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Mr. Jason Cashman October 27, 2023 Page 2 of 4 The military used the RRI after World War I, and the navy transferred the RRI to the Port in 2000 — 2011 . The Port received Site 47 in 2003. Site 47 is in an industrial area within the southern portion of RRI. Site 47 contains a former model airplane landing strip and skeet / trap shooting range. Most of Site 47 is unpaved. Investigation conducted between 1995 — 2020 found metals (primarily arsenic), polycyclic aromatic hydrocarbons and organochlorine pesticides in the soil and sediment. The RAP was prepared to select a remedy for soil and sediment within Site 47 and adjacent areas on RRI. The remedy would be implemented to support redevelopment of Site 47 for commercial/industrial use. The RAP proposed five remedial alternatives: 1) No Action, 2) Existing Durable Cover, Fence, and Institutional Controls (IC), 3) Existing Durable Cover, Fence, and IC, 4) Excavation (2 feet) with Off-Site Disposal, Cover, and IC, and 5) Expanded Excavation, Consolidation, Cover, and IC). The five remedial alternatives were evaluated and then compared with the nine federal criteria from Environmental Protection Agency guidance to ensure compliance with the nine federal criteria. The RAP recommends Alternative 5 (Expanded Excavation with On-Site Consolidation, Existing Durable Cover, Expanded New Durable Cover, and IC). Alternative 5 is the most effective and viable alternative because it will support a proposed development (called Project Sierra) with near-term economic benefits to the region. Alternative 5 involves installing a durable cover that is integrated with the Project Sierra development, maintaining the cover over time, and establishing ICs to restrict future land use. This will be completed in two phases. During Phase 1, 57,000 cubic yards of contaminated soil will be excavated and consolidated under a new proposed future warehouse. The warehouse will be two feet above the surface to accommodate the consolidated soil. The remaining areas will be covered with either asphalt or concrete. Unpaved areas will be covered with a demarcation layer and two feet of clean soil. The existing and new covers will be inspected and maintained, and future land use and activities will be restricted through a land use covenant.