanalo community. E2 was responsible for the viable option for the CCH to identification of potential users and locations, including the reuse demand, consider in their long-term transmission, and storage requirements. Tasks included public outreach, management of wastewater and data collection, research of prior studies, and evaluation of costs. E2 water resources in Waimanalo. completed a preliminary concept design and cost estimate for the preferred WWTP upgrades to meet the reuse requirements. The concept design also Cost: $219,345. included preliminary layouts of transmission and storage facilities for those users that expressed strong interest in R-1 reuse.The project was prepared for the U.S.Army Corps of Engineers but was co-funded by the CCH Department of Environmental Services. 25.FIRMS INVOLVED WITH THIS PROJECT (1)FIRM NAME (2)FIRM LOCATION (City and State) (3)ROLE a. Element Environmental,LLC Aiea, HI Prime Contractor 00 COUNTY OF HAWAII-FY24- PAGE 28