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was likely part of an agricultural outlease during ownership by the Navy, but historical records do not indicate that Site 47 was used for productive agricultural purposes. Previous investigations identified soil and sediment contamination beyond the Site 47 boundary (as identified in the Pre-Decisional LUC) to include a paved warehouse area to the west and a portion of the vacant lot to the south. The investigation data from these areas are encompassed by the data set boundary shown in Figure 5. Currently, the habitats identified within the data set boundary include ruderal1 or non-native grassland habitats (that were formerly agricultural grassland areas), urban habitats, drainage ditches, and emergent(and sparse)wetlands on the margins of the drainage ditches (WRA Environmental Consultants [WRA], 2021; Tetra Tech EM, Inc. [TtEMI], 1997). Urban habitat exists on the far west and east sides of the data set boundary and contains pavement, buildings, exposed soil, and formerly landscaped areas. The average present-day land surface elevation at Site 47 ranges from approximately 1.0 foot below to 3.3 feet above mean sea level (msl). 1.4 Site History Formerly a riverine marshy grassland, RRI was transformed into farmland in the late 1800s with the construction of levees and implementation of a drainage system along the perimeter and throughout the interior of the island. Military use of the island started after World War I, when a United States Army camp was established. The island was then developed as a supply depot during World War II and was commissioned as the United States Naval Supply Annex, Stockton, on June 30, 1945. The area was then re-designated as the Naval Communication Station in 1965 following the establishment of their headquarters on the island in 1960. The Navy transferred RRI to the Port through the MARAD in 2000, 2002, 2003, and 2011. 1.5 Site Characterization The Port completed the Site 47 RI/FFS in March 2022. The Site 47 RI/FFS summarized the analytical data and other information collected between 1995 and 2020, and evaluated the risk to human health and the environment for contaminants in soil and sediment. The Site 47 RUFFS also evaluated the remedial alternatives presented in this Site 47 RAP, which encompass a total area of about 83 acres. Remedial investigation activities included: file reviews; aerial photograph analyses; soil and sediment sampling; groundwater sampling; and surface water sampling. The remedial investigations were conducted to identify and characterize contamination present due to historical activities at Site 47. Investigations conducted at and adjacent to Site 47 are summarized in Table 1. Information from soil investigations is presented in Tables 2 and 3, and Figures 6 through 8. Information from sediment investigations is presented in Table 4 and Figure 9. 'Plants(often fast growing weeds)that grow on disturbed land. Site 47 RAP for Soil 3 October 2023