2024-06-29 PL-INT-2024-008115 Element Environmental, LLC Category PL.5

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F. EXAMPLE PROJECTS THAT BEST ILLUSTRATE E2'S QUALIFICATIONS FOR THIS SERVICE CATEGORY(3) 19.TITLE AND LOCATION (City and State) 20.YEAR COMPLETED Phase I and Phase II Environmental Site Assessments PROFESSIONAL SERVICES CONSTRUCTION (If applicable) Mauna Kupu Station,Waianae Mountain Range,Waianae, 2021 and 2022 N/A Oahu,Hawaii 21. PROJECT OWNER'S INFORMATION a.PROJECT OWNER b.POINT OF CONTACT NAME c.POINT OF CONTACT TELEPHONE NO. City and County of Honolulu Ms.Kimberly Ribellia-Collins (808) 524-4200 22.BRIEF DESCRIPTION OF PROJECT AND RELEVANCE TO THIS CONTRACT(Include scope,size,and cost) Project Scope: (2021) Element Environmental, LLC (E2) conducted a Phase I Environmental Site Assessment (ESA) for the 1.113-acre Pacific Missile Range Facility Mauna Kapu Station located near the southern ridgeline of the Waianae Mountain Range on Oahu and designated as Tax . -- Map Key (TMKs): (1) 9-2-049:013 (portion); that consists of Lot 340, Parcel 1, and Easement 110 hereinafter "the Subject Property". The Subject Property was owned by Gill Ewa Lands, LLC at the time of the assessment (City and County of Honolulu [CCH] Department of Planning and Permitting [DPP] 2020a). The Department of the Navy (DoN) leased the Subject Property since 1963 (Naval Facilities Engineering Systems Command [NAVFAC] Pacific 2020). ¢ s The Phase I ESA was conducted in general conformance with ASTM International (ASTM) Practice E 1527-13, Standard Practice for ,° • ," Environmental Site Assessments and All Appropriate Inquiries (AAI), which includes 40 Code of Federal Regulations (CFR) Part 312, Section (§) Project Highlights: 312.21 and §312.31. The purpose of the Phase I ESA was to identify any potential and existing environmental contamination liabilities. F E2 conducted a Phase I ESA and identified RECs for the site.E2 (2022) E2 conducted a Phase II ESA for the same site. The Phase II ESA recommended to further characterize was conducted in general conformance with the State of Hawaii the site. Department of Health (DOH) Hazard Evaluation and Emergency Response (NEER) Office Technical Guidance Manual for the Implementation of the E2 conducted a Phase II ESA for the Hawaii State Contingency Plan (TOM) (DOH NEER Office, 2008 and Navy to end its long-term lease and updates). The purpose was to evaluate the presence/absence and nature return the property to its owner. of contamination in surface and shallow subsurface soils based on Conducted a site investigation for relevant findings of a previous Phase I Environmental Site Assessment contaminants of potential concern in conducted in 2021. The Phase II ESA activities included the collection of surface and shallow subsurface soil surface and shallow subsurface soil samples in identified areas of concern samples. and the completion of a camera survey to verify the existence/location of a cesspool and to evaluate a potential contaminant source associated with Verified the existence and location of a a floor drain in a former generator room. cesspool, and evaluated a potential contaminant source from a floor drain It was found that contaminants of potential concern (COPCs) in a former generator room. concentrations exceeded the DOH Tier 1 (Residential land use) Environmental Action Levels (EALs) for four of the five soil environmental Cost: $41,239. and$78,010. hazards: direct exposure, vapor emissions to indoor air, gross contamination, and leaching to groundwater. Arsenic exceeded the commercial/industrial land use (C/I) and Construction/Trench Worker scenario action levels for direct exposure in the Wooden Antenna Tower. E2 identified several potential contaminant sources. Some sources were resultant from historical activities that no longer occur and can be addressed: weed control using banned pesticides; fueling, operation, and maintenance of diesel-powered generators; operation and maintenance of antennas, antenna equipment, and transformers; construction, maintenance, and alterations to the wooden antenna tower and Former Water Tank; lead in soil from Lead Based Paint(LBP) used on the Former Water Tank and released to soil during demolition. Others are associated with existing site conditions that may continue to negatively impact the Subject Property if they are not addressed first: releases of wood treatment chemicals applied to the wooden antenna tower and cadmium-coated hardware used in its construction; and lead from LBP used on the exterior of Building 204. Five COPCs were found present in ELEMENT ENVIRONMENTAL, LLC COUNTY OF HAWAII, FISCAL YEAR 2025—PAGE 27